Looking at the cooling load only, the additional load would be: One ton of air conditioning equals 12,000 BTU/hr, so this would be almost half a ton (0.44) of cooling load. Insulate your new or existing 8 in. Make sure all sheet metal joints, seams and penetrations are sealed. Fiber Duct Insulation, 2. Select a Store for Accurate Local Pricing, Light weight, highly resilient, blanket-type thermal and acoustical insulation made of glass fibers, bonded with a white, formaldehyde-free resin, Available in a variety of densities, thicknesses, widths and roll lengths, Supplied with an FSK vapor barrier facing to meet installed performance requirements, with a 2" (51 mm) stapling tab, Recommended as thermal insulation for the exterior of HVAC systems or other spaces or surfaces where temperature control is required.

All Photos, Renderings, Illustrations and Literature are the Property of Reflectix, Inc. All Rights Reserved. Even with a really nice installation, as in the photo in Image #2 below, there’s usually compression at the supports. It is used for external insulation of commercial and residential heating, air-conditioning and dual-temperature ducts. Strap Hanger: Wrap Reflectix® with the seam at the hanger. Crawl spaces can vary a lot, depending on how much above-grade foundation wall there is, but 85°F is typical. Ducts just don’t get anywhere near the attention they deserve in most homes. The duct insulation R-values I mentioned above are what’s on the product label. 48 x 3 in. Installing contractors prefer Microlite EQ’s bio-based binder for many reasons, including improved handling, easier cutting and less dust.

Note: Installation instructions and illustrated drawings are recommendations only, while proper local construction methods are the responsibility of the installer. Refer to your local plumbing inspector or manufacturer for more details. So today I’m going to talk about a problem that doesn’t get nearly enough attention: duct insulation — even when the design and installation are perfect. DOWNLOAD PRODUCT DATA SHEET PDF | 774 KB. But what if you have an older house that doesn’t have R-8 duct insulation? Sign up to receive email about product launches, events, deals & more!

If you’re facing that as one choice for a new home or if you already have that in your existing home, here are some ways to reduce your duct losses: We’ve gotten new homes to be much more efficient in the past decade because of energy codes that require blower door and duct leakage testing, better windows, and higher levels of insulation.

A few questions: In your 'additional load' calculations, did you account for the difference in air temperature for returns vs supply?

STORAGE Microlite FSK duct wrap should be kept clean and dry during storage, transport, installation, and system operation. That’s a topic worth its own article, though, so all I’ll say here is that when a product is laid out flat for testing and then installed cylindrically, the actual R-value likely isn’t the same as what’s on the label. Nobody expects more from us than we do. So the delta-Ts would be: I don’t know about you, but when I look at that, it seems we may be prescribing too little insulation for ducts in unconditioned attics.

HV Spacers Affixed to Corners Method (Rectangular Ducts Only) That’s one of Mike MacFarland’s jobs in northern California, where burying ducts is a no-brainer.

Microlite® EQ FSK Formaldehyde-free™ duct wrap offers superior thermal performance and condensation control in a lightweight, blanket-type insulation with an FSK facing. OK, maybe the design isn’t quite perfect. R-6 and R-4.2 are common R-values for ducts.

Reflectix DW1202504 Spiral Duct Wrap, Silver 4.6 out of 5 stars 322.

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).

Each roll of insulation includes two rolls of spacer strips.

This product is R-6 when installed directly on duct but R-8 when using risers.

R6 or R8 Duct Wrap Add to Wish List Add to Compare. For the best experience on our site, be sure to turn on Javascript in your browser. The numbers are even higher for the additional heating load. Have questions or need assistance?

Reflectix is proud to announce the introduction of a new and innovative design in Duct Insulation; the Reflectix® R-8.0 Fiber Duct Insulation. Fiberglass duct insulation wraps (R4.2, R5, R6, and R8) w/ FSK Foil facing. I’ve written about ducts quite a bit here and have shown problems resulting from poor design and installation.

If it were, all the ducts would be in conditioned space. 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. Part #J278795079 Foil Scrim Kraft Wrap, Johns Manville Microlite® Foil Scrim Kraft Duct Wrap, Johns Manville Microlite® 2.33 x 48 in. Fiberglass duct wrap also known as Fiberglass blankets/FSK wraps are formaldehyde free and made by Knauf Insulation.

With superior services, our premiere loyalty program and cutting edge technology solutions, we provide you with what you need in order to set your business apart from others. 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.

(I’m looking at you, Mississippi and Alabama.) You must be a magazine subscriber to access this feature. Duct Wrap, Johns Manville Microlite® 3 x 48 in. The largest delta-T in the house has the lowest R-value.
Install the spacers every 24” to 26” apart on all four corners of the duct.

Make sure the duct is free from dust and dirt by wiping it down with a shop rag. And then there’s the issue of how the R-value on the label is determined. 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.

A reduction in labor costs due to easier installation and handling make Reflectix® your product of choice when you are considering your duct insulation options. And conditioned air inside a duct is about 58°F. All the ducts are in the attic. Single Wall Flashings Collars & Roof Caps, Skip to the beginning of the images gallery. This includes round, rectangular or square ducting. 3.

Wrap the duct in a big looping fashion down one direction of the duct and then back (criss-crossing candy cane pattern).

All seams must be taped so the insulation acts as a vapor barrier.This insulation is constructed of a triple layer of polyethylene single bubble insulation, with each layer of single bubble insulation bonded to two radiant barrier metalized sheets.

All rights reserved. Become a GBA Prime member and get full access to GBA articles, enyclopedia, videos, CAD library, and more. Or you live in a state that doesn’t require R-8 on the ducts?

With more than 50,000 products online, always make Ferguson your first choice! Fasten the Reflectix® by either tapping the seam or plier stapling the two edges together.


I pulled up a job we did a few years ago to play around with different scenarios.

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This feature has been temporarily disabled during the beta site preview. In order to achieve the R-8 value the spacer strips must be used and placed every 2' on the ducting. Go with hydronic distribution and keep all the pipes inside conditioned space. Using a Blower Door for Zonal-Pressure Testing, Improving Indoor Air With a DIY Portable Air Cleaner, In humid climates, burying ducts can be a risky strategy.


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