WUNDA F01pplus Rapid Response Overfloor Boards Installation Guide
- June 11, 2024
- WUNDA
Table of Contents
F01pplus Rapid Response Overflood Boards
Installation Guide
F01pplus Rapid Response Overfloor Boards
Installing Wundatherm Rapid Response® Overflood boards
Overflood boards have a high compressive strength (400kPa) and is fully
approved by Mapei and Ultra for tiling directly onto, using their recommended
flexible adhesives and without the need for a separate backer board or
intermediate layer. Laminate and Wood flooring can also be installed with a
suitable underlay or adhesive onto Overflood boards. Carpet and Vinyl on the
roll will require using our Duo Board or renovation screed as an intermediate
layer.
All Overflood boards and transitional pipe boards have been designed for quick
and simple fitting, easily cut to shape where required or routing out extra
corners/ channels with a suitable bit.
Please note: We always recommend the use of a floor probe where floor
finishes/coverings require floor surface temperatures to be limited – e.g
Natural wood/LVT, please check with the flooring supplier. Wundatherm Rapid Response Overfloor Boards have been tried &
tested in the Thermal Measurement Laboratory at the University of Salford,
Manchester
BS EN 12667 – 2001
Testing for thermal resistance for both 16mm & 20mm boards was carried out to
ISO 8301:1991 / BS EN 12667 – 2001
MEMBERS OF TILE TRADE ASSOCIATION
You will need:
- Either Wunda board spray adhesive & mask
- Or Mapei Ultrabond ECO 380 & A2 spreader
- Work gloves
- Craft knife
- Metal straight edge rule
- Marker pen
- A flat & level structural subfloor
Also recommended:
- Router
- Fine tooth saw
- Knee protection
- Eye protection
- Aluminium tape
- Pipe Layout Drawing*
- Wanda recommended renovation screed (optional)
*Please speak with your account manager & ensure you are happy with the design prior to ordering your system.
Floor preparation
Overfloor boards can be fixed to new or existing concrete/screed or wooden
floors which must be flat, dry, level, stable & structural. Remove any loose
paint or coverings. Floors must be free from oil, grease, damp, dust and
debris or any other substances that will prevent the adhesive from adhering.
When fixing Overfloor boards to a concrete or screed floor, ensure a damp
proof membrane has been installed, if not or unsure, then apply a liquid damp
proof membrane and allow to cure fully before fixing any boards.
When fixing Overfloor boards onto a wooden/timber floor ensure any loose
flooring is secured, replace any missing or damaged boards. Ensure the floor
is firm and level, allow any adhesives to dry fully before fixing Overfloor
boards.
If fixing Overfloor boards to a non-porous substrate such as existing tiles,
they will need thorough cleaning with a de-greasing agent, such as scrubbing
with a combination of methylated spirits and wire wool. Coat the tiles with
Wunda spray adhesive first and then coat the back of the Overfloor boards with
Wunda spray adhesive, allow both to become tacky and then bring the two
surfaces together. (Test a small patch first to ensure compatibility) Please
note: this will half the coverage achieved with Wunda spray.
Fitting perimeter strip
Before laying the floor heating boards, remove skirting boards and any
doors that will require trimming to accommodate the floor heating boards and
final floor finish (2a). Fit perimeter edge strip around the outside edges of
the area to be heated using the sticky tape on the back or a hand staple gun.
This will allow for expansion and help reduce heat loss (2b). Any height
excess can be trimmed off once the final floor finish has been laid & skirting
boards back down to cover. If intending to lay carpets with edge grippers, fix
a suitably sized batten up to same height as the Overfloor boards around the
room perimeter. Lay the Overfloor boards flush against the batten when
installing, this will allow fitment of carpet gripper at a later stage, with
no risk of fixing through panel or pipe. PLEASE NOTE: These boards
are not intended to be bonded to an Asphalt surface. Please call our our
technical support team for advice before commencing work.
Cutting boards
Some cutting of boards will be required, this is easily achieved with a craft
knife or fine toothed saw (3a). Extra pipe channels and routes can be cut by
hand or using an electric router with a 16 or 12mm bit depending on pipe
diameter (3b). Passing pipe through walls
When floor heating pipes need to pass through walls, drill the holes before
laying and fixing boards to prevent any damage to the boards.
Protect and seal the pipe ends with tape. To prevent kinking, one person
should feed the pipe through the hole whilst another draws the pipe through
from the other side, it is a good idea to use pipe conduit to run through
walls (4a).
