Black mould on sloping edges of the ceiling

[Trader]

My upstairs bedroom's ceiling slopes slight around the edges because it goes up by about 12 inches to the loft space. As a result, the sloping part is not insulated properly like the flat part of the ceiling.

It gets cold and condensation forms resulting in mould growth on these sloping ceilings.

What is the best way to solve this problem?

 

[noseall]

My upstairs bedroom's ceiling slopes slight around the edges because it goes up by about 12 inches to the loft space. As a result, the sloping part is not insulated properly like the flat part of the ceiling.

It gets cold and condensation forms resulting in mould growth on these sloping ceilings.

What is the best way to solve this problem?

Insulate the sloping bits by adding as much thickness of PIR insulation BENEATH and across the rafters. You'll need some loooong screws.

 

[Wayners]

Foam. Foam sticking kingspan on.
Insulation is what you need to raise dew point. Anything you can do.

Brick shortages after the war in 50s ment some houses have sloping ceilings to save bricks I was told.
Causes problems though with condensation

 

[noseall]

Brick shortages after the war in 50s ment some houses have sloping ceilings to save bricks I was told.
Causes problems though with condensation

Probably one of the most overlooked (as well as bay windows) as far as adequate insulation/venting detail, is concerned.

 

[Murdochcat]

ensure there is adequate ventilation - especially at night because us humans exhale a lot of moisture, as as you have found it tends to settle on the coldest surfaces

 

[Trader]

Thank you for your suggestions so far. I have heard that because I cannot get the rockwool insultation into the tight space at the edge of the eves, pouring down Vermiculite such as this one is a way of solving the problem and insulate the hard to get to space.

https://www.amazon.co.uk/gp/product/B004VL54MI/ref=ox_sc_act_title_1?smid=A184RCZ8L3ZP2S&psc=1

Is this recommended and does anybody have any experience with this?

The house was built in the 1950s. Attached are photos showing the mould.

 

[noseall]

Thank you for your suggestions so far. I have heard that because I cannot get the rockwool insultation into the tight space at the edge of the eves, pouring down Vermiculite such as this one is a way of solving the problem and insulate the hard to get to space.

https://www.amazon.co.uk/gp/product/B004VL54MI/ref=ox_sc_act_title_1?smid=A184RCZ8L3ZP2S&psc=1

Is this recommended and does anybody have any experience with this?
View attachment 354255View attachment 354254
The house was built in the 1950s. Attached are photos showing the mould.

You have classic 'shadowing' whereby the rafters are visible due to the cold bridging etc. That ceiling rake is crying out for insulation ACROSS and BENEATH those rafters.

 

[Trader]

You have classic 'shadowing' whereby the rafters are visible due to the cold bridging etc. That ceiling rake is crying out for insulation ACROSS and BENEATH those rafters.

Yes, that is what I thought. Would pouring down Vermiculite be much easier? Are there any problems associated with this? I know that it may be more expensive than insulating wool or foam but much quicker to do.

 

[^woody^]

Yes, that is what I thought. Would pouring down Vermiculite be much easier? Are there any problems associated with this? I know that it may be more expensive than insulating wool or foam but much quicker to do.

No, as stated in the post you quoted, the staining from the rafters will remain. You need insulation below or below and between.

 

[noseall]

Would pouring down Vermiculite be much easier?

Yes but pointless. As per mine and Woodys posts.

 

[Trader]

Is this a DIY job or what professional do I need?

 

[Wayners]

Roofer or general builder.
Depends on access and space available for the insulation.
Scaffold needed and lift tiles to gain access?
Or you could pull down plasterboard and add insulation from the inside?

 

[^woody^]

Plasterer

 

[catlad]

If you are reasonably useful with diy / tools you can do it yourself. The rafters are already showing themselves which is a big bonus! With a pencil mark the ceiling top and botton of each rafter , making sure you allow for the thickness of the insulated plasterboard, by which I mean when you offer up the new plasterboard will you still be able to see your marks! All that is required after that is screwing up some new insulating plasterboard over the original uninsulated sloping ceiling using your marks as guides to locate the old afters. I would strongly recommend you remove the wallpaper first and use spray some anti mould on the are before fitting the new materials.

 

[Trader]

Thanks for all your replies. Sounds like a big job!