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RE: Re-roof on 1950's building

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The existing gravel and built-up roof will be removed all the way down to the light weight concrete deck. The original roof framing will remain intact though. In any case the additional weight of the wood framing would probably not exceed the current weight of the gravel and membrane roof system it will be replacing.

 


From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)gmail.com]
Sent: Friday, February 01, 2008 3:04 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Re-roof on 1950's building

 

Your gravity loads would be going up if I'm understanding correctly. You are "overlaying" a secondary roof without removing the original roof system and roof framing...



-gm

On Feb 1, 2008 11:56 AM, mail <mail(--nospam--at)strand-engineering.com> wrote:

This would be going over the top of existing construction. Bigger question to me is am I assuming liability for the entire structure by re-designing the roof system (gravity loads are less, but lateral would increase a little), in which case I would need to analyze everything existing? Or am I only responsible for the portion that I design?

 


From: Gerard Madden, SE [mailto:gmse4603(--nospam--at)gmail.com]
Sent: Friday, February 01, 2008 2:51 PM
To: seaint(--nospam--at)seaint.org
Subject: Re: Re-roof on 1950's building

 

First thing to check is to see if it's okay to introduce a combustible material into the buidling.

or are you trying to go over the top of the existing contruction? (i.e. above the existing conc. filled deck) to somehow keep the structure weathertight during construction?

-gm

On Feb 1, 2008 11:19 AM, mail <mail(--nospam--at)strand-engineering.com> wrote:

I have a customer who wants to retrofit a roof system on a school building built in the 1950's. The existing construction is concrete joists with metal deck, lightweight concrete and a built up flat roof. The customer wants to install a wood truss roof system with bearing on purlins spaced every few feet on the lightweight concrete deck instead of simply replacing the current flat roofing in order to avoid water problems and so forth.

 

What is the proper procedure for addressing a building this old? I feel confident that I could design the roof truss system and even the anchorage to the existing framing, but what is the extent of my responsibility? I am unfamiliar with any existing building codes and new to the addition game, so any advice would be appreciated.

 

Taylor W. Motley, PE

Strand Engineering, LLC

224 Daytona St. 6

Conway, SC 29526

 

 

 




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-gm




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