How To Install Flex Duct In Attic

Raise the webbing until the bottom of the flex duct sits 1 2 to 1 inch off the bottom of the attic.

How to install flex duct in attic.

Slide the webbing under the flex duct. 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. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. Attach the joint into the middle and secure with more duct work.

In this video i use mastic and air duct sealant t. The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum. Installing flexible or insulated duct is an easy diy project. Another biggie that i see all the time is sagging ducts.

The straps that hold up the flex duct need to be no less than 1 5. Sometimes the best route for a flexible duct run is up and over an obstruction. Pull the webbing back toward the joist to form a loop. Pull down the insulation so that it covers the core.

Isley s home service inc. Continue throughout the line until air can be discharged at the exit. I ll show you how to get the job done right. The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports.

The first thing you want to do is take either air duct sealant or mastic and spread it around the take off. Pull both sides of your ductwork so that the insulation is free of the ends and then wrap duct tape around both pieces.