Issue: DCA09-DEC-129. The Petitioner is requesting clarification on whether a premixed lightweight cementitious mortar-type adhesive can be approved under the State Product Approval for installing hip and ridge tile in the HVHZ. The Petitioner provides for the following questions:
Background:
Situation: the product in question “a premixed lightweight cementitious mortar-type adhesive is approved for use with both field tile and hip and ridge tile by the Florida Building Code under approval Number FL 7233, based on appropriate SSTD 11-99 testing and Miami-Dade County NOA06-0329.04 (Non-HVHZ).
Premixed lightweight mortar-type adhesive is approved for all tile profiles, except hip and ridge tile under approval FL 520 based on series of tests per Miami-Dade TAS 101and TAS 123 and has NOA 06-0329.05.
2007
104.11 Alternative materials, design and methods of construction and equipment. The provisions of this code are not intended to prevent the installation of any material or to prohibit any design or method of construction not specifically prescribed by this code, provided that any such alternative has been approved. An alternative material, design or method of construction shall be approved where the building official finds that the proposed design is satisfactory and complies with the intent of the provisions of this code, and that the material, method or work offered is, for the purpose intended, at least the equivalent of that prescribed in this code in quality, strength, effectiveness, fire resistance, durability and safety. When alternate life safety systems are designed, the SFPE Engineering Guide to Performance-Based Fire Protection Analysis and Design of Buildings, or other methods approved by the building official may be used. The building official shall require that sufficient evidence or proof be submitted to substantiate any claim made regarding the alternative.
1518.8 Clay and concrete roof tile. Tile shall be clay, concrete or composition material of various configurations complying with the physical property requirements of this code. All tile and tile systems shall be tested in compliance with the provisions set forth in Section 1523. Tile shall have a product approval for a complete tile system, which shall include the tile, underlayment and all tile related accessories required to provide a waterproof system.
1518.8.1 Application. All tile systems shall be installed over solid sheathed decks. All tile installation shall be in accordance with RAS 118, RAS 119, and RAS 120, as applicable.
RAS 118, 119:
D. Hip and Ridge Tile Installation - CHOOSE ONE of the following:
1. Self-adhered Membrane:
(aa) Install self-adhered membrane over nailer board and seal to tile surface per membrane manufacturer's recommendation.
(bb) Install hip and ridge tiles with corrosion resistant approved nails or screws and of sufficient length to penetrate a minimum of 3/4 in. into nailer board lapping tile a minimum of 2 in. (Approved adhesive, in lieu of nails or screws, is permitted when using Details 2 and 3. When using adhesive, hip and ridge tiles shall be installed in accordance with the adhesive manufacturer's Product Approval.)
(cc) Use approved adhesive or clips at overlaps.
2. Mortar:
(aa) Set hip and ridge tile in a continuous bed of mortar, lapping tile a minimum 2 in. Ensure bed of mortar does not protrude in center of hip or ridge junction. Approximately 1 inch (25 mm) of field tile shall extend beyond bed of mortar.
(bb) Install hip and ridge tiles with approved corrosion resistant tile fastener of in lieu of nails or screws, is permitted when using Details 2 and 3. When using adhesive, hip and ridge tiles shall be installed in accordance with the adhesive manufacturer's Product Approval.)
(cc) Point mortar to finish surface.
Analysis:
(1) The
State Product Approval System is limited in scope to products that are subject
to performance standards by the
(2) Approval
of alternatives to prescriptive requirements of the
Staff recommendation:
Question #1: Can we use SSTD-11-99 testing results for hips and ridges as a basis for obtaining approval for the use of the mortar adhesive system in the HVHZ?
Answer: No. The product in question falls outside the scope of Rule 9B-72.
Question #2: Should a hip and ridge system with demonstrated performance that is equal or superior to the current system in use in the HVHZ be allowed?
Answer: Yes. Subject to approval of the local authority have jurisdiction.
Question #3: Should the Commission issue a declarative statement supporting the use of a new technology such as the mortar adhesive hip and ridge tile system in all areas of the state based on the fact that it exceeds the state minimum Building Code requirements?
Answer: No. The Commission has no authority to approve alternative to a prescriptive requirement of the Code.