PlayHaven Green Building Project

HEATING AND COOLING: Sealing up the Ductwork (December 2009).

Here is Gary using a caulking gun to seal up the small gaps in the ductwork. He also used a water-based mastic to seal up the big gaps in the ductwork.

What is mastic? Its a liquid sealant that stays somewhat flexible when it dries.

So, did it help? Sure Did!! When Gary started working on the obvious gaps, it got him ready to check out the rest of the ductwork and he found some places where the ducts lead to nowhere and others where they had pulled apart. So he was able to seal off the unused ones and fix the others before putting sealant on those.

The end result was more warm air blowing out of the registers where it was supposed to be going.

FYI: Our house has ductwork that splits off of the furnace to go in 2 separate directions. And inside those 2 ducts are baffles that we can open or close in greater or lesser amounts so that we can control how much air is being blown into each direction. Because one of them leads to the 2nd story, we can reduce the flow of heated air to that area in the winter (since heat rises from the first floor) and increase the flow of cooled area in the summer. This is not as efficient has having zone heating and cooling... but its better than not having the option at all!

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