How To Install Flexible Duct In Attic

The first thing you want to do is take either air duct sealant or mastic and spread it around the take off.

How to install flexible duct in attic.

The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum. Hold the loose end of a roll of duct support webbing against the side of a roof joist sitting directly above the flex. Pull down the insulation so that it covers the core. Pull both sides of your ductwork so that the insulation is free of the ends and then wrap duct tape around both pieces.

Slip the flex duct s inner core over the plenum or collar and onto the mastic glue. The straps that hold up the flex duct need to be no less than 1 5. 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. How to hang flex duct in an attic 1.

Attach the joint into the middle and secure with more duct work. Spread a thin layer of mastic glue onto the beaded end of the plenum or metal collar. The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports. Continue throughout the line until air can be discharged at the exit.

Push the core so that it. Ensuring your attic is properly insulated is essential to this endeavor. But without proper support ducts can develops sags or kinks that reduce airflow 4a 4b. 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.

Installing flexible duct insulated duct diy 1. Sometimes the best route for a flexible duct run is up and over an obstruction.