How to Install HVAC Ducts in a Basement
HVAC ducts transport warm and cool air from the HVAC unit to the supply air registers in the home. The most common place for HVAC ductwork to run is in the basement of the home, and the supply air registers are usually in the floor. If a home has a second story, there is usually a "duct chase" to allow the duct to rise from the basement to the second floor. HVAC ducts are most commonly round and made out of galvanized metal. It can be a little challenging to install HVAC ducts in a basement; but if you are a home improvement guru, this is a task you can tackle. Does this Spark an idea?
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Things You'll Need
- Tape measure
- Sheet metal ductwork
- Sheet metal duct elbows
- Sheet metal screws
- Cordless drill
- Snips
- Pipe crimper
- Galvanized hanger strap
- Mastic duct sealer
- Caulk gun
- Work gloves
- Safety glasses
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Instructions
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Measure the distance between the two locations that you want to install HVAC duct and purchase the required amount of duct and elbows at your local home improvement store.
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Install the HVAC duct by sliding the non-crimped end over the crimped end. The crimped end will slide into the non-crimped end approximately 1-1/2 inches. Secure the joints together with at least four sheet metal screws.
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Cut down the duct as necessary with your snips if shorter pieces are required. You will have to crimp one end of the cut piece with your pipe crimper to connect it with other duct.
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Install elbows, as necessary, to make turns or offsets. They connect in the same fashion as the ductwork (by sliding over the crimped end and being secured with screws).
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Support your ductwork at least every 5 feet with galvanized hanger strap. To support the duct, secure one end of the hanger strap to a ceiling joist, then loop it around the duct and secure the other end to a ceiling joist. The hanger will resemble the letter "U," and the duct will rest in the middle.
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Seal all duct seams and joints with mastic duct sealer after the ductwork is installed. The mastic duct sealer comes in caulk tubes and is dispensed with a regular caulk gun. Allow proper time for the mastic to cure before turning the HVAC system back on. Each brand of mastic duct sealer has a slightly different cure time so refer to the cure time that is listed on the label of the brand you purchased.
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Tips & Warnings
HVAC ductwork is easier to install with two people.
Insulate your ductwork with foil-faced duct insulation for superior energy efficiency.
Wear gloves and safety glasses when working with HVAC ducts. HVAC ductwork is extremely sharp and can cause serious cuts.
