Technical Data Sheet

Ventilated Facade Insulation

1st November 2023

ROCKWOOL
Rainscreen
Non-combustible insulation for
Ventilated facades

ROCKWOOL Rainscreen is a stone wool insulation developed

specifically for use within ventilated cladding systems.

ROCKWOOL Rainscreen is non-combustible – it does not develop toxic

smoke nor promote flame spread, even when directly exposed to fire. It
also contributes to a building’s energy efficiency with its reliable
thermal performance. It is moisture repellent, allowing the structure to
maintain breathability and dryness. The superior performances of
ROCKWOOL Rainscreen ensure that its insulation value can be
maintained for a long time.
Fire Performance
Compatible with numerous cladding attachment systems, the product The non-combustible
can be easily fitted around brackets and other awkward details. When
characteristics of ROCKWOOL
tightly butted, adjacent slabs effectively 'knit' together to provide a
Rainscreen insulation means that
continuous insulating layer, reducing heat loss that would otherwise be
caused by gaps. it will not develop toxic smoke or
promote flame spread even
when directly exposed to fire.

For more information at www.rockwool.com/anz

ROCKWOOL
Technical Data Sheet
Ventilated Facade Insulation
1st November 2023

Rainscreen
Technical Parameters
ROCKWOOL ROCKWOOL
Product Name Test Standard
Rainscreen SL950 Rainscreen SL960

Non-combustible Non-combustible AS 1530.1

Reaction to Fire
Euroclass A1 Euroclass A1 EN 13501-1

Ignitibility: 0 Ignitibility: 0
Fire Hazard Spread of flame: 0 Spread of flame: 0
AS 1530.3
Properties Heat evolved: 0 Heat evolved: 0
Smoke developed: 0-1 Smoke developed: 0-1

Melting Point 1000°C 1000°C ASTM E794

Thermal Conductivity
0.035 W/mK 0.034 W/mK ASTM C518
at mean 23°C

Water Absorption
0.5 kg/m² 0.5 kg/m² BS EN ISO 29767
(partial immersion)

Water Vapor Less than Less than ASTM C1104/

Absorption 0.04 Vol % 0.04 Vol % 1104M

Water Repellent 99 % 99 % GB/T 10299

Application
ROCKWOOL Rainscreen is suitable for use on the following construction types:
 Steel frame, timber frame or masonry walls in conjunction with a cladding system
 Steel frame or timber frame with a masonry outer leaf

Compliance with the Australia NCC

The above range of ROCKWOOL products, when properly specified and installed, demonstrates the following compliance:
 Thermal
Complies with AS/NZS 4859.1 and meets the requirements of NCC through adherence to NCC 2022 Volume 1 Section
J4D3 (1), NCC 2019 Volume 1 Section J1.2(a), NCC 2019 Volume 2 Section 3.12.1.1(a) and state-prescribed variations.

 Fire Hazard Properties

Adheres to NCC 2019 Volume 1 Specification C1.10 Clause 7 and NCC 2022 Specification 7 Clause S7C7 for insulation
materials. When tested to AS1530.3, these products conforms to the "Spread of Flame" and "Smoke Developed"
requirements outlined in NCC 2022 Specification 7 Clause S7C7 and NCC 2019 Volume 1 Specification C1.10 Clause 7.

 Non-Combustibility
Complies with the non-combustibility standards of NCC 2022 Volume 1 C2D2 and NCC 2019 Volume 1 C1.9(a) or
satisfies the testing criteria outlined in AS 1530.1.

Facings
ROCKWOOL Rainscreen series is available as plain products and additionally with options of foil facing or glass tissue on one
side or two-sided.

Packaging and Storage

ROCKWOOL Rainscreen is shrink-wrapped in polyethylene sheets for ease of handling, transportation and storage. Products
should be stored in doors or under waterproof covering.

Health & Safety

ROCKWOOL stone wool products are manufactured from FBS-1 stone wool. FBS-1 stone wool is safe to use
and the fibre component of these products is listed by Safe Work Australia as Man-made Vitreous Fibre (stone wool) of low bio
persistence as specified under Note Q in the Australian Hazardous Substances Information System and in the Australian
Approved Criteria.

For more information at www.rockwool.com/anz

ROCKWOOL
Technical Data Sheet
Ventilated Facade Insulation
1st November 2023

Rainscreen
Water resistance
ROCKWOOL stone wool insulation repels liquid water due to its fibre orientation and the presence of water-repellent
additives.

Condensation control
The vapour resistivity of ROCKWOOL stone wool is 5.9MNs/gm. The slabs therefore reduce the risk of condensation,
allowing natural drying-out of the structure. See typical relative humidity / temperature graph below.

