| I've been reading up on what's been said previously about suspended | floors insulation and was curious about whether anyone did it - so I | rang a few companys and they all said no. One company told me it | wasn't neccessary as heat rises. | So why do the pictures of heat loss show 15% heatloss thorugh floors? | And why does no one do it?
Because it is hard dirty work. Maybe ?5-10? times the trouble of doing a loft, for probably less return.
I did it and it was *very* hard work, in the crawl space below the suspended floor. I got glass fibre mat as thick as the joists and started putting it up on the floor boards with a staple gun which did not work well. I then held it in place with clout nails in the joists and polypropylene string across/under the mat. Finally belted the clout nails in.
The advantage is mainly in warm floors.