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Counter-flashing

By Mary Walker,2014-12-19 03:40
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Final Supplement 2007 Florida Building Code Test Protocols for High Velocity Hurricane Zones 1 RAS 111 Standard Requirements for Attachments of Perimeter Wood Blocking and Metal Flashing. Section 3.6.1 change to read as shown. 3.6.1 Anchors used for woodblocking attachment to structural concrete shall have a minimum nominal diameter (including the m..

    Final Supplement 2007 Florida Building Code

    Test Protocols for High Velocity Hurricane Zones

    RAS 111 Standard Requirements for Attachments of Perimeter Wood Blocking and Metal Flashing.

Section 3.6.1 change to read as shown.

    3.6.1 Anchors used for woodblocking attachment to structural concrete shall have a minimum nominal diameter (including the minor root diameter) of 0.250 in.; therefore, a

    threaded concrete anchor or insulation fastener with a nominal ? in. diameter shall not be

    acceptable. [Mod 2043]

    Section 7.2 General Attachment Requirements. Change to read as shown.

7.2 General Attachment Requirements

    7.2.2 Counter-flashing attachment points shall be elevated not less than 8 in. above the finished roof surface. Where existing job conditions do not allow counter flashing to be 8 in. above finished roof surface, the counter flashing may terminate 4 in. above the finished roof surface. Parapets less that 8‖ above finished roofing must be flashed to the outside edge and include a metal flashing which extends minimum 1‖ below the finished exterior system. [Mod 2534r]

Sections 7.5.5 and 7.5.6 change to read as shown.

    7.5.5 Stucco counter-flashing attachment points shall be elevated not less than 8 in. above the finished roof surface. Where existing job conditions do not allow stucco counter flashing to be 8 inches above finished roof surface, the counter flashing may terminate 4 in. above the finished roof surface. Parapets less that 8‖ above finished

    roofing must be flashed to the outside edge and include a metal flashing which extends minimum 1‖ below the finished exterior system.

    7.5.6 The base water shedding layer behind the stucco or siding element, where required, shall terminate over top of the vertical leg of the stucco counter-flashing. Vertical leg of the stucco counter-flashing shall be set in a bed of approved mastic prior to mechanical attachment or sealed in a three course application of asphalt based mastic and minimum 4‖ wide fiberglass membrane following mechanical attachment (see Figure

    6). [Mod 2533r]

Section 9.5 change to read as shown.

    9.5 All vertical junctions shall be provided with a cant strip. Base flashing shall extend

    a minimum of 4 in. above the cant strip 8‖ above finished roofing. Membranes shall

    not be angled up or down greater than 45 degrees where exposed as part of the

    waterproofing layer unless specifically detailed in roof assemblies published

    literature. Published detailed drawings shall be submitted with the Uniform

    Building Permit Application to the building official for review. [Mod 2535]

Section 10 change to read as shown.

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    10.1 Termination bars may be fabricated in a variety of shapes and profiles and should be fabricated from materials having a high stiffness coefficient to evenly distribute the loads incurred on fasteners. If the termination is a flat bar, the minimum thickness shall be 3 / 1 in. If the termination bar has a reinforcing angle or rolled edges, thickness may be reduced to shall be1 / 8 in. providing the metal profile does not bow between fasteners.

    Termination bars shall be a minimum thickness of 1/8 inch.

10.2

    ? A nonferrous metal bonded sealing washer shall be installed under the head of each fastener or anchor if the fastener head is left exposed. Fasteners used in the installation of termination bars to be covered by counter flashing shall not require bonded sealing washers.

? A continuous bead of approval sealant shall be applied under or at the top edge of the

    termination bars which are not covered by counter flashing. to prevent water entry. [Mod

    2537r]

RAS 115 Standard Procedures for Asphaltic Shingle Installation

Section 3 General. Change to read as shown.

3. General

    3.1 Asphaltic shingles shall not be installed on roof mean heights greater than 33 feet, unless specifically specified in the roof assemblies assembly‘s Product Approval. Roof

    slope criteria shall be in accordance with Table 1515.2.

    3.3 Asphaltic shingles shall be installed in compliance with the Product Approval installation drawings specifications, but in no case with less than six approved roofing

    nails (12 ga. by 1? in. corrosion-resistant annular ring shank roofing nails) or approved fastening devices which penetrate through the sheathing or wood plank a minimum of 3 / 16 in. or penetrate a 1 in. or greater thickness of lumber a minimum of 1 in. except where architectural appearance is to be preserved, in which case a minimum of ? in. nail may be used. [Mod 2513r]

Section 4 Underlayment. Change to read as shown.