Study the pipe layout drawing
Before attempting to lay any floor heating boards, familiarise yourself with
the system layout drawing, noting manifold position. The drawing will detail
the orientation and position of boards (5a) Plan the routes for transitional
pipe runs and transitional boards. Some cutting of boards will be required
this is easily achieved with a fine toothed saw or craft knife.
We advise wearing gloves as the aluminium edges can be sharp.
Please note: the pipe layout drawing is optional, please request one
before ordering your system. Preparation & Cutting
Overfloor boards include straight pipe runs, return ends and a transitional
area on every board (6a).
The boards are designed for easy installation, cuttingto shape where required.
Transitional pipe runs additional corners, 90°bends and extra pipe channels
will normally be required and are simply cut from a main board (6b/c) The main
boards should be used in conjunction with Wunda transitional boards in areas
of high pipe concentration. When cutting
and creating new bends into a board, keep the radius gradual and no sharper
than in a main board. The water flow around a pipe circuit should always go to
potential cold areas first, for example external walls and areas of high
glazing. We suggest wearing flat soled shoes or trainers whilst walking on the
boards. Pipe should be set back from walls to limit heat loss into the wall
and to avoid future placement of carpet grippers etc. (6d). Ensure boards are
dry and free from dirt, dust or any other contaminants before laying. Keep any
off-cuts as they may be required later on.
Before laying any boards, familiarise yourself with the system layout drawing
noting direction of boards, potential cutting required and transitional areas.
If you are inexperienced in laying Overfloor boards we strongly suggest
completing a ‘dry’ lay of all boards before using any adhesive. Identify joins
between boards using a marker pen (6e). Once you are satisfied that all boards
have been cut and marked for an area (6f) they can be lifted in preparation of
fixing the boards permanently in place (6g). Fixing wundatherm boards to an existing or new floor
Board spray adhesive method. Ensure subfloor is dry, clean, stable, level and
free from oil, grease, loose paint and any obstructions. Secure any loose
boards, fill any holes, dips or low points in the floor. When using Wunda
spray adhesive users must be aware of the environment in which the spray is to
be applied. The cans need to be at least 16⁰c for the spray to work. If cold
please warm cans prior to use with warm water.
Ensure adequate ventilation, open windows and doors, do not use in confined
areas. Wear suitable protective gloves, face mask and clothing. Prior to use,
check compatibility, spray a small test patch onto the substrate. Some non-
porous floors such as existing tiles will need thorough cleaning with a de-
greasing agent such as scrubbing with a combination of methylated spirits and
wire wool. Apply a coat of spray adhesive to the existing tile surface and the
underside of the Overfloor boards. Allow both surfaces to become tacky before
bringing together (we recommend testing a small patch to test compatibility).
Place the board carefully onto the adhesive, making sure you have selected the
correct board and orientation. Apply an even and firm pressure, make sure the
board is in full contact with the adhesive and floor below.
When using Wunda spray to fix Overfloor boards onto existing floor boards,
both the floor boards and the underside of the Overfloor boards will require a
covering of Wunda spray adhesive. This is necessary as coating both the floor
boards and board will create maximum contact between the two surfaces giving a
firm and secure fixing. As before, always carry out a test area with Wunda
spray and board before commencing with the rest of the installation. This
will half the coverage achieved with Wunda spray.
Transitional areas
Wunda transitional boards (A) are easily cut to suit any Overfloor boards
project where there is a concentration on pipes or where a corner needs to be
formed.
Straight pipe runs can be laid directly into the straight transitional board –
cut to length and width as required (B).
Traditional boards must be bonded to the sub-floor using our recommended
adhesive. Corners can be formed from a transitional board, for example cutting
two opposite 45° will provide a 90° turn (C).
Do not push the 45° cut edges up against each other, leave a gap approximately
120mm wide (C) this will allow the pipe to be formed and bent as it changes
direction from one straight channel to another. Take care not to form to tight
a bend and kink the pipe. The open area between the boards can be back filled
using one of our levelling screeds, either Mapei Ultra Plan Renovation screed
or Ultra Floor Level IT Two, taking care to follow the instruction on the
packets.
Apply and level off at the same height as the Overflood board (D/E).
