How To Install Flex Duct In Attic

Pull both sides of your ductwork so that the insulation is free of the ends and then wrap duct tape around both pieces.

How to install flex duct in attic.

Attach the joint into the middle and secure with more duct work. The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum. I ll show you how to get the job done right. This is a short training video to show technicians and homeowners how to properly install flex duct to plenums.

Pull the webbing back toward the joist to form a loop. Spread it around with either your fingers or a disposable chip brush or disposable paint brush. Slide the webbing under the flex duct. Installing flexible or insulated duct is an easy diy project.

But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. Raise the webbing until the bottom of the flex duct sits 1 2 to 1 inch off the bottom of the attic. In this video i use mastic and air duct sealant t. The straps that hold up the flex duct need to be no less than 1 5.

Another biggie that i see all the time is sagging ducts. The first thing you want to do is take either air duct sealant or mastic and spread it around the take off. Continue throughout the line until air can be discharged at the exit. Isley s home service inc.

Mastic comes in a bucket air duct sealant comes in a tube they re basically the same thing. Sometimes the best route for a flexible duct run is up and over an obstruction.