(Draft) Asphalt Shingle Systems Standard - Revision history

James Klassen: /* 2.1.1.2. {{strike| Definitions || 2025-February-1 }}{{hilite | Defined Terms || 2026-February-1 }} */

2026-06-24T21:10:57Z

‎2.1.1.2. {{strike| Definitions || 2025-February-1 }}{{hilite | Defined Terms || 2026-February-1 }}

James Klassen at 15:12, 22 June 2026

2026-06-22T15:12:05Z

James Klassen: /* 1.1.1.4. {{strike| Definitions || 2025-February-1 }}{{hilite | Defined Terms || 2026-February-1 }} */

2026-06-22T14:38:26Z

‎1.1.1.4. {{strike| Definitions || 2025-February-1 }}{{hilite | Defined Terms || 2026-February-1 }}

James Klassen: /* 10.3.5.5. Woven Valleys */

2026-03-27T16:45:34Z

‎10.3.5.5. Woven Valleys

James Klassen: /* 9.1.1.2. {{strike| Definitions || 2025-February-1 }}{{hilite | Defined Terms || 2026-February-1 }} */

2026-03-27T16:44:07Z

‎9.1.1.2. {{strike| Definitions || 2025-February-1 }}{{hilite | Defined Terms || 2026-February-1 }}

James Klassen: /* 10.3.5.6. Closed (Cut) Valleys */

2026-03-27T16:42:35Z

‎10.3.5.6. Closed (Cut) Valleys

James Klassen: /* 10.3.5.4. California Valleys */

2026-03-27T16:41:34Z

‎10.3.5.4. California Valleys

James Klassen: /* 10.3.5.3. Open Valleys */

2026-03-27T16:39:55Z

‎10.3.5.3. Open Valleys

James Klassen: /* 9.3.2.4. {{hilite | Shingle Nailing || 2027-February-1 }}{{strike| General Requirements for Asphalt Shingle Application || 2026-January-31 }} */

2026-03-26T22:25:30Z

‎9.3.2.4. {{hilite | Shingle Nailing || 2027-February-1 }}{{strike| General Requirements for Asphalt Shingle Application || 2026-January-31 }}

James Klassen at 18:19, 30 January 2026

2026-01-30T18:19:57Z

@@ Line 501: / Line 501: @@
 <li>Words that appear in italics are defined in the [[Glossary | Glossary]].  Additionally, the following terms are used in this Part:
 <ol>
-<li>''Common Slope'' means a roof with a slope 1:3 (4” in 12”, or 18 degrees), up to and including 1:1 (12” in 12”, or 45 degrees).
+<li>''Common Slope'' means a slope 1:3 (4” in 12”, or 18 degrees), up to and including 1:1 (12” in 12”, or 45 degrees).
 <li>{{hilite | ''Deck overlay''|| 2021-June-30 }} {{hilite | means a panel material secured to the ''supporting deck'', to render the deck surface suitable for the installation of roofing materials|| 2021-June-30 }}.
-<li>''Extreme Slope'' means a roof with a slope <u>greater than</u> 21:12 (21” in 12”, or 84 degrees).
+<li>''Extreme Slope'' means a slope <u>greater than</u> 21:12 (21” in 12”, or 84 degrees).
-<li>''Flat'' (roof) means a roof with a slope less than 1:6 (2” in 12”, or 9 degrees).
+<li>''Flat'' means a slope less than 1:6 (2” in 12”, or 9 degrees).
 <li>''Low Slope'' means a roof with a slope 1:6 (2" in 12", or 9 degrees, up to but less than 1:3 (4” in 12”, or 18 degrees).
 <li>{{hilite | ''Sheathing'' means a rigid panel material secured directly onto framing. || 2024-January-31 }}
-<li>''Steep Slope'' means a roof with a slope <u>greater than</u> 1:1 (12” in 12”, or 45 degrees) up to and including 21:12 (21” in 12”, or 84 degrees).
+<li>''Steep Slope'' means a slope <u>greater than</u> 1:1 (12” in 12”, or 45 degrees) up to and including 21:12 (21” in 12”, or 84 degrees).
 <li>{{hilite | ''Supporting deck'' ("deck")|| 2021-June-30 }} {{hilite | means the "structural surface to which a ''roof system'' is applied" (adapted from ''ASTM D1079-18 Standard Terminology Relating to Roofing and Waterproofing'')|| 2021-June-30 }}.
 <li>{{hilite | ''Wall''|| 2021-June-30 }} {{hilite | means a structural or non-structural element in a building that vertically separates space.  ''Walls'' may separate the outside environment from the interior conditioned space of a building, or they may separate one or more interior spaces from each other (adapted from ASTM E631-15, "Standard Terminology of Building Constructions")|| 2021-June-30 }}.

