Go to Forum Home › Building Refurbishment and Retrofit › Floor Insulation – Help needed
- This topic has 3 replies, 4 voices, and was last updated 11 years, 11 months ago by Nick Grant.
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- 12 April 2012 at 8:47 am #31665
Morning
We are building a new house, we have a bit of an issue / query for the floor construction and was wondering if anyone had come across it had a solution.
Basically the ground floor will be a solid slab with underfloor heating. So we have a finish which is a 75mm reinforced screed. But we want to get 300mm of insulation into the floor and are wondering where its best to put it. Has anyone put 300mm of insulation under a floor screed. I'm just worried about the potential of crack due to compression and movement of that much insulation.
I'm thinking the best solution is to have 200mm insulation then a floor slab then 100mm of concrete followed by the screed.
Any help much appreciated. Confused ??? - 13 April 2012 at 7:53 am #38513Anonymous
Hi Darren
I used an insulated reinforced concrete slab in my build. It was supplied by Isoquick and has 300mm thick base insulation and 200mm thick upstand insulation. The reinforced concrete slab is 200mm thick. I don't have underfloor heating but I would have thought a 150mm concrete slab with 50mm self levelling screed would be OK. - 16 April 2012 at 10:48 pm #38514
Look at
http://viking-house.co.uk/passive-slab-insulated-foundations.html
no problem - 22 May 2012 at 5:57 am #38515
I'd consider putting the pipe direct in the slab but with these levels of insulation I assume the building is Passivhaus. This means you won't want the floor to be warm, just a degree or 2 above room temperature but that's another discsussion that I think is somewhere on the forum!
Nick
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