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PostPosted: Fri Jul 27, 2018 11:15 am 
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Hello all,

I need to raise the floor of an existing room to match the others by approx 140mm, the room is suspended and has a reasonable T&G floor but not insulated, is very well ventilated with multiple air bricks and bone dry.

Can I simply lay 100mm insulation slabs onto the existing T&G floor, then tape it all up, and sit some top boards to make up the height to match other rooms?

Do it as a floating floor as per concrete slab method?

My thoughts were, provided that the existing good ventilation is maintained beneath the existing floor there's no difference to what's there already and I benefit from the insulation without needing to spend time / £ on additional timberwork.

What do you reckon?


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PostPosted: Fri Jul 27, 2018 3:04 pm 
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Yes you could do that no problem.

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PostPosted: Sun Jul 29, 2018 3:11 pm 
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Yeah, done that before without issue. Might be a good idea to put some sort of vapour barrier under insulation depending on what's below the floor but it's good enough to hold a floor made me 8 x 2 flooring glued together.

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PostPosted: Wed Aug 01, 2018 3:59 pm 
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Thanks for the feedback.

Things are now developing and I'm looking at the possibility to install Undef floor heating throughout the ground floor at the same time as insulating and raising the floor level of one room by 140mm approx.

Having spent some time searching on best methods etc and coming across conflicting info from Engineering flooring and UFH suppliers, I'm looking at the following set up and would love to hear if it's OK or am I barking up the wrong tree!?

Attached are two images showing that I have to work in two ways...one adding a floating 25 sq/m slab across an existing suspended ground floor to make up the 140mm to reach two other rooms where I need to go between joists to keep the floor as low as I can.

The other two rooms are 20 sq/m each.

I've played around with the Plywoood thicknesses just to balance the end levels, and maintained 70mm on the Celotex.

All comments welcome!


Attachments:
Kitchen & Lounge between joists.png
Kitchen & Lounge between joists.png [ 16.21 KiB | Viewed 285 times ]
Floating floor 130-146mm.png
Floating floor 130-146mm.png [ 22.26 KiB | Viewed 285 times ]
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