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- Thermal insulation for roofs and ceilings using FF-EPS
Using FF-EPS insulation as thermal insulation for roofs
FF-EPS insulation products are excellently suited for use with different frame materials in roofs. The frames can consist of wood, steel, concrete or lightweight concrete (Siporex). Structures that are thermally insulated with FF-EPS always require a separate air or vapor barrier layer, as the product does not have a high enough water vapor resistance to function as vapor barrier on its own. The vapor barrier can be constructed using Finnfoam or FF-PIR thermal insulation products or traditional membrane-type vapor barrier solutions. The locking tongue and groove profile of the FF-EPS panels provides an easy way to ensure that the thermal insulation is continuous and leak-proof. The locking tongue and groove joints do not require the use of a PU foam, but any lead-throughs must still be sealed with an elastic PU foam sealant.
Insulation solutions are determined according to the roof structure
NEW FF-EPS 60S X SILENT!
At the end of 2019, Finnfoam
Sloping timber structures
For sloping timber structures, the most effective roof solution with minimal thermal bridging can be achieved if the FF-EPS insulation can be installed as a continuous layer on top of the load-bearing structure. With glued laminated beams, it is also possible to utilize a structure where Finnfoam or FF-PIR panels are installed on the bottom surface of the joists as a vapor barrier, and FF-EPS panels with the thickness required to reach the desired U value are foam sealed in between the joists.
The thickness of insulation is determined according to the desired U value. The below table includes a few structure examples.
Framework | Insulation/framework | FF-PIR | u-value W/m2K |
Hollow-core slab | Insulation on top of hollow-core slab | FF-EPS M or FF-EPS X 60S/200 mm + bearing layer of wool 20-30 mm | 0,14 |
Hollow-core slab | Insulation on top of hollow-core slab | FF-EPS M or FF-EPS X 60S/320 mm + bearing layer of wood 20-30 mm | 0,09 |
Hollow-core slab | Insulation on top of hollow-core slab | FF-EPS M or FF-EPS X 60S/400 mm + bearing layer of wool 30 mm | 0,07 |
Hollow-core slab | Insulation on top of hollow-core slab | FF-EPS 60S X SILENT 320mm | 0,09 |
Double T-slab | Insulation on top of slab | FF-EPS M or FF-EPS 60S/320 mm + bearing layer of wood 20-30 mm | 0,09 |
Corrugated sheet steel | 40 mm stone wool below | FF-EPS M 60S/150 + 150 mm or FF- EPS M 60S/300 mm + bearing layer of wood 20-30 mm | 0,09 |
Glued laminated beam height | FF-PIR 50 mm or Finnfoam 70 mm on the inside | FF-EPS 60S/200 + 200 mm in between | 0,07 |