Do I need to remove old attic insulation before installing new fiberglass batts?

Question Icon
Posted by: from Montreal
11/4/2014 at 6:00:45 AM


The house was built in the 50's. I would say if the insulation in the attic was redone it would have been 30 years ago. If the old insulation does not need to be removed, do I lay the new insulation the same direction or cross wise?

Thank you,


User Icon
Gonzalo from My Man at Home in Brampton
Date/Time11/4/2014 at 1:08:27 PM

Hi Leo,

About your Attic; you cannot keep it because your old fibre glass insulation is probably loaded with asbestos and once you move it it should be replaced (by law).

Good luck Leo

Design interior,

Customer service

Gonzalo Pastorino

User Icon
Josh from Welch's Drywall in Portland
Date/Time11/4/2014 at 3:38:23 PM

Hi Concerned!

You don't have to remove anything. If at all possible, why don't you just have somebody come in and blow new insulation over it. If you are going to put batts up there, install them the opposite way they are going and make sure you leave a air space at least 4 inches from the slope of your roof right down to the outside way so you get air circulating through the roof vents and out through the soffits around your house.



User Icon
Date/Time11/4/2014 at 10:27:58 PM

When we have a renovation project and are asked to improve the insulation in the ceiling, we look at the age of the existing material and will adding more blown in insulation take the levels to high to provide the proper air flow back into the attic space.

More often than not I suggest we remove the existing. Then we can check for mold or have a look at the wiring that is up there. /better safe than sorry.

James Fram

Search the TrustedPros directory and discover the best contractors in your area.

Find your home service pro
Great renovations start with a great contractor.

Since 2004, TrustedPros has been helping homeowners find the right contractor for their home improvements and repairs.

Post Your Project

Within hours you'll be comparing offers from top-rated professionals. It's free to post and you're under no obligation to hire.

Trustedpros Inc. does not warrant the accuracy, completeness, safety, legality or usefulness of any Content, or Whether Content is Current and up-to-date, and TrustedPros Inc. Shall have no liability whatsoever with respect to your use or reliance upon any content or for content being removed or otherwise ceasing to be available. Please refer to the terms and conditions of use of this websites for more details.

Get Free Estimates

Post your project and compare offers from top-rated pros.