Wood fiber board wind protection layer to floor.

Before the cellulouse insulation can be put in we needed to seal the underside of the floor. This we did by fitting 28mm wood fibre board to the underside of the floor joists. The wood fibre board carries the insulation acts as a wind protection layer and minimizes cold bridging.

Little people off to work.

Spring time

Ground floor from inside with fitted wood fibre board on the left

Also the outside edge of the 400mm deep floor needs to be sealed. Here we used 12mm bitumen impregnated wood fibre board, this can get a bit wet without suffering permanent damage. Also we fitted some of the floor insulation which would be difficult to access from the inside and almost impossible to do a good job on once the wood fibre board is fitted.

Outside edge of floor with wood fibre insulation.

We fitted extra strips of board at the base of the straw bale wall to stop any air leakage where the floor meets the wall.

Bitumen impregnated wood fibre board.

At the top of the wall where it meets the roof we also had to fit 12mm wood fibre board to close this junction. This was quite a challenge as it is an awkward spot and the board needed to be shaped to the round wood rafters.

 

Floor from underneath the house.

 

The underside of the floor we then covered with 4"x1"s screwed with 6x90mm stainless steel screws. these boards support the weight of the insulation and protect the wood fibre board from being damaged. Small animals like to use it for building nests! We will treat them with wood tar paint later.