Newly certified Manufacturers Certification criteria

No element found

0Products in the comparision list
Compare all


Certified since Nov. 19, 2015
Climate zone Cool, temperate
Window Type Attic Staircase
Efficiency Class phA+
Material Timber
UW 0.51 W/(m2K)


Attic stairs made of pinewood with thermally seperated metal fittings and 3 sealing-levels (EPDM). Attic stair hatch of Styrofoam (λ = 0.031 W/mK) with a coating of high density fibreboard (HDF). Sorrounding insulation (λ = 0,035 W/mK) to ceiling structure connection.

Name Frame width U-Value Ψ-Value Frsi-Value
Bottom 40 mm 0.52 W/(m²K) 0.000 W/(mK)
Top 40 mm 0.52 W/(m²K) 0.000 W/(mK)
Lateral 40 mm 0.52 W/(m²K) 0.000 W/(mK)

FAKRO Sp.z.o.o.

ul. Wegierska 144a
33-300 Nowy Sacz

U-Value Calculation

To Testers: this is not finished as of now

Please select preferred window layout