Alternatively corners can be routed out from a main board once bonded to the
floor.Extra pipe channels can
easily be cut using a suitable router and bit. In order that a smooth bend is
formed, lay and shape the pipe onto the area where the channel is required,
gently bending the pipe to follow a gentle curve. Once the lay of pipe has
been established, follow the curve with a marker pen, marking directly onto
the board the route to be routed (F/G).Using a router
with bit set to 16/12mm depth depending on pipe, gently cut the new channel
following the marker pen layout (H). Ensure the channel is clear and free from
debris, if required the channel can be lined with aluminium tape. Lining with
aluminium tape is not required in areas with highly concentrated/close floor
heating pipes.Where floor heating pipes are
required to pass through walls, suitably sized holes will be required at floor
level using an 18mm drill bit (J). Take care to avoid any services hidden
within the wall, the end of the pipe must be taped off to ensure no debris
enters the pipe before passing through the wall. When passing pipe through the
wall, lift any Overflood boards immediately before the hole, this will make it
easier to pass the pipe through the wall and help prevent any kinks occurring.
The area at entry and exit around the holes may require back filling with
either off cuts of Overfloor boards board or back filled using one of our
levelling screeds either Mapei Ultra Plan Renovation screed or Ultra Floor
Level IT Two, taking care to follow the instruction on the packets. Apply and
level off at the same height as the Overfloor boards. You may wish to use pipe
conduit to protect the outer layer of the pipe when running through walls.
PLEASE NOTE: Spray should be shaken well before use and kept above 16°
for best results. If the spray splatters and comes out uneven, this is due to
being stored in a cold environment – the adhesive should be gently warmed in
warm water before use and periodically during use as the spray can temperature
will gradually cool down.
Bonding boards using Wunda spray adhesive.
Wunda spray adhesive is designed specifically for quick and strong bonding
of Overfloor boards to Concrete, Screed and Wood. Available in 500ml spray
cans and 22ltr canisters for use with our hose and spray gun. 500ml spray cans
will cover up to 5M² when applied to one surface, a 22ltr canister will cover
up to 150M² when applied to one surface and has a 2 year shelf life.
When bonding the boards in place, we suggest starting in a corner and work
along the furthest outside wall first, when you reach the opposite corner
start a new row. Ensure that the pipe channels line up as you lay each board.
A helpful tip is to mark around each board on to the floor with a marker pen
before spraying adhesive. This will allow you to spray the adhesive right up
to the edges minimizing overspray and wastage (7a).
Spray should be shaken well before use and kept above 16° for best results, if
the spray splatters and comes out uneven this is due to being stored in a cold
environment and the adhesive should be gently warmed in warm water before use
and periodically during use as the spray can temperature will gradually cool
down.
Spray at a distance of 10-20cm (4-8”) towards the substrate surface, applying
a uniform and even coat of adhesive and obtain 80-100% coverage (7b). Do not
over apply the spray, overlap each pass of spray so as to create an even coat
of adhesive. Release the spray at the end of each sweep so as to avoid puddles
of adhesive – a good tip is to watch our online video ‘Installing Overfloor
boards with Wunda Spray Adhesive’. Allow the adhesive to tack off until no
adhesive transfers to the knuckle when touched (7c) then position the board
onto the adhesive, pressing down firmly to good contact with the adhesive
(7d). Avoid over applying spray adhesive, as this is not necessary and will
result in poor coverage results. Some subfloors may require a coat of adhesive
to the subfloor and a perimeter coat around the underside of the Overfloor
boards (please note: this will reduce coverage).
Always perform a small test area before commencing full installation and spray
use.
Important: When bonding onto older floor boards
Make sure your existing floorboards are flat and in good condition.
Please replace any old boards and fix loose ones and ensure any screw or nail
heads are below the surface of the wood. NOTE: If using the 500ml spray can, the nozzle can be set to
one of three positions – LOW, MEDIUM & HIGH, as indicated L, M, H on the
raised area below the nozzle. we recommend setting the spray pattern between M
& H.
