Mould and damp after Thermal Lining Paper

Danny30

Hi, I installed thermal lining paper on 3 of the bay windows of our home during the summer but have since noticed problems with mould and damp in my daughters room. The mould is on the skirting boards and areas of the lining paper are damp or wet. I wasn't expecting the damp to be able to be such an issue with the lining paper installed as wall should not be cold. Could it be due to the mould from the skirting boards? Any idea what I should do now? Pics below

rob7475

Did you have the problems in that room before you put the thermal paper up? Does the room have a radiator and is it keeping the room warm?

It can be common to get condensation / mould issues in bedrooms due to the moisture created whilst sleeping, the lower temperature and lack of air flow. Try opening a window for a couple of hours a day or using a trickle vent if fitted. 

PIV or MHVR systems can also massively help with condensation issues

Apodemus

A picture showing a wider view to give context might help.

If this is below a bay window, are you sure that you don't have water ingress somewhere?  What sort of windows are in this room?  How well are they sealed round the frame at the outside?  Was this a botch job by the usual hard-sell cowboys a window company?

Danny30

Hi, Apodemus said:

A picture showing a wider view to give context might help.

If this is below a bay window, are you sure that you don't have water ingress somewhere?  What sort of windows are in this room?  How well are they sealed round the frame at the outside?  Was this a botch job by the usual hard-sell cowboys a window company?

Hi Apodemus,

The area is under a bay window that was installed by previous owners and wasn't installed well at all. I had a handyman doing the gutter recently and he mentioned that there is length of rotting wood below the Bay window. When I moved in there were small gaps and I could literally see daylight where the bay window connects to the wall. I put insulation foam in the gaps and then used filler to cover those areas.

Before installing the thermal lining paper we did get mould on the skirting boards, walls and the bottom of the window seal but thought that was due to a cold wall which is why I installed the lining paper. 

Ben1989

I'm assuming all images are under the bay window? As mentioned above, give us a zoomed out view for context. How are your glass panes? Do they get condensation between them? 

We need context to know if it's a leak or condensation but importantly I would recommend your daughter not sleep in this room breathing pores in all night.

Slinky

How is the bay constructed? Some of the tile hung ones have almost nothing behind the tiles that provide any form of insulation.

FreeBear

Slinky said: How is the bay constructed? Some of the tile hung ones have almost nothing behind the tiles that provide any form of insulation.

Not just the tile hung ones - Seen a few houses around here, 1920s & 30s build that have had the bay walls stripped back. 3x2 or 4x2 stud work on the upper half, with a lath & plaster internally, lath & cement externally. Zero insulation, and very prone to cold & condensation.

Removing the lath & plaster/cement skin, and filling the void with a good quality insulation has paid dividends.

Danny30

images are under Bay window. Should I remove the lining paper and bleach the mould spores? Will take another picture when I get back home later. 

Danny30

FreeBear said:

Slinky said: How is the bay constructed? Some of the tile hung ones have almost nothing behind the tiles that provide any form of insulation.

Not just the tile hung ones - Seen a few houses around here, 1920s & 30s build that have had the bay walls stripped back. 3x2 or 4x2 stud work on the upper half, with a lath & plaster internally, lath & cement externally. Zero insulation, and very prone to cold & condensation.

Removing the lath & plaster/cement skin, and filling the void with a good quality insulation has paid dividends.

@FreeBear What is something like that likely to cost on average? Sounds expensive

FreeBear

Danny30 said:

FreeBear said:

Slinky said: How is the bay constructed? Some of the tile hung ones have almost nothing behind the tiles that provide any form of insulation.

Not just the tile hung ones - Seen a few houses around here, 1920s & 30s build that have had the bay walls stripped back. 3x2 or 4x2 stud work on the upper half, with a lath & plaster internally, lath & cement externally. Zero insulation, and very prone to cold & condensation.

Removing the lath & plaster/cement skin, and filling the void with a good quality insulation has paid dividends.

@FreeBear What is something like that likely to cost on average? Sounds expensive

Assuming something simple like a square bay 2.4m wide and 500mm deep, it shouldn't be hugely expensive. Material costs, probably less than £200. If you are doing it from outside, scaffolding will be required (either a self assembly tower, or dedicated). Would be a couple of days work spread over a week (need time for plaster/render to dry). As to overall cost if you were paying someone, I wouldn't like to say - It is something I would do myself. I'd also do the work from inside and insulate the entire wall, not just the bay.

Danny30

After reading online I think alot of the issue is due to the poorly installed windows. I remember seeing daylight thorough the gaps before it was plastered and it looks like a bit of a bodge job. Even today there is water building up all around the bottom of the window and mould in the the gaps.

I understand that I have to sort this out and my question was do I need to reinstall the window, buy a new window or would fixing the wall as @FreeBear mentioned resolve the issue with the poorly fitted window? I am completely stuck and don't want to spend a fortune resolving this but scared of mould causing daughter issues.