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Insulation Materials :
The most common material used for insulating heating and cooling ducts is fiberglass. Fiberglass duct insulation is available in various thicknesses and R-values and in either a flexible or rigid form. The flexible type comes in rolls and is relatively easy to install on either round or rectangular ducts. The rigid type is best suited for rectangular ducts. In some cases, the ducts themselves are constructed of this material (called “duct board”), reducing or eliminating the need for additional insulation. Any duct insulation material should incorporate a foil or vinyl coating to prevent moisture from being absorbed by the insulation. Any existing insulation that has gotten wet should be replaced Technova Waterproofing Pvt.Ltd..
Before installing duct insulation, be sure to seal any leaks or loose joints with either duct mastic or foil tape. Cloth duct tape is not recommended, as it tends to come loose over time. For more information, see “Duct Sealing” Technova Waterproofing Pvt. Ltd.
Condensation on Metal Ducts
In humid climates, metal ducts can be prone to moisture condensation, which occurs when warm, humid air contacts a cold surface. Ensuring that the insulation covers the entire surface of the ducts, including the connections to supply registers, can minimize condensation. Any seams should be sealed air tight with foil tape (cloth duct tape is not recommended). A popular alternative in humid climates is the use of pre-insulated flex duct and/or insulated duct board. Both materials reduce the likelihood of condensation because their surface temperature is closer to that of the surrounding air. Technova Waterproofing Pvt. Ltd.
Ducts Within the Conditioned Space
Ducts contained within the conditioned space do not need to be insulated. For new construction or situations where ducts are being added to an existing home, enclosing the ducts within the conditioned space can eliminate the need for duct insulation while also preventing heated or cooled air from leaking into unconditioned areas like attics, crawlspaces or basements. Technova Waterproofing Pvt. Ltd.
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