Ductwork Installation In Attic

This is an especially relevant tip for flex ducts more on that in a.

Ductwork installation in attic.

Made from 1 to 2 inch thick sheets of rigid glass fiber and coated with an aluminum laminate for a moisture air barrier duct board comes in. If those dampers can t be accessed from below you ll want to install them close enough to the register so that you can reach them through the register opening. You shouldn t install ducts in a vented unconditioned attic. Each register should have its own damper that can be accessed for adjustment.

Here is my problem. House is very big and spacious and there are not enough walls for all heat runs and cold air returns. Burying ducts in attic insulation. There are several reasons for running ductwork in attic.

Joints 1 are attached and the ducting is connected to vents and your hvac system. How to properly install ductwork in an attic tip 1. When hvac ducts are installed in a vented attic in a dry climate bury the ducts in attic insulation to protect them from temperature extremes in the unconditioned attic space. Give your ducts the proper support.

Contractors will plan the lines of ductwork needed according to your lighting then cut the ducting to fit the planned lengths. Choose properly sized ducts. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. From furnace installed anywhere in a house or in attic.

I have my duct work in the crawlspace of my home its about a 4ft crawl. One of the most common mistakes when installing attic ductwork is choosing. Should i have the ducts lowered away from joist a few inches. Duct board much like the duct liner is also a fiberglass product.

My home is 20 yrs old. Expect to pay 35 55 per linear foot including labor and materials. Ductwork installation will almost always take place in your attic. As most gba readers know ducts belong inside a home s thermal envelope not in an environment that s cold in the winter.

By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem. Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates. Adding heat runs in a basement may change the airflow in the ductwork going to other rooms. My floors have soaked the moister from the condensation of air vent that now it has rotten my joist where the vent touched them and subfloors are as well.

The doe s building america program recommends beds buried encapsulated ducts.