Roof Jacks

Every pipe that punches through your roof is a leak waiting to happen — unless you flash it right. Pipe jacks for roof penetrations are really just weatherproofing collars: a base flange that tucks under shingles and a boot or collar that grabs the pipe and keeps water out. Simple concept, but the wrong material or a sloppy fit and you're chasing stains across a ceiling in two winters.

Copper and stainless steel pipe jacks outlast the rubber boots that come standard on most jobs. Those rubber sleeves dry-rot from UV in maybe seven years, sometimes less on a south-facing exposure. Metal jacks? We've pulled 30-year-old copper units off tear-offs that still had life left. The patina looks better than the day they went on, frankly.

Sizing matters more than people realize. Measure the outside diameter of your pipe — not the nominal size — and match it to the jack. A 3-inch plumbing vent and a 3-inch pipe are not always the same OD, depending on material. Get it wrong and no amount of sealant fixes a sloppy collar.

And always account for roof pitch: a jack made for a 4/12 slope won't sit flat on an 8/12, which means gaps under the flange and water finding its way in.

We carry pipe jacks for roof vents and plumbing stacks from 1.5" to 6" diameter, in copper and stainless, with custom pitch options. If you're not sure what fits, call us — we've talked through thousands of these.