Universal wood fibre insulation board – Beltermo Ultra

Product overview

Where is it used?

• On top of your rafters, preventing thermal bridging and keeping noise out, especially for loft conversions.
• Behind any cladding on walls on timber frames or masonry.
• As an internal plaster carrier or external render carrier.
• Beltermo Ultra is suitable for pitched and flat roof constructions.

How is it used?

• The Beltermo Ultra wood fibre insulation sarking boards should be laid on top of the rafters and fixed in place with counter-battens.
• For roofing applications the first row should start at eaves level and working in rows, work your way up the roof.
• To reduce waste the overhang from the first row should be trimmed off and used to start the second row and so on.
• For use behind cladding the same principles apply.  When working on masonry structures, unless the wall is very flat, timber battens should be fixed to the surface first with SteicoFlex flexible wood fibre insulation between the battens. The Beltermo Ultra can then be fixed to these battens, avoiding any voids behind.
• Alternatively, apply a levelling plaster to the surface of the wall, texture with a knotched trowel and fix the boards to the surface whilst still wet.
• Any cut joints or corners can be taped with Ampacoll Fenax tape to ensure weather-tightness.
• Boards are not suitable for walking directly on unless supported underneath.
• For installations where the Beltermo Ultra will be left exposed for more than 8 weeks or where metal roofing is to be used, install Ampatop Protecta breathable membrane over, prior to fixing of the counter-battens.
• To see how to use this product in roofing applications see our guide here – How to install roof insulation
• To see how to use this product on masonry in rendered walling applications see our guide here – How to install on masonry rendered wall insulation
• To see how to use this product on timber frame in rendered walling applications see our guide here – How to install on timber frame rendered wall insulation
• To see how to use this product on timber frame in clad walling applications see our guide here – How to install on timber frame clad wall insulation

How much will you need?

• The Beltermo Ultra wood fibre insulation sarking boards typically cover an area of 1870 x 570mm (1.07m²) but the exact board sizes vary slightly, depending on their thickness. The 40mm Beltermo Ultra boards are smaller, 1230 x 580mm and cover 0.7134m².
• Allow 5-10% wastage depending on the complexity of the roof/facade.