I will be installing vertical board-and-batten siding on the wall (145 mm baseboards and 45 mm battens). The question is whether one needs a vertical furring strip for ventilation, or if it's enough with horizontal nail battens and a 10 mm gap between the baseboards? I know it would be better with ventilation strips, but I am trying to keep the facade as thin as possible since there are two buildings that are quite close to each other...
I have read both Svenskt trä/Träguiden and Sveden trä, but the advice is somewhat ambiguous...
Träguiden:
"Previously, it was believed that the gaps between the panel boards provided sufficient ventilation. Recently, the practice has been to extend the nail battens from the frame by using ventilation strips. This also has the advantage that water penetrating behind the battens cannot sit on the nail battens and penetrate into the wall. An alternative to prevent water from entering the wall is to design the upper side of the nail battens to slope outwards towards the panel."
"In the same way as described for board-and-batten (carpenter's panel), vertical ventilation is handled by the gap behind the battens. However, a vertical ventilation strip behind the nail battens further improves ventilation."
Sveden trä:
"In locations exposed to driving rain, it is suitable to attach a vertical ventilation strip or distance plates of, for example, 8 board between the nailing rule and the weather barrier to ensure ventilation and prevent water on the nailing rule's top side from penetrating and damaging the wall construction. This is especially important with board-and-batten and tongue-and-groove paneling. In board-and-batten, ventilation is considered to be provided by the design itself with panels and nailing rules."
I have read both Svenskt trä/Träguiden and Sveden trä, but the advice is somewhat ambiguous...
Träguiden:
"Previously, it was believed that the gaps between the panel boards provided sufficient ventilation. Recently, the practice has been to extend the nail battens from the frame by using ventilation strips. This also has the advantage that water penetrating behind the battens cannot sit on the nail battens and penetrate into the wall. An alternative to prevent water from entering the wall is to design the upper side of the nail battens to slope outwards towards the panel."
"In the same way as described for board-and-batten (carpenter's panel), vertical ventilation is handled by the gap behind the battens. However, a vertical ventilation strip behind the nail battens further improves ventilation."
Sveden trä:
"In locations exposed to driving rain, it is suitable to attach a vertical ventilation strip or distance plates of, for example, 8 board between the nailing rule and the weather barrier to ensure ventilation and prevent water on the nailing rule's top side from penetrating and damaging the wall construction. This is especially important with board-and-batten and tongue-and-groove paneling. In board-and-batten, ventilation is considered to be provided by the design itself with panels and nailing rules."
I had the exact same question as you a couple of days ago. The answer seems to be that you can do so, but it's better with ventilation battens.
https://www.byggahus.se/forum/threa...ndast-liggande-spiklaekt.378598/#post-3726118
https://www.byggahus.se/forum/threa...ndast-liggande-spiklaekt.378598/#post-3726118
Yes, if you use a simpler cover panel with equally wide boards, you'll have several cm gaps between the base boards, so there shouldn't be any problems. But with narrow covers, there isn't much space... Oh well, I guess I'll have to live with it being unclear and hope for the best.
Member
· Västernorrland
· 12 010 posts
Much depends on what you're going to paint with later as well. Most modern dense paints probably require a ventilated panel on the back... otherwise, you're probably asking for trouble.