Duct work covered with this

gporter · October 17, 2007, 4:05am

This home was built in 1961. What is this covering on the duct work.

cbottger · October 17, 2007, 7:35am

Paper discolored by heat

dvalley · October 17, 2007, 10:38am

I concur…

ldapkus · October 17, 2007, 12:11pm

Doesn’t look suspicious to me.

gporter · October 17, 2007, 12:36pm

Thanks

Brian_A.MacNeish · October 17, 2007, 11:22pm

HHMMMM!! In Florida. Does this HVAC system have A/C? If so, could it be an insulation covering with an asphalt based exterior vapour barrier to prevent moisture condensing on cool duct surfaces in humid wether?

Looks like an asphalt coating to me. How hot would heating air have to be to discolour paper that much? 300-400 deg F…the high limit should’ve shut it down way before that point!!!

cbottger · October 18, 2007, 12:33am

Lo

I did not think I would have to spell it out word for word he did say 1961.

Heat over time = discolored paper see it all of the time

dvalley · October 18, 2007, 11:00am

Yep, Same here.

Brian_A.MacNeish · October 18, 2007, 11:02am

Gary: Is there insulation under the paper covering the ductwork?