Ductwork Installation In Attic

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.

Ductwork installation in attic.

From air handler installed in a house or in attic. You shouldn t install ducts in a vented unconditioned attic. 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. Adding heat runs in a basement may change the airflow in the ductwork going to other rooms.

Each register should have its own damper that can be accessed for adjustment. From furnace installed anywhere in a house or in attic. Install ductwork so that it is in direct contact with i e laying on the ceiling and or truss lower cords. Give your ducts the proper support.

Should i have the ducts lowered away from joist a few inches. 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. The doe s building america program recommends beds buried encapsulated ducts.

Choose properly sized ducts. This is an especially relevant tip for flex ducts more on that in a. 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. Duct liner isn t generally a diy installation and if your ducts already have liner you don t need to insulate the exterior.

Expect to pay 35 55 per linear foot including labor and materials. Joints 1 are attached and the ducting is connected to vents and your hvac system. Duct board much like the duct liner is also a fiberglass product. By spraying closed cell foam on the ducts before burying them in attic insulation you prevent the condensation problem.

Contractors will plan the lines of ductwork needed according to your lighting then cut the ducting to fit the planned lengths. Ductwork installation will almost always take place in your attic. Here is my problem. I have my duct work in the crawlspace of my home its about a 4ft crawl.

How to properly install ductwork in an attic tip 1. Install dampers at the registers to adjust airflow. 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. Heaping insulation over the ducts is fine in dry climates but can cause condensation on the duct insulation jacket in humid climates.

There are several reasons for running ductwork in attic.