MyFloridaCode.com

Here is my take on it........

You are performing a Level 1 alteration.  The code says that you can not 
make the building less safe or less energy efficient than it already is.
You can not install a  unit that weighs more than 105% of the  prior unit 
without evaluating the structure supporting the replaced equipment.
Assuming that you are not doing any of the above then you should be able to 
mount the new unit to the existing support ......... unless the new 
equipment is not designed for that type of support.

as always jmho,

glen mast



----- Original Message ----- 
From: "Dan Griffin" <Daniel at weatherengineers.com>
To: <codetalk at myfloridacode.com>
Cc: <jan_leggettheatingandair at comcast.net>; "Cheryl Harris at FRACCA" 
<Charris at FRACCA.org>
Sent: Wednesday, November 19, 2008 11:52 AM
Subject: [Florida Code Talk] Existing Roof Mounted unit


>I have a question as the code is being interpreted between 2 counties as
> different.
>
> We have a condensing unit located on a residential roof 20 years old &
> we changed it out & secured it to the existing timbers. The county the
> change out is in says we must raise the unit to a stand, now on 4x4's.
> Another county says if we were in their county we can put it back where
> it was on 4x4's.
>
> I read the code & understand, we would only raise the unit if the job was:
>
> 1. New construction or
> 2. If we were relocating it from the ground to the roof (never been on
> the roof before).
>
> Please set us straight & tell me the truth.
>
> Thanks, Dan
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