Marcel1981
2025-06-19 16:03:05
- #1
Hello,
I had a garage built. The dimensions are 4.60 m x 10.50 m. The masonry (24 cm stone) stands on a fully poured floor slab. The top edge is a continuous ring beam.
I want to build the flat roof myself using timber construction. The structure should be (from bottom to top): - Gypsum board - Vapor barrier - Rafters with insulation in between - Fire protection boarding or rough boards - Roof covering with bitumen membranes or EPDM foil
Now to my question, how far should or must the cross rafters rest on the ring beam? If I lay them across the entire ring beam (25 cm), I can no longer apply insulation from the outside. And the exterior plaster would not really adhere to the wood of the cross rafters either. Can anyone help me here or am I making a mistake in my thinking?
Thanks in advance.
I had a garage built. The dimensions are 4.60 m x 10.50 m. The masonry (24 cm stone) stands on a fully poured floor slab. The top edge is a continuous ring beam.
I want to build the flat roof myself using timber construction. The structure should be (from bottom to top): - Gypsum board - Vapor barrier - Rafters with insulation in between - Fire protection boarding or rough boards - Roof covering with bitumen membranes or EPDM foil
Now to my question, how far should or must the cross rafters rest on the ring beam? If I lay them across the entire ring beam (25 cm), I can no longer apply insulation from the outside. And the exterior plaster would not really adhere to the wood of the cross rafters either. Can anyone help me here or am I making a mistake in my thinking?
Thanks in advance.