HoneySuckleDreams Posted September 29, 2013 Share Posted September 29, 2013 HelloWe are just about to embark on renovating a bathroom. The floor is already tiled (concrete substrate) and we intend tiling over with new tiles. However, I want to install an electric underfloor heating mat of about 4m2. Is there anything I can buy in France similar to the 10mm Warmup boards you can get in the UK? Thanks Link to comment Share on other sites More sharing options...
woolybanana Posted September 29, 2013 Share Posted September 29, 2013 There was something like it on offer on Bricodepot a couple of weeks ago. Link to comment Share on other sites More sharing options...
Chancer Posted September 29, 2013 Share Posted September 29, 2013 The problem that you would have is that it would make a thin unstable substrate apon which your new tiles would probably crack.I have used the green compressed wood fibre 7 or 8mm brico insulation under my heated floors but I have used laminate flooring above so no cracking issue.One thing I have found, learning by my mistakes as ever is that whilst the mats can be laid directly on the insulation and the laminate directly on top the heat transfer and response time is far inferior than if the mat is skimmed first with ragréage. Link to comment Share on other sites More sharing options...
Théière Posted September 30, 2013 Share Posted September 30, 2013 Something like Marmox boards? is sold in bricodepot and Wedi board in Lapeyre etc. it provides a very strong surface for tiling on to. Link to comment Share on other sites More sharing options...
Yonner Posted September 30, 2013 Share Posted September 30, 2013 I too installed electric u/f heating in our bathroom andshower room here in France.The key thing I would consider if I was in your positionHSD, is the level of insulation below the electric heating pad/webbing. We lose a significant amount of heat from the systemdownwards, because we were limited to about 10 mm of hard foam insulationbeneath it – beneath that is a thick concrete plinth over a cellar. I removedthe old tiles and adhesive to give me that 10mm “gap” but if I was to installagain, I would want much more insulation and a reflective surface below thewebbing.With regard to cracking, we have suffered from that, but nowI’m more experienced, I know that there are much better flexible adhesivesavailable, and having used these on other projects, know that they would solvethe problem – Porcelanosa do an excellent one for example.If the u/f heating was our only source of heat in the rooms,we’d be disappointed in winter months. I’mnot sure if its simply because of the lack of insulation underneath, but thetiles are warm, not hot, and it takes a whileto achieve that. So I’d encourage lifting the tiles, insulation as much aspossible, and getting the benefit. Link to comment Share on other sites More sharing options...
Angie Posted October 10, 2013 Share Posted October 10, 2013 We did exactly the same as you. Had old tiles on top of concrete floor; used Marmox boards (which cost almost as much as the actual u/f heating mats!) and then laid the mats followed by the new tiles. These have been down for 5 years now with no cracking or movement whatsoever. The initial heat up took around 2 hours but they stayed continuously very warm. The main electricity cost is in the heating up from scratch but the Marmox boards reduce this time considerably, however, we don't turn ours off at all now, its on 12 months of the year, 24/7. Thermostat set at a constant 25oC in an adjacent room and it costs virtually nothing to use because I assume as its on all the time we don't have the cost of this "heat up" each day - even in the summer its nice to get out of the bath onto a warm floor. Link to comment Share on other sites More sharing options...
basquesteve Posted October 11, 2013 Share Posted October 11, 2013 I'm interested in the virtually next to nothing cost 365 days at 25 degrees How much is it Link to comment Share on other sites More sharing options...
Benjamin Posted October 12, 2013 Share Posted October 12, 2013 [quote user="basquesteve"]I'm interested in the virtually next to nothing cost 365 days at 25 degrees How much is it[/quote]Having seen it the first time around I'd assumed it was a typo but on reflection maybe it wasn't.Having owned a well insulated modern built French house (less than 10 years old) I wouldn't have dreamed of leaving heating on all year long.I know the costs of keeping warm and comfortable with electric u/f heating so it will be interesting to see how much next to nothing is. Or is cost all relative to your circumstances? Link to comment Share on other sites More sharing options...
basquesteve Posted October 13, 2013 Share Posted October 13, 2013 Most areas in France I am sure have an average temperature well below 25 degrees, even in Summer for the most part to keep a wet/damp area at this temperature must have a cost let alone the remaining 4 months when it never exceeds 9 degrees, lets forget the sub zero extended periods Link to comment Share on other sites More sharing options...
Chancer Posted October 14, 2013 Share Posted October 14, 2013 Lets not forget that the thermostat is in a seperate room [:-))][8-)]That 800 watts of UFH certainly has its work cut out.25° [:-))]Glad I am not paying. Link to comment Share on other sites More sharing options...
Rabbie Posted October 14, 2013 Share Posted October 14, 2013 I, for one, would find 25C unpleasantly warm. The heating bills would not improve my comfort either[:)] Link to comment Share on other sites More sharing options...
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