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9mm Render Carrier Board STS Class A1

9mm Render Carrier Board STS Class A1
  • 9mm STS Render Carrier Board Class A1
  • Highly-durable construction render board
  • For use on metal and timber structures
  • Ideal board for use with thin-coat silicone render
  • Residential, commercial, and industrial buildings
Estimated delivery:
In Stock
£ 68.68
Ex VAT: £ 57.23
  • Brand: STS®
  • Model: 9mm STS Board
  • Weight: 39.50kg
  • Dimensions: 2,400mm x 1,200mm x 9mm
  • SKU: 9mm
  • Product code: P1-2312
  • MPN: 9mm STS Board

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9mm STS Render Carrier Board Class A1 is a strong and durable construction render board suitable for use on metal and timber structures, an ideal board for use with thin-coat silicone render.

STS Render Board 9mm x 1200mm x 2400mm is composed of heavy-duty fibres which create a high-strength and impact-resistant surface for render application (Render Ready Product).

This makes it a great carrier board for use on a range of projects; including residential, commercial, and industrial buildings.

9mm STS Render Carrier Board Class A1 is a strong and durable construction render board.

STS Boards are especially suited to projects where quick construction, safety, cleanliness and hygiene are of high importance.

Also suitable for use in interior areas of high humidity, like swimming pools, spas and wet rooms.

The density of STS Construction Boards provides the perfect solution for decibel (dB) reduction for party wall partitioning.

Often used in multi occupancy properties and buildings to ensure air borne sound is kept to a minimum.

The STS Construction Board system offers up to 50dB reduction (laboratory tested).

Most common applications of STS Boards are: external render carrier for timber or steel frames, dormer cheeks, bay windows, modular build and park homes.




Thickness: 9mm

Width: 1200mm 

Length: 2400mm

Board Coverage: 2.88m2

Density: 1350kg/m3

Bending Strength: 17.27 MPa

Fixings: STS Cember 38mm

Fire Reaction: EuroClass A1 Non-Combustible (A1fl)


STS Construction Render Board Frequently Asked Question (FAQ):


 · When wet, do STS Render Boards lose any strength, plus, when they dry, do they recover all their original strength?

STS 12mm Construction Boards will lose some strength when wet.

Multiple tests have been carried out which included a pull through test at control conditions when the boards were dry and a pull though test after the boards were immersed in 23°C water for 7 days.

There was a slight loss in strength when the boards were tested after immersion, however, when they reverted to their dry state, all strength had been retained.


 · What is the maximum length of time an STS Render Board can be fitted and then exposed to weather prior to rendering?

We recommend rendering the fitted STS 12mm Construction Board as soon as conditions allow, although these boards can be left fully exposed for up to 3 months prior to rendering.

Pay particular attention to preparation of boards to receive render base coat when boards have been exposed for a prolonged period.

You must ensure boards have fully dried and that the surface is cleaned of any debris and dust that may have been attracted to the surface.


 · How does STS advise on render preparation?

Specific guidance for preparation of boards to receive render varies slightly from each render supplier, so STS recommends following your preferred render supplier’s guidance to ensure validity of warranty.


 · What side of STS Render Carrier Board do I render on to?

Use either side. Both accept render easily.


 · Can I apply sand and cement render onto STS Construction Board?

Although the bonding surface of STS boards is very good for any cement based products, the problem you may have with this type of render is cracking on the joints.

Generally, a silicon thin coat render system is recommended for render boards because it is much more flexible and forgiving to movement.

Cement, however, sets completely solid.


 · Do STS 12mm Construction Boards need to be hard fixed or can they be dot and dabbed?

STS always recommends mechanical fixings in addition to dot and dab onto solid surfaces.


 · Can STS 12mm Construction Boards be used in place of plasterboard?

Yes, STS 12mm Construction Boards have far superior properties in comparison with plasterboard such as fire resistance, impact resistance, strength, breathability, durability to damp and excellent thermal mass properties.


 · Can STS Render Boards support wall fittings?

Yes, STS 12mm Construction Boards will support fittings such as toilet roll holders, shower curtain rails, vanity mirrors, shelves and pictures when appropriate fixings are used.

Larger, heavier fittings such as grab rails and cabinets must always be fitted into supporting stud work.


 · Can STS Render Boards be used behind a wood burning stove?

Yes, STS 12mm Construction Boards are A1 fire rated and an ideal board to use behind wood burning stoves.


 · Can STS Render Boards be painted and plastered?

Yes. Before applying paint or plaster, STS 12mm Construction Boards require priming with SBR Primer.


 · Do STS Render Boards require priming before applying tile adhesive?

Priming STS 12mm Construction Boards is always best practice before applying tile adhesive.

Tests have proved the bond between tile adhesive and 12mm Construction Boards was significantly strengthened when Tilers SBR Primer was applied.


 · What mechanical fixings do I use?

For standard internal use onto timber or metal stud work, use STS 38mm torx screws to fix 12mm boards, 400mm centres.

For external, fire and render applications, fixing methods vary by application.


