I'm building a timber garden office and have my footings all built, beafutifully level and square now! (hooray).
My joists are seated on top of a ring of high density blocks with the joists about 300-400mm above soil. (I've compacted it down too, just to make it easier to work there)
The floor will have the following construction:
- vapour membrane (also holds the rockwoll in place)
- joist (with 100mm rockwool)
- vapour barrier
- 18mm OSB (sealed at the joints with mastic or similar?)
I have a whole load of surplus green poly VB and am wondering if it might be worth just placing that over the soil to reduce vapour from the soil interacting with my joists.
Overkill, good idea, bad idea?
I'm going to have some ventilation underneath to allow vapour out of the floor.
I can see that perhaps dew might build up on the VB rather than just sinking into the soil.
If it's not going to be worth putting in that extra VB then I can probably hang on to it to throw over my work on rainy days!
My joists are seated on top of a ring of high density blocks with the joists about 300-400mm above soil. (I've compacted it down too, just to make it easier to work there)
The floor will have the following construction:
- vapour membrane (also holds the rockwoll in place)
- joist (with 100mm rockwool)
- vapour barrier
- 18mm OSB (sealed at the joints with mastic or similar?)
I have a whole load of surplus green poly VB and am wondering if it might be worth just placing that over the soil to reduce vapour from the soil interacting with my joists.
Overkill, good idea, bad idea?
I'm going to have some ventilation underneath to allow vapour out of the floor.
I can see that perhaps dew might build up on the VB rather than just sinking into the soil.
If it's not going to be worth putting in that extra VB then I can probably hang on to it to throw over my work on rainy days!
