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


Typical Internal Pressures for Reg B

Typical Internal Pressures for Reg B

Typical Internal Pressures for Reg B


What are typical internal pressures that people are using for Region B. I have traditionally assumed that the building is permeable and always used a Cpi=0 to -0.3. However I am designing a building with large glazed areas and it was suggested that the building be designed with dominant openings. This increases the internal pressures to Cpi=-0.5 to +0.7 (assuming that the dominant opening may occur on the windward or leeward/sidewall).

I attended an EngAust seminar late last year about the Brisbane windstorms of 2008 hosted by the guys from James Cook Uni, and they really recommended that full internal pressurization be accounted for unless it is proven that the windows can resists impact from flying debris (as typically designed for in regions C and D).

ASCE7 section 6 only considers open, partially enclosed and enclosed buildings for internal pressures (0;-0.55 to +0.55 and -0.18 to +0.18 respectively).

Technical Paper on Brisbane windstorms attached.


RE: Typical Internal Pressures for Reg B

Cam & John have spent a lot of time at wind affected regions. Their discussions about garage doors being under designed have opened up a can of worms for people in the shed industry. However on the wind born debris situation, and internal pressures, my opinion is that is all has to do with wind speed. If you wind speed is high, then yes 0.7,-0.5 would be smart, however if it is low, 0.2,-0.3 is preferred by me.   

Arguing with an engineer is like wrestling with a pig in mud. After a while you realize that they like it

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!


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