×
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

Roof Snow Stops

Roof Snow Stops

Roof Snow Stops

(OP)
When it comes to a metal roof with snow stops on it to prevent snow from sliding off, how are people treating this snow load condition?

1) Just assume typical unbalanced snow?
2) Some sort of snow piling effect...I'm not sure how to account for that
3) Different roof adjustment factors?

I'm not sure how to treat it. I know that there will be snow piling at that location, but maybe the unbalanced snow load accounts for this?

RE: Roof Snow Stops

If at an entrance, I try to encourage the Architect to put in a gable condition and still allow the shedding to occur, just reinforcing the valley area.

I will have to defer to others for their experience if this is not the case.

Mike McCann, PE, SE (WA)


RE: Roof Snow Stops

Metal roofs are usually considered "slippery", with snow stops I would consider a metal roof "non-slippery". Section C7.4 in the ASCE 7-10 offers a bit of guidance.

A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com

RE: Roof Snow Stops

1: I have used unbalanced or drift, whichever is bigger
2: I have not included 'piling on' effects. I have always viewed these as preventing the snow from moving. Once things start moving the resistance required to stop it moving gets pretty unreasonable and the roof framing/diaphragm can become problematic.

RE: Roof Snow Stops

agreed with medeek...the only difference the snow fence has made to me is that you cannot count on the snow sliding off of the roof. Typical snow fence is less than 16" tall anyway which is likely less than the basic accumulation of snow, so it makes sense that there wouldn't be any additional buildup on account of the guard.

RE: Roof Snow Stops

(OP)
Thanks for the info. I will be treating it as a "non-slippery" roof.

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