I am going to attach 2 pieces of 2-meter cable ducts resting on a window sill. The duct is 15x10 mm and the wall is made of plasterboard. Unfortunately, I don't know if it is double or single plasterboard, I hope for double plasterboard since it is against an outer wall, but it is a local builder who did it, so I don't know at the moment.
Would it be sufficient with ordinary sheet metal screws with dimensions 4.2x19 and with a countersunk head? Or do I need to use plaster anchors with screws? Please suggest options from Biltema's selection as I am going there to buy the ducts anyway.
I am mainly thinking about the one in the picture. A drywall panel is 13mm thick, and two would therefore be 26mm. So, 4.2 x 25 should be suitable as it covers both single and double drywall on the wall.
It seems to only be available in a 250-pack. But you can probably find it in another store where they have fewer than that.
Well, it might not matter a lot which screws to use for such a small strip, I found these cheaply at Ö&B.
The strips have double-sided tape, but in this case, I imagine you will be replacing the lights twice a year with Christmas stars/regular ones. In my experience, self-adhesive strips tend to detach from the wall rather than open up?
Sure, it works with those. I have set some with drywall screws, as long as you do not tighten the screw too hard, it works fine with whatever.
However, I don't trust those with double-sided tape either. Too often those fall down again. Maybe less risk with such small moldings, but what harm is there in putting in a few screws so you know it stays there.
Some adhesive cable trays stick too well, it can be a nightmare to remove all the foam/glue residues. I now screw my trays, considerably easier to fill a few holes if you need to remove them.
The glue gun works well!
I have attached a whole bunch of moldings with it and they hold. It is possible to remove them with a utility knife and then just peel off the glue if needed.
I think mounting screws work better than those with countersunk heads in cable ducts. A box of 250/500 screws costs 2-3 times more than smaller bags with 20-30 screws, and soon you'll have a small screw stock with different sizes. Good if you live in a house, in an apartment maybe a bit overkill.
Take a screw with the coarsest thread possible and add a little saliva (or water) on it before screwing it into the drywall.
When it dries again, it fits really well.
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