As an alternative to using Wunda spray adhesive, Mapei Ultrabond ECO 380 is
approved. With a strong bond of Overfloor boards to all kinds of absorbent,
stable, level substrates including concrete/screed and existing wooden floors,
which must be must be flat, dry, level, stable & structural. Floors must be
free from oil, grease, damp, paint and debris or any other substances that
will prevent the adhesive from bonding to the floor. ECO 380 must be allowed
to fully cure before any foot traffic or laying floor heating pipes. Starting
with a few square meters at a time apply Mapei Ultrabond ECO 380 to the
substrate using a 2mm (A2) tooth comb spreader (8a). Do not use Mapei
Ultrabond ECO 380 as a filler to level out gaps, cracks or uneven substrates
as this will greatly reduce the coverage achieved and increase drying times,
plus effecting the ability to bond properly. Any uneven screed or concrete
floors should be levelled with a renovation screed first. Mapei recommend
Ultraplan Renovation Screed for this.
Leave the Mapei Ultrabond ECO 380 to become tacky before laying any boards –
generally 10-30 minutes dependant on the substrate, environment conditions and
temperature.
The boards can now be applied to the adhesive, starting with one board at a
time, usually the furthest corner of the room (8b). Systematically work across
the outside wall fixing each board in turn (8c). When you reach the opposite
side of the room return to the beginning and start the next row, ensuring that
pipe channels line up. A good tip is to insert
a small off cut of pipe into the pipe channel where the boards meet (8d).
After laying each board, carefully walk on the board applying adequate and
even pressure, ensuring the board has taken to the adhesive. Take care as
boards may slip on the adhesive, if any boards squeak when walked on,
carefully lift the board, re-apply adhesive and repeat the above steps (8a-
8d). Allow sufficient time for the Mapei Ultrabond ECO 380 to fully dry before
allowing any foot traffic as boards may slip and move (generally 24-48 hours
drying dependant on the substrate, environment conditions and temperature).
Installing floor heating pipe into Wundatherm boards Before laying pipe
make sure all pipe channels are clear from debris, check and familiarize
yourself with the pipe layout drawing (9a), plan where to begin and the pipe
routes for each individual loop of pipe.
The layout drawing will indicate the length of each pipe loop required. Do not
cut the pipe before laying as you may need to change the route due to
unforeseen circumstances. Wunda Pert/Al/Pert pipe is recommended for use in
all Overfloor boards systems due to it’s flexible, lightweight and easy to
handle properties. Always begin laying pipe at the manifold, allowing a bit
extra for final connection to the manifold, identify each loop flow, return
and loop number and loop length using a permanent marker (9b).
If not using a pipe decoiler the pipe can be easily installed by two people,
the first walks with the pipe coil and reels it out while the second person
carefully walks along the pipe pushing the pipe down into the straight pipe
channel (9c – 9d).If laying pipe without
the aid of a pipe de-coiler, when you reach the end of a straight run, employ
the technique of rotating the whole coil through 180° towards the direction of
the return channel (9d/e) This will help
deter the pipe from trying to twist and keep tension pointing downwards, ease
the pipe around and into the bend. Lay the pipe into the return or corner,
gently forming and pushing the pipe into the channel as it works around the
bend (9d/e).
Do not try and form the bend before laying the pipe as this could potentially
result in a kink in the pipe. If a kink occurs, wrap the pipe in a warm wet
cloth for protection and gently squeeze with pliers to re-shape. Alternatively
the pipe can be lifted out of the boards and moved backwards so the kinked
section now lays in a straight channel.
Once all pipe has been laid into the boards, ensure each loop has been
identified with flow, return and loop number (9b). This will help eliminate
mistakes when connecting the pipe to the manifold at a later stage. Protect
your newly laid floor heating system from site traffic by covering with boards
where walking is necessary prior to installation of final floor finish.
If pipe work is not installed correctly, it may sit proud of the Overfloor
board, it can be tapped down using a wooden batten across the board and gently
tapped with a hammer (9f) or aluminium tape can be used to secure the
pipe. TIP:
In the unlikely event of a kink in the pipe occurring, wrap the pipe in a warm
wet cloth for protection and gently squeeze with pliers to re-shape. Be
careful not to over work it and kink the other way. Pressure test as normal
but investigate the kinked area prior to covering.
Overflood board
Flooring with wood products (Inc. Parquet, Solid and Laminate)
For floating Wooden and Laminate floors it is advisable to use Wunda XPS
Underlay, allowing the floor to move freely when expanding and contracting and
to help improve step noise reduction.
Wood is a material that is extremely influenced by its environment,
specifically by moisture content of the air above and below. Depending on the
relative humidity of the air, moisture content of the wood will naturally vary
over the seasons – and so will its volume. Floor heating will escalate the
expansion and contraction of wood. It is therefore extremely important to
install wood flooring with care, following the manufacturers guidelines.
