How often do you think you get the full labeled R-value? Bury the ducts deeply in insulation.
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Unconditioned attics are the worst place to put ducts. I’m in Georgia (IECC Climate Zone 3), where our current state code requires R-13 in exterior walls, R-18 in attic kneewalls, R-19 in floors, and R-30 in ceilings. It should not be used in weather-exposed applications without proper protection. And conditioned air inside a duct is about 58°F. If you know a little building science, you’ve no doubt seen a lot of problems that occur with air distribution systems. x 50 ft. R8.3 Duct Wrap (278795079) at Ferguson. x 100 ft. SLD Duct Wrap, Copyright © Or, secure spacer (double layered) every 24” to 36” around ducting, fastening the spacers with a UL 181 approved tape. Single Wall Flashings Collars & Roof Caps, Skip to the beginning of the images gallery. STORAGE Microlite FSK duct wrap should be kept clean and dry during storage, transport, installation, and system operation. Reflectix is proud to announce the introduction of a new and innovative design in Duct Insulation; the Reflectix® R-8.0 Fiber Duct Insulation. All rights reserved.

Why Don’t More HVAC Contractors Own Duct Leakage Testers? Zip Code Zone Locator (for Attic & Cathedral Ceiling), RAP (Corrugated Sheet) Return Air Duct Panning, Radiant Barrier (Reflective/Woven Fabric/Reflective), Reduces overall thickness of conventional R-8.0 wrap (3” to 1.25”), Reduces heat loss in the winter and heat gain in the summer, Requires less space than fiberglass to achieve R-8.0 (with 0.75” air space), Thermal Resistance (ASTM C 335): R-8 with 0.75” air space, Flame & Smoke (ASTM E 84/UL723): Class A/Class 1, Water Vapor Permeability (ASTM E96): <0.02 Perms, Temperature Range (ASTM C 411): -50 F to 180 F, Resistance to Fungi/Bacteria (ASTM C 1338): Does not promote growth. Now it’s time to focus on the next level of problems. Wrap the product around the duct and securely tape the linear and circumference seams (overlapping 1”- 2”) with a UL 181 approved tape (goal is an air-tight, snug seam seal). Do not leave any exposed duct or space where air can enter between the duct and the Reflectix®. It is used for external insulation of commercial and residential heating, air-conditioning and dual-temperature ducts. Duct Wrap, Johns Manville Microlite® 24 in. The outdoor temperature would be 92°F. Free Shipping on All Orders* 0. Reflectix® R-8.0 is a 1” thick insulation with an outer 96% reflective surface, a 1” polyester center, and another outer 96% reflective surface. A couple of additional points: Even with ducts running in 'conditioned' space, leaks and inadequate insulation mean that homeowners are paying to deliver a bunch of hot / cool air to the wrong place -- maybe cooling / heating an attic storage area, for example. Make sure all sheet metal joints, seams and penetrations are sealed. The R-values used for the comparison to walls and crawl spaces also appear to be incorrect; if you place a duct in a wall or crawl space, it would not benefit from the R-value of the complete assembly, filled with insulation.

Note: Installation instructions and illustrated drawings are recommendations only, while proper local construction methods are the responsibility of the installer. 48 x 3 in. Crawl spaces can vary a lot, depending on how much above-grade foundation wall there is, but 85°F is typical. This includes round, rectangular or square ducting. When combined with the spacer strips the finished thickness is 11/16" to 3/4" thick.EcoFoil R-8 HVAC Duct Wrap Insulation is meant to be used around any duct work in your home or building. Call us at: For the best experience on our site, be sure to turn on Javascript in your browser. This feature has been temporarily disabled during the beta site preview. Dear Allison: Thanks for the great article. Have you ever considered the temperature differences (delta-Ts) across those different insulated surfaces?


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