ductwork in brampton

ductwork in attic  Insulating Rigid Ducts in attic space - best practices? We run into a lot of uninsulated ducts in our hot Arizona attics. I would like to know other peoples best practices for insulating - products and retrofit techniques. I am well aware that it would be best to move ducts into conditioned space, so let's save that for another thread - this is for the customers that do not have that sort of budget but also do not want to leave them uninsulated. My first design is using a 2" R8 batt which comes in 4' widths - Knauf Friendly Feel® Duct Wrap and fastening with Zip-Ez fasteners. I am thinking of either sealing the seam with butyl tape or duct mastic. How about one of the bubble wrap products? How do you deal with duct runs sitting directly on bottom chords?   Bubble wrap is nothing but marketing BS, and the FG isn't even going to be close to R8 when you get it installed     First I would fix the duct leakage, air seal the attic area under & around the ducts & dense pack cellulose under the duct     Wrap duct with foam board on 3 sides - 2 layers offsetting your seams & corners (Liquid Nail actually holds pretty well & not much is needed, though that product you listed may work ok also) - finish off sealing all seams &edges with special UL listed HVAC tape  And if you want to do job and some othe professional activity then contact on the call experts http://www.thecallexperts.com