I use polytheen dustsheets when replacing rads o trv's ect, one 12x12ft does like 2 rads change easily if you cut them in half and that's if you triple layer them up. masking tape them to the skirting behind the rad and cut them so they fit around the pipes feeding the radiator then masking tape the dustsheet to the pipe. tidy job, no spills thru to the carpet and once you finished you can wrap all you rubbish up in them and chuck away! and at £23 for a pack of 10 in TRAVS PERKIS!!!!! ( enough to do 20 rad changes approx.) id say they are a bargain. I don't like dust sheets after they get whet , they smell of amp and look awful!! that's my opinion anyway, if you masking tape them to the skirting no dust will get behind onto the carpets when drilling!