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Is there a vent for cathedral ceilings that butt up to a stone chimney?

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When having the roofing replaced, the contractor said he would not guarantee the work because there were no vent chutes between the joists. I had all the decking removed and the chutes installed at a tremendous expense. Now the chutes are carrying hot, humid air to contact with the cold, stone chimney and running down into the house. A roofer said there was no vent for this condition except the very large and ugly individual vents between the joists. He made a vent by cutting a hole and put down roofing which over lapped the hole and put a plastic mesh material in the opening. He said it might leak when rain falls with high wind and I suspect it has. I need a solution.
asked in House Roof by everett-harvey (120 points)
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1 Answer

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Hi Everett,
 
Sorry to hear you having problems with your roof ventilation, or rather with the installers :-). There's a vent that is specifically designed for such purpose, when the roof abuts vertical wall / surface, chimney wall in your situation. It's called Flash FilterVent and you can find it here - http://www.airvent.com/homeowner/products/ridgeVents-specialtyFilter.shtml (first from the left, click on this link for its detail drawing - http://www.airvent.com/pdf/literature/FlashFltrVentDetailDrawing.pdf).
The vertical piece would have to go under the chimney's counter flashing.
 
Installing fiberglass insulation against the stone wall should minimize or maybe eliminate condensation problem as well. One thing you have to remember is that the vent filter needs to be cleaned once in a while, as soon as it gets contaminated the air flow will stop. I don't have any experience with those vents but it appears that you should be able to lift the vent and remove its filter for cleaning... it might require removing of the chimney's counter-flashing.  
 
Let me know if you have more questions,
Darek
answered by darekrudy (21,730 points)
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