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Steep Slope Roofing Systems.

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Steep Slope Roofing Systems. Based on the 2007 C.B.C. Presented by Oscar Davalos 1507.2.9.2 Valleys. Valley linings shall be installed in accordance with the ... – PowerPoint PPT presentation

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Title: Steep Slope Roofing Systems.


1
Steep Slope Roofing Systems.
  • Based on the 2007 C.B.C.
  • Presented by Oscar Davalos

2
CBC Chapter 15 Noteworthy Changes (Reroofing)
  • 1510.3 Recovering versus replacement. New roof
    coverings shall not be installed without first
    removing all existing layers of roof coverings
    where any of the following conditions occur
  • Where the existing roof or roof covering is
    water soaked or has deteriorated to the point
    that the existing roof or roof covering is not
    adequate as a base for additional roofing.
  • Where the existing roof covering is wood shake,
    slate, clay, cement or asbestos-cement tile.
  • Where the existing roof has two or more
    applications of any type of roof covering.

3
CBC Chapter 15 Noteworthy Changes
  • 1507.2.9.4 Crickets and saddles. A cricket or
    saddle shall be installed on the ridge side of
    any chimney or penetration greater than 30 inches
    (762 mm) wide as measured perpendicular to the
    slope.
  • Cricket or saddle coverings shall be sheet metal
    or of the same material as the roof covering.

4
CBC s. 1507.2.9.4 Remember only if
greater than 30
Greater than 30
5
CBC s. 1507.2.9.4 Remember only if
greater than 30
Greater than 30
6
SECTION 1506 MATERIALS
  • 1506.1 Scope. The requirements set forth in this
    section shall apply to the application of
    roof-covering materials specified herein.
  • Roof coverings shall be applied in accordance
    with this chapter and the manufacturers
    installation instructions.
  • Installation of roof coverings shall comply with
    the applicable provisions of Section 1507.

7
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.

8
104.11 Alternative materials, design and methods
of construction and equipment.
9
104.11 Alternative materials, design and methods
of construction and equipment.
10
1506.4 Product identification.
1506.4 Product identification. Roof-covering
materials shall be delivered in packages bearing
the manufacturers identifying marks and approved
testing agency labels required in accordance with
Section 1505. Bulk shipments of materials shall
be accompanied with the same information issued
in the form of a certificate or on a bill of
lading by the manufacturer.
11
Required Inspections
  • Generally there are two inspection approvals
    required to complete the reroof inspection
    process.
  • Roof Sheathing Inspection and
  • Final Building Inspection.

12
Roof Sheathing Inspection
  • 1503.1 General.
  • Roof decks shall be covered with approved roof
    coverings secured to the building or structure in
    accordance with the provisions of this chapter.
    Roof coverings shall be designed, installed and
    maintained in accordance with this code and the
    approved manufacturers instructions such that
    the roof covering shall serve to protect the
    building or structure.

13
Roof Sheathing Inspection
  • Required Documentation
  • Job Card.
  • Plans (if engineered roofing system)
  • Pertinent documents for proper reference and
    approval's documentation.

14
Roof Sheathing Inspection
  • Roof Access (secured ladder)
  • Damaged sheathing repaired or, replaced.
  • Roof deck clean.
  • All materials on site for verification.
  • Clearances for chimneys, B, BW, and Transite
    vents from combustible surfaces.

15
Transite Vent 11/2 Clearance to combustibles
required.
16
B Vent 1 Clearance to combustibles is required
17
BW vents Require a 1 minimum clearance to
combustible surfaces.
18
Clearances to Chimneys.
  • Factory made chimneys require clearances to
    combustible surfaces in accordance with their
    Listing.
  • Masonry fireplace chimneys require a minimum 2
    clearance to the new repaired or replaced
    sheathing.

19
1507.2 Asphalt shingles.
  • 1507.2 Asphalt shingles. The installation of
    asphalt shingles
  • shall comply with the provisions of this section.
  • 1507.2.1 Deck requirements. Asphalt
    shingles shall be fastened to solidly sheathed
    decks.
  • 1507.2.2 Slope. Asphalt shingles shall only be
    used on roof
  • slopes of two units vertical in 12 units
    horizontal (17-percent
  • slope) or greater. For roof slopes from two units
    vertical
  • in 12 units horizontal (17-percent slope) up to
    four units vertical
  • in 12 units horizontal (33-percent slope), double
  • underlayment application is required in
    accordance with
  • Section 1507.2.8.
  • 1507.2.3 Underlayment. Unless otherwise noted,
    required
  • underlayment shall conform to ASTM D 226, Type I,
  • ASTM D 4869, Type I, or ASTM D 6757.

20
1507.2.8 Underlayment application.
  • 1507.2.8 Underlayment application. For roof
    slopes from two units vertical in 12 units
    horizontal (17-percent slope) and up to four
    units vertical in 12 units horizontal (33-percent
    slope), underlayment shall be two layers applied
    in the following manner. Apply a minimum
    19-inch-wide (483 mm) strip of underlayment felt
    parallel with and starting at the eaves, fastened
    sufficiently to hold in place. Starting at the
    eave, apply 36-inch-wide (914 mm) sheets of
    underlayment overlapping successive sheets 19
    inches (483 mm), by fastened sufficiently to hold
    in place. Distortions in the underlayment shall
    not interfere with the ability of the shingles to
    seal.
  • For roof slopes of four units vertical in 12
    units horizontal (33-percent slope) or greater,
    underlayment shall be one layer applied in the
    following manner.
  • Underlayment shall be applied shingle fashion,
    parallel to and starting from the eave and lapped
    2 inches (51 mm), fastened sufficiently to hold
    in place. Distortions in the underlayment shall
    not interfere with the ability of the shingles to
    seal.