Outside surface resistance

External cladding system
Ventilated cavity
ROCKWOOL Rainscreen Slab
Protected cast concrete
Dense plaster
Inside surface resistance

Product specification
ROCKWOOL Rainscreen SL950 ROCKWOOL Rainscreen SL960
R-Value Thickness Width Length # Pieces Area per R-Value Thickness Width Length # Pieces Area per
m²K/W (mm) (mm) (mm) per pack pack (m²) m²K/W (mm) (mm) (mm) per pack pack (m²)
0.70 25 600 1200 12 8.64 0.75 25 600 1200 12 8.64
0.85 30 600 1200 10 7.20 0.90 30 600 1200 10 7.20
1.10 38 600 1200 6 4.32 1.10 38 600 1200 6 4.32
1.45 50 600 1200 6 4.32 1.45 50 600 1200 6 4.32
2.15 75 600 1200 4 2.88 2.20 75 600 1200 4 2.88
2.55 90 600 1200 3 2.16 2.65 90 600 1200 3 2.16
2.85 100 600 1200 3 2.16 2.95 100 600 1200 3 2.16
3.55 125 600 1200 2 1.44 3.70 125 600 1200 2 1.44

For more information at www.rockwool.com/anz

ROCKWOOL
Technical Data Sheet
Ventilated Facade Insulation
1st November 2023

Rainscreen
Installation
Work on site
ROCKWOOL Rainscreen is supplied in shrink-wrapped polythene packs. The product can be easily cut and shaped using a
sharp knife.

Fixings
A suggested fixing pattern is provided; however the adequacy of this or any other fixing pattern should be verified on a
per-project basis through assessment by a suitably qualified individual.
The following non-exhaustive list of companies can supply fixings suitable for use with ROCKWOOL Rainscreen: Ejot,
Fixfast, Fischer, ITW Construction Products, Hilti.

Exposure
It is recommended that the sequence of construction is programmed in such way that insulation is left exposed for as little
time as possible.
While ROCKWOOL insulation is impregnated with a water repelling agent, and is resistant to wind and rain, it is not
designed to offer indefinite protection to a substructure. Depending on the nature of the substrate, a protective membrane
may be required. Such design issues will require assessment by a suitably qualified individual.
Subjecting ROCKWOOL Rainscreen to any level of exposure is contingent on a visual inspection of the insulation prior to
the installation of the cladding. In the unlikely event that any slabs have become physically damaged or otherwise
contaminated, they should be replaced.
Once the weatherproof layer is installed, the resulting ventilated cavity will ensure that any wetted slabs will naturally dry
out, regaining all of their original performance and properties.

For more information at www.rockwool.com/anz

ROCKWOOL
Technical Data Sheet
Ventilated Facade Insulation
1st November 2023

Rainscreen
Steel frame, timber frame or masonry wall cladding systems:

• The ROCKWOOL insulation slabs should be close-butted

at all vertical and horizontal joints. The horizontal joints of
the insulation should be staggered in accordance with
good practice.

• Fixings should have a minimum head diameter of 70mm. A

typical fixing pattern has three fixings per square metre
with one metal fixing at the centre of every slab (see Figure
1).

• The ROCKWOOL insulation slabs should be cut and tightly

fitted around cladding support elements.

600mm
• For a typical installation, a breathable membrane is placed
between the sheathing board and the product. A vapour
control layer is placed between the plasterboard and the
frame (when required).

600mm
Steel frame or timber frame with a brick outer leaf:

• The ROCKWOOL insulation slabs should be close-butted

at all vertical and horizontal joints, and at corners. The
horizontal joints of the insulation of the slabs should be
staggered, in accordance with good practice.

• The ROCKWOOL insulation slabs should be carefully cut to

fit around any protrusions into the cavity.

• A vapour control layer is placed between the plasterboard

and the frame (when required). A breathable membrane is
placed between the sheathing board and the product.

• The ROCKWOOL insulation slabs should be installed to

coincide with the frame, with retaining discs used in
conjunction with the wall ties at no more than 600mm
horizontally and 450mm vertically. Key

• After each section of the leading leaf is built, excess mortar Metal fixing
should be removed from the cavity face and mortar
droppings cleaned from exposed edges of the installed
Polypropylene fixing
board, before installation of the next run of boards. Use of
a cavity board or a cavity batten will protect the installed
board edges and help to keep the cavity clean as the Figure 1: Typical fixing pattern with 3 fixings per square metre
following leaf is built.

Disclaimer: The information contained in this data sheet is only applicable for Australia and is believed to be correct at the date of publication and is subject to change after the date of
printing. This data sheet was designed for general information purpose only. It’s contents should not be construed as representing all performance for these insulation materials. You should
not act or reply on any of the information contained herein without seeking professional advice. We make no representations as to accuracy, completeness, correctness, suitability or validity
100 300 AU-11/23 V2 (EN)

of any information in this document and will not be liable for any errors, omissions, or delays in this information or any losses, injuries or damages arising from it
use. All information is provided on a as-is basis.
ROCKWOOL Malaysia Sdn. Bhd.
Lot 4, Solok Waja 1, Bukit Raja Industrial Park,
41050 Klang, Selangor, Malaysia.
T (+60) 3 3341 3444 · F (+60) 3 3342 7290
For more information at www.rockwool.com/anz info@rockwool.com