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SteveD50

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Firstly, Hi I'm completely new to this forum and woodworking forums generally, so hello from me.

So here it is, concrete sectional garage circa 1970, structurally sound and now after some minor repairs to the roof and fillets watertight but mildly damp base due to lack of DPC when original slab was laid.

Im going to insulate fully inside using celotex and framing add barn doors and clad the exterior, the only real issue is the DPC on the floor once this is laid i'll need to put fixings through it to secure the battens for the flooring and the side rails for the framing, this means i'll be punching quite a few holes through, I would think making it pointless...any ideas how the dpc can be laid intact when you need to fix wood to the floor?

Any help, advice, previous experience, words of wisdom greatly appreciated...

Thanks,
Steve
 
Why do you need to fix the flooring down?
Surely it will reach to each wall and have lots and lots of heavy stuff sitting on it?
Fit the DPC just like a swimming pool liner. all across the floor and high enough up the wall to stop damp from any outside soil seeping through.
 
Hi,

1) Have you considered a liquid DPM instead of a sheet one? e.g. SynthaPrufe or similar?

http://www.ikogroup.co.uk/Products/Stru ... -Original/

2) I don't think that a few fixing holes through such a DPM are likely to be a problem - unless at some time/season there's hydrostatic pressure pushing groundwater upwards (if there is, then you need to rethink anyway I guess).
3) I'd question how many fixings you need to put into the floor slab, because:
a) As previously said, gravity is your friend in keeping your new timber in position;
b) You have no real clue as to the quality (thickness - probably variable, strength - probably un-reinforced etc.) of the existing slab anyway

Cheers, W2S
 
Just put a 1000 gauge DPC on the floor, then Celotex, then another 1000 gauge DPC, then chipboard or some other flooring of your choice. Sit (but don't fix) your timber framing on top of that. Attach timber framing to walls only.

There is a thread on here somewhere of a concrete sectional garage conversion to insulated workshop.
 
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