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Showing results for tags 'sand'.
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Is this right? Dry sand density between 1520-1680 kg/m3 (say 1500 in the calculation below) Course sand, dry, specific heat capacity is about 800 Joules per kg per degree of temperature change. Course sand, dry, thermal conductivity 0.25 W/m K 1kWh equals 3,600,000 joules And therefore, ignoring all factoring of energy loss due to energy conversion etc(what I call "in theory"): Heating up 1kg of dry course sand would be: 450 degrees temperature change times 800 specific heat capacity times 1kg in weight, divided by the amount of joules in one kWh: 450 x 800 x 1000 / 3,600,000 = 1 kWh.
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We have the foundations out of the ground and have infilled with crushed concrete. The next layer, to protect the dpc, is sand. We have laid sand over the whole of the foundations to a depth of approx 10mm it might be deeper in some places and shallower in others. The Building Inspector has just visited and told us that he thinks it is too deep. He did not say it in a way that meant we had to change it. What do others think? Is he saying it for something to say or do we really have to tamp it all down? What will happen if we leave it at that depth? I would have thought that the concrete pour over the dpc would do the job of flattening it down?
