06-16-15, 08:18 PM | #1 |
Journeyman EcoRenovator
Join Date: Apr 2015
Location: Oxford, MS USA
Posts: 496
Thanks: 69
Thanked 87 Times in 61 Posts
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Homemade Retangular HVAC Ducts
Howdy guys I got a quick way to save some big bucks on redoing the old or putting in new duct work. I needed to replace an old undersized/under-insulated 8" round metal duct in my attic. It was trying to run 4 registers. So I priced some metal rectangular truck to come off my main plenum, 24 feet long 10" x 12" was a whooping $675! That's not even installed. So I started looking into what would be needed to do the job right. Here is what I came up with. $150 total cost.
Parts list (all from Home Depot) Owens Corning FOAMULAR 3/4 in. x 4 ft. x 8 ft. R-4 Tongue and Groove Insulating Sheathing-37L - The Home Depot GAF 0.5 in. x 4 ft. x 8 ft. EnergyGuard PolyIsocyanurate Insulation Sheathing-1S01 - The Home Depot Master Flow Water Based Mastic Half Gallon Tub-WBA50 - The Home Depot 3M 17.6 oz. High-Strength 90 Spray Adhesive-90-24 - The Home Depot So I took the foam boards to the table saw and cut my pieces out. I cut the PolyIsocyanurate (with vapor barrier) smaller to be 3M spary glued to the FOAMULAR . This is some crazy awesome stuff! Its water based too so it washes up really easy. I the coated EVERY seem VERY well with the mastic and glued them together. I then came back and coated the outside of each seem as well. All done. I just have to make up 2 more and replace the old with the new. This should give me a R valve of over 7. Finished inside size of 13" x 9". |
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