On Tuesday, February 18, 2014 11:57:02 AM UTC-6, wrote:
On Tue, 18 Feb 2014 06:11:22 -0800 (PST), wrote:



I am wanting to convert my flex duct in my crawl space to metal duct. However, the duct at Lowes seems flimsy. I also am having in the summer condensation on my ductwork. I want to eliminate this.



Can I use the expanding spray can foam sealant or rubberized undercoating like you use on a car to spray the duct before installation, then wrap it with the duct wrap insulation to maximize the insulation value of the duct and to give the duct rigidity?



One last thing, can a person buy the professional spray insulation material and spray it themselves at home in the attic etc? I have a large air compressor and several spray guns? I would like to add some insulation myself, especially in the attic.



I really appreciate it!

For the ductwoek, you want STEEL dunt, not aluminum - it is stiffer.

Then you want to put pipe wrap on it in a non-heated crawlspace -

AFTER you seal all the joints - usually with aluminum duct sealing

tape. No reason you couldn't spray the ductwork with bed-liner if you

want to toughen it up.



That flex "duct" should be totally outlawed for ANY use.

Any problem using bedliner material on it if the material says it is flammable?