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I introduced myself about a month ago under the heading New Summerhouse. I had some interesting exchanges on solar panels to power underfloor heating in the summerhouse. I have now rejected this option in favour of a north-facing sloping roof (thus getting 3 metres of height at the south-facing patio-door-lined side) with no solar panels, and powering the underfllor heating from the mains. I've been to B&Q and looked at the sheets of underfloor-heating insulation sold there, which seem to be pink poystyrene 1 cm thick with a grey coating to each face. Is there a more eco-friendly alternative, perhaps on the lines of the shredded-paper insulation available for lofts. Perhaps not, as anything underfloor will get walked on/compacted and lose insulting capabilities. Fran