Do you think the head of a carriage bolt would be a problem?

From: Eric Kuhnke 
Sent: Tuesday, January 12, 2016 8:11 AM
To: af@afmug.com 
Subject: Re: [AFMUG] Non Pen Mount Question

Rubber mats are almost always required when on a membrane roof. Not used if on 
gravel/rocks. Please no protruding bolt heads, the bottom of a nprm  needs to 
be FLAT. 

roofs like this:

https://www.google.ca/search?q=white+membrane+roofing&num=100&prmd=ivsn&source=lnms&tbm=isch&sa=X&ved=0ahUKEwiMgba8x6TKAhXGLmMKHRVGAgcQ_AUIBygB&biw=360&bih=559&dpr=3

On Jan 11, 2016 10:37 AM, "Chuck McCown" <ch...@wbmfg.com> wrote:

  If the mount has the head of a carriage bolt coming though on the bottom, 
will this be a problem?  Now smooth does the bottom want to be?  Are weld beads 
OK.

  Do you always use rubber mats under them?

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