Universal wood fibre insulation board – NaturHeld

Product overview

Where is it used?

• On top of your rafters, preventing thermal bridging and preventing overheating.
• To insulate walls on timber frame or masonry structures finished with cladding.
• As an internal plaster carrier or external render carrier.
• NaturHeld 60mm can also be used as part of walls where 60 or 90 mins fire resistance is required.

How is it used?

• For roof applications, wood fibre insulation sarking boards should be laid on top of the rafters, covered with a breathable membrane and ultimately fixed in place with counter-battens.
• 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 NaturHeld 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 boards 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 NaturHeld wood fibre insulation sarking boards typically cover an area of 1500 x 580mm (0.87m²).
• Allow 5-10% wastage depending on the complexity of the roof/facade.