How To Install Flexible Duct In Attic

How to insulate your attic duct system step by step with video instructions as winter nears many will begin to activate their home heating system to keep the house warm in the blustery and frigid temperatures that accompany the change in seasons.

How to install flexible duct in attic. How to hang flex duct in an attic 1. Ensuring your attic is properly insulated is essential to this endeavor. Pull both sides of your ductwork so that the insulation is free of the ends and then wrap duct tape around both pieces. Pull down the insulation so that it covers the core.

Attach the joint into the middle and secure with more duct work. Secure the webbing to the joist by hammering a 2 inch roofing nail through the webbing and into the side of the joist. The first thing you want to do is take either air duct sealant or mastic and spread it around the take off. Installing flexible duct insulated duct diy 1.

The straps that hold up the flex duct need to be no less than 1 5. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. Hold the loose end of a roll of duct support webbing against the side of a roof joist sitting directly above the flex. I use the caulking gun with air duct sealant to get back in the spaces it s hard to reach with the mastic.

The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum. The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports. Slip the flex duct s inner core over the plenum or collar and onto the mastic glue. Another biggie that i see all the time is sagging ducts.

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. Push the core so that it.