gyn_paul Posted May 11, 2010 Share Posted May 11, 2010 What would be the ideal mix for screed for u/floor heating... I'm going the 'sand-castle dry' rather than 'self-levellingly sloppy route' .. Also any recommended additives?p Link to comment Share on other sites More sharing options...
Simon Posted May 11, 2010 Share Posted May 11, 2010 Thinner is more efficient, but will need a plasticizer. Check out the IPPEC website FAQs.RegardsSimon Link to comment Share on other sites More sharing options...
broy Posted May 11, 2010 Share Posted May 11, 2010 Thinner heats up quicker but cools down quicker as well. Link to comment Share on other sites More sharing options...
gyn_paul Posted May 22, 2010 Author Share Posted May 22, 2010 We couldn't get anyone to pre-mix and deliver a 5:1 dry load on a truck (it would have been too dry to go in a pre-mix mixer), so in the end we hand-mixed on site.It took 25 tons of sand, about 96 bags of cement, 5 bags of fibreglass strands, 80 sq m of grillage (upstairs) 2 x cement mixers, 10 buckets, 2 wheel-barrows, 5 men, and a lot of tea. It was a r-e-a-l-l-y dry mix which was easy to screed level (it was prepped with joints de dilation - I highly recommend these) but a buggar to mix.It's between 85 and 100mm up top (60 sq m), and about 100mm downstairs (more like 50 sq m: there's lots more stone walls).It took a day for each floor and we are well and truly knackered.Be able to walk on it soon!p Link to comment Share on other sites More sharing options...
Jonzjob Posted May 23, 2010 Share Posted May 23, 2010 Any leaks?[:-))][6]Ours was ready done and we have decided that under floor heating is about as good as you can get!! Link to comment Share on other sites More sharing options...
gyn_paul Posted May 24, 2010 Author Share Posted May 24, 2010 Judging by the temperatures today, I'm wondering how viable it is to circulate the underfloor heating via a heat exchanger in the well. Having the floor at a deliciously cool 8C is a wonderful prospect, but I 'spect I'm just inviting a condensation problem!p In my newly insulated attic it's 28C (admittedly, that's with the windows open so I probably let a lot of hot air in) meanwhile under the black slates the sensor recorded a temperature of 69.4C ! Obviously good stuff that silver foil.Next time I have a little pot of money I'm stripping those black tiles off and swopping them for red PV13's. Link to comment Share on other sites More sharing options...
Jonzjob Posted May 24, 2010 Share Posted May 24, 2010 Be a bit careful as to how cool you take the floor. We were warned when we were looking at geothermal and cool summer stuff that to take the floor temp down more that a few degrees than the outside air temp would cause condensation on it!! Link to comment Share on other sites More sharing options...
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