Smoke pellets for finding roof crawl space gaps
Posted: August 29th, 2018, 4:27 pm
I live in a small self-managed 3-story purpose built (1978) block of flats, which has a mansard roof with the top flats in the roof, so to speak. It has a two communal stairwell windows, the top story one of which is a dormer and I recently noticed has a bit of a draft coming in from around the outside of the inside frame moulding.
I could, of course, just put some sealant around it but I was curious about the draft so I took off the moulding that side and prised open the side panel -- https://imgur.com/a/ymYFhzZ -- and whenever there's a breeze outside a veritable gale (well, almost ) blows through opening.
Just inside the brickwork there's a small gap, maybe 3 inches, that runs vertically and down into the crawl space between wall and roof, and is where the draft blows through from, and from there on to the window it's the cheek of the dormer and the outer frame, etc. The window itself looks well fitted and sealed outside. The crawl space isn't accessible. There's no obvious gaps or holes in the roof, soffits or anywhere else.
So, I'm wondering where the breeze is coming in, esp. with so much of it as a potential concern, and am thinking of getting some smoke pellets and using an old vacuum cleaner that has hose fittings on both in and out ends (and I already use, with bag removed, as a low power leaf blower) to suck in the smoke and blow it into the gap, and then watch from outside to see where it comes out.
Any thoughts on that?
For the pellets, maybe https://www.toolstation.com/shop/p38123 or https://www.diy.com/departments/rothenb ... 117_BQ.prd ? (Both shops being local to me).
I could, of course, just put some sealant around it but I was curious about the draft so I took off the moulding that side and prised open the side panel -- https://imgur.com/a/ymYFhzZ -- and whenever there's a breeze outside a veritable gale (well, almost ) blows through opening.
Just inside the brickwork there's a small gap, maybe 3 inches, that runs vertically and down into the crawl space between wall and roof, and is where the draft blows through from, and from there on to the window it's the cheek of the dormer and the outer frame, etc. The window itself looks well fitted and sealed outside. The crawl space isn't accessible. There's no obvious gaps or holes in the roof, soffits or anywhere else.
So, I'm wondering where the breeze is coming in, esp. with so much of it as a potential concern, and am thinking of getting some smoke pellets and using an old vacuum cleaner that has hose fittings on both in and out ends (and I already use, with bag removed, as a low power leaf blower) to suck in the smoke and blow it into the gap, and then watch from outside to see where it comes out.
Any thoughts on that?
For the pellets, maybe https://www.toolstation.com/shop/p38123 or https://www.diy.com/departments/rothenb ... 117_BQ.prd ? (Both shops being local to me).