Concrete screw

[Blåbär69]

I have three questions about concrete screws as I have never used them before.
I am planning to install an interior door frame with concrete screws. Closest to the frame, there is a layer of red bricks, and behind them, the rest of the wall is made of lekablock.
The questions I have are:
1. Should I try to drill into the mortar between the bricks or directly into the bricks?
2. How deep should I drill for proper anchoring?
3. What drill size should I use? There is no indication on the package except that the screw is 7.5 mm. Should I drill with 6 mm or maybe 5.5 since the hole usually ends up being about 6 mm?

 

[SBH]

preferably in the stone
5mm longer than the screw
6mm drill
however, the manufacturer might say otherwise

 

[Blåbär69]

Thanks for the quick response.
I obviously expressed myself a bit incorrectly on question two.
I was thinking more about how long the screw needs to be or, perhaps more accurately, how far the screw needs to go into the wall to provide sufficient anchorage for a door frame? Do concrete screws hold as well, worse, or better than an equivalently long screw and plug?
Considering it's a row of stones (approx. 6 cm), and then LECA blocks, should I go through the stone and into the LECA a bit to avoid strain only on the stones? Am I overly worried now or?

 

[SBH]

do you use these?
https://www.google.se/webhp?sourcei...nSE583SE583&ion=1&espv=2&ie=UTF-8#q=karmhylsa

 

[Blåbär69]

No, I was just thinking about a concrete screw. For example, Biltema's. http://www.biltema.se/sv/Bygg/Fastelement/Skruv-och-Bult/Varmforzinkat-galvaniserat/Betongskruv-50-st-191580/

 

[SBH]

it depends a bit on how deep the drill head goes.

but with a 70mm screw, you want 60mm of the screw in the stone. then you should get about 1kN in both tensile and shear working load

 

[Blåbär69]

Ok, upon further reflection, it turns out that I have nothing "behind" to worry about, so if I use a slightly longer screw than necessary, no harm is done. As long as I make sure to drill at least half a cm deeper than where the screw will go. I'll be a bit on the safe side, and it should be fine.
Thanks for the help.

 

[byggolle]

Door frames are fastened with frame screws. Concrete screws tend to spin when used in brick, leca, or mortar as they are much more porous than concrete. You should use plugs instead. Or use adjufix sleeves and fasten them with a light concrete screw, also called a lecaskruv.

 

[SBH]

Door frames are secured with frame screws. Concrete screws tend to spin if used in brick, leca, or mortar since it's much more porous than concrete. You should use plugs instead. Or use adjufix sleeves and screw them in with a light concrete screw, also known as a leca screw.

Concrete screws work in brick. However, not in the joint.
You can usually get at least 1kN if you do it right.

 

[MathiasS]

For essve's frame sleeves, their concrete screws in brick should be used.

 

[Hubbe2]

Concrete screws should be used in concrete, not in brick or aerated concrete.
Aerated concrete screws should be used in aerated concrete.
Since you have a layer of brick before the aerated concrete, I would recommend drilling and plugging.

 

[MathiasS]

So when using Essve's Induproggar for frame installation, you can choose to either follow Hubbe's advice on their products or follow Essve's advice on their products (and use their concrete screws in brick). Optional, of course!

 

[verktygsgurun]

Does it matter if it's hole brick or solid brick? But why complicate it? It's about an interior door... drill, plug, and screw it in place. Goes faster than writing a post on byggahus.

 

[SBH]

Concrete screws should be used in concrete, not in brick or aerated concrete. Aerated concrete screws should be used in aerated concrete. Since you have a layer of brick before the aerated concrete, I would recommend drilling and plugging.

different concrete screws exist. check what they can handle. essves concrete works in brick