Thermal insulation for exterior walls using Finnfoam

The thermal insulation of walls can be constructed using standard flat-edged or rebated Finnfoam panels, but we also offer products designed specifically for this use. As the Finnfoam wall structure can be built without separate vapor barriers or wind-proofing, the material cost of construction is reduced. In addition, the low number of work elements increases the efficiency of installation. The enclosed comparison illustrates the cost efficiency of a Finnfoam wall:

Materials	Wool wall		Finnfoam wall
	Material (€/m²)	Installation (€/m²)	Material (€/m²)	Installation (€/m²)
Timber frame 50 x 150 (3,00€/m)	5,01	-	-	-
Timber frame 50 x 125 (2,60€/m)	-	-	4,34	-
Wool 150 mm (6,50€/m²)	6,50	1,80	-	-
Backing 50 x 50 (0,90€/m)	1,50	4,50	-	-
Wool 50 mm (2,70€/m²)	2,70	1,80	-	-
Vapor barrier plastic (1,50€/m²)	1,65	3,00	-	-
Wind-proofing gypsum board (1,85€/m²)	1,85	4,50	-	-
Plank wood 100 x 22 (0,50€/m)	0,84	4,50	-	-
Finnfoam 140 mm (17,00€/m²)	-	-	17,00	3,00
In total (incl. VAT)	20,05	20,10	21,34	3,00
In total (incl. VAT)	40,15€/m²		24,34€/m²

* The prices (VAT 0%) are based on hardware store prices for professional small-scale constructors in 2008. The labor cost is €30/h (incl. VAT) Additional supply costs, such as screws, nails, tapes, seam foam, etc. apply. In addition, as the thickness of the wall increases, more indirect costs are also incurred, such as the need for additional roofing material.

Operating principle

The Finnfoam wall insulation panels are designed for a stud spacing of 600 mm and provide savings in terms of both the number of work elements and space consumed by insulation.

The panels are easy to install as they require no additional wind-proofing, vapor barriers or backing. Thin construction and cost-effective insulation thickness: 179 mm, U value 0.22–0.24 (insulation 140 mm) and 249 mm, U value 0.15–0.16 (insulation 210 mm). The Finnfoam wall insulation panels have all the great properties of Finnfoam. The vapor barrier is not punctured by nails, it functions both ways, and the panels also provide a sturdy base for gypsum board used as interior cladding, for example.

All the thermal insulation required for the wall structure as well as the vapor barrier and wind-proofing can be provided with a single work element.

The structure is also very safe in terms of moisture performance, as the interior cladding follows the relative humidity of indoor air while the framework and exterior cladding follow the relative humidity of outdoor air. In addition, the completely consistent and closed cell structure of Finnfoam prevents the formation of mold.

Structural airtightness is an important part of the energy economy of a building. The airtightness of a building is represented by the air leakage rate, which in a timber-framed building is 4 on average. By improving the leakage rate from 4 to 1, you can save 15% of the entire energy consumption of the building (small house). Studies show that Finnfoam wall insulation is highly leak-proof – even at joints! All seams must be sealed carefully with a flexible PU foam.

 

Finnfoam insulation panels

Included below are some examples of wall insulation panels. 

 

FI-K600 210/65 mm (Ventilated foundation, Walls, and Ceiling)

Thickness 210 mm

Width 600 mm

Length 2,600 mm

 

FL-K600 210 mm (Ventilated foundation, Walls, and Ceiling)

Thickness 210 mm

Width 600 mm

Length 2,600 mm