I've taken up some of my upstairs floorboards to install pipes, and am wondering whether it's worth putting some insulation under them before I replace them.
Generally I heat the ground floor of my house, but leave most of the first floor unheated. I notice that the upstairs rooms do get quite warm when the heating is on downstairs.
The floor at the moment is Gyproc ceiling + 20cm gap + 18mm chipboard.
I've seen this "Foil Tec" at Screwfix:
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?_dyncharset=UTF-8&fh_search=foil+tec£125 seems pretty pricey for a sheet of foil, and unfortunately this is a greater quantity than I'd need. Also I can't see where you can obtain the installation clips mentioned on the manufacturer's website:
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it's double sided, presumably to stop heat transmission in both directions, but I'd not be too worried about heat heading "downwards" as I rarely heat the upstairs while the downstairs heat is off.Are there cheaper options available? What do new-build houses use for insulation?