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Question DetailsAsked on 9/12/2019

Best way to add insulation to flat roof house without attic (Mckay home)

I live in a McKay home with flat roof and concrete slab. It gets very cold during winter and the heat doesnt stay inside for long. Its not a big problem during summer, as heat quickly dissipates.The previous owners changed the roof (roof is in a good shape) but did not add insulation.

I am contemplating adding insulation to the roof. I have got quotes for 3 different methods.

1. Spray Foam insulation - Apparently providers very good insulation but can have leaks and other issues.
2. Put a layer of ISO board in between the roof panels
3. Put a layer of radiant barrier in between roof panels

I would like to hear some expert opinion comparing the three options and advice me on which one is the best for keeping the heating cost down. I would also like to make sure the solution involves less (ideally none) maintenance and long lasting benefits (at least 10-20 years).

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2 Answers

0
Votes

Am old home improvement contractor not an insulation contractor. From my weatherization experience once roofing has been replaced any sheathing or radiant barrier is not a viable solution. Spray foam must have drywall (or other material inbetween) it and living space. By all means go that route if possible. High R values, an to my knowledge- an airtight barrier is a given. I was a weatherizer when Carter was in office. Radiant barrier needs dead air space and no dust to work.

JIm Casper

Omaha Ne

Answered 2 months ago by JimCasper

0
Votes

When i say spray foam insulation, I am talking about "Spray Polyurethane Foam" with a protective coating on top (for waterproofing) thats typically used for roof. Is that way more superior to ISO board and radiant barrier ?

Source: https://dura-foam.com/foam-roof-system/

Answered 2 months ago by ursvasan




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