I have a large single brick outhouse in garden. Two walls of this (top and side) are incredibly wet and mouldy. I have dried and cleaned, and applied tanking slurry to stop water ingress -(both walls are potentially below ground level but on neighbours property so can't check)
I have tanked slurry it which seems to have worked but the outhouse overall gets large amounts of condensation on all cold walls
Would insulating help? If so, what's the best way? Insulated plasterboard? I'm concerned about affixing anything -such as battens- as that would just soak up the mositure and then make walls worse?
I'm not going to be in the outhouse much but would like to store things without fear of them getting mouldy etc
Are you a tradesperson and able to answer this question?
This would need to be treated as a garage conversion would be, below is order of works.
Treat internal walls and floor with RIW bitumen sealant , minimum 2 coats.
Create studd partitions with a gap of 50mm from the brickwork (it would not hurt to lay a DPC below this
install celotex or equivilant insulation (normally 75-100mm) between the studs
Use a moisture resistant plasterboard over the studdwork
Skim.
I hope this helps
Hello mate sorry to hear this it sounds like you need more airflow have you tried installing air bricks to see if this helps if it's a sealed room it's still does need to breathe hope this helps .
If there it’s a access it will need to be investigated treated from the outside rather inside , also the dump course membrane on the brick wall needs to be investigated lower level and also upper level if there it’s any dump proof at all in place
http://www.builderdepot.co.uk/hydro-insulated-tilebacker-board-20mm-x-600mm-x-1200mm.html
Dot and dab these with tile adhesive. Dont skimp and go for the 6mm. But make sure the walls are free from condensation first. The tanking should have stopped the ingress of water but a single brick wall that is exposed is prime for condensation.
The boards are cement faced with foam insulation between. Keep the dabs thin and small, This makes a smaller heat sink to the outside.
These boards can be skimmed and if its just an outhouse... Have some fun and try it yourself.
You do Not want to use plasterboards. You will be growing some new form of penecillin very quickly
