Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.


Link To This Forum!

Partner Button
Add Stickiness To Your Site By Linking To This Professionally Managed Technical Forum.
Just copy and paste the
code below into your site.

Removing Roof Space Sheating for Radiant Barrier OSB

Removing Roof Space Sheating for Radiant Barrier OSB

1917 Craftsman Bungalow

2 layers of composition shingles over 1 layer wood shake shingles attached to 1 x 4 space sheathing with 4 inch spaces.

I am reroofing and will need to resheath the house.

I want to install 7/16 OSB with a radiant barrier attached to one side.

Can I remove the space sheathing boards and install the OSB directly to the rafters?

RE: Removing Roof Space Sheating for Radiant Barrier OSB

rafters are 24 inches on center

RE: Removing Roof Space Sheating for Radiant Barrier OSB

Why wouldn't you?  Not sure I understand why you would question this as most houses have sheathing attached directly to 2x4 rafters.

RE: Removing Roof Space Sheating for Radiant Barrier OSB

But on the other hand, why would you?  The boards shouldn't do any harm.  You would just have to use longer fasteners.

RE: Removing Roof Space Sheating for Radiant Barrier OSB

...and radiant barriers in attics don't work anyway!  Don't waste your money on the radiant barrier.  Re-sheath with or without removal of the present boards..not a big deal either way as long as the additional weight doesn't present a problem.

RE: Removing Roof Space Sheating for Radiant Barrier OSB


My thoughts were that doing the project as described wouldn't be a big deal.  I am curious if the 7/16 OSB is strong enough to span the 24 inch on center rafters.  This was really my big concern and I though I would check with some of you to see if I was missing something.  

As far as the comment about radiant barriers not working in the attic to reflect summer heat... is my information in the link incorrect.  The space is finished directly below the roof (finished attic) but it gets unbearably hot in the summer unless the 220 window AC and the 110 window AC are on full blast; then only tolerable.   

RE: Removing Roof Space Sheating for Radiant Barrier OSB

I'd like a clarification on Ron's statement as well.  A lot of us think that radiant barriers work, and some claim to know that they do.

RE: Removing Roof Space Sheating for Radiant Barrier OSB

Most attic heat is a result of thermal transfer between the exterior face of the roof and the interior of the attic.  Insulation will help that.  Radiant barriers generally have high thermal conduction (e.g., aluminum facings).  They work fine for light emitted heat (by reflection) but less so for non-light thermal transfer. (although there is a significant anomaly in that as well...go out and put your hand on a chrome trim piece on your car on a 90F's hot)

Perhaps my experience is anecdotal....comments please.

RE: Removing Roof Space Sheating for Radiant Barrier OSB

My experience is totally anecdotal, but in our hot climate, houses and commercial buildings typically have aluminum foil sarking or aluminum foil faced batts installed directly under the roofing.  Maybe this is the wrong forum for good advice on this.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


White Paper: Agile Product Engineering and Improved Product Outcomes
Today’s product development cycle is fraught with difficulties. Increased demands for complex functionality and reduced product development windows cause engineering teams to borrow practices from the IT industry, swapping outdated serial workflows for a more flexible and collaborative design method known as Agile Product Engineering. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close