@@ Line 666: / Line 666: @@
 <li>{{hilite | Wood or steel-stud ''walls'' must be sheathed with a material suitable for adhering membranes and securing metal flashings|| 2021-June-30 }}; {{hilite | when sheathing is unsuitable, it must be overlaid with an accepted wall overlay. || 2024-January-31 }}
 <li>{{hilite | ''Sheathing''{{strike| , defined as a rigid panel material secured directly onto framing, || 2023-January-26 }} is considered a wall surface for the purpose of this Standard|| 2021-June-18 }}.
-<li>{{hilite | ''Wall'' surfaces {{hilite | suitable for || 2024-January-31 }} receiving ''waterproofing'' materials must extend beyond the maximum installed height of the ''waterproofing'', but in any event must be installed at least 203.2 mm (8”) above the|| 2021-June-18 }} ''finished roof system surface'' {{hilite | (For ''wall'' overlays, refer to [[#5.2.1.3. Overlays for Walls | Article 5.2.1.3.]])|| 2021-June-18 }}.
+<li>{{hilite | ''Wall'' surfaces {{hilite | suitable for || 2024-January-31 }} receiving ''waterproofing'' materials must extend beyond the maximum installed height of the ''waterproofing'', but in any event must be installed at least 203.2 mm (8”) above the|| 2021-June-18 }} ''finished system surface'' {{hilite | (For ''wall'' overlays, refer to [[#5.2.1.3. Overlays for Walls | Article 5.2.1.3.]])|| 2021-June-18 }}.
 </li></ol>
@@ Line 1,512: / Line 1,512: @@
 <li>{{hilite | overhang the fascia by at least 25.4 mm (1”), || 2023-June-22 }}
 <li>{{hilite | extend up the slope at least 914.4 mm (36"), or to a line not less than 304.8 mm (12") inside the inner face of the exterior wall || 2023-June-22 }}  (<span class="recommended">609.6 mm (24") in regions with heavy snow</span>; see {{hilite | '''Figure 8.3.2.1.-A''' || 2026-February-1 }}), and
-<li>{{hilite | extend up all abutments (walls, skylights, etc.) at least 152.4 mm (6″) above the surface of the ''finished roof system surface''. || 2023-June-22 }}
+<li>{{hilite | extend up all abutments (walls, skylights, etc.) at least 152.4 mm (6″) above the surface of the ''finished system surface''. || 2023-June-22 }}
 </li></ol>
 <li>{{hilite | Horizontal runs of ''eave protection'' must be positively lapped at least 50.8 mm (2″) and end laps (vertical joints) must be at least 152.4 mm (6″). || 2023-June-22 }}
@@ Line 2,222: / Line 2,222: @@
 </li></ol>
 <li>Fascia flashing, when specified as part of the roofing work, must be fastened on the vertical face no more than 609.6 mm (24”) O.C. in a staggered pattern, and fasteners shall be placed at least 25.4 mm (1”) from top edge of the fascia.
-<li>When the fascia board extends above the surface of the ''finished roof system surface'',
+<li>When the fascia board extends above the surface of the ''finished system surface'',
 <ol>
 <li>{{hilite | the fascia board must be covered on the top and inside faces with eave protection membrane (to separate metal from wood), || 2023-June-16 }}
@@ Line 2,473: / Line 2,473: @@
 <li>''underlayment'' must overlap the ''waterproofing roof system '' sheet membrane flashing by no less than 101.6 mm (4”),
 <li>shingles must overlap the ''waterproofing roof system '' sheet membrane flashing by at least 152.4 mm (6”), and shall be started with a ''starter course'',
-<li>the bottom edge of the lowest course of shingles must be no closer to the ''finished roof system surface'' of the ''waterproofing roof system '' than 101.6 mm (4”), and
+<li>the bottom edge of the lowest course of shingles must be no closer to the ''finished system surface'' of the ''waterproofing roof system '' than 101.6 mm (4”), and
-<li>fasteners for the ''water-shedding roof system'' must be at least 203.2 mm (8”) above the ''finished roof system surface'' of the ''waterproofing roof system '' (when measured vertically), or 304.8 mm (12”) for regions with heavy snow.
+<li>fasteners for the ''water-shedding roof system'' must be at least 203.2 mm (8”) above the ''finished system surface'' of the ''waterproofing roof system '' (when measured vertically), or 304.8 mm (12”) for regions with heavy snow.
 </li></ol>
 </li></ol>
@@ Line 2,560: / Line 2,560: @@
 <li><span class="recommended">''primary'' and ''overflow drain'' capacities</span>,
 <li><span class="recommended">hydraulic head (pressure)</span>, and
-<li><span class="recommended">{{hilite | the location of the ''drainage plane''|| 2021-October-30 }}</span> {{hilite | (the ''drainage plane'' is not necessarily the same as the|| 2021-October-30 }} ''finished roof system surface'', {{hilite | and the location of the ''drainage plane'' may affect the determination of live loads, which should be accounted for as part of drainage design|| 2021-October-30 }}).
+<li><span class="recommended">{{hilite | the location of the ''drainage plane''|| 2021-October-30 }}</span> {{hilite | (the ''drainage plane'' is not necessarily the same as the|| 2021-October-30 }} ''finished system surface'', {{hilite | and the location of the ''drainage plane'' may affect the determination of live loads, which should be accounted for as part of drainage design|| 2021-October-30 }}).
 </li></ol>
 <li>Roofs may drain off a roof edge, or by means of internal plumbing (both are permissible under the '''''RoofStar Guarantee Program''''').
@@ Line 3,102: / Line 3,102: @@
 <ol>
 <li>All penetration flashing materials must be new.
-<li>All penetrations must be flashed to seal the penetration where it passes through the deck and underlayment, and must prevent water ingress at least 203.2 mm (8") above the ''finished roof system surface''.
+<li>All penetrations must be flashed to seal the penetration where it passes through the deck and underlayment, and must prevent water ingress at least 203.2 mm (8") above the ''finished system surface''.
 <li>{{hilite | Each roof penetration must have its own flashing (except where a purpose-made flashing is designed for multiple penetrations), and each flashing|| 2021-June-30 }}
 <ol>
@@ Line 3,226: / Line 3,226: @@
 <li>All ''curbs''
 <ol>
-<li>must be no less than 152.4 mm (6”) in height, when measured from the ''finished roof system surface'',
+<li>must be no less than 152.4 mm (6”) in height, when measured from the ''finished system surface'',
 <li>shall be fully flashed with a self-adhered underlayment membrane, and
 <li>must be flashed on all sides with
@@ Line 3,800: / Line 3,800: @@
 <li>shall be spaced no more than 304.8 mm (12”) O.C.,
 <li>must penetrate the substrate as specified in [[#9.3.2.4. Shingle Nailing | Article 9.3.2.4.]], and
-<li>must be installed at least 88.9 mm (3-1/2") above the ''finished roof system surface''.
+<li>must be installed at least 88.9 mm (3-1/2") above the ''finished system surface''.
 </li></ol>
 <li>Where an adjoining ''waterproofing roof system'' is specified as part of the ''Contractor's'' scope of work, the work shall conform to the installation and seam requirements in the applicable ''waterproofing roof system'' Standard.
@@ Line 3,915: / Line 3,915: @@
 <li>must not penetrate the metal ''roof system'',
 <li>shall be deck-mounted,
-<li>must be mounted at least 152.4 mm (6 inches) above the ''finished roof system surface'', and
+<li>must be mounted at least 152.4 mm (6 inches) above the ''finished system surface'', and
 <li>shall be designed in consultation with a ''registered professional'' skilled in the work concerned ("British Columbia Building Code", Division C, [https://free.bcpublications.ca/civix/document/id/public/bcbc2018/bcbc_2018dcp2s22r2 Section 2.2., "Administration"]).
 </li></ol>

