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12.7mm DensGlass A1 Fire Rated External Sheathing Board

12.7mm DensGlass A1 Fire Rated External Sheathing Board 2400mm x 1200mm - 2.88m2
12.7mm DensGlass A1 Fire Rated External Sheathing Board 2400mm x 1200mm - 2.88m2
12.7mm DensGlass A1 Fire Rated External Sheathing Board 2400mm x 1200mm - 2.88m2
12.7mm DensGlass A1 Fire Rated External Sheathing Board 2400mm x 1200mm - 2.88m2
12.7mm DensGlass A1 Fire Rated External Sheathing Board
  • DensGlass Fibreglass Mat with a Gypsum Core
  • BBA Certified No.21/5958
  • Replaces traditional paper-faced sheathing
  • No breather membrane required!
  • Fire Rated Class A1, Non-combustible Board
Estimated delivery:
In Stock
£ 107.28
Ex VAT: £ 89.40
  • Brand: RCM®
  • Model: 12.7mm Densglass
  • Weight: 25.92kg
  • Dimensions: 2,400mm x 1,200mm x 12.70mm
  • SKU: 12.7mm Densglass
  • Product code: P1-2186
  • MPN: 12.7mm DensGlass

Options available

DensGlass A1 Fire Rated Sheathing Board 12.7mm is an A1 non-combustible external sheathing board that consists of a fibreglass mat with a gypsum core, designed to provide a high degree of protection from the elements in external cladding constructions.

12.7mm DensGlass Gold Sheathing Board is an ideal product for exterior ceilings and soffits for both cold and warm climate zones due to its ability to resist sagging, even under exceptionally humid conditions. 

Widely recognised by the GOLD colour, DensGlass fibreglass mat gypsum sheathing board, has an exemplary track record that spans more than 30 years in the US market place and now available in the UK exclusively from Benx.

Densglass Fibreglass Mat Gypsum Sheathing Board is a BBA Certified, high performance scribe and snap 2400mm x 1200mm board, that might be cut using the score and snap method, no power tools are required.

Densglass Gold Boards can be drilled and nailed using conventional hand tools, offering many of the properties of timber.

Can be used in applications such as under wood shakes or shingles, plywood panel siding or other horizontal siding applications. 

DensGlass Sheathing adds performance and durability to a wide range of fire-rated and non-fire-rated building assemblies.




Thickness: 12.7mm

Length: 2400mm

Width: 1200mm

Density: 750kg/m3

Board coverage: 2.88m2

Moisture Resistance: GM-H1

Reaction to Fire: BS EN 13501-1 Class A1 Non Combustible

Biological Resistance: Level 10 ASTM D3273

Surface Condition: Fleeced - Matt

Nominal Mass: 9.3kg/m2

Board weight: 26.78kg

Fire Reaction Tests: BS EN 13501-1:2007 + A1:2009 Class A1 Non-Combustible.

Steel Frame Fixing: RCM 4.2 x 32 Tek screw

Timber Frame Fixing: RCM 4.2 x 42 Tek screw


DensGlass Exterior Sheathing Installation:

 · DensGlass® Sheathing can be installed to timber or steel framing either vertically or horizontally without sacrificing wall strength between studs.

 · Fasteners should be driven into the framing system so that the heads are at or slightly below the surface of the DensGlass® Sheathing without breaking the glass mat or fracturing the core.

 · Locate fasteners at least 9 mm from the ends and edges of the sheathing.

 · The framing width shall not be less than 38mm for timber framing and 32mm for steel framing.

 · Framing members should not vary more than 3mm from the plane of the faces of adjacent framing.

 · Fastener fixing patterns and spacings will vary according to fire performance, wind loading, shear and racking strength requirements. 

 · Do not apply DensGlass® Sheathing below the ground.

 · Design details such as fasteners, sealants and control joints per system specifications must be properly installed.

 · All horizontal and vertical joints between boards as well as openings and penetrations must be properly flashed and sealed .

 · Do not use DensGlass® Sheathing as a base for nailing or mechanical fastening.

 · Fasteners should be flush to the face of the board, not countersunk.


*Further information may be found in our Downloads section.

Fairly easy to 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
Colour Gold
Commpressive Strength min. 3445 kPa
Length 2400mm
R-Value 0.089m2K/W
Thermal Conductivity 0.30W/mK
Thickness 12.7mm
Weight 25.92kg
Width 1200mm
Fire Classification A1, non-combustible
Edge profile Square Edge
Coverage 2.88m2
Finish Glass mat facings
Shipping method Articulated Vehicle
Applications Rainscreen, timber cladding, facades
BBA Certified Yes, No. 21/5958
Fixing method RCM 4.2 x 32 / 42 Tek screws
ETA Notification Yes
Features Fire Rated External Sheathing Board
Manufacturer RCM Benx DensGlass®

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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.
12.7mm DensGlass A1 Fire Rated External Sheathing Board 2400mm x 1200mm - 2.88m2
12.7mm DensGlass A1 Fire Rated External Sheathing Board
£ 107.28