Mastic Sealed Ductwork

Duct mastic (RCD) is applied to a joint with a brush. Mastic remains flexible and holds a seal as the duct expands and contracts.

All joints and connections of ducts in non-conditioned space should be sealed with mastic. (Never use standard duct tape; it does not last.)

Fiberglass mesh tape is embedded in the mastic around the joint for added reinforcement.

Another coating of mastic should be applied over the mesh tape for a long-lasting seal.

Duct losses in vented attics are common. Well-sealed and -insulated ducts save energy, increase comfort and allow you to downsize the A/C enough to pay for energy-efficient upgrades.
3/29/2007 10:35:36 PM
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