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Regional validity

Scope

exposed rafter
Cross-section of standard configuration

exposed rafter
Standard configuration

Note

The design of the under-roof construction and of the counter-battens have to be specified according to the roof pitch and the national requirements. Depending on the requirements (eg increased rainproof under-roof), an additional underlay is required.

Register of building materials used for this application, cross-section (from top to bottom)

Thickness [mm] Building material Thermal performance Reaction to fire­
λ μ min – max ρ c
A concrete roof tile or tiled roof 2100 A1
B 30,0 spruce wood battens (30/50) 0,120 50 450 1,600 D
C 50,0 spruce wood counter battens (Austria: minimum height 50 mm), Germany 30 mm 0,120 50 450 1,600 D
D 15,0 fibreboard (MDF) 0,140 11 600 1,700 D
E construction timber (80/..; e=800) 0,120 50 450 1,600 D
F - variable insulation material
G vapour barrier sd≥ 2m 1000
H 40,0 spruce wood tongue and groove, fire protection cladding (Germany Minimum 50 mm) 0,120 50 450 1,600 D
I construction timber in acc. with structural design 0,120 50 450 1,600 D

Variations of building components

Thickness of layer Fire performance Thermal performance Acoustic performance Eco Sustainability Mass
Thickness [mm] Building material Σ REI U [W/(m²K)] Diffusion Rw (C,Ctr) OI3Kon m [kg/m²]
sdshzx02-00 E
F
180,0
180,0
construction timber
cellulose fibre [040; 50]
315,0 30 0,22 adequate 42 (-2,-8) 109,2
sdshzx02-01 E
F
240,0
240,0
construction timber
cellulose fibre [040; 50]
375,0 30 0,17 adequate 44 (-2,-8) 114,6

Last update 19.04.2018/hfa.plb