What length should I have on the nail plug if I am fastening a 45mm thick sill to a concrete floor?
 
120mm should be fine and more than enough;)

Best regards
 
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Is it an exterior wall or interior wall?
Do you have underfloor heating?

For an interior wall, 90mm is good enough, I personally drill 30mm down into the concrete to make sure I don't hit any underfloor heating. Then it depends on how thick the concrete is and a few other factors...
 
Used 8x80 in the concrete ceiling myself, for my 45mm studs. Buy them at Beijers Bygg, as they cost half the price compared to Silvans, same brand and nail plugs.
 
Why do you use spike plugs?? I always use M8 Expander for the outer wall studs, even inner walls. If you follow the drawing, you should never need to hit any underfloor heating pipes;)
 
monsterbyggare said:
Why do you use nail plugs?? I always use M8 Expanders for outer wall studs, even inner walls. If you follow the drawings, you should never hit any underfloor heating pipes;)
Why? Because it's convenient to just drill a hole and insert the plug, and it's done, saving time. I don't know the price, but I guess nail plugs are cheaper than expanders.

In a new house, there typically shouldn't be underfloor heating under the walls, but it can still happen (someone might have measured incorrectly). Additionally, the supply and return have to go somewhere, and these could very well be where you drill. My tip is to never drill deeper than 3 cm when mounting an inner wall. An outer wall is another matter, there you can dare to drill a bit more.
 
There is no underfloor heating where I will drill, it's a garage. I think I'll use Nail plug 8x100, gold chrome from byggmax.
 
With an expander, you also only drill holes (in both wood & concrete) and then insert the expander, place a large square washer so the nut doesn't pull into the wood. It's more durable than nail plugs in my experience, but that's just my opinion...
 
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