HomeMy WebLinkAboutMISC LETTERMATHERS ENGINEERING
CORPORATION
Existing Recovering Recovering
Date: June 4, 2018
For: Plan Reviewer
St. Lucie County Building Department
2300 Virginia Avenue
Fort Pierce, Florida 34982
RE: Permit No. 1805-0318
Commercial Circle Investments LLC
7413 Commercial Circle, Fort Pierce, FL 34951
2431 SE Dixie Highway
Stuart, FL 34996
Phone: (772) 287-0525
License #EB004456
SCgVNED
5 Lucie COUnty
The work will consist of a Polyurethane Foam Roof System recover over the entire roof of the
above referenced building. This report is based on the review of the product information for
applicable Florida Building Code 2017 (6a' Edition), approval of materials and installation.
The sequence of work shall be as follows:
Per Lapolla Spray Polyurethane Foam - Foam Lok LPA 2500, 2800, 3000 over Steel
Decks Installation (N.O.A. +1=3UO 04 08)-metal surfaces are to be primed with Therm-
O-Prime according to the LAPOLLA Industries Inc and coating manufacturer's
recommendations. Primer shall be thoroughly cured prior to application of form.
Spray apply a minimum of 1"of 2.8 lb. density polyurethane foam over existing steel
roof deck.
• Coat all flashing and parapets with Lapolla elastomeric coating (25 mils) to the
polyurethane at a minimum rate of 3.0 gallons per 100 sq. ft.
The following materials were used in this repair (see attached manufacturers specifications):
• Lapolla Spray Polyurethane Foam -Foam Lok LPA 2500, 2800, 3000 over Steel Decks
Installation per N.O.A. # l@-r040A4TQ
• Lapolla Industries, Inc. Therm-0-Flex TF 1000 Series Elastomeric Roof Coating
Installation per N.O.A.1=6 055,-09-
The above sequence is general in nature and may have to be modified as restoration work
progressed during installation of the Foam Roof System over the building.
This alternation is to enhance the insulation value, and enhance the moisture resistance of the
existing roof system. The N.O.A. indicates the "Spray Polyurethane Foam - Foam Lok LPA 2500,
2800, 3000 over Steel Decks" Roof System has a-212.15 psf allowable wind uplift load for recover
over steel deck membranes.
This is greater than the calculated windload uplift component generated by a 170 mph-3 second
gust, Exposure C, event on a roof pitch 0 to 7 degrees commercial roof system. Worst case wind
pressure-169.96 psf (See the following Table) below.
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MATHERS ENGINEERING
CORPORATION
MRH = 20 ft Lamda = 1.29 for Expos. C
Zone s s
1
10
1 27.35
67.34
1
20
25.67
65.60
1
50
23.41
63.27
1
100
21.67
61.53
2
10
27.35
112.94
2
20
25.67
100.88
2
50
23.41
85.01
3
10
21.67
73.01
3
20
27.359:
3
50
25.67
i 140.74
2431 SE Dixie Highway
Stuart, FL 34996
Phone: (772) 287-0525
License #EB004456
Per the "Roofing permit application summary of supplemental information" since the maximum
design pressure of the roof covering is greater than the minimum roof uplift pressures enhanced
nailing is not required.
Based on the Florida Building Code — Existing Building provisions, the roof repairs and alterations
do not structurally alter the existing roof structural system and a requirement to upgrade it by this
permit application is not warranted.
Installation of the PUF roof system shall be based on the 2017 Florida Building Code (6 h Edition)
Section-1U2L 18 to ensure that the PUF system Product Approval has been carried out with
satisfactorily results.
Information on work sequences, and materials were supplied by Whiting Construction. Mathers
Engineering Corp. confirms that the materials meet the windload requirements of the Florida
Building Code.
Limitations:
Our professional services have been performed, our findings obtained and our opinions prepared in
accordance with general accepted engineering principles and practices. This company is not
responsible for the conclusions, opinions or recommendations made by others based on our
findings.
Approved by: 0�III
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William J. MatherSTATE OF �AZZ
Florida License #1 5it" COR10 mow\
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