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gig'. JONESVILLE:
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352-498-0778
SUPPLY & MANUFACTURING
www.gul fcoastsuppl ycom
MEMORANDUM
Date: 22 May 2019
To: Roofing Professionals
From: Gulf Coast Supply and Manufacturing
Subject: Gulf Coast Supply Product Installation on Single Layer of Shingles
ANALYSIS: "Recovering" a roof by installing a new roof covering over an existing roof
covering is permitted in certain circumstances under most building codes. Gulf Coast Supply and
Manufacturing(GCSM)maintains a number of Florida Product Approvals(FPA)that are
contingent on engineering analysis and product testing in accordance with the requirements of
FL Statutes 61 G20-3.005. Structural analysis of these roofing systems indicates that a layer of
shingles has no impact on the uplift capacity of the roofing system. Therefore,the uplift capacity
reported in each FPA remains valid when installed over a single layer of shingles.
APPROVAL: This memo is to approve the installation of metal roofing systems over an existing
single layer of shingles for FPA numbers 11650, 11651, 16646, and 18473. GCSM does not
require a new layer of underlayment provided that the existing layer of roofing continues to
function as a watertight barrier. This approval is contingent on the following:
a) Five-fold criteria of FBC 1511.3 or FBC Residential R908.3 (or comparable IBC or.other
code section) must be satisfied.
b) Fastener penetration must-meet the minimum value specified in the applicable FPA.
c) Product must be installed in accordance with manufacturer's recommendation, all
applicable building codes, and the conditions of the applicable FPA.
d) Installation shall be ove 1 x4 battens>
similar),or any code-approved underlayment, or
another suitable slip sheet. eta panels shall NOT be installed in direct contact with
existing shingles.
This memo supersedes all previous correspondence on the subject. This approval will remain in
effect until superseded, rescinded or until one year after the publication date listed. This approval
may be retroactively applied. This is a.manufacturer's approval only—always consult your local
building codes and building department for code compliance concerns. If further information is
required,please contact Gulf Coast Supply and Manufacturing at(352) 498-0778.
Gulf Coast Supply &
Manufacturing, LLC Jared Pearce
(888) 393-0335 Technical Services Manager
14429 SW 2nd Place Suite G-30 Gulf Coast Supply and Mfg.
Newberry, FL 32669