Ductwork Installation In Attic

Each register should have its own damper that can be accessed for adjustment.

Ductwork installation in attic. Duct board much like the duct liner is also a fiberglass product. One of the most common mistakes when installing attic ductwork is choosing. 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. 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.

You shouldn t install ducts in a vented unconditioned attic. Install dampers at the registers to adjust airflow. Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates. 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.

From air handler installed in a house or in attic. Adding heat runs in a basement may change the airflow in the ductwork going to other rooms. From furnace installed anywhere in a house or in attic. This is an especially relevant tip for flex ducts more on that in a.

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. Ductwork installation will almost always take place in your attic. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior. Here is my problem.

Expect to pay 35 55 per linear foot including labor and materials. The doe s building america program recommends beds buried encapsulated ducts. Choose properly sized ducts. Burying ducts in attic insulation.

Should i have the ducts lowered away from joist a few inches. My home is 20 yrs old. There are several reasons for running ductwork in attic. By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem.

As most gba readers know ducts belong inside a home s thermal envelope not in an environment that s cold in the winter. Joints 1 are attached and the ducting is connected to vents and your hvac system. Contractors will plan the lines of ductwork needed according to your lighting then cut the ducting to fit the planned lengths. House is very big and spacious and there are not enough walls for all heat runs and cold air returns.

Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords.