Ductwork In Attic Or Crawlspace

Finding space for ductwork in the.

Ductwork in attic or crawlspace.

In the winter a crawl space can be significantly colder than the living spaces of your home. The majority of ducts are installed in unconditioned attic spaces and crawl spaces where they are out of sight. Strap ducts out of insulation with 3 ductstraps per specifications. Measure the circumference of the ducts running through your crawlspace.

Seal supply boxes with mastic. If the ducts are in an unconditioned attic you can put spray foam insulation on the roof deck. Your home s supply and return ducts may or. The accessibility of a home s ductwork is a key factor in estimating the cost to replace it.

I vote for the attic. I lowered soffits around room perimeters. Ii lowered ceilings in hallways. Think about it condensation on ductwork probably isn t a big problem in phoenix arizona but why.

The crawl space is an unconditioned space. Ceiling diffusers can help route vents to alternative locations avoiding lengths of ductwork. If you have ductwork in your crawl space the temperature of the duct will be the same as the temperature of the crawl space. If there is a dirt or gravel floor put down a vapor barrier then seal it off with concrete slurry.

While the attic install isn t ideal it beats the problems that come with ducts. Iv conditioned attic and more. Installing ductwork in the crawl space beneath a home limits movement and poses a lighting challenge. Cut the insulation with the utility knife in sections 2 inches larger than the circumference of the duct.

Ductwork can eat into living space so innovative space saving features like squeeze elbows are in demand. Just like when you have too little insulation if you have an excessive amount of humidity near your ductwork either in your attic or crawlspaces then you increase the likelihood of condensation forming. There can be moisture issues in the crawlspace but i would deal with that before choosing to put the ducting in the attic. If the ducting is not sealed well and insulated you will have plenty of problems because of the high attic temperatures.

How to insulate furnace ductwork in a crawlspace 1. Knowing the disadvantages of attic install and the crawl space install. As don peek says in the comments below it may be more cost effective in existing homes to seal and insulate the ducts as well as you can. Insulate and air seal the floor with open cell foam put ductwork and mechanicals in the attic install a radiant barrier and mastic seal the ducts.

If the ducts are in an unconditioned crawl space you can encapsulate. You can get the air handler and ducts into conditioned space in several ways without needing a basement or crawl space.