Seal Around B Vent Attic

Steps for fixing a leaking rooftop vent pipe.

Seal around b vent attic.

To properly seal around air vents apply caulk or expanding foam between the ducting and the sheetrock. Use a pocketknife to scrape rough edges and sharp points from upper end of plastic vent pipe. When your roof was installed each vent pipe received a flexible boot to seal water around the round surface of the vent pipe. Cut away the old caulk from around the vent pipe.

Aluminum base vent pipe flashing with adjustable rubber collar in black model 81840 15 97 15 97. Set your store to see local availability add to cart. There are many possible parts of the roof potentially leaking but one of the most common ones is the area around the roof vent. Furnace flues require special sealing techniques the opening around a furnace or water heater flue or chimney can be a major source of warm air moving in the attic.

Use the knife blade to scrape the pipe clean and smooth. Seal openings around plumbing vents and electrical wires with expanding foam photos 8 and 9. Let s have a quick look at this simple yet effect energy savings solution. Clear flexible roof sealant model 0309 ga 9 97 9 97.

Next apply weather stripping around the underside of the vent cover. B vent pipes are used to vent combustion by products from gas burning appliances such as furnaces and water heaters many builders seem to think that because materials such as rockwool insulation are used as fire stopping that it should be good to go right up against the hot pipes. Gibraltar building products 1 4 in. Vent pipe leaks during heavy rain can occur if you have cracks in your vent pipe boot or flashing.

Because the pipe gets hot building codes usually require 1 inch of clearance from metal flues 2 inches from masonry chimneys to any combustible material including insulation. The roof vent pipe is installed cut through the roof and around the pipe attached to the roof is surrounded with rubber boot as insulation for the gap between the pipe and roof. Leak stopper rubber flexx 10 oz. These boots vary in quality flexibility and longevity.

The goal is to prevent conditioned air from escaping or unconditioned air from entering the thermal envelope. This stuff is super sticky and almost impossible to get off your clothes and skin. Seal around electrical boxes with caulk photo 9. As a seattle home inspector i frequently find insulation tightly packed around b vent pipes that run through attics.

This will further improve efficiency and prevent energy losses.