the vent from the ensuite shower now goes al the way out side
The situation should be checked with an civil engineer who would take a sample of the felt and get it tested if it conforms with the relevant standard
NiallA said:the felt is unlikely to be the problem re the condensation. Felt is a second line of defence from rain AFTER the slate / tiles.
The problem is either excessive moisture getting into the attic ( from the ensuite vent or similar) or the vents in the attic are not installed properly or blocked.
Carpenter said:Hello CMaxwell,
for starters the original p/board ceiling can't be removed to install a barrier. I would suggest he applies two coats of Gyproc drywall sealer, this will reduce vapour transmission but I'm not sure about it's effect on subsequent decoration, try contacting Irish Gypsum and see what they say. Other than than it's important that all openings for pipes etc. are sealed. The 50mm air gap is essential and this must be in place.
Thanks for that Niall.NiallA said:The relevant building regs are available on the department of environments website http://www.environ.ie/DOEI/DOEIPol.nsf/0/a137e0322d60e09780256f5d00504a79/$FILE/30178%20BR%20Ventilation%20F.pdf
Cmaxwell said:when you say "the original p/board ceiling can't be removed to install a barrier." I assume you mean to be reused... and that they could pull it down to replace with the correct board with integrated vapour barrier (the foil backed stuff)... Would that be expensive & time consuming?
serotoninsid said:It would seem that they would need to provide an outlet pipe from the extractor in the ceiling all the way to a vent in the exterior wall.
Carpenter said:however taking down the board and replacing with a duplex board (foil backed) would be a big job and the builder is most unlikely to agree to this plan.
Its good to catch these things now rather than later down the road - when its too late to get them sorted.Cmaxwell said:I had a good check over my snag list & I'm glad I came on here last night... It looks like i have exactly the same problem as serotoninsid in that my builder has also just stuck a fan in the dormer ceiling & not vented it at all!
Plus there is already a load of condensation lying on the insulation already.
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