4. Underlayment

    4.2 All underlayments shall be fastened with approved minimum 12 gage by 1? in.

    corrosion-resistant annular ring shank roofing nails fastened trough through minimum 32

    gage by 1 5/8 in. diameter approved tin caps. Maximum fastener spacing shall be 6 in. o.c.

    at the laps with two additional rows in the field at a maximum spacing of 12 in. o.c. Nails shall be of sufficient length to penetrate through the sheathing or wood plank a minimum of 3 / 16 in. or penetrate 1 inch (25 mm) or greater thickness of lumber a minimum of 1 in., except where architectural appearance is to be preserved, in which case a minimum of

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    ? in. nail may be used. [Mod 2513r]

Section 6.7 change to read as shown.

    6.7 Rake and Vvalley courses shall be terminated with shingles not less than 12 in. in

    length. Rake courses shall terminate with shingles not less than 6‖ in length. To

    obtain the correct exposure for square-tab strip shingles, align the butts with the

    top of the cutouts in the course below. Install no-cutout shingles and those with

    variable butt lines according to the manufacturer‘s directions to obtain correct

    exposure. [Mod 2041]

    RAS 117 Standard Requirements for Bonding or Mechanical Attachments of Insulation Panels and Mechanical Attachments of Anchors and/or Base Sheets to Substrates

Sections 10.4.2 and 10.4.3 change to read as shown.

    10.4.2 Determine the number of square feet per fastener…[no change to text]. [Mod 2174r]

Side Lap Row:

1 fastener x 12 in x 37.5ft x 1 row = 37.5 fasteners

     12 in ft row square square

Center Row:

     2

    1 fastener x 12 in x 37.5 ft x 1 rows = 37.5 fastners

     24 in ft row square square

10.4.3 Determine the ―fastener value:‖

     2 100 ft

     square 23 ____________________________________________ = 1.33 ftper fastener

37.5 side lap + 37.5 center row(s) 3 ___ fasteners x _____ fasteners = 1.33 ftper fastener

     square square

10.4.3 Determine the ―fastener value:‖ [Mod 2174r]

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    Final Supplement 2007 Florida Building Code

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General Equation: 2f = (max. design pressure) x (ft per fastener) y

f = y2F x 45 lbf x 1.33 ft = 60.0 lbf y2 ft fastener

RAS 118 change to read as follows:

    ROOFING APPLICATION STANDARD (RAS) No. 118

    INSTALLATION OF MECHANICALLY FASTENED ROOF TILE SYSTEMS

    System Two: Direct Deck & Counter Battens Only

    1. Scope

    This application standard covers the procedures for installation of

    mechanically fastened roof tile systems on direct deck or counter battens only.

    This standard shall be used in conjunction with the tile manufacturer‘s

    Product Approval and RAS 127 .

2. Definitions

    For definitions of terms used in this application standard, refer to ASTM 1079

    and the Florida Building Code, Building.

     NOTE #1: The following table provides the contractor with the choices

    available for underlay underlayment systems. These systems can only be used

    on pitches designated in the table below:

     NOTE #2: All approved tiles with integral batten-lugs, installed on

    counter battens may be installed on slopes greater than up to and including

    7:12. Above 7:12 horizontal battens are required unless restricted by product

    design (tile without batten lugs). When utilizing horizontal battens comply

    with RAS 119.

    This roofing application standard covers Flat, Low and High profile roof tile,

    using a minimum 3- in. tile headlap, or design limited headlap as specified in

    the tile manufacturers Product Approval, on minimum 15/32 -in. solid decking

    nailed in compliance with Chapter 23 (High-Velocity Hurricane Zones) of the

    Florida Building Code, Building.

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    Plastic or

    Compatible

    Roof Counter

    Roof Choice of Battens or Cement at Reference Pitch Underlayment Direct Nails Deck

    Penetrating

    Underlayment

    4:12 or Either 1. ASTM D226 Required 3.01A

    Type II (#30) or greater ASTM D 2626

    (#43) organic base

    sheet nailed to

    deck, min. (#90)

    ASTM D249 D

    6380, Class M or

    WS, Type II

    organic cap sheet

    set in t Type IV

    hot asphalt.

     Either 2. Any Product Per Product 3.01B,

    Approval Approval C or D

    Approved

    underlayment

    system with

    mechanically

    fastened base

    sheet, and cap

    sheet set in hot,

    cold or self-

    adhered.

     Either 3. Product Per Product 3.01E

    Approval Approval Listed

    Approved nail-on

    single-ply

    underlayment.

    PART I - GENERAL

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    1.01

    A. Tiles shall not be installed over wet underlayment where moisture prohibits

    adhesion of mastic, mortar or adhesive.

    PART II - MATERIALS

    2.01 Fasteners:

    A. Tile Fasteners

    1. All roof tile nails or fasteners, except those made of copper,

    monel, aluminum, or stainless steel, shall be tested for

    corrosion in compliance with TAS 114, Appendix E, Section 2

    (ASTM G 85), for salt spray for 1,000 hours. Tile fasteners

    used in coastal building zones, as defined in Chapter 16 (High-

    Velocity Hurricane Zones), shall be copper, monel, aluminum

    or stainless steel.