Flooring manufacturers often give instructions on how wood flooring should be
laid, with a maximum surface temperature of 27°C. This can be monitored and
set using a Wunda thermostat and floor probe which will protect the floor.
The easiest means of installing wooden flooring is by the ‘floating floor’
method, special attention must be taken to follow manufactures instructions on
expansion joints. With Floor heating, wood will dry and shrink more during the
winter season than if floor heating was not installed.
Generally for wood floating floors, it is important to have some form of
vapour barrier underneath.
Some wood flooring manufactures require a polythene vapour barrier (0.2mm
thick and age tested) to prevent vapour moisture potentially coming from below
which could damage the wood flooring.
It is important for wood flooring which has been kept in cold conditions to be
taken into the room in which it will be fitted, so that it can acclimatize to
the new environment and this may take several weeks. Some large wood products
(unless kiln dried) may need a longer acclimatization period in order to dry
to a sufficiently low moisture content before it can be fixed.
Again, check with your flooring supplier for the best practise.
Please note:
Maple and Beech woods are not suitable with underfloor heating due to
potentially large seasonal movements of contraction and expansion in the woods
causing splitting.
How the Overfloor board works with your chosen flooring Please note:
When designing the UFH system try and keep grain of wood going at 90 degrees
to the direction of the pipe to avoid the pipe running parallel with wood
joins.
General recommendations for installing wood flooring
Flooring manufacturers give instructions on how wood flooring should be laid,
and make reference to floor surface temperatures not exceeding 27°C . Wunda
always recommends the use of thermostats with floor probes to limit floor
surface temperatures. The maximum resistance of all floor coverings should not
exceed 2 tog. or 0.2 m² K/W
Install the wood flooring on top of a suitable underlay, remembering to leave
adequate space at the expansion joints for the wood to expand and contract
over the seasons, usually the space is made available along adjacent walls so
that the space will be covered by skirting boards on the wall.
Parquet
Parquet should be installed according to suppliers instructions. Parquets of a
laminated type (three layers) give smaller expansion and contraction over the
seasons. Solid parquets have larger moisture movements than laminated
parquets. With small form factor blocks, we recommend a renovation screed as
an intermediate layer, either Mapei or Ultra (Premium+ Boards only, see pg 10
& 11).
Solid wood (floorboards)
Solid floorboards should be placed so that the direction of the grain is at 90
degrees to the direction of the pipe. If the floorboards are to be fixed
rather than a floating floor, suitable advice should be available from your
supplier, however fixing with an acrylic adhesive will allow for expansion and
contraction of floorboards over the system.
Laminate
Laminates are usually quite thin (7 – 10mm), which from an energy perspective
are more efficient than other thicker wood floorings. They should either be
glued or ‘clicked’ together according to the manufacturers instructions.
Several laminates are delivered with a vapour barrier and/or an acoustic layer
attached to the bottom.
Carpet
If intending to lay carpets with edge grippers, fix a suitable sized batten
around the perimeter of the room up to the same height as the Overfloor board,
this will allow fitment of carpet gripper at a later stage. Carpet will
require a flat surface, you can use our duoboard system (see factsheet U04) No
more than 2 tog 0.2m² K/W of resistance for underlay and carpet when using Duo
Board. For Renovation Screed as an intermediate layer (for EPS 400 Overfloor
board (400kPa) only) gives 2.5 tog 0.25m² K/ W resistance for carpet &
underlay combined.
Alternatively: Prime the aluminium and exposed floor heating pipes of the
EPS 400 Overfloor board (400kPa) boards with MAPEI ECO-PRIM GRIP and once dry
a minimum 5mm depth of MAPEI ULTRAPLAN RENOVATION SCREED to form a solid and
level surface for the carpet. Or, prime with ULTRA PRIME IT, followed by 5mm
of LEVEL IT 2.
Kandan, Amico, Cork Planks
Prime the aluminium and exposed floor heating pipes of the EPS 400 Overflood
board (400kPa) boards with MAPEI ECO-PRIM GRIP and once dry a minimum 5mm
depth of MAPEI ULTRAPLAN RENOVATION SCREED to form a solid and level surface
for your final floor finish. Or, prime with ULTRA PRIME IT, followed by 5mm of
LEVEL IT 2. Please see pages 10 & 11 for full instructions on using Ultra
products. Installation guide for using
Ultra products with Rapid Response® (400kPa) Overflood Heating Boards
Wundatherm Overfloor Heating Boards are a range of underfloor heating systems
with pre-cut channels that house warm water pipes and are suitable for use
over a variety of existing floors. The range consists of boards made from
expanded polystyrene (EPS) of low, medium and high density.
