riddellns

I've just lifted my floor boards and noticed that there's a shallow (120mm) concrete slab under the void already, and then a 225mm gab between that and the floor boards. I'm now thinking that filling in the void with a DPM, concrete, insulation and then screed, might not be a bad idea. Or is this a ridiculous idea?

This was my original plan thb, but don't think we've got particularly deep joists. Did you also just encase your cables and other pipework so that the biscuit mix surrounded them? Conduit for example Thanks for the reply

Sorry, does anyone else have any experience doing this with suspended floors, rather than concrete pads?

Cheers. Appreciate the info. Sounds like a great shout. Not sure on the impact of using SLC over timber suspended floors though. Guess as long as there's enough ventilation under the b+b, through to the old suspended floors then there shouldn't be an issue with moisture buildup. Mind me asking what sort of price the wunda over boards were? Some brands a seriously pricey, but they make it look super easy. And was there much build up over the old floor?

Hi And immediately sorry, I know this topic has probably been covered to death thread. We're about to extend our old chalet bungalow, rear extension and first floor extension. The existing floors are suspended timber on most of the ground floor and concrete slab in the porch and front room (as it's an old garage), then the rear extension is going to be block and beam. Upstairs is just timber joisted. We definitely want UFH in the new kitchen/lounge open plan area, and it boundaries the old and new. And also in the bathroom downstairs, and possibly upstairs. We need to insulate between the joists on the ground floor anyway, and I'm just wondering if anyone has experience doing this, and what the most sensible/easiest/cheapest options would be. I appreciate that all 3 of those could well be different, but we're on a fairly tight budget, but don't want to regret not putting it in other areas that are worth it. Hallway for example. I know a lot of companies offer the metal plates, above insulation, but I've seen a few folks on the forum slate them for one reason or another. And I've seen some of the low build up (and we definitely don't want much build up) but some of them are seriously expensive given the area we want to add UFH Lastly, first floor, is there even any point? It'll all be new walls and roof insulation, and I'm hoping the heat from downstairs will mostly heat the upstairs. But if not, if UFH won't add much cost upstairs, then I'd probably rather than than add more radiators into rooms which aren't the largest as is! Thanks