    2. All roof tile fasteners shall be of sufficient length to penetrate a

    minimum ? in. through the thickness of the deck or batten,

    whichever is less, or to penetrate into a 1 in. or greater,

    thickness of lumber not less than 1 in.

     refer to Product 3. Storm clips and storm clip fasteners

    Approval with fastener penetration as above.

    B. Underlayment Fasteners:

    1. Fasteners shall be in compliance with this Section 1523 of the

    Florida Building Code, Building (Herein referred to as

    ―Approved Fasteners‖).

    (aa) Nails shall be minimum 12 gage, annular ring shank

    nails having not less than 20 rings per inch; heads not less than

    3/8 in. in diameter; and lengths sufficient to penetrate through

    the plywood panel or wood plank decking not less than 3/16 in,

    or to penetrate into a 1 in., or greater, thickness of lumber not

    less than 1 in. Nails shall be hot dipped; electro or

    mechanically galvanized to a thickness sufficient to resist

    corrosion in compliance with Appendix E of TAS 114 . All

    nails shall have Product Approval be Miami-Dade listed for

    corrosive resistance. All nail cartons or carbon labels shall be

    labeled to note compliance with corrosion resistance

    requirements. No roof material shall be fully or partially

    adhered (not to include mechanically attached) directly to a

    nailable deck.

    (bb) Such fasteners shall be applied through ―tin caps‖ not

    less than 1 5/8 in. and not more than 2 in. in diameter and of

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    not less than 32 gage (0.010 inch) sheet metal. All tin caps

    shall have Product Approval be Miami-Dade listed for

    corrosive resistance.

    (cc) Prefabricated fastener systems complying with Section

    1517.5, may be used, provided they have Product Approval are

    Miami Dade listed for corrosive resistance.

    2.02 Metal Flashing:

    A. Flashing materials shall comply with the requirements set forth in

    Chapter 15 (High-Velocity Hurricane Zones) of the Florida Building

    Code, Building.

    1. Metal accessories for roofs shall be not less than 26 gage

    galvanized or , 28 gage stainless steel, 16-ounce copper, 0.025-

    inch (.64 mm) 0.024 inch (0.61 mm) thick aluminum, lead

    sheet with a minimum 2.5 pound per square foot (psf) or

    equivalent noncorrosive lead metal alloys or composite

    materials manufactured for use as roof termination. All

    composite and nonmetallic flashing materials shall have

    Product Approval.

    2. Metal accessories may be of a manufactured, shop fabricated or

    field fabricated type, provided the materials and fasteners are in

    compliance with the minimum requirement of this Code and

    shall be installed in compliance with methods set forth in RAS

    111 .

    2.03 Asphaltic aAdhesive:

    A. Asphalt plastic roof cement conforming to ASTM D 4586, Type I,

    nonasbestos, non-running, heavy body material composed of asphalt

    and other mineral ingredients.

    B. Cold process modified bitumen roofing mastic conforming to ASTM

    D 3019, Type III.

    C. Asphalt conforming to ASTM D 312, Type IV.

    2.04 Adhesive/Sealant:

    A. Structural bonding adhesive conforming to ASTM 3498.

    2.05 Mortar:

    A. Materials:

    1. Roof tile mortar shall either be a premixed unit having Product

    Approval and tested in compliance with TAS 123 or a job-site

    mix approved by the building official and in compliance with

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    RAS 113.

    B. Mixes:

     1. Sand/cement mixes, job mixed or premixed, shall meet ASTM C

    270 requirement for Type M mortar (2.25 to 2.5:1 sand to cement

    ratio).

     2. Lightweight aggregate/cement mortar must be premixed and

     bagged.

    2.06 Eave Closure. CHOOSE ONE of the following:

    A. Prefabricated EPDM synthetic rubber conforming to ASTM D 1056.

    B. Prefabricated metal eave closure must contain minimum 3/8 in.

    diameter weepholes, spaced not more than 12 in. apart, flush with the

    underlayment.

    C. Prefabricated concrete or clay eave closure.

    D. Mortar (color optional) on granular surface underlayments only.

    E. Antiponding drip edge.

    2.07 Sheathing material shall conform to APA-rated sheathing, in compliance with

    Chapter 23 (High-Velocity Hurricane Zones) of the Florida Building Code,

    Building.

    A. Battens material to be decay resistant species or pressure treated in

    compliance with AWPA C2.

    1. Battens shall not be bowed or twisted.

    2. Vertical battens shall be a minimum of nominal 1 in. by 4 in.;

    horizontal battens shall be a minimum of nominal 1 in. by 2 in.

    [Mod 2561r]

    Part III change to read as shown.

