carlosdeanos Posted January 13, 2021 Share Posted January 13, 2021 Hello, I have a concrete slab floor in an extension. Top layer is concrete, so the insulation is underneath. Original plan was to screed and put heating pipes in to bring the floor up to existing floor height. Now, I have left about 100mm to get the concrete up to existing, more than i hoped. Building control have also told me screed is a tough one to DIY. I asked if i could run joists on the concrete (as its damp proof) then board over, (I would insulate between and put my pipes in there) but they didnt like the idea. They suggested i use poly floor sheets to bring it up, then undefloor heating board (With the pipe runs built in) to match existing floor boards height . Do you think this is the best soution or does anyone have any other ideas? Thanks very much. Picture to help - Link to comment Share on other sites More sharing options...
TonyT Posted January 13, 2021 Share Posted January 13, 2021 can you remove suspended timber floor and renew the whole slab for both rooms? adding the UFH into the new Slab? 1 Link to comment Share on other sites More sharing options...
carlosdeanos Posted January 13, 2021 Author Share Posted January 13, 2021 @TonyT I guess so? Thing is the extension runs across two rooms, the lounge and the kitchen. Would i need to get more concrete to do that? You can probably tell this is just me completing the work. Thanks. Link to comment Share on other sites More sharing options...
Gone West Posted January 13, 2021 Share Posted January 13, 2021 Link to comment Share on other sites More sharing options...
carlosdeanos Posted January 13, 2021 Author Share Posted January 13, 2021 2 minutes ago, PeterStarck said: Seems to be concrete there. Link to comment Share on other sites More sharing options...
Gone West Posted January 13, 2021 Share Posted January 13, 2021 1 minute ago, carlosdeanos said: Seems to be concrete there. If so then can't you remove the joists and increase the height with EPS/PIR to match whatever the extension is going to be. Then run the UFH over the whole area. 1 Link to comment Share on other sites More sharing options...
carlosdeanos Posted January 13, 2021 Author Share Posted January 13, 2021 7 minutes ago, PeterStarck said: If so then can't you remove the joists and increase the height with EPS/PIR to match whatever the extension is going to be. Then run the UFH over the whole area. Thats a good shout. I think it will need damp proofing but i guess thats just a DPM layer then. I will have a look - thanks. 1 Link to comment Share on other sites More sharing options...
JFDIY Posted January 13, 2021 Share Posted January 13, 2021 1 hour ago, carlosdeanos said: Now, I have left about 100mm to get the concrete up to existing, more than i hoped. Is it the area with the chair on? A layer of 25mm or 40mm insulation then clip your pipes to it and screed to finish level. Get someone in to either liquid or traditional screed, you'll be glad you got someone else to do it once you price the cost of materials. As others have said match the other area with insulation 1 Link to comment Share on other sites More sharing options...
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