The more dense the board the greater its strength and insulating properties.
Only EPS 400 Overfloor board (400kPa) is suitable for renovation
screed/heavier floor finishes.
The upper surface of the boards have a bonded layer of aluminium foil to aid
dispersion of the heat rapidly across the floor. Please see separate
information for installing Carpet, Vinyl & Linoleum Sheet, Solid Wood
(Floorboards), Parquet, Laminate Flooring direct to our overflood board or in
combination with Wanda Duo-Boards as specified.
The following guidance is specific to using Ins tarmac Ultralow & UltraTilefix
materials with Wundatherm Premium+ High Density Board.
- Installing Ceramic, Porcelain, Quarry & Natural Stone Tiles.
- Installing Carpet Tiles, LVT, Vinyl Tiles & Planks
PREPARATION
Once the warm water pipes have been fitted to the EPS 400 Overfloor board (400kPa), the following criteria must be checked and assured before continuing:
-
Ensure that the EPS 400 Overfloor board (400kPa) are secured to the substrate and that there is no movement in the boards. It is essential to the performance of any cementitious products, to be installed, that the boards are solid and stable in position and firmly fixed. Movement of the boards will need to be rectified before continuing as this may lead to cracking or debonding of the next course of materials.
-
It is essential that the under floor heating is pressure tested to ensure no leaks are evident in the pipework and the system is working as required. Once confirmed, the heating should remain switched off for the duration of the flooring installation.
-
Under no circumstances should the floor heating be used to aid the drying of any cementitious levelling or adhesive compounds to be used. Force drying in this way is likely to affect the hydration process of the cement, reducing its strength and overall performance.
-
Any pipes rising out of the channels should be firmly reset. All pipes need to be firmly fixed into the board channels before continuing.
-
Once steps 1 to 4 are completed, it is essential that any unused channels
bridged with foil should be broken through and the foil edges pressed firmly into the walls of the channels. This is to prevent unsupported weak spots in the finished flooring being susceptible to point loading. -
Vacuum the complete surface ensuring all debris has been removed from the boards, pipes and broken through channels.
-
Once clean, we recommend priming the entire surface with a neat application of UltraFloor Prime it MSP. Would recommend the use of a paintbrush to coat the pipes and empty channels thoroughly, followed by a roller to coat the board across the entire foil surface. Avoid thick sections or pooling of primer in channels and around pipes that will only serve to delay drying.
-
Ensure the primer is fully dry before continuing; typically, this is within 2 hours but is dependent on temperature conditions and application thickness. It is essential that all exposed surface including unused channels and pipes are primed thoroughly and are dry before continuing.
Tiling to EPS 400 Overfloor boards (400kPa) (Ceramic, Porcelain, Quarry,
Natural Stone)
Option 1. (Minimum tile size 10cm x 10cm)
a. Use a straight sided trowel to apply UltraTilefix ProFlex S2 tile adhesive
to the prepared boards to fill in the unused channels (see note 5) or any deep
sections cut outs in the boards.
b. Whilst still wet apply the same adhesive using a rounded notch floor trowel
to suit the installation, over the complete surface. Bed tiles immediately.
Pressure applied to the tile should be sufficient to create 100% contact of
the adhesive with the back of the tile.
c. Ensure that if using large format tiles (tile with at least one side 300mm
or greater) that the back of the tile is also back buttered with the adhesive
to ensure there is 100% contact creating a secure bond.
d. Once cured (24 – 48hrs dependent on conditions) use UltraTilefix Pro Grout
Flexible to grout the joint to complete the installation.
e. On completion of installation of tiles and after grouting has cured hard,
the floor should remain at ambient temperature for a minimum of 7 days with
the underfloor heating pipes switched off. After this period, the water
heating temperature is increased gradually to reach working temperature
slowly. A maximum rate of temperature increase would 5⁰C per day is
recommended. Failure to follow this instruction could damage the installation.
