×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

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!
  • Students Click Here

*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.

Students Click Here

Jobs

Rigid Roof Insulation Weight

Rigid Roof Insulation Weight

Rigid Roof Insulation Weight

(OP)
ASCE states that rigid roof insulation weighs 1.5 psf per inch of thickness, whereas, polyiso insulation, like Thermax, is < 0.25psf per inch.

Is there a reason why ASCE might be so much heavier? Is it assuming some sort of saturation?

RE: Rigid Roof Insulation Weight

ASCE tabulated weight values are known to be conservative, if you can justify a lesser weight with documentation and you need that extra weight savings then feel free to do so

RE: Rigid Roof Insulation Weight

or just a catch all for any rigid roof insulation.

Dik

RE: Rigid Roof Insulation Weight

Maybe once the membrane is shot, they assume it absorbs water :>

RE: Rigid Roof Insulation Weight

I'm looking into this at the moment and stumbled across this thread.

I have no problem using the catch-all value for normal gravity design, my issue is with the wind uplift, you would want to use a more accurate value.

RE: Rigid Roof Insulation Weight

The ASCE number is way off compared to what is typically used for rigid insulation. Use a value based on whatever product they're specifying.

RE: Rigid Roof Insulation Weight

The 1.5 psf/in is consistent with lightweight insulating concrete. Rigid board insulation is much lighter.

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!


Resources