A
Alfred Jonsson
Banned
· Västra Götaland
· 208 posts
Alfred Jonsson
Banned
- Västra Götaland
- 208 posts
80mm sounds good.
No, I just meant that if you place a 45 side against another 45 side, it becomes 90 together, then an 80mm screw is adequate.nixxz said:
If you had placed a 70 side against a 45 side, it would have been 115, and therefore a 100mm screw would be appropriate.
Or 70 side against 70 side becomes 140, suitable with 120 screw (I don't know if there is a 130...).
The tricky part when screwing such things is that the unthreaded part of the screw is often too short, or conversely, that it is threaded so much, and when the thread is left in the stud you are trying to tighten, the screw doesn't hold as well.
An alternative then is to pre-drill the stud you are attaching, so that it is pulled in by the head. The pre-drilling should not be larger than the screw's diameter, it should be a bit tight, but ensuring you get a good tightening effect. This tends to occur more easily/often when using countersunk screws, which easily go into the wood.
Generally, 2/3 of the screw should be in the fixed part. That is, if you're screwing through 45 mm, the screw should go 90 mm into the component behind. If you don't have that much behind, use as long as there is space for, but remember to pre-drill because otherwise the wood won't tighten properly since the threads of the screw will grip both what you're fastening and the component behind.
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Is that so?thomasx said:
I have the impression that the rule of thumb for nailing is that the nail should penetrate twice as deep into the backing material as what you are nailing in.
Shouldn't screws work with less depth?
Otherwise, I also think that 5x80 or 6x80 seems to suit TS quite well. 5 or 6 mm depending on how much force is involved, but for 6 mm it might be good to drill a pilot hole with 3 or 4 mm if it's going to be screwed near the end grain to prevent splitting.
Okay, planning to go with 6*80, I don't think I need to pre-drill since I'm not going to screw too close to the edges.
But I think it's bad of the lady at XL not to know more, and if she felt unsure she could have asked someone else in the store.
But I think it's bad of the lady at XL not to know more, and if she felt unsure she could have asked someone else in the store.
For nails, the recommendation is 2.5 times the thickness of what you are fastening to be secured in the backing wood.
Beijer bygg thinks 50/50 is sufficient for screws. However, it can be noted that many wood screws are threaded 2/3 of the length. Not without reason
Beijer bygg thinks 50/50 is sufficient for screws. However, it can be noted that many wood screws are threaded 2/3 of the length. Not without reason
I usually go with double the length of what I'm fastening as a rule of thumb. But there are many factors to consider depending on what is being fastened, the load, and the distance between screws on what needs to be fastened. For certain joints, I also recommend using glue in combination with screws, a method that is unfortunately used too rarely if you want a strong construction.