Base Board

Superior Attributes

Euroclass A1 non-combustible
Moisture resistant
Mould resistant
Impact resistant
Breathable
Score & snap cutting
Easy fixing method
Environmentally friendly

Key Applications

Budget Render carrier
EWI Systems
Brickslip & stone cladding carrier
External facades
Non-combustible SFS rainscreen & infill sheathing
Volumetric and pod manufacture
Stove surrounds (12mm board)

Base Board is the perfect choice to create a fast build weather and air tight envelope with a sturdy breathable, easy-fix building board. Dual faced with a smooth surface and a heavily keyed reverse, Base Board is ideal as both a sheathing and budget render carrier board. The boards are also fire rated giving your building envelope added protection.

Base Board has been UKAS tested to achieve 60 minutes fire resistance on steel stud partition with a single layer of board on fire side and fireline plasterboard on unexposed face.

A maximum performance alternative to plywood, OSB3, gypsum and cement based boards. Benefit your construction project by completing multiple applications with Base Board.

Criteria	Value
Density	1150 – 1200kg/m³
Reaction to Fire	Euroclass A1 to EN13501-1
Thermal Conductivity	0.307 W/mK
Dimensional Tolerance Length & width	+/- 2mm
Dimensional Tolerance Thickness	+/- 0.2mm
Dimensional Tolerance Edge Straightness	1mm per metre

Thickness	Length	Width	Weight per Sheet
10mm	2400mm	1200mm	33.1kg
12mm	2400mm	1200mm	39.7kg

Can I put sand & cement onto Base Board board?
Base Board has a high suction capability and manufactured renders have additives which control the rate of curing to ensure a strong bond with the board. Sand and cement mixes have been used successfully numerous times with Base Board carrier boards but due to lack of dedicated testing and quality assurance we cannot recommend this application for use. The decision of the compatibility is the sole responsibility of the render applicator.
What side of board do I render on to?
The ready keyed surface provided by the rough face.
Rendering on to Base Board
Base Board must always be fitted exactly in accordance with detailed fitting guidelines provided in ‘Resistant Multi-rend Brochure’ available for download (this fitting guidance covers both our render boards). Preparation of Base Board to receive render basecoats must be carried out in accordance with guidelines provided in the associated brochure. Specific guidance for preparation of boards to receive render may vary slightly from each render supplier – their guidance should be requested and followed to ensure validity of render supplier’s warranty.
What is the maximum length of time a Resistant Base Board can be fitted and exposed to weather prior to rendering?
We recommend rendering the fitted board as soon as conditions allow, however the 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 the board has been allowed to fully dry throughout and that the surface of the board is brushed down to remove any debris, dusts and magnesium salts that may have migrated to the surface. Please note, the boards should not be specified for use in ground contact.
Are Resistant boards still breathable after surface finishes have been applied?
The boards can remain breathable but this depends on the type of finish and how it is applied. Always refer to manufacturers guidelines but as a rough guide, check WVP (Water Vapour Permeability) and Sd values. Paints with an Sd value below 0.14 are considered to be Class 1 Vapour Open and to have high breathability performance. For breathable lime plasters and renders, MPL 1 primer must be used. Please refer to our primer information sheet.
What fixings do I use?
Stainless steel fixings must be used at all times with base board. Please refer to the Multi-rend fitting guidance for detail on how to also fix Base Board.
How can the boards be cut?
Very easily! By score and snap with a standard craft knife, Stanley blade and can be hand or machine sawn. We would recommend a saw with Tungsten Tipped Carbide blade. A video of the score & snap method can be found here (link to video).
Do we have a pull-out test for screws?
A series of our boards have been tested for pull-out strengths with Ejot, Sympafix and Rawlplug fasteners to name a few. These reports are available upon request.
When wet do the boards lose any strength?
When dry do they recover all their original strength? Yes, the boards will lose some strength when wet.