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I wandered out to Texas this weekend. Crawled into the Attic Space at my Daughters house to fix a broken 12" duct. Thats not why I went to Texas, but Hell, I'm not going to go by without finding something to fix or improve.
Anyhow, I noticed all the wye branches and plenums were made of Duct board. Leaking at all the tape seems, I got some foil tape and started to close them all up.
My question is, Duck board used because its cheaper or it doesn't wear like metal in high humid environments?
I'm going to go back when things cool down and replace all the ducts this fall. I want to use metal wyes and metal plenums, but I wonder if condensation could cause mold. I assume if I wrap it all air tight with insulation that should work just fine.
Any opinions or experiences in the matter?