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 Post subject: Moisture in roof
PostPosted: Sat Apr 28, 2018 9:08 am 
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I've been having a look up in my loft as part of a periodic check and noticed some water staining.

IMG_0980.JPG [ 303.48 KiB | Viewed 597 times ]

The bottom of the sarking that's dislodged was also water stained. Curious about how the leaves got there as well, as the only open path into the roof space is either via the grated gable vents, or the soffit vents seen (which are wire meshed).

This is what the roof is like from the outside, and where the water staining relates to the roof.
IMG_0982.JPG [ 459.4 KiB | Viewed 597 times ]

This is more typical sagging for the sarking in my loft space
IMG_0981.JPG [ 388.79 KiB | Viewed 597 times ]

So I took a look around. There are 4 sarking boards that are dislodged like this and have been ever since I lived here for the last 8.5 years. A check of other sarking boards revealed no staining on the boards elsewhere, but there was a little spotty staining on some of my encapsulated insulsation foil underneath some of the bottom of some ofthe sarking edges.

So I'm wandering, is this the effect of condensation running down the roof felt that I'm seeing, or has rain managed to penetrate through the tiles and felt? I know that the ridge tiles above this roof space can be lifted, so that's on my todo list.

Condensation is a concern. I also noticed some blue staining on the ridge point of the trusses, which could be mildew I'm guessing. The question is whether this is a normal amount, or whether there's corrective action needed.
IMG_0979.JPG [ 398.87 KiB | Viewed 597 times ]

House was built 1993. Timber frame construction, so I'm keen to keep it dry.

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 Post subject: Re: Moisture in roof
PostPosted: Sat Apr 28, 2018 6:39 pm 
Pro Carpenter
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Joined: Sat Dec 16, 2006 10:11 pm
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Location: redhill surrey an auld reekie laddie
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because its between 2 vents probably wind driven rain or snow
wet leave can be sticky and possibly roll up small and heavy enough to be blown through the vents then unroll as they dry :dunno:

we are all ------------------still learning

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