21
Double underlayment requirement for slopes from
212 to 412
22
1507.2.9 Flashings.
  • 1507.2.9 Flashings. Flashing for asphalt shingles
    shall comply with this section. Flashing shall be
    applied in accordance with this section and the
    asphalt shingle manufacturers printed
    instructions.

23
Flashings.
  • 1507.2.9.3 Drip edge. Provide drip edge at eaves
    and gables of shingle roofs. Overlap to be a
    minimum of 2 inches (51 mm). Eave drip edges
    shall extend 0.25 inch (6.4 mm) below sheathing
    and extend back on the roof a minimum of 2 inches
    (51 mm). Drip edge shall be mechanically fastened
    a maximum of 12 inches (305 mm) o.c.

24
1507.2.9.3 Drip edge
Rake metal over the felt.
Eave metal under the felt.
25
1507.2.9 Flashings.
26
1507.2.9 Flashings.
27
Roof to wall flashing.
28
1507.2.9 Flashings.
  • 5 steps to make skylights watertight.

29
1507.2.9 Flashings.
30
1507.2.9 Flashings.
31
Skylights
  • Keep in mind that if skylights are to be added to
    your home, they must be noted on the permit and a
    framing inspection is required.

32
1507.2.9.2 Valleys.
?
33
1507.2.9.2 Valleys.
34
1507.2.9.2 Valleys.
  • Valley linings shall be installed in accordance
    with the manufacturers instructions before
    applying shingles. Valley linings of the
    following types shall be permitted
  • For open valleys (valley lining exposed) lined
    with metal, the valley lining shall be at least
    16 inches wide and of corrosion resistant metals
    in table 1507.2.9.2.
  • For open valleys, valley lining of two plies
    mineral- surfaced roll roofing complying with
    ASTM D 3909 or ASTM D 6380 shall be permitted.
    The bottom layer shall be 18 inches and the top
    layer a minimum of 36 inches wide.

35
1507.2.9.2 Valleys.
  • For closed valleys (valleys covered with
    shingles), valley lining of one ply of smooth
    roll roofing complying with ASTM D 6380, class S
    type III class M type II or ASTM D 3909 and at
    least 36 wide or types as described in items 1
    and 2 shall be permitted. Specialty underlayment
    shall comply with ASTM D 1970.

36
1507.2.9.2 Valleys.
37
1507.2.9 Flashings.
38
1507.2.6 Fasteners.
  • 1507.2.6 Fasteners. Fasteners for asphalt
    shingles shall be galvanized, stainless steel,
    aluminum or copper roofing nails, minimum 12 gage
    0.105 inch (2.67 mm) shank with a minimum
    0.375 inch-diameter (9.5 mm) head, of a length to
    penetrate through the roofing materials and a
    minimum of 0.75 inch (19.1 mm) into the roof
    sheathing. Where the roof sheathing is less than
    0.75 inch (19.1 mm) thick, the nails shall
    penetrate through the sheathing. Fasteners shall
    comply
  • With ASTM F 1667.

39
1507.2.6 Fasteners.
40
1507.2.6 Fasteners.
41
1507.2.7 Attachment.
  • 1507.2.7 Attachment. Asphalt shingles shall have
    the minimum number of fasteners required by the
    manufacturer and Section 1504.1. Asphalt shingles
    shall be secured to the roof with not less than
    four fasteners per strip shingle or two fasteners
    per individual shingle.
  • Where the roof slope exceeds 20 units vertical in
    12 units horizontal (166-percent slope), asphalt
    shingles shall be installed in accordance with
    the manufacturers printed installation
    instructions for steep-slope roof applications.

42
1507.2.7 Attachment.
43
Ventilation.
44
Ventilation.
  • 1203.2 Attic spaces. Enclosed attics and enclosed
    rafter spaces formed where ceilings are applied
    directly to the underside of roof framing members
    shall have cross ventilation for each separate
    space by ventilating openings protected against
    the entrance of rain and snow.
  • Blocking and bridging shall be arranged so as
    not to interfere with the movement of air.
    minimum of 1 inch (25 mm) of airspace shall be
    provided between the insulation and the roof
    sheathing.

45
Ventilation.
  • The net free ventilating area shall not be less
    than 1/150 of the area of the space ventilated,
    with 50 percent of the required ventilating area
    portion of the space to be ventilated at least 3
    feet (914 mm) above eave or cornice vents
    provided by ventilators located in the upper
    portion of the space to be ventilated at least 3
    feet (914 mm) above eave or cornice vents with
    the balance of the required ventilation provided
    by eave or cornice vents.

46
Ventilation.
  • Exception The minimum required net free
    ventilating area shall be 1/300 of the area of
    the space ventilated, provided a vapor retarder
    having a transmission rate not exceeding 1perm in
    accordance with ASTM E 96 is installed on the
    warm side of the attic insulation and provided 50
    percent of the required ventilating area provided
    by ventilators located in the upper portion of
    the space to be ventilated at least 3 feet (914
    mm) above eave or cornice vents, with the balance
    of the required ventilation provided by eave or
    cornice vents.

47
Final Inspection Requirements.
  • Safe roof access.
  • All work completed in accordance to the
    requirements of the 2007 C.B.C. and the materials
    manufacturers installation instructions.
  • Damaged or missing vent caps replaced.
  • All work related debris removed from site.
  • Required Documentation available to Inspector

48
Questions?
  • City of Anaheim Building Division Office
  • 1st Floor of City Hall East
  • 200 S. Anaheim Blvd., Anaheim, CA
    92805 www.anaheim.net/building
  • (714) 765-5153
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