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 Post subject: Raising a floor??
PostPosted: Sat Jun 30, 2018 12:59 pm 
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We want to make one of our utility rooms into an office. At present it has a concrete slab floor which will need raising about 5 inches to meet the floor level of the next room. I want to put a vapour barrier over the concrete, put down some joists, insulate it, lay some chipboard on top followed by some carpet.

What I don't quite understand is how to screw the joists to the floor without penetrating the vapour barrier. I have read about floating floors where they aren't nailed down but I fear that if I do this then the floor will be bouncy... :scratch:

Does anyone have suggestions or any new ideas?

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 Post subject: Re: Raising a floor??
PostPosted: Sat Jun 30, 2018 2:31 pm 
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Fix ledger plates either side of the room (fixed to the walls) and hang the joists off of those with Jiffy hangers, insulate between the joists with the material of your choice.

Alternatively it sounds ideal for a floating floor. I'm not sure how the vapour barrier should be installed in that situation though, it won't be good being directly under the insulation and on top of the concrete. Is there no dpm underneath the existing concrete?

One day it will all be firewood.

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