Garage conversion-new floor detail

jstrong · 21 Nov 2011

I have excavated the old garage floor as the area is going to become a habitable space and I have some queries.

I have layed some type1 mot (100mm) and compacted with a wacker, on top of this I am about to lay a thin layer of building sand (10mm).

I have 100mm insulation boards to go in next but was wondering whether to lay a dpm on top of the sand (just a flat sheet without lapping up) then place the insulation on top and then another dpm before pouring 125mm of concrete on top followed by 60mm of screed.

Also what happens to the lapped dpm, does it just get trimmed at finished fllor level?

Any thoughts on my thinking would be appreciated.

melt · 24 Nov 2011

hi
firstly i would be laying a 50mm sand blinding rather than 10mm

the purpose of the sand blinding is so the hardcore does'nt puncture the dpm 10mm might just be pushing the bout out.
dont forget to compact the sand blinding aswell.
I would then lay my 1200 gauge dpm lapping it up the wall and trim to suit later one dpm is sufficient. on top of this i would lay my 2400X1200X100 insulation celotex rigid floor insulation is the best option for this the polysterene cheap insulation i would not touch
on top of the insulation lay your concrete and finish off with your floor screed you may wnt to add a wire mesh to your screed it only being 60mm thick just to give it added strength

mel

jstrong · 24 Nov 2011

Mel
Thanks for your advice.

I've only used 10mm of sand as I had a very well compacted and tight mot layer.

I've layed the 100mm insulation boards along with foil tape on joints and have poured concrete to a depth of 150mm to two of the three shuttered sections. It turns out the screed depth is going to be between 50-60mm thick.

Can I ask do you think it's really neccasary to lay a mesh or will it be ok without?

Many thanks James

melt · 24 Nov 2011

hi james
its not neccasary its usually if your screed is 40mm or below i just apply the mesh or polypropylene fibres sometimes just for that little bit more reinforcement to the floor

mel

^woody^ · 24 Nov 2011

Fibres don't reinforce they control shrinkage cracking.

melt · 24 Nov 2011

and also increases its structural integrity so therefore reinforces as well your quiet right thou it also does reduce cracking and shrinkage all depends what fibres you use polypropylene,nylon,steel

^woody^ · 24 Nov 2011

melt said:
... increases its structural integrity

Is that from Star Trek?

Anyway I doubt it, screed will break just the same in tension, or debond and crack fibres or not

melt · 25 Nov 2011

i think you have been spending to much time with the klingons if you have never heard of structural integrity.

diynot

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Garage conversion-new floor detail

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