Under floor insulation and heating

I've got some lovely photos from John showing how he insulated between the joists and then added underfloor heating on top.

For anyone who is considering just insulating between the floor joists, maybe with underfloor heating as well, take a look!

This is just one system - another case study to follow soon will show a slightly different approach.



Electric cables may be higher in the joists than 70mm, so cut the battens at that point. A groove may need to be cut in the underside of the foilboard in some cases.



A little wooden jig (by nail tub) ensures battens are fixed at a uniform depth of 70mm (i.e. 50mm for the board, 15mm for the barrier pipe and 5mm tolerance).



The battens are being cut ready by nailing along joists.



The foilboard has been cut and laid leaving 15mm of the joists above it ready to receive the spreader plates.



The spreader plate sits neatly on the joists ready to receive the barrier pipe. One side will go "away" and the other "back". Though not cheap, the spreaders will ensure a nice even heat and increase efficiency by at least 20% compared with overlay board. This is also useful when thicker flooring is used (say 22mm rather than 18mm).