GreenStuf Thermal Ceiling and Wall Insulation Instructions
- June 13, 2024
- GreenStuf
Table of Contents
www.greenstuf.co.nz
INSTALL INSTRUCTIONS GreenStuf®
Thermal Ceiling & Wall Insulation
THERMAL CEILING AND WALL INSULATION
The total R-Value of the building system depends on the building materials,
design and installation and may be less than, greater than or equal to the
R-Value of this product. GreenStuf® polyester insulation products have an
indefinite life and carry a 50 Year Product Durability Warranty.
The initial performance of this product may be reduced if it is stored for too
long in its compressed packaging.
Should this product be found to be compressed at installation, it will recover
to its nominal thickness and R-Value between 72 hours and one month following
installation, depending on the environmental conditions.
GreenStuf will not settle or reduce its performance over time and if installed
in accordance with these manufacturer’s instructions, it will meet the 50 year
durability clause of the NZBC (B2.3.1(a)).
SAFETY INSTRUCTIONS
GreenStuf 100% polyester insulation is completely safe and user-friendly and
no protective clothing, specialist equipment or precautions are required to
handle or install this product. GreenStuf is non-irritant, non-toxic, and non-
allergenic and therefore there will be no skin, throat or lung irritation on
contact or following installation.
CAUTION: Electric cables and equipment partially or completely surrounded
with any bulk thermal insulation may overheat and fail. This applies to wiring
installed prior to 1989. Please follow these installation instructions.
INSTALLATION TOOLS
For retrofitting insulation, we recommend you have the following: step ladder, lamp and extension cord or torch, sharp scissors or wide blade snap/disposable knife, installing stick – such as a broom handle – used for pushing the insulation into corners and hard to reach places in the ceiling.
INSTALLATION INSTRUCTIONS
We recommend all thermal and acoustic insulation is installed in accordance
with NZS 4246:2016 Energy Efficiency – Installing bulk thermal insulation in
residential buildings. Copies of this Standard are available from Standards
New Zealand.
Cutting to size – always cut GreenStuf slightly oversized to ensure a
tight friction fit. GreenStuf rolls can easily be torn across the width by
hand. GreenStuf can be cut down the length of the Pad/Roll using an insulation
saw, sharp scissors or by compressing the insulation under a timber off-cut
and then cutting through with a sharp wide blade disposable knife. Heavier and
higher density products can be cut using an ‘insulation knife’ or insulation
saw.
Insulate all areas of the wall and ceiling leaving no gaps. Off-cuts can be
used to fill small spaces. Even small gaps will significantly reduce the
overall thermal efficiency of the construction system. Do not compress
insulation unless this is a design specification as this will affect the
thermal performance.
Walls: GreenStuf Roll Form product thicknesses vary with R-Value. Before
you begin ensure you have the correct insulation to fit inside the wall
cavity. GreenStuf should be friction fitted inside the timber framing ensuring
no gaps. All of the wall space in exterior walls should be insulated (i.e.
from the top to the bottom plates).
With a drained cavity wall construction and stud spacings greater than 450mm,
NZBC E2/AS1, 9.1.8.5 Wall Framing behind Cavities, requires stud straps to
prevent insulation bulging into the cavity. Straps must be run at 300mm
centres over the wall underlay.
When retrofitting in exterior walls (without wall underlay) with direct-fixed
claddings, use semi-rigid insulation that is at least 20mm thinner than the
framing (e.g. for walls with 90mm framing, the insulation shall be no thicker
than 70mm).
Ceilings: GreenStuf should be friction fitted between the ceiling joists
and over ceiling battens where possible, or laid at right angles over the
ceiling joists ensuring no gaps. All of the ceiling area should be covered
with nsulation (i.e. to the top plates of the exterior walls) except around
heating flues, non-CA/IC rated recessed lights and non-ducted extractor fans.
Start the installation at the furthermost point from the ceiling manhole. Use
the ‘installing stick’ to push the insulation into harder to reach places.
Ensure a 25mm ventilation gap between the roofing underlay and the insulation
is maintained at all times.
A minimum gap of 100mm must be left around un-rated recessed down lights and
200mm around unducted vents ceiling, do not cover ceiling vents – simply
insulate around them. Ensure a 75mm gap is left around metal heating flues and
50mm for brick/concrete chimneys.
Where possible, insulation should be placed beneath electrical wiring to allow
access for maintenance and to prevent possible over-heating.
Double-Layer Ceiling Installation: For higher R-Value installations we
recommend a ‘double-layer’ installation to reduce thermal bridging and heat-
loss through the timber construction. When using double-layer insulation in
trussed roof ceilings, lay the first layer between the ceiling joists and over
the ceiling battens, and the second layer at right-angles to, and over the top
leaving no gaps except around heating flues, chimneys, non CA/IC rated
recessed light fittings and non-ducted extractor fans as detailed previously.
A raised heel is recommended to allow space for insulation over the top plate.
Ensure there is a 25mm ventilation gap between the roofing underlay and the
insulation.
When using double-layer insulation in purlin and skillion roofs, lay the
second layer in the same direction as the first layer. Ensure that there is a
25mm ventilation gap between the roofing underlay and the insulation, or a
ventilated cavity between the roofing and the roof underlay.
This pack complies with AS/NZS 4859.1 at the nominal weight, net area and
nominal thickness recorded on the bale label.
ILLUSTRATIONS OF CEILING INSULATION BLANKET INSTALLATION
Skillion Roof
Trussed Roof
Roof with Steel Purlins The brand names and logos mentioned herein are
registered or unregistered trademarks either owned or used under license by
Autex Industries Limited or other members of the Autex Group.
The contents of this document are protected by Copyright 2020 Autex Industries
Ltd. All Rights Reserved.
It is the user’s responsibility to determine if the product and information
presented in this document is suitable for the intended application by
engaging a suitably qualifi ed consultant. The information contained in this
document is correct to the best of our knowledge at the date of its
publication. To verify that this document is the most current publication
please check our website or contact your GreenStuf® account manager.
GS_NZ_THP_II_Thermal Insulation_Aug22_CT
AN ISO 9001 AND ISO 14001 CERTIFIED COMPANY
GreenStuf® Factory and Collections 40
Westpoint Drive, Hobsonville, Auckland 0618, New Zealand
Freephone 0800 428 839
Phone +64 9 828 9179
Fax +64 9 828 5810
www.greenstuf.co.nz