Poem about damp decking boards, as they often are. Mine were from Bauhaus. I have, 3 years later, about a 2-3 mm gap. Perfect. My neighbor had a 2-3 mm gap from the start. He now has 5-6 mm, 2-3 mm too much. Buy Jula's decking screws, cheapest and very good. No faults after 300 screws and 3 years.
 
D
How long does it take for decking boards to dry after impregnation?

I understand that it varies, but these have been stored under a roof outdoors in Stockholm.

I went to inspect my bundles today that are to be delivered on Thursday and they looked really dry. I'm considering whether I should dare to lay them together or if I should use the knife edge.
 
Can only confirm that Biltema's decking screws are rubbish. Laid a deck of larch wood with Essve stainless and all screws have held perfectly. I used Biltema's decking screws for posts/railing of pine but many of these bent after being driven in a few centimeters. Eventually got enough in to get the fence up but questionable how long it will last... About every tenth screw bent (see pictures below).
 
  • Bent screw on dark wood surface, illustrating a DIY project issue with screw durability from a forum discussion on construction and renovation.
  • Package of Biltema terrace screws labeled "Trallskruv" with a size of 4.2 x 75 mm, showing screws inside a plastic container.
D
Their anchor screws for outdoor use are, if possible, even worse. A complete joke, actually.
 
Stop buying the Biltema junk, it's worth getting good stuff and avoiding swearing.
 
D
The quality at Biltema is mixed. Some things are bargains, others are junk.
 
Nissens
Holger Gross Holger Gross said:
Not entirely sure it's due to the screw. A common reason is that the decking boards are placed tightly against each other. Over time, the decking boards typically swell and cause abnormally high stresses on the screws, which can then break. The type of screw you used is relatively brittle compared to stainless steel screws, which are slightly tougher. According to Svenskt Trä's recommendations, decking should be laid with the required edge-to-edge distance to avoid your problem. For example, a 120 mm wide decking of impregnated pine should be laid with a 26 mm edge-to-edge distance. This allows the decking boards to swell when absorbing moisture during precipitation. As seen in the picture, the decking boards are mounted tightly against each other, or at least with too small of a gap. Deformations (shape changes) in the boards can be a contributing factor in combination with brittle low-quality screws.
26mm???
Well, this spring I laid a smaller deck with 120 decking. I had a knife blade thickness as a spacer. Now there are almost too large gaps between the boards when they've dried. And now it's even the warm, humid season, it's likely to be even bigger gaps in winter... if I had 26mm, the dog would have fallen through the deck now.. :crysmile::crysmile:
 
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Nissens Nissens said:
26mm???
I mean, this spring I laid a smaller wooden deck with 120 decking. I used the thickness of a knife blade as a spacer. Now there are almost too large gaps between the decking when they dry. And now it's still the warm, humid season, it's likely to be even bigger gaps in winter... if I had 26mm the dog would have fallen through the deck now.. :crysmile::crysmile:
Nissens Nissens said:
26mm???
I mean, this spring I laid a smaller wooden deck with 120 decking. I used the thickness of a knife blade as a spacer. Now there are almost too large gaps between the decking when they dry. And now it's still the warm, humid season, it's likely to be even bigger gaps in winter... if I had 26mm the dog would have fallen through the deck now.. :crysmile::crysmile:
Hi, apologies, edge-to-edge distance 26 mm should naturally be 126 mm. The number 1 got left out.
 
Nissens
Holger Gross Holger Gross said:
Hi, I apologize, edge-to-edge distance 26 mm should of course be 126 mm. The number 1 was omitted.
Aha, ok. But if you lay newly printed (wet) decking, even 121 mm is on the large side. I probably have about 5 mm gaps now after laying the decking in the spring. And by winter, the gaps are likely to be even larger. If I had laid with 126 mm, the gaps would be about 1 cm now... and I think that's too much...
 
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Holger Gross Holger Gross said:
Hello, I apologize, edge-to-edge distance 26 mm should of course be 126 mm. The number 1 was omitted.
So you mean 6mm between the decking boards.
 
Will soon be laying decking and wondering how on earth to know if it's soaking wet, wet, or dry.

At the builders' merchants I have nearby, there's usually half a stack of pressure-treated, I've never seen a whole stack of freshly treated boards...
They could have been there anywhere from a week to a month.
I have a deck where there are almost never any gaps because I laid it closely with fairly dry decking, and I don't want that again, but I also don't want the foot to slip between the boards...

If you were to aim for 124-125mm instead of 126, maybe that would be good?
 
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nino nino said:
Going to lay decking soon and wondering how on earth to know if it's soaking wet, wet, or dry.

At the hardware stores near me, there's usually half a stack of treated wood; I've never seen a whole stack of freshly treated boards...
They could have been standing there for anywhere from a week to a month.
I have a deck where there are almost no gaps because I laid the boards tight with fairly dry decking, and I don't want that again, but I also don't want the foot to slip between the boards...

If one aimed for 124-125mm instead of 126, would that perhaps be good?
I think you can usually feel it quite easily both by the weight of the board, but also by the color and sometimes the smell.
Moreover, when you start screwing it, you'll notice if a lot of liquid comes out.
Then you can measure the width of them; the wetter, the wider.
 
On the topic of Biltema's screws and the burden of proof from Råd & Rön
 
  • Magazine page discussing Biltema screws and consumers' experiences with renovations, featuring a cartoon illustration of a woman sewing.
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It's interesting how ARN works. A bit like a real court. I myself have won a dispute about a car with ARN. What led to my success was hiring an independent expert. What she with the decking screws should have done was to consult a structural engineer or building inspector and pay them to carry out an investigation of both the construction and the screws. The problem is obvious. No one wants to pay five thousand kronor for a statement that might indicate they are the cause. If you win such a dispute, the opposing party covers the expenses, provided they follow ARN's advice and the expenses are reasonable.
 
M MickeMörkö said:
It is interesting how ARN works. A bit like a real court. I myself have won a dispute over a car at ARN. What led to my success was hiring an independent expert. What she with the decking screw should have done was to consult a structural engineer or building inspector and pay them to conduct an investigation of both the structure and the screw. The problem is obvious. No one wants to pay five thousand kronor for a report that might state that they themselves are the cause. If you win such a dispute, the opposing party covers the expenses, provided they follow ARN's advice and that the expenses are reasonable.
What is strange in Sweden is that it is voluntary to follow ARN's decisions; it should be mandatory.
 
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