Roofing Question

Non breathable membrane

Hi, I am having problems with dampness in the ceilings at both ends of the house. I removed the gutter at one end of the building and the ceilings appeared to dry out after a couple of days but when I put the gutter back up the ceilings became damp again. I noticed that the gutter brackets at the back of the house had spacers but the front gutter didn’t and wondered if this might have something to do with it? I also noticed that in the loft the roof membrane is non breathable and some of the overlapping has gaps and is sagging. Can you tell me if the overlaps in non breathable membrane has to be sealed to create a single sheet? This problem is preventing me from selling my house. Thanks in advance.

2 Answers

hi
the overlaps do not need to be sealed as it is a overlap a would be watertight from any water ingress externally. damp could possibly be caused by condensation. this could be avoided if the loft space is has adequate ventilation and insulation. have you noticed any damp or water droplets on the underside of the non breathable felt?..
hope this helps

Answered 2nd Jan 2018

New Tech Roofing Ltd

Member since 14 Apr 2015

Hi you could have some vents fitted to the soffits and if you are concerned about the roof membrane not being breathable their is roof vent tiles wich could be also fitted hope this helps.

Answered 4th Jan 2018

College Town Construction

Member since 27 Jan 2015

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