MINUTES
WIND MITIGATION WORKGROUP
Crowne Plaza Melbourne Oceanfront Hotel
1-800-980-6429
Wind Mitigation Workgroup Members Present
Representation Member
Commission/Roofing Chris
Schulte
Commission/Contractor Matt
Carlton
FRSA/Roofing Burt
Logan
Insurance Tim
Reinhold
FHBA Richard
Reynolds
Building Officials
1. Discussed Wind
Mitigation Retrofits Provisions for 2007
a.
Reviewed and Discussed Gable End Bracing Provisions:
Richard Reynolds provided a status of the revisions to Appendix A and stated that the drafts of Appendix A material will be available for review Monday, May 11, drawings by Friday, the 16th of May.
2. Reviewed and Discussed Other Wind Mitigation Retrofit Provisions: The Workgroup reviewed the working draft and provided the following comments and revisions:
611.7 101.1 When a roof covering on an
existing site-built - single family residential structure is removed and
replaced, the following procedures shall be permitted to be performed by the
roofing contractor:
(a) Roof-decking attachment andfor
fastenersing shall be strengthened and
corrected as required by Section 611.7.1 201.1.
611.7.1 201.1
Roof decking sheathing fastening attachment
and fastening for site-built
single family residential structures.
611.7.2 Roof secondary water
barrier for site-builtingle family residential
structures. A secondary water barrier shall be installed using one of the following
methods when roof covering is removed and replaced:
1. In either HVHZ or non-HVHZ regions,
a) All joints in structural panel roof sheathing or decking shall be
covered with a minimum 4 in. wide strip of self-adhering polymer modified
bitumen tape applied directly to the sheathing or decking. The deck and self adhering polymer modified
bitumen tape shall be covered with one of the underlayment
systems approved for the particular roof covering to be applied to the
roof.
bc) In the HVHZ, the entire roof deck shall be covered with an approved
asphalt impregnated 30# felt underlayment or approved synthetic underlayment installed
with nails and tin-tabs as
required for the HVHZ in
accordance with Sections 1518.4 of the Florida Building Code,
Building or R4402.7.2, R4402.7.3, or R4402.7.4 of the Florida Building Code, Residential. This method shall also
be acceptable in the non-HVHZ regions of (No additional underlayment shall be required over the top of this sheet). The synthetic underlayment shall be fastened in accordance with the
manufacturer’s recommendations.
e) Application of a two-part urethane based closed
cell spray-on adhesive to the attic side of the joints between the sheathing
and along both sides of the truss top chords or rafters shall be deemed to meet
the requirements for the secondary water barrier.
2. Outside the High Velocity Hurricane Zone:
a. The
entire roof deck shall be covered with an approved self-adhering polymer
modified bitumen cap sheet meeting ASTM D
1970 or an approved self-adhereing synthetic underlayment installed in accordance with the
manufacturer’s installation instructions. No additional underlayment
shall be required on top of this cap sheet for new installations.
b. d) In regions of of the HVHZ, Aan
underlayment system
approved for the particular roof covering shall be applied with the following
modification:
(1) For roof slopes that require one layer
of underlayment, complying with section 1507.2.3 of the
Florida Building Code, Building fastened as described below orA
a layer of approved asphalt
impregnated approved ASTM D 226 Type I or
Type II (#30) felt underlayment or
approved synthetic underlayment shall be
installed. The felt or synthetic underlayment
is to be fastened with 1” round plastic cap or metal cap nails, attached to a nailable deck in a grid pattern of 12 inches (305 mm)
staggered between the overlaps, with 6-inch (152 mm) spacing at the
overlaps. The
synthetic underlayment shall be fastened in
accordance with the manufacturer’s recommendations.
(2) For roof
slopes that require two layers of underlayment, an approved asphalt impregnated ASTM D 226
Type I or Type II (#30) underlayment
of 2:12 to 4:12 an additional layer of felt shall be installed in a
shingle-fashion and lapped 19” and fastened as described above. An approved
synthetic underlayment shall be installed in
accordance with the manufacturer’s installation instruction. (No additional underlayment shall be required over the top of this sheet).
201.3 611.8.1 Roof-to-wall
connections for site-built single
family residential structures. Where required by Section 611.8
101.2, the intersection of roof framing with the wall below shall be
strengthened by adding metal connectors, clips, straps, and fasteners such that
the performance level equals or exceeds the uplift capacities as provide
sufficient resistance to meet the uplift loads specified in Table 611.8.1
201.3 either because of existing conditions or through retrofit
measures. As an alternative to an engineered design, the prescriptive
retrofit solutions provided in Sections 611.8.1.1 201.3.12
through 611.8.1.6 201.3.45 shall be accepted as meeting
the mandated roof-to-wall retrofit requirements.
Exceptions:
1. Where it can be demonstrated
(by code adoption date documentation and permit issuance date) that
roof-to-wall connections and/or roof-to-foundation continuous load path
requirements were required at the time of original construction.
2. Roof- to- wall
connections shall not be required unless evaluation and installation of
connections at gable ends or all corners can be completed for 15% of the cost
of roof replacement. For house that have
both hip
The workgroup reviewed the Roof Gravel Criteria Proposal for 2007 Florida Building Code and made the following recommendation:
BALLAST. Ballast
is any item having weight that is used to hold or steady an object.
In roofing, ballast comes in the form of large stones or paver
systems or light-weight interlocking paver systems
and is used to provide uplift resistance for roofing systems that are not
adhered or mechanically attached to the roof deck.
1. ADJOURNED: 10:30 am