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PostPosted: Fri Feb 09, 2018 8:50 pm 
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Ground floor hallway of a 70s house with a suspended timber floor. Work will be done on wiring, plumbing etc. so most of the T&G floor will come up. May as well insulate while there's access.

Question is, where the floor can't come up (under a stair and a toilet), what's the best approach to insulate? Present thinking is where it's up, rockwool on netting, where it's not up, wriggle around and put Celotex between the joists, hard up against the floor boards. ground is pitched slightly so some areas will be a pig to access from the underside anyway.

Does that mixed approach sound sensible?

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PostPosted: Sat Feb 10, 2018 9:35 am 
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Funnily enough I had to do something similar not long ago. Access was really awkward in a couple of places. Cutting celotex tight enough to hold itself in place and then being able to slide it into place without being able to get underneath was almost impossible. What I did was to form a crude frame of lath that served to hold up the insulation. A couple of pieces of lath parallel to the joists supported by shorter lengths skew screwed to the underside of the joists at 90* . This worked to a point but was a problem where joists were not parallel . In that situation I found it easier to slide in a thinner piece of celotex , I had some one inch , and the poke in fibre glass on top . Hope that all makes sense.


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PostPosted: Sun Feb 11, 2018 1:33 am 
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Yes, makes sense.

Foil side up I presume? Hard up against the underside of the boards where you could?

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PostPosted: Sun Feb 11, 2018 9:25 am 
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The stuff I had was foil both sides so didn't matter which way up it went. In the sections of floor I could get under it was pushed up tight to the boards and secured with battery's and nails. On the sections where I couldn't get under it probably ended up more insulated than the other areas as the fibre glass was just pushed in to fill the gap which meant practically the whole depth of the joist.


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PostPosted: Mon Mar 05, 2018 10:37 pm 
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Insulating suspended floors should be considered carefully. Have a read of this, US based articles, but relevant nonetheless:

https://buildingscience.com/documents/i ... rawlspaces


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