Option 2. (All tile sizes)
a. Apply Ultralow Level it Two to the prepared boards ensuring a minimum depth
of 5mm above the top of the heating pipes. To ensure maximum flow properties
ensure the leveler is mixed for 3 minutes before pouring.
b. Ensure all unused channels & pipe sections are filled with the compound
initially.
c. Allow the leveller to cure for 48 hrs before considering tiling over.
d When cured apply UltraTilefix Prolix S2 tile adhesive to the leveler using a
rounded notch floor trowel to suit the installation. Bed tiles immediately.
Pressure applied to the tile should be sufficient to create 100% contact of
the adhesive with the back of the tile.
d. Ensure that if using large format tiles (tile with at least one side 300mm
or greater) that the back of the tile is also back buttered with the adhesive
to ensure there is 100% contact creating a secure bond.
e. Once cured (24 – 48hrs dependent on conditions) use UltraTilefix Prorupt
Flexible to grout the joint to complete the installation.
NB: If installing Option 2 in a bathroom, shower room or wet room area then it
is advisable to include a waterproofing s stem between stages (c) and (d).
Ultra Tile Fix Proceed
Tanking Kit can be used provide waterproofing p otection, dependent on the
floor desi n.
f. On completion of installation of tiles and after grouting has cured hard,
the floor should remain at ambient temperature for a minimum of 7 days with
the underfloor heating pipes switched off. After this period, the water
heating temperature is increased gradually to reach working temperature
slowly. A maximum rate of temperature increase would 5⁰C per day is
recommended. Failure to follow this instruction could damage the installation.
Preparing EPS 400 Overfloor boards (400kPa) before laying Carpet Tiles,
LVT, Vinyl Tile & Planks
a. Apply UltraFloor Level it Two to the prepared boards ensuring a minimum
depth of 5mm above the top of the heating pipes. To ensure maximum flow
properties ensure the leveller is mixed for 3 minutes before pouring.
b. Ensure all unused channels & pipe sections are filled with the compound
initially.
c. Allow the leveller to cure for 48 hrs before considering installing floor
covering.
d. Install floor covering as per manufacturer’s recommendations.
e. On completion of installation of the final floor covering, the floor should
remain at ambient temperature for a minimum of 7 days with the underfloor
heating pipes switched off. After this period, the water heating temperature
is increased gradually to reach working temperature slowly. A maximum rate of
temperature increase would 5°
C per day is recommended. Failure to follow this instruction could damage the
installation.
Precautions:
-
Prior to installing EPS 400 Overfloor boards (400kPa), the floor should be level, in order that the boards sit flat and are fully supported. This will also ensure 100% contact of the board into adhesive.
Any uneven areas need to levelled before starting. -
Whether pre-levelling the existing floor or applying board adhesive direct, all dirt, debris, grease or contamination should be removed thoroughly and the complete floor area vacuumed to ensure clean and dust free. Do not sweep using brush or broom, this will only serve to spread the dust.
-
Any loose or flaking floor paint, should be mechanically scarified to remove.
-
If moisture exists in the original screed then this needs to be rectified before installation of the Wundatherm System. Please see potential use of UltraFloor DPM IT Rapid Cure.
EPS 400 overfloor board & Mapei guide for tiling using Mapei adhesives
In all circumstances the board must have been installed correctly and provide
a sound, stable substrate.
Additionally it must be clean and free from contamination or substances which
could inhibit adhesion. To reduce consumption of Renovation Screed/Tile
Adhesives, it is advised that any unused pipe channels are covered/filled with
e.g. left over pipe and any gaps taped over.
Installing ceramic, vitrified, quarry and porcelain tiles
- Bond tiles directly to the EPS 400 Overfloor boards (400kPa) with MAPEI KERABOND T & ISOLASTIC (100%) or MAPEI KERAQUICK S1 & LATEX PLUS
Option 2
- Prime the EPS 400 Overfloor boards (400kPa) with MAPEI ECO PRIM GRIP.
