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Damp Proofing

Loft Damp & Condensation

Anonymous user 16/03/2024 - 2.39 PM

Hi, Having moved into our 2 bed 1920s home earlier this year, I recently boarded the loft which was already insulated, just not boarded. When I went into our loft this week I noticed one side of the roof had a lot of condensation on the felt. On the other side, there is no condensation but a lot of the support beams now have grey mould on them, which is definitely new. There is also a small patch where the felt has ripped and I can touch the underside of the roof tiles, I have no idea how that happened but imagine that could be a cause? Looking for advice as to why both have happened...I assume they are linked?/ any advice on what to do/if we need to hire a professional. Thanks

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3 Answers

B.C Associates (Northern) Ltd

Rating: 5 out of 5

Wallsend

A common problem with insulating roof spaces and lofts is a lack of ventilation. You need to remember all of the heat in the living space tries to get through the roof space so humidity will rise, particularly on cold surfaces and if it can't escape will form on exposed surfaces. Vent tiles can be installed fairly easily or of that's not practical you can consider mechanical ventilation as a last resort. Happy new year

Answered3 January 2021

Anonymous user

If its 1920's the felt will not be great, now days we use non ripable breathable felt, maybe you need s couple of vents to help with condensation as the old felt normally sweats out

Answered3 January 2021

Nots Renovations

Rating: 4.9 out of 5

Sutton In Ashfield

Install some roof tile vents and make sure your loft insulation id pulled away from the eves to aid circulation

Answered3 January 2021