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01-08-2020 6:47pm#1Today I pulled down a load of cladding that formed the sloped ceiling in my front hallway. This part of the house is single story so this is the underside of a small roof section.
What happened?
There appear to be two sarking layers, the black (which has been torn by something) and what looks to be a newer possibly breathable membrane on top.
The other odd thing is that there are splashy mortar snots all over the rafter, which are not on any of the other rafters.
I have a roll of Solitex and tape handy to patch it, and I could try to cut patches and insert them above, and then tape over, but I'm not sure how much effort is justified given that there's the second white membrane there, presumably doing its job. I'm really NOT keen to lift slates, this was supposed to be a quick job.
The plan here is to partially fill with woodfibre insulation, put an Intello membrane over it (against the rafters), then add new cladding of some sort acceptable to the boss.
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I have a theory!
On further probing it looks like the mortary stuff is all over the topside of the busted felt too, and it's properly thick there, not just splatter.
It's almost as if a jet of plaster came from the sky and burst through the felt, somehow missing the slates.
So my uninformed theory is that when the house was built, the roof was framed and felted but not slated, and in that period the wall above it, or the perhaps the verge of the adjoining roof was being plastered/cemented. Some fool dropped a bucket of plaster/cement on to the unslated roof felt, and through it burst, splattering the rafters in the process.
They then added another layer of felt over the top.
The weakness in this theory is that the white membrane looks much newer. So perhaps it will remain a mystery.
Anyway, I taped it all up so at least it doesn't poke into my ventilation gap above the forthcoming insulation.0 -
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tabby aspreme wrote: »Is there 2 layers of lead flashing on the left side of the last picture, it looks like there is a bellcast behind the lead. During building, the house roof would have been felted and lathed, the cover flashing tacked to the wall and plastered over with a bellcast on the plaster , then when the roof was tiled, the flashing was lifted enough to get the soakers behind it. The cement on the felt is spattered scudding, I would think that part of the roof had the tiles removed for some reason, hence the second layer of lead and modern membrane. The original plaster covering the flashing was probably damaged when the tiles were removed, and another flashing put over it and cut into the wall.
Interesting. Not sure about the two layers, here's a close up.
I think the newer membrane suggests a roof repair as you say, but the really curious thing is the combination of splatter and the hole, suggesting to me that the splatter happened after the hole was made, or at the same time.
It's almost like the hole was made during original construction, covered up by a builder, then water damage developed over time, so the slates were then lifted, the problem discovered and the second membrane put over.
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