anchoring to a solid floor - screed problem?

mk2phil · 11 Feb 2009

Hi there,

I want to drill a few anchors into my living room floor. It's solid, and so I assume it will have a screed on top before the actual concrete itself. If this assumption is correct, then I imagine that it will just crumble away if I start drilling into it.

So how can secure some anchoring bolts into a solid floor that has a screed?

Am I even vaguely right with these assumptions?

Thanks in advance

Softus · 13 Feb 2009

If you reveal the closely-guarded secret of the thing(s) that you want to fasten to the floor, then it will be easier to help you.

mk2phil · 13 Feb 2009

I want to extend the chimney breast outwards slightly so I cant sink a plasma into it. So I'm planning to build a wooden frame which I'll later plasterboard. I'll screw the top of the frame into the ceiling joists, sides into the wall, but how best to secure the floor sections is the problem.

Softus · 13 Feb 2009

6mm Rawl-type plugs and screws into the screed will provide as much strength as wood screws into the ceiling joists, and the average screed will be deep enough to do this.

Anchoring into the substrate below the screed would be overkill, IMHO, unless the screed turns out to be very thin or very crumbly.

mk2phil · 13 Feb 2009

I've got a feeling it might turn out to be crumbly.

Is the purpose of the screed just to give the finished level of the floor that cant normally be achieved with just concrete alone? If so then I might as well dig out a small section where it's crumbly, fill it with concrete and then drill into that. For such a small section I can make sure the concrete will be as level as the screed.

What do you think?

Softus · 13 Feb 2009

mk2phil said:
I've got a feeling it might turn out to be crumbly.

Then just drill deeper and use longer screws.

mk2phil said:
Is the purpose of the screed just to give the finished level of the floor that cant normally be achieved with just concrete alone?

Pretty much, yes.

mk2phil said:
If so then I might as well dig out a small section where it's crumbly, fill it with concrete and then drill into that. For such a small section I can make sure the concrete will be as level as the screed.

What do you think?

I think that simply won't work.

mattysupra · 13 Feb 2009

just drill into the floor!If it crumbles then dig out a section and fill with cement or mortar.

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anchoring to a solid floor - screed problem?

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