Hello everyone,
I have a question about the correct construction of the wall assembly for a dormer.
On top of our garage roof, we have a carpenter-built flat-roof dormer. It is constructed with a timber frame (200mm (8 inches) beams) and sheathed from the outside with OSB boards (22mm (7/8 inch)). Over the entire surface of the OSB sheathing (excluding the window openings), an underlay membrane (Rewasi Top) has been installed. The roof is already covered with titanium zinc sheet metal.
Now, my question concerns the proper assembly on the outside. We would like to clad the side walls and front wall with horizontally installed wooden battens or similar material. What is the correct way to attach these? Should we simply screw vertical battens onto the OSB boards and then fasten the cladding onto these battens?
I’m a bit concerned that water might get behind the cladding and cause problems. Or can the underlay membrane handle this without issues? It might also be relevant that there is barely any roof overhang, but drip edges are installed at the top edge on the sides and front.
I hope I have explained myself clearly enough.
I have a question about the correct construction of the wall assembly for a dormer.
On top of our garage roof, we have a carpenter-built flat-roof dormer. It is constructed with a timber frame (200mm (8 inches) beams) and sheathed from the outside with OSB boards (22mm (7/8 inch)). Over the entire surface of the OSB sheathing (excluding the window openings), an underlay membrane (Rewasi Top) has been installed. The roof is already covered with titanium zinc sheet metal.
Now, my question concerns the proper assembly on the outside. We would like to clad the side walls and front wall with horizontally installed wooden battens or similar material. What is the correct way to attach these? Should we simply screw vertical battens onto the OSB boards and then fasten the cladding onto these battens?
I’m a bit concerned that water might get behind the cladding and cause problems. Or can the underlay membrane handle this without issues? It might also be relevant that there is barely any roof overhang, but drip edges are installed at the top edge on the sides and front.
I hope I have explained myself clearly enough.
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