Hello!
Need your help. We're having a discussion with our craftsmen about how to nail lock paneling. What is the correct method? As we understand it, the nail should not go through both the lock panel and the underlying panel. They claim it doesn't matter.
You are right, check http://www.traguiden.se where you can find instructions on how the panel should be nailed. The boards should be able to move independently of each other, therefore you should not nail through both.
The principle is that the panel is nailed with a row of nails in the middle. The cover batten is also nailed in the middle, and the nail should go through the joint between the panel boards. This is so the panel boards can shrink and expand without pulling out any nails.
The principle is that the panel is nailed with a row of nails in the middle. The overlaying lath is also nailed in the middle, and the nail should go through the joint between the panel boards. This is so that the panel boards can shrink and expand without pulling out any nails.
As I understood it, it is the overlay panel the original poster was supposed to install, not the overlay lath panel, and in that case, the bottom board is nailed in the center, while the overlay board is nailed with two nails that should not go through the bottom board.
Yes, that's correct. It was me who read carelessly. But the principle remains the same; the panel should be able to move without pulling out the nails. So you don't nail through both layers.
Yes, I fully agree with you on that. I wrote it earlier as a response too, so to Ts we say in unison, grab the carpenters by the ear and tell them: redo, do it right.
Driving a nail into the middle of the underboard doesn't look smart, even if the theory might hold. In practice, the underboards are nailed at the edges so the heads are hidden by the cover board. Depending on how wide the cover is, one or two nails are driven approximately 1cm from the edge later to prevent cupping, and they often go through the underboard, but it's unavoidable many times as the underboards are not spaced evenly everywhere. It would be interesting to hear if anyone has had problems with nails going through both the cover and underboard, I never have.
Same here, the lock panel on the house has been in place for 5 years now, not a nail has moved, not a crack has appeared, despite being nailed with double nails through both layers practically everywhere.
Agree with the thread creator! Having the same discussion.
Newly installed 3-week-old panel installed by a craftsman: 170 underboards and 95 cover boards, the distance between the cover boards varies between 60 - 115 mostly around 95-100.
Nailed through both cover and baseboard everywhere. I claim that this is not OK; it should be about 120 between the covers and not be nailed through both, but the craftsman says he has always done it this way. Why then does the panel crack on at least 10% of the boards after just 3 weeks?
Sour! I have no answers but somewhere (laterally) there should be a boundary for when to stop nailing the battens in the middle. b=45mm is most common as I understand it and it is nailed in the middle in a thin gap 5-10mm between the bottom boards.
But the wider the battens get, the higher the risk becomes that they sort of become bowl-shaped with just one nail/screw in the middle. I'm considering using 70mm wide ones instead of 45mm since you can have a slightly larger gap (for ventilation) between the bottom boards. But I'm a bit worried about that.
And when I see your pictures, it confirms the idea that it's easy to make mistakes (if they have made mistakes, I don't know).
In your case, both the bottom boards and slats are cracking, maybe because the nails are placed next to each other instead of zig-zag along the boards.
Two methods for batten panel (e.g., 160x22&45x22):
1. Screw in the middle of the bottom boards (cc1200mm) (or no one I've talked to has done this or says it's right except for the wood guide). Screw in the middle of the batten between the bottom boards (cc600mm).
2. Carpenters I've spoken to: nail or screw bottom boards every 600mm but on different sides each time (farthest out towards the edge), guessing this is to prevent it from cracking like you’ve experienced. Cover nail/screw with batten that is nailed/screwed every 600mm in the middle (between the bottom boards).
What is right? I don't know. And then when the batten becomes wider, it feels almost impossible (in my head) to get it right (even though I see lots of houses with battens as wide as the bottom boards, etc.)
I was thinking about one more thing. The drip flashing over the windows (there are probably more methods that are okay) but if you read External Wood Paneling on (http://www.byggbeskrivningar.se/), the drip flashing should be installed under the nailing rule; yours under the roof are outside the baseboards? Or is there some bending and trickery there that's not visible in the pictures?
Hello baljbalj
They are sitting behind the bottom boards even though it doesn't look like it in the picture.
However, I think they are too short. They only stick out barely 1 cm from the window frame, I can't find any practice on this. But the ones they tore down stuck out 4 cm, now it's dripping straight down onto the lower flashing.
It's unfortunate that it has cracked so much; I believe it's due to the quality rather than how the panel was installed. These underboards should have been sorted out during installation, as there's often a hint of a crack from the start.
The fact that it drips on the flashing underneath is annoying, but it only happens when it is almost completely still, and unfortunately, that's when it sounds the most.
How do you attach the lockstöten (I think that's what it's called, lying edge or a bit wider that lies under the roof and the cover slat is kind of pushed up against it)?
Does there need to be a nailing strap right under the roof board and do you nail in the gap between the baseboards there as well, or do you attach it to the baseboards?
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