How are they used?

• The surface of the wall should bevelled off with the Baumit Viton Fein plaster and left to dry back before attaching the boards.
• Once the surface of the plaster is ‘green hard’ (not soft enough to push your finger tip into but soft enough to push your finger nail into) the boards can be fixed.
• Make sure they are in the correct position and then fix with 3 masonry fixings, spaced evenly down the long centre line of the board. Do not over-tighten the fixings as this will make aligning the T&G profile with adjacent boards difficult.
• Once the boards have been installed, the UdiMULTIGRUND vapour regulating plaster can be applied to the surface. Apply a 4-5mm coat, incorporating the UdiREINFORCEMENT mesh and finish flat.
• After 4-5 days the surface can be skimmed with a lime or clay skimming plaster.
• For detailed guidance please download our installation guide in the Product Downloads tab below and to see 3d models, click here for direct plastered versions or here for plasterboard finished versions.

Where are they used?

• As insulation on the interior of any masonry walls.
• They should only be used above ground as they are not suitable for cellars or basement walls.

How are they used?

• There are two ways to apply the boards to a wall. The first involves applying the layer of Viton Fein plaster to the back to the board and the second with the Viton Fein plaster applied direct to the wall.
• Generally, applying the plaster to the board is good for plastered surfaces where you only need a very thin layer of Viton Fein to ensure contact. Where the surface is much rougher, flush-up the surface of the wall with either a lime plaster or the Baumit Viton Fein before applying the boards.
• When applying the Viton Fein to the back of the boards, the UdiTHERM boards should have an approximately 5mm layer of Baumit Viton Fein clay plaster or other suitable clay plaster, applied to the rear of the board, which is combed with a thick bed adhesive trowel to allow good bedding on to the wall.
• Once the boards are in the correct position they can be fixed with 3 masonry fixings, spaced evenly down the long centre line of the board. Do not over-tighten the fixings as this will make aligning the T&G profile with adjacent boards difficult.
• For application to rougher surfaces, with the Viton Fein applied to the wall first, please see the below video.
• Once the clay backing plaster has stiffened (usually 24 hours later) the UdiMULTIGRUND vapour regulating plaster can be applied to the surface. Apply a 4-5mm coat, incorporating the UdiREINFORCEMENT mesh and finish flat.
• After 4-5 days the surface can be skimmed with a lime or clay skimming plaster.

How much will you need?

• The UdiTHERM NF boards are 1186 x 366mm and either 40 or 60mm thick, they cover an area of 0.4134 m² per board. Allow at least 5% for wastage.

Are they heavy?

The wood fibre boards themselves have a density of 160kg/m3 and so weigh around 2.8kg each for the 40mm and 4.2kg for the 60mm. They are easily installed without any specialist lifting equipment.

What is their thermal conductivity?

The thermal conductivity of the UdiTHERM NF boards is 0.038 W/mK, which is equivalent to the SteicoFlex flexible wood fibre insulation.

Can the UdiTHERM NF boards be used on timber studs or a timber frame?

The boards can be used on a timber frame but only over a carrier board such as 12mm OSB or ply. This is because the boards are not rigid enough for use without extra support.

Request an estimate.

In summary, if you are looking for more than just a builders’ merchant, we might be the guys to talk to.

Request an estimate.

In summary, if you are looking for more than just a builders’ merchant, we might be the guys to talk to.

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