Floors

Even though heat can be lost through suspended ground floors (floorboards on joists), it is questionable whether it is worth the effort of insulating them - unless you are having to replace floorboards anyway. Usually a good quality carpet combined with underlay or other floorcovering laid on hardboard is sufficient to minimise downward heat loss.

Gaps below skirtings can be filled with mastic or covered with wooden beading, pinned to the skirting rather than the floor so the floor is allowed to move (12).

Never block up the air-bricks in outside walls. The airflow beneath a suspended wooden floor is essential to keep the wood dry and free from rot.