Kind Of Sealant To Use On External Roof Ducting?

Silicon duct seal is a popular method for sealing gaps in ductwork, while foam duct seal is used for sealing joints. Exterior HVAC duct insulation wrap is essential for transferring heated and cooled air from the outdoor HVAC system to the interior of a building or home. Different materials like mastic and different types of tapes are used for sealing ductwork, with Thermaduct™ being a fortified cladded duct system designed for outdoor applications.

Mastic and latex sealant is a water-based, paste-like substance that hardens after application to ductwork, providing strength and toughness. Master Flow® Duct Mastic is a water-based adhesive that creates a tight seal on duct seams and joints, eliminating air leakage. Sealant increases the overall efficiency of the duct system and may help save energy.

To seal ductwork using traditional methods, you will need foil tape, duct mastic, fiberglass insulation, utility knife, and paintbrush. Loctite Loctite PL Roof and Flashing Polyurethane Sealant is specially formulated to flex and move with your roof, providing long-term protection. Henry 209 Elastomastic Sealant is used for sealing vent flashing and gluing shingles back down.

For a positive and weatherproof seal, use any 100 silicone caulking (Dap, Owen-Corning, etc.). For an even better and longer-lasting seal against water, go with Henry 900 Flashing and Construction Sealant. A good quality silicone sealer works great, with 3M 5200 being a good choice.

Popup camper manufacturers often use 100 exterior silicone sealant for roofs, as it can be removed completely. Liquid Rubber RV Roof Coating Sealant is a liquid that cures into a waterproof membrane and can be used on all types of RV roofs, campers, trailers, and mobile homes. Through the Roof! is an elastic roofing sealant that instantly fixes roof leaks others can’t.