Hello
I built a 30 sqm storage shed (uninsulated) at the end of summer.
Went all out with tongue-and-groove boards and two layers of felt (underlayer + top layer).
Now that the Gothenburg winter has arrived, the tongue-and-groove boards are warping quite a bit in some places,
plus there's quite a bit of "blåträ" on it.
What have I done wrong?
Joined the boards too tightly, bought poor quality wood?
The tongue-and-groove boards were in the garage for quite a while before I nailed them up, could that affect it?
Do you have any ideas?
Best regards,
Kalle M
I built a 30 sqm storage shed (uninsulated) at the end of summer.
Went all out with tongue-and-groove boards and two layers of felt (underlayer + top layer).
Now that the Gothenburg winter has arrived, the tongue-and-groove boards are warping quite a bit in some places,
plus there's quite a bit of "blåträ" on it.
What have I done wrong?
Joined the boards too tightly, bought poor quality wood?
The tongue-and-groove boards were in the garage for quite a while before I nailed them up, could that affect it?
Do you have any ideas?
Best regards,
Kalle M
I had the same problem with our house. I waited with the battens to avoid puncturing the roofing paper, which was a mistake. I also put the tongue and groove boards too closely together and nailed them poorly. I've noticed that the boards move about 10% from the driest to the wettest time of the year.
I waited until spring when it dried up, and I could knock and nail more, using a lot of 5" nails...
But when you have roofing paper, I think you'll have to tear it off and then nail down when it dries in the spring, or live with it. Just be careful it doesn't swell more and tear the roofing paper.
Good luck!
I waited until spring when it dried up, and I could knock and nail more, using a lot of 5" nails...
But when you have roofing paper, I think you'll have to tear it off and then nail down when it dries in the spring, or live with it. Just be careful it doesn't swell more and tear the roofing paper.
Good luck!
Hello
Thanks for the responses.
I have nailed with 75mm nails, two per board and roof rafter.
Distance between roof rafters is about 850mm.
Råspont 17x95, (should have gone with 22x95, it might twist less)
It feels like it should be enough, doesn't it?
Is it true that you shouldn't nail råspont down completely but leave a few millimeters gap?
Now there are double layers of felt, the top one being an expensive 3-degree variant, so it will stay as it is.
In the spring, when it dries up properly, maybe I should roll the roof with some wood oil, or alternatively paint it.
That should reduce moisture absorption in the råspont, right?
What do you think?
Thanks for the responses.
I have nailed with 75mm nails, two per board and roof rafter.
Distance between roof rafters is about 850mm.
Råspont 17x95, (should have gone with 22x95, it might twist less)
It feels like it should be enough, doesn't it?
Is it true that you shouldn't nail råspont down completely but leave a few millimeters gap?
Now there are double layers of felt, the top one being an expensive 3-degree variant, so it will stay as it is.
In the spring, when it dries up properly, maybe I should roll the roof with some wood oil, or alternatively paint it.
That should reduce moisture absorption in the råspont, right?
What do you think?
Difficult to know how you got the moisture in the lumber. Before or after assembly.
The most important thing, however, is the ventilation of the storage. Stagnant humid air, which is occasionally heated by the sun on the paper, tends to condense on the inside of the roof when it gets cold and thereby increases the moisture content in the lumber.
Tip: Install vents high up at the ridge. Alternatively, paint the roof when the moisture content is at its lowest. (just as you write)
Personally, I would probably do both.
The most important thing, however, is the ventilation of the storage. Stagnant humid air, which is occasionally heated by the sun on the paper, tends to condense on the inside of the roof when it gets cold and thereby increases the moisture content in the lumber.
Tip: Install vents high up at the ridge. Alternatively, paint the roof when the moisture content is at its lowest. (just as you write)
Personally, I would probably do both.