 · How should STS 12mm Construction Boards be stored?

STS boards are delivered on clearly labelled pallets, wrapped and packaged to prevent weathering and edge damage.

They should be stored flat on a pallet, in dry conditions indoors.

Boards should not be lent upright for long periods of time and whilst stored, moisture should not be allowed to drip on to or infiltrate between stored sheets to prevent surface staining.

Larger sized boards should be always lifted by 2 people and carried on their edge, so to avoid unnecessary damage.


 · What is STS fibre cement board made of?

Portland Cement: binds the ingredients and is made with limestone, clay and iron.

Cellulose Fibres: treated, organic fibres which act as a filler.

Sand: highly durable and creates all weather performance.

Water: dissolves the wood pulp; activates and hardens the cement.

STS Construction Boards have no need of fibreglass mesh for strengthening, which of course is almost impossible to recycle and very irritable when cutting.


 · Are STS Construction Boards recyclable?

Yes, 100%


 · How do I cut the boards?

Use a hand held circular saw fitted with a PCD blade.

Dust extractor recommended.


*Further information may be found in our Downloads section.

Fairly easy access to all PDF files.

Datasheet ǀ Declaration of Performance - DoP ǀ BBA Certificate ǀ Installation Guide ǀ Certificates ǀ Brochure ǀ SPEC Sheet

Board covarage 2.88 m2
Density 1350kg/m3
Length 2400mm
Material Fibre-Cement
Profile Render Carrier Board
Thickness 9mm
Width 1200mm 
Bending Strength 17.27 MPa
Fire Reaction Class A1 Non Combustible
Coverage 2.88m2
Fire performance Fire Rated ǀ Class A1
Finish Smooth
Durability Minimum 30 years
Applications Thin-Coat Silicone Renders
Fixing method Self Drilling Fixings
Features Strong and durable external render carrier board
Manufacturer STS®

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We deliver insulation materials to Mainland UK only. Deliveries to Highlands, Northern Ireland, Isle of Wight etc.. might be possible at additional cost.
We offer free delivery on most of the orders above £300 (excluding VAT) (except special products - shipping cost via courier - products marked ''Request A Quote'')

Delivery of some insulation materials might be extended due to the current situation (Covid-19, stock shortages, allocations).
If you need materials quickly please contact us - we will do our best to help you source materials needed.

We do not deliver on weekends and bank holidays. Sometimes we can deliver on Saturdays - please check with us before placing the order.
If you need any further information please contact us tel. 02081910776

We can help to calculate price per m2 or linear meter (one meter in length) cost, please just contact us via phone 02081910776, email or live chat. Alternatively, you can work it out yourself quickly and easily: to get cost per meter square please divide price shown in orange area by ''Required area (m2)'' Example price of £28.80 divided by board coverage 2.88m2 = cost of £10.00 per m2.


No matter whether you choose a local installer or a national company, there’s a few tips to help you find the right installer for your home insulation improvements, such as asking for recommendations and making sure that they’re part of a certification scheme. This makes sure that they have the right skills and standards of workmanship to carry out the installation, and you can be sure that they know exactly what they are doing.


1. Thermal inspection picture in portfolio

It’s worth seeing a installer’s previous work. There’s no harm asking if you can see any properties nearby that they’ve installed insulation in. Best way would be to see Infrared Thermal Imaging Inspections. Thermal cameras spot small, but key changes in temperature in different areas of a house, identifying problematic areas that the human eye never could and some that a visual inspection could only hypothesize.

2. Reviews

Along with checking recommendations and previous work, finding reviews online can often be a great way to find out if they provide a good service or not. However, it’s best not to solely rely on reviews you may find or review websites, as there’s no controlling who writes them.

3. Compare prices

Comparing prices will also ensure companies can’t take advantage of you and give you a fair price. 

4. Word of Mouth

The best way to find a great insulation installer is through recommendations. Make sure you ask friends and family. They will most likely give you their honest opinion and can tell you from first hand experience.


Whether you require a wall, cladding, external wall, loft or floor insulation fitted, you can find and hire your local insulation installers from popular UK web pages. A simple internet search will return thousands of potential installers near your area.



We are the stockist of construction materials and related products for both trade and DIY from most recognizable brands in the UK like Cordek, RCM, Promat, Rockwool, Isover, Celotex, Xtratherm, Ursa, Low-E, Cedral, Kingspan, Dufaylite, British Gypsum, K-rend, Ecotherm, Iko enertherm, Kay-Metzeler, Terrawool to allow you to complete your insulation job on time at competitive prices and the highest standards.


Whether you are a large company or a DIYer, if you need a large amount of insulation materials, we can offer quantity discounts at the best prices. Please contact us and our friendly customer service will try to find the best and cheapest solutions for you. We value your time and we will try to deliver the products as soon as possible at a reasonable price to your construction site or house. The UK's leading insulation supplier near you and your needs. Price List available upon request.
9mm Render Carrier Board STS Class A1 1200mm x 2400mm
9mm Render Carrier Board STS Class A1
£ 68.68