How To Install Flexible Duct In Attic

Secure the webbing to the joist by hammering a 2 inch roofing nail through the webbing and into the side of the joist.

How to install flexible duct in attic.

Attach the joint into the middle and secure with more duct work. How to hang flex duct in an attic 1. Sometimes the best route for a flexible duct run is up and over an obstruction. The official recommendation from the adc is that flex ducts should sag no more than 1 2 per foot of length between supports.

Push the core so that it. Hold the loose end of a roll of duct support webbing against the side of a roof joist sitting directly above the flex. Slip the flex duct s inner core over the plenum or collar and onto the mastic glue. The supports need to be at the manufacturer s recommended spacing but no longer than 4 maximum.

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. Continue throughout the line until air can be discharged at the exit. 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.

Spread a thin layer of mastic glue onto the beaded end of the plenum or metal collar. 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. 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. Pull down the insulation so that it covers the core.