Hi all,
I searched for existing threads and while there are other SVP condensation issues, none have quite this problem.
In our bathroom, there is a riser built into the wall which has had mould developing for several months- wipe it off and it soon comes back. It is also now 'blowing' the plasterboard out. Inside the riser is a SVP which terminates in the loft and has condensation all around the top of it. The loft is insulated but fully ventilated at the eaves etc. There is no water or anything at the bottom of the SVP itself and I have checked under the FW manhole and there's nothing untoward. All taps, plugs etc drain normally. What I think may be happening is that the warm air inside the SVP from all the hot water etc in the drains is meeting the cold outdoor air in the loft causing condensation on the exposed top few inches and then running down inside the riser, causing mould to come through. House is mid 1980s, single story if that is relevant.
Does anyone concur with my theory, or have an alternative and does anyone have any idea how to stop this?
Thanks all,
1.
2.
3.
4.
I searched for existing threads and while there are other SVP condensation issues, none have quite this problem.
In our bathroom, there is a riser built into the wall which has had mould developing for several months- wipe it off and it soon comes back. It is also now 'blowing' the plasterboard out. Inside the riser is a SVP which terminates in the loft and has condensation all around the top of it. The loft is insulated but fully ventilated at the eaves etc. There is no water or anything at the bottom of the SVP itself and I have checked under the FW manhole and there's nothing untoward. All taps, plugs etc drain normally. What I think may be happening is that the warm air inside the SVP from all the hot water etc in the drains is meeting the cold outdoor air in the loft causing condensation on the exposed top few inches and then running down inside the riser, causing mould to come through. House is mid 1980s, single story if that is relevant.
Does anyone concur with my theory, or have an alternative and does anyone have any idea how to stop this?
Thanks all,
1.
2.
3.
4.