- Level with a minimum 5mm MAPEI ULTRAPLAN RENOVATION SCREED*
- Bond tiles using MAPEI KERABOND T & MAPEI ISOLASTIC (100%) or MAPEI KERAQUICK S1 & LATEX PLUS
Installing natural stone tiles
Option 1
- Prime the aluminium surface with MAPEI ECO PRIM GRIP
- Level with min. 5mm MAPEI ULTRAPLAN RENOVATION SCREED*
- Bond tiles using MAPEI KERABOND T & MAPEI ISOLASTIC (100%) or MAPEI ELASTORAPID or MAPEI GRANIRAPID or MAPEI KERAQUICK S1 & LATEX PLUS
Installing ceramic, porcelain & natural stone tiles in a wet room
STAGE 1
Option 1
- Prime the aluminium surface with MAPEI ECO PRIM GRIP
- Level with min. 5mm MAPEI ULTRAPLAN RENOVATION SCREED*
STAGE 2
- Apply MAPEI MAPELASTIC AQUADEFENCE/MAPEI MAPEBAND
Fix Tiles
- Bond the tiles with MAPEI KERABOND T & MAPEI ISOLASTIC (100%) or MAPEI ELASTORAPID or MAPEI KERAQUICK S1 & LATEX PLUS
Under NO circumstances should the floor heating be used to aid or speed up the
drying of any floor heating board adhesives or tile adhesives including grout.
When heating the system for the first tim , ensure any heat is introduced
gradually to protect the fl or from thermal shock.
Mapei products overview
Ultrabond Eco 380
Ultrabond Eco 380 is an adhesive with a quick and strong bond of wundatherm
boards to all kinds of absorbent and stable substrates used in the building
industry including screed/concrete and existing floorboards Ultraclean
Renovation Screed – to provide a level surface to accept floor tile.
Ultraclean Renovation Screed is a fibred reinforced self levelling compound
suitable for applying onto Wunda Overfloor boards after first priming the
Overfloor
Board with Mapei Eco Prim Grip.
A minimum 5mm screed is required
- Do not introduce any heat into the pipe circuit until renovation screed has fully cured. Ultrabond Eco S955 1K
Ultrabond Eco S955 1K is used for bonding a ply deck or bonded wood finish directly on to Wundatherm boards. Kerabond T and Isolastic
Kera bond T and Isoelastic is a two part mix (Ratio 100 : 33, Kera bond : Isoelastic) used to bond tiles directly to Wundatherm boards (used for laying of ceramic, vitrified, quarry and porcelain tiles). Drying time – allow 7 days before introducing heat gradually. Keraquick S1 and Latex Plus
is a two part mix (Ratio 100 : 100, Keraquick S1 : Latex Plus) used to bond tiles directly to wundatherm boards (used for laying of ceramic, vitrified, quarry and porcelain tiles). Drying time – allow 24 hours before introducing heat gradually. Keraquick S1 and Latex Plus Mapei Aquadefence and Mapeband
Mapei Aquadefence is a ready to use, flexible, ultra rapid drying waterproofing membrane for use in wet rooms. Mapeband is an Alkali-resistant rubber tape with textile backing/edges for the flexible waterproofing of edges and expansion joints. Used with MAPELASTIC AQUADEFENSE.
Technical Information
Rapid Response® Overfloor Boards | 20mm | 16mm |
---|---|---|
Length | 1200mm | 1200mm |
Width | 600mm | 600mm |
EPS Density | 116 kg/m³ | 110.2 kg/m³ |
Compressive Strength | 400 kPa | 400 kPa |
Board weight | 1.59 kg | 1.33 kg/m³ |
External Diameter of Pipe | 16mm | 12mm |
Thermal Resistance | 0.447 m2 k/w +/- 2.5% | 0.379 m2 k/w +/- 2.8% |
Please note: Advised maximum lengths for individual pipe circuits is 100
linear metres for 16mm pipe and 60 linear metres for 12mm pipe.
Important Information
The heat output of this underfloor heating system must be limited to a maximum
supply water temperature of 45° C and a maximum floor surface temperature of
27°C
for wooden floors. Underfloor heating cannot compensate for large heat losses
of an inadequately insulated house. Please note that underfloor heating
systems can give an approximate heat output of 96.5W/m² with ceramic and stone
tile coverings and 65.3W/ m² with wooden coverings (up to 16mm thick) and
51.5W/m2 with carpet.
Outputs in line with BSEN 1264
“When mixed floor solutions are being served from the same manifold, a floor
probe must be used in the floor solution with the lower maximum supply
temperature. This is
to limit the temperature in these floor areas and prevent damage to the floor
solution and/or floor finish.”
Please check our website for tech support videosE&OE – Wunda regularly
review all factsheets and try to ensure all information is correct at point of
publishing. Please ensure you are using the latest version available on our
website. Wunda accept no liability for any incorrect or incomplete
information.
Tech support opening hours are subject to change – please visit our website
for the latest information
✆ 0800 5420 816
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