Duct sealing closes leaks at duct joints, seams, connections, and register boots using mastic, approved foil tape, or aerosol sealant, so conditioned air reaches the rooms instead of escaping into crawlspaces, attics, or wall cavities. Sealing return ducts also keeps dusty or damp air from unconditioned spaces being drawn into the system.
Why it matters to you
Leaky joints in crawlspaces are common in older Fraser Valley housing, quietly losing heated air and drawing in damp crawlspace air. Leaks are a frequent reason one room stays cold while the rest of the house is comfortable.
Practical guidance
Ask for leaks to be sealed with mastic or rated foil tape, not cloth duct tape, which degrades. Seal and, where needed, insulate ducts that run through unheated crawlspaces or attics.