What are the options to retrofit/reinsulate existing walls?

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Posted by: from Markhan
1/14/2019 at 12:44:26 AM

I moved in a 25 year old house. It's relatively cooler than a newer place I lived at.

I checked the attic, and the insulation looks very thin at some places. In fact, I could almost see the vapor barrier, so I know that it needs to be re-filled.

I would like to re-insulate the exterior walls as well. What are good option other than tearing down the dry-wall and re-insulate all again.

The current insulation is some yellow cellulose, I think. Is spray foam good idea?

Also, how much would it cost to do spray foam. Say the house is about 2500 sqft.

Any suggestions on attic?

Thank you.


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Date/Time1/15/2019 at 2:19:55 PM

Hi Nate,

Spray foam is a fantastic new(ish) tool to the home building industry, however with most new technologies it comes at a price tag that generally makes it only advantageous in certain situations. I would start by simply topping up the attic insulation with blown in, and making sure that you have proper ventilation in your attic space as well. The next step I would take is to look at your windows, you made no mention of their condition but in a 25 year old home they can be a difference maker!

As for the walls, tearing down all of your drywall and reinsulating is 9 times out of 10 not the right answer. Our go to answer (in -30 Edmonton, Alberta) is usually with exterior insulation products. Strapping the exterior of your home with a 1"-2" foam board can increase the R-value of your walls by up too +R-10 and you will get a beautifully renovated exterior as well!

I hope this helps with your dilemma and best of luck to you! Don't forget to hire a qualified professional and get a detailed written contract!

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Nate in Markhan
Date/Time1/16/2019 at 1:28:23 AM

Hi Cody

Thanks. Yes, I was thinking of doing the attic. The windows in some rooms need to be upgraded. They are old two sliding windows.

The exterior walls are brick so not sure how easy it will be.


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