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I have recently moved into a 100yo house. The felted slate tile roof seems in very good nick and the survey at time of purchase found no problems. Recently we developed dampness in a bathroom and a roofer had a look and did some repairs to pointing around a chimney at a corner of the house and adjusted the lead in some way. There was exceptionally heavy rain for days before the damp appeared in the bathroom and he said he thought rain was getting in under the tiles at the edges when it was very windy. He said he was 95% sure this would solve the problem which was obviously chronic as there was some damage (rot) to some of the wooden beams in the roofspace, just at the corner of the house, but 'nothing serious'. The latter has alarmed me somewhat and I went up to roofspace for a closer look. The main beams seem fine and are obviously treated, but there is some rotten wood right at the corner, underneath where bricks from an unused chimney begin and also behind an adjacent gutter. I suspect the fascia board is rotten and can see the white gutter through a small hole in it, again confined to this corner of the roof. One foot away from this area, the wood seems sound.
Apologies firstly for my somehwat vague and ill-informed description of the problem. I have no expertise or experience in this field (or diy in general!) and hence am looking for some advice and hopefully reassurance. Does this sound like a major problem which I need someone else to look at for a second opinion, or does a little rotten wood under an otherwise very stable-seeming chimney require no intervention at this stage other than to fix the leaking roof causing it? I am awaiting rain to see if the latter has been successful but regardless have concerns about the wood damage. Roofer seemed knowledgeable and trustworthy but I have no idea about these things.
 

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I would monitor the situation closely. As long as the leak has been completely stopped and the damage is not bad enough already to cause a collapse you should be ok.

But if you continue to see water intrusion, get ready for a substantial bill for repairs. Slate tiles are known for their very long lives but they are also much more difficult to repair/work with.
 

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Welcome to the forum, @datecap.
IMO, wood rot will spread, if not treated. Can you spray it with something to kill the rot?
 

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Welcome @datecap. I had a leak around the AC mount on the rooftop HVAC. Sealed it with gobs of Henry's sealer. It has lasted for about five years, but is beginning to leak again slightly. I'm no longer climbing on roofs so I'll have someone else do it. I also set up extra flashing to direct water away from the mount. Henry's stuff is like black tar, and you WILL get it all over yourself, so wear gloves. I just trowled it on. It can go on when it's wet.

Dry rot is fungal, so you have to treat the wood, usually with a Boric acid sprayed on. If the damaged area is not too bad, you could also fill it. If you don't treat the wood, the fungus can spread. Here's a Wiki how to on treating rot. 8 Easy Ways to Treat Dry Rot - wikiHow

As to dry rot, I think that after you stop the leak completely and treat the rotted areas, I'd consider adding a 2x along side, preferably treated and secured through the good wood.above and below the rot. If there is any sag where it's rotted, I'd jack it up nice and straight, then add the 2x I'd probably use 2 or 3 nuts and bolts to secure the 2x reinforcement.
 

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Discussion Starter · #7 ·
I would monitor the situation closely. As long as the leak has been completely stopped and the damage is not bad enough already to cause a collapse you should be ok.

But if you continue to see water intrusion, get ready for a substantial bill for repairs. Slate tiles are known for their very long lives but they are also much more difficult to repair/work with.
ok, I will share the pictures.
 

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Welcome @datecap. I had a leak around the AC mount on the rooftop HVAC. Sealed it with gobs of Henry's sealer. It has lasted for about five years, but is beginning to leak again slightly. I'm no longer climbing on roofs so I'll have someone else do it. I also set up extra flashing to direct water away from the mount. Henry's stuff is like black tar, and you WILL get it all over yourself, so wear gloves. I just trowled it on. It can go on when it's wet.

Dry rot is fungal, so you have to treat the wood, usually with a Boric acid sprayed on. If the damaged area is not too bad, you could also fill it. If you don't treat the wood, the fungus can spread. Here's a Wiki how to on treating rot. 8 Easy Ways to Treat Dry Rot - wikiHow

As to dry rot, I think that after you stop the leak completely and treat the rotted areas, I'd consider adding a 2x along side, preferably treated and secured through the good wood.above and below the rot. If there is any sag where it's rotted, I'd jack it up nice and straight, then add the 2x I'd probably use 2 or 3 nuts and bolts to secure the 2x reinforcement.
try this company for roofing work https://www.roofersofarlington.com
thank you for your suggestion
 
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