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Installing Flexible Duct - Insulated Duct - DIY

Video Summary
Installing Flexible Duct - Insulated Duct - DIY

This is the last thing you want to see, or maybe its the best thing you can see. Last year we paid almost a $1000 a month for energy, and that's why it was killing us. This is part of the reason.

This duct is supposed to be connected to this. And this flexible duct was only duct taped to the the plenum, this take off on the plenum. So basically it only takes a couple years for duct tape to deteriorate, never use duct tape: bad, bad, bad. So what I'm going to have to do is reattach this and I'll show you how to do that.

1. The first thing you want to do is take either air duct sealant or mastic and spread it around the take off. Mastic comes in a bucket, air duct sealant comes in a tube - they're basically the same thing. Spread it around with either your fingers or a disposable chip brush or disposable paint brush. Nickel thick! As thick as a nickel is the rule of thumb.

2. I use the caulking gun (with air duct sealant) to get back in the spaces it's hard to reach with the mastic. Then I spread it around with the chip brush to make sure I get a nice, air-tight seal.

3. Take your flexible duct and peel back the plastic liner, then peel back the fiberglass insulation to expose the inner liner.

4. The inner liner goes around the take off, all the way around and it smooches into the mastic and that's the glue that's going to hold it on.

5. To create an even stronger mechanical joint, we use zip ties, really long mechanical zip ties. And a tensioning tool that you can buy at the Home Depot. You can buy both of them (the tensioning tool and the zip ties) in the same aisle that you buy your filters. This tool has a cut off feature that makes it nice.

6. Take the fiberglass insulation, work it around. Do same thing with the plastic work it forward, work it around until it gets nice and tight against the main truck of your air conditioner or furnace.

7. One last zip tie. Snap it off and you're done. That's it. Couldn't be easier.

If you're sick and tired of spending too much money on your energy bills. Stop by my website at www.howtohomeinsulation.com. You'll find the videos and information you need to start saving money on your energy bills, right now. My name's Corey Binford. Thanks for watching.