Roofs and attics
Thanks to the excellent insulation properties of Finnfoam insulation materials, attic insulation is now uncomplicated and saves space. Because of its completely homogenous and closed cell structure, Finnfoam boards require no separate wind protection or vapour barriers. Finnfoam insulation boards also require no additional studwork under the joists. Instead, the insulation boards can be installed under the joists in an unbroken structure that minimises cold bridges.
For the roof
Thanks to the excellent insulating properties and workability of Finnfoam insulation materials, attic insulation is now uncomplicated and saves space. The FL-K600 and the FL-K900 are quick and easy to use in new buildings and may also be used in renovation projects where the spacing of the joists and support beams is regular.
In old houses, the first insulation layer is usually installed between joists and glued in place using elastic polyurethane foam. An unbroken insulation layer is then installed beneath the joists so that the second layer of Finnfoam boards covers all seams of the first layer, leaving no cold bridges.
The Finnfoam range of products also features a special 210 mm insulation board intended for insulating roofs and attics. The board is mainly intended for new buildings as the self-sealing structure used in the boards only allows for approximately ±10 mm variation in joist spacing. The roof insulation boards are designed for 600 mm and 900 mm spacing. Using Finnfoam insulation materials, wind protection, thermal insulation and a vapour barrier are achieved in one easy installation stage. Additional information about the new product is available in the ‘Walls’ section.
Seal the joints with care
Because the material does not crumble or produce dust, Finnfoam can easily be worked using a box cutter to cut pieces to the desired shape and size. The leakproof structure eliminates loss of heat due to warm air rising upwards. As the completely homogenous and closed cell structure blocks airflow efficiently, special attention should be paid to careful insulation of the joints between the boards. Elastic polyurethane foam is used to create a homogeneous and leakproof structure, which also insulates sound to some extent.
Elastic polyurethane foam can also be used to glue Finnfoam pieces together to minimise waste. How leakproof the structure is has no impact on a structure's U-value. A leakproof structure (with a leak value of 1), however, uses over 15% less energy compared with a structure with regular leak characteristics (a leak value of 4).
Thanks to the excellent insulating properties and workability of Finnfoam insulation materials, attic insulation is now uncomplicated and saves space. An unbroken insulation layer is created under the joists eliminating all cold bridges.
The importance of the ventilation gap
No moisture can penetrate the Finnfoam boards, which is why ventilating them is not crucial. Keeping the joists dry, however, requires ventilation, which is why a ventilation gap of approximately 50 mm must be left between the sub-roofing and the Finnfoam insulation.