Canski Posted October 20, 2022 Posted October 20, 2022 2 hours ago, Nickfromwales said: Hope you're going with Beamshield / other for that B&B deck? Cold ventilated sub-floors are the last option if I specify a foundation system for a client!! Nope, I think I will be going with Litecast GT Same but different.
Kelvin Posted October 20, 2022 Posted October 20, 2022 3 hours ago, JohnMo said: Not correct, from the marmox data sheet. 0.065m/0.078W/mK = 0.8mK/W convert to U value, 1/0.8=1.25 From the other datasheet 0.215/.15 W/mK = 1.43mK/W convert to U value, 1/1.43=0.7 Thermolite is in fact nearly twice as good for reducing the heat loss, even with a worse conductivity. Because they are 215mm high compared to 65mm. It's the size that matters! That's old data. The current thermal conductivity (according to the info I have) is 0.047W/mk which gives a U value of 0.72. In terms of the Thermolite block the compressive strength and dry density also matter. As far as I can see the Thermolite block with 0.15 W/m.K doesn't have either the compressive strength (3.6N/mm2) nor the density (600kg/m3) that's been specified for my build for example (7N/mm2 & 730kg/m3)
Canski Posted October 20, 2022 Posted October 20, 2022 Just now, Kelvin said: That's old data. The current thermal conductivity (according to the info I have) is 0.047W/mk which gives a U value of 0.72. In terms of the Thermolite block the compressive strength and dry density also matter. As far as I can see the Thermolite block with 0.15 W/m.K doesn't have either the compressive strength (3.6N/mm2) nor the density (600kg/m3) that's been specified for my build for example (7N/mm2 & 730kg/m3) They make 7N/mm2 thermalites density of 730kg/m3 U value 0.18 W/m.K
Kelvin Posted October 20, 2022 Posted October 20, 2022 50 minutes ago, Canski said: They make 7N/mm2 thermalites density of 730kg/m3 U value 0.18 W/m.K Yep got all the data on the various blocks. Just need to make a decision on what to do.
JohnMo Posted October 20, 2022 Posted October 20, 2022 1 hour ago, Kelvin said: That's old data. The current thermal conductivity (according to the info I have) is 0.047W/mk So they come with roughly the same u value, one is cheap, one isn't, your money your choice
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