How To Install Flex Duct In Attic

I ll show you how to get the job done right.

How to install flex duct in attic. Sometimes the best route for a flexible duct run is up and over an obstruction. In this video i use mastic and air duct sealant t. Installing flexible or insulated duct is an easy diy project. Another biggie that i see all the time is sagging ducts.

Attach the joint into the middle and secure with more duct work. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. Pull both sides of your ductwork so that the insulation is free of the ends and then wrap duct tape around both pieces. To prevent problems use saddles or straps to support at regular intervals 4c 4d follow the manufacturer s instructions but in case they get lost here is a list of best practices for.

Spread it around with either your fingers or a disposable chip brush or disposable paint brush. Isley s home service inc. Continue throughout the line until air can be discharged at the exit. The first thing you want to do is take either air duct sealant or mastic and spread it around the take off.

Pull down the insulation so that it covers the core. Pull the webbing back toward the joist to form a loop. The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum. Slide the webbing under the flex duct.

The straps that hold up the flex duct need to be no less than 1 5. This is a short training video to show technicians and homeowners how to properly install flex duct to plenums.