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  1. #1
    Join Date
    Jul 2006
    Posts
    47

    Duct insulation question

    What is the best type of insulation for ridged duct in an unconditioned crawl space with conc. slab floor? Is 1-1/2 " foil backed sufficient?

  2. #2
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    insulate the crawl walls -- including over the vents.
    2" Styrofoam works well
    harvest rainwater,make SHADE,R75/50/30= roof/wall/floor, use HVAC mastic,caulk all wall seams!

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