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HomeMy WebLinkAboutLetterMills, Short 8 Associates CIVIL I STRUCTURAL I SURVEYING I ENVIRONMENTAL CERTIRCATION of AUT ORI nnON 30698 April 29, 2020 St. Lucie County Building and Inspections 2300 Virginia Ave. Fort Pierce, FL 34982 THIS ITEM HAS BEEN DIGITALLY SIGNED & SEALED BYJASON W. SHORT, P.E., M.ASCE P.E. 469018 ON 05/01/2020 USING A DIGITAL SIGNATURE, Re: Re -Roof— Clarifications PRINTED COPIES OF THIS DOCUMENT ARE NOT CONSIDERED SIGNED & 5003 Green Dolphin St. SEALED, AND THE SRA AUTHENTICATION CODE MUST BE VERIFIED ON Fort Pierce, FL 34951 ANY ELECTRONIC COPIES. To Whom It May Concern: This letter is written to provide certification that I, as a Professional Engineer, have been retained to establish compliance with the 2017 Florida Building Code (61 Editions) & the St. Lucie County codes and regulations pertaining to the re -roof installation of materials at the address listed above. Based on review of the current 2017 (Existing) Florida Building Code the following has been determined: 1. The roof sheathing must be re -nailed and attached per the current FBC requirements; 2. A new, approved separator underlayment is being installed over the existing shingle roof; a. "Tarco Leakbarrier EasyLay UDL Synthetic Roof Underlayments" FL 916884-R1; 3. No tear off of the existing shingles is required as laid out in "Extreme Metal Fabricators, LLC" letter (attached herein)(ref: 2017 FBC-R Chapter 9, 2017 FBC Chapter 15); 4. Wind Design Parameters: a. Wind Speed: 160 MPH (VuLT) — 3 Second Gust 124MPH (V") —3 Second Gust *UsedjorAnalysis* b. Risk Cat: II c. Buid. Design: Enclosed d. Mean Roof: <=15' e. Roof Pitch: <=5/12 f. Exposure: C g. GCpi: +/-0.18 h. Adjust. Factor: 1.21 i. Wind Loads: Zl: +19/-31 PSF / Z2: +19/-62 PSF / Z3: +19/-62 PSF No other certifications are expressed or implied. The a eeing services addressed therein have been performed and based upon my professional engineering `,�Cnb�l'l�et 4y ical documentation, information and belief, and in accordance with commonly accepted > ) 6% with applicable standards of practice, and is not a guaranty or warranty, either expressed mbq�y&yhave any questions, please feel free to call meat the number listed below. _ Sin�2 : = JRso . J. ShortP.E,ftASCE ' P1irtrlis4£6tCginee-r,W �°.'..r P r' ���` •'i, HEMP, LQr?rpliance Letter, Tarco Florida Prod. App. - FL #16884-RI, EMT FL #17022.1 'ttttriltt+�`' Moin Offices: Additional Offices. 700 22M Place I Suite 2C/21) j 847 W.13w Ct., Suite 1 Vero Beach, FL 32962 m Riviera Beach, FL 33404 100 S. 2Rd Street, Ste 209 / 4620 Lipscomb St NE, Suite 2 Fort Pierce, FL 34950 Palm Bay, FL 32905 Phone Number: 772.226.7282 1 Website: w .MillsShortAssociatesxom i FABRICATORS To Whom It May Concern: As outlined in the Florida Building Code, Extreme Metal Fabricators, LLC will accept the installation of metal roofing panels over one layer of asphaltic shingles or modified bituminous roofing, assuming all requirements of the 2017 Florida Building Code Sixth Edition, all of Chapter 15, specifically Section1511 Existing Roofing, and/or 2017 Florida Building Code- Residential Sixth Edition, all of Chapter 9, specifically Section 905.10 and Reroofing Section 908 have been met. It is important to ensure the existing substrate is not deteriorated, there is no entrapped moisture, meets all code requirements, and to install an approved separator underlayment between the existing roofing and the metal panels, such as those that comply with ASTM D226 Type I or Type II or ASTM D 1970, or ASTM D 4869. The roofing contractor of record must verify the aforementioned requirements. Having confirmed code requirements, installation in this manner is approved by Extreme Metal Fabricators, LLC as the manufacturer. Plywood sheathing must be minimum 15/32" COX plywood or %" wood plank, solid decking, fastened per FBC requirements. The wood substrate must be inspected to ensure that it has not deteriorated and is acceptable as a suitable substrate for additional roofing, and is attached structurally per current codes. Fasteners used for metal roofing should penetrate minimum Yd' through structural deck)ng or a minimum of 1" penetration into a thicker wood substrate, to insure pull-out values remain the same. Consideration should be given to the unevenness of the underlying shingles, which may telegraph through the new metal panels. As in all metal roofing, 'oil canning" is an inherent condition that can occur in the panels. Care should be taken during the installation, to observe the metal panels as they are installed, and adjust installation procedures, if possible, to help to minimize "oil canning". "Oil Canning" is an aesthetic issue not a structural issue, and not a cause for rejection. The energy savings that is normally observed after a new metal roof replaces the previously shingled roof, which has been documented to account for 20% - 29% savings, may be negated due to the underlying shingles holding heat energy much longer than a metal panel installed without shingles beneath it. It is important to comply with all requirements of the Florida Building Code, Fire Rating requirements, and local code requirements. As always, authorities having jurisdiction, (building department) should be consulted, and approve your demolition and reroof installation methods, prior to beginning work. Extreme Metal Fabricators, LLC 2160 SW Poma Drive Palm City, FL 34990 © (772) 223-4055 (Phone) d (772)781-7492 (Fax) EYK ME