    PART III EXECUTION

    3.01 Underlayment aApplications CHOOSE ONE of the following:

     NOTE #3: Anchor/base sheet shall have a minimum of two plies in the

    valleys. A No. 30 or No. 43 can be used as a dry in prior to installing the

    underlayment with this system.

     A. Hot Mop 30/90, Hot Mop 43/90 (see Drawing 1).

    A No. 30 or No. 43anchor/base sheet ASTM D 226, Type II, or ASTM

    D 2626 shall be mechanically attached to the wood deck with

    approved fasteners spaced in a 12-in. grid staggered in two rows in the

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    field, and 6 in. on center at the laps. Extend anchor/base sheet a minimum of 4 in. up vertical surfaces. Anchor/base sheet end laps shall be a minimum of 6 in. and head laps shall be a minimum of 4 in. Over installed anchor/base sheet, apply one layer of mineral surfaced cap sheet ASTM D 249 6380 in full 25 lb./sq, ? l5 percent mopping of

    asphalt. Asphalt shall be applied uniformly so that felts do not touch felts. End laps shall be a minimum of 6 in.; head laps shall be a minimum of 3 in. and backnailed 12 in. on center with approved nails through tincaps or by Miami Dade listed for corrosion resistance

    prefabricated fasteners in accordance with Florida Building Code, Building 1517.5.1 and 1517.5.2.

    DRAWING 1

    TYPICAL 30/90 HOT MAP

     BACKNAILED WITH

    PREFABRICATED FASTENERS OR

    NAILS THROUGH

    TINCAPS 12” O.C.

     NOTE #4: The above system may be upgraded by hot mopping an

    interply of ASTM-listed fiberglass or perforated organic felt to the anchor sheet before applying the cap sheet. Asphalt application shall be per above specifications.

    B. Hot-aApplied Product Approved Underlayment System (see Drawing 1).

    An anchor/base sheet shall be mechanically attached to the wood deck (unless directed otherwise by Product Approval) with approved fasteners spaced in a 12 in. grid staggered in two rows in the field, and 6 in. o.c. on center at the laps or as specified in the underlayment manufacturer‘s Product Approval. Anchor/base sheet end laps shall be

    a minimum of 6 in. and head laps shall be a minimum of 4 in. Over installed anchor/base sheet, apply one layer of cap sheet in a full 25# /sq. ? 15 percent mopping of asphalt. Asphalt shall be applied uniformly so that felts do not touch felts. End laps shall be a minimum of 6 in. o.c. on center; head laps shall be a minimum of 3 in. and

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    backnailed 12 in. o.c. on center with approved nails through tincaps or

    by prefabricated fasteners in accordance with Florida Building Code, Building 1517.5.1 and 1517.5.2.

     C. Cold-aApplied Product Approved Underlayment System (see Drawing 1).

    An anchor/base sheet shall be mechanically attached to the wood deck with approved fasteners spaced in a 12 in. grid staggered in two rows in the field and 6 in. o.c. on center at the laps or as specified in the

    underlayment manufacturer‘s Product Approval. Anchor/base sheet end laps shall be a minimum of 6 in. and head laps shall be a minimum of 4 in. Over anchor/base sheet, apply one layer of cap sheet in a continuous layer of cold process adhesive at the rate of 1.5 gallons per square 100 sq. ft. or at the rate if so stated in the Product Approval. Adhesive shall be applied uniformly in accordance with the Product Approval with a squeegee or knotted brush.so that felts do not touch felts. Cap sheet side laps shall be a minimum of 6 in.; head laps shall be a minimum of 3 in. and backnailed 12 in. o.c. on center with

    approved nails through tincaps or by prefabricated fasteners in accordance with Florida Building Code, Building 1517.5.1 and 1517.5.2.

    D. Product Approved Anchor/Base Sheet/Self-Adhered Underlayment System.

    The roof cover is terminated at approved metal flashings. Any approved anchor/base sheet as listed in the Product Approval shall be mechanically attached to the wood deck with approved fasteners spaced in a 12 in. grid staggered in two rows in the field and 6 in. o.c.

    on center at the laps or as specified in the underlayment

    manufacturer‘s Product Approval. Anchor/base sheet end laps shall be a minimum of 6 in. and head laps shall be a minimum of 4 in. Over anchor/base sheet, apply one layer of any Product Approved, self-adhered underlayment in compliance with the self-adhered underlayment manufacturers‘ approval/ requirements.

     E. Self-aAdhered Underlayment (single ply).

    A single-ply underlayment system utilizing any Product Approved self-adhered underlayment. The roof cover is terminated at approved metal flashings. Apply one layer of any self-adhered underlayment in compliance with the underlayment manufacturers

    approved/requirements. [Mod 2564r]

    Section 3.02 Drip Edge Metal. Change to read as shown.

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