Phenolic insulation is a rigid type of insulation with a closed-cell structure, commonly used in construction projects such as ductwork, walls, roofing, and flooring. Due to its design and thermal properties, phenolic insulation is the most thermally efficient insulation commonly used. Phenolic insulation is commonly available in R-values between R-6 up to R-24 in a single sheet of board, but two phenolic insulation boards can be used together to achieve higher R-values such as R-30 to R-45 depending on the thicknesses.
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How Phenolic Insulation is Made
Phenolic insulation is made through a process of utilizing a wet foam mix which is first added to the bottom layer of facing. It then expands to meet the top layer. This is then cooked under pressure and cured in a second oven. When ready, the phenolic insulation boards are cut to the right size and packaged up.
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Benefits of Phenolic Insulation:
Comparing phenolic duct fabrication to sheet metal, you are working with a 3 Dimensional material. Where plasma or laser cutting would handle and X & Y plane, with Phenolic, CNC routers are used to cut into the Z axis effectively. Cutting angles into the panel allows fabricators to fold or assemble duct sections into their shape.
Phenolic Duct is fully sealed in each corner with a continuous bead of sealant supplied by the manufacturer in all 4 corners of the duct section. Longitudinal seams can be secured on the exterior with panel fasteners, which are metal clips with teeth that grip into the phenolic, and sealed with UL 181 approved tape.
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