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shingobeek
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# Posted: 10 Jul 2025 10:57am
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Greetings from N. Minnesota. I put a new steel roof on our 65 yr. old vertical log cabin last fall. Got what I felt was a great flashing job all the way around and a nice wide collar around the chimney. It went through winter great, spring melt several spring rains....no leaking around chimney on inside...we were smiling! Then last week, we got a 2" heavy rain....and we noticed dripping from around chimney. I repaired the cap, repaired visible cracks, loose mortar and rocks etc. in Fall.....Any recommendations on a sealant? Most of the rock up there and work is 60 plus years old.....to my knowledge never been sealed. What would you folks recommend as a sealer? I guess tar is always an option, but I was trying to preserve the rock chimney....when I did the roof many friends were really advocating for ripping it out and going to SS pipe...but I resisted and maybe they were right!
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MtnDon
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# Posted: 10 Jul 2025 02:44pm - Edited by: MtnDon
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Pictures might be good if you have them
And do you mean a leak that seems to be between the rockwork and the metal roof, or water coming down the chimney? I'm thinking between rock and metal roof.
How is thr flashing done?
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DRP
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# Posted: 10 Jul 2025 06:20pm
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Assuming that is all correct... that stuff is probably the source of the leak... look up silane/siloxane sealants. Clear, chemically bonds to the silica in the masonry to repel water from joints.
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Brettny
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# Posted: 10 Jul 2025 07:29pm
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Unless they cut the rock and put flashing up under it it's not a proper seal job. Either way you will need to remove any loose mortar and re joint it. However there are stone/concrete dealers you can use. Theres one for radon that should be waterproof. https://www.radonseal.com/radonseal-mitigation.htm?utm_source=google&utm_medium=cpc&u tm_campaign=RadonSeal&gad_source=1&gad_campaignid=179991&gclid=CjwKCAjwyb3DBhBlEiwAqZ Le5Fo_svdWejPpApKQGXYLZiyQfYBBoiYgLsNthlyw2w_Fez4s7s5WrRoCK8kQAvD_BwE
On my house aboit 14yrs ago when I had it all gutted inside and was going to do the roof. The subject came up of taking down the masonry chimney. Well I should have done it, I cant go 5yrs without some section of that leaking. In all reality I should have just bulldozed this whole house and started new because there have been major repairs to everything from the roof to the foundation and everything in between.
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shingobeek
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# Posted: 10 Jul 2025 11:02pm
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Ill get some photos, but yes, rock cut, flashing put into groove sealant around that......Yes, I think it is going through small spaces/cracks between rocks, mortar in the 2x2 ft sq. rock structure of chimney. Yet, I cant visually see it well from exterior
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