@@ Line 122: / Line 122: @@
 <ol>
 <li>''Design Authority'' means the individual or firm responsible for the issuance of ''project'' specifications and details to which the ''project'' will be bid and constructed.  When a ''Contractor'' designs a ''project'', the ''Contractor'' is deemed to be the ''Design Authority''.
-<li>{{hilite |''Finished roof system surface''|| 2020-February-3 }} {{hilite | means the top surface of any ''roof system'', inclusive of ballast or ''overburden''|| 2021-February-7 }}.
+<li>{{hilite | ''Finished system surface'' means the top surface of any waterproofing or water-shedding system, inclusive of ballast or ''overburden''|| 2027-June-11 }}.
 <li>''Grade-level waterproofing system'' means an insulated or uninsulated ''system'', designed and constructed at grade with a sheet or liquid-applied membrane, to exclude water.
-<li>{{hilite | ''Linear metal flashing''|| 2021-June-30 }} {{hilite | means flashings cut and shaped from flat metal stock, to redirect water at roof perimeters and edges, or to control the flow of water in valleys and drainage spillways.  ''Linear metal flashings'' also protect roof membranes from weathering and damage and provide an aesthetic finish to the ''roof system''|| 2021-June-30 }}.
+<li>{{hilite | ''Guarantor'' (used interchangeably with '''''RGC''''') means the RCABC Guarantee Corporation, which offers the '''''RoofStar Guarantee'''''. || 2023-June-16 }}
-<li>{{hilite | ''Guarantor'' (used interchangeably with ''RGC'') means the RCABC Guarantee Corporation, which offers the '''''RoofStar Guarantee'''''. || 2023-June-16 }}
+<li>{{hilite | ''Linear metal flashing'' means flashings cut and shaped from flat metal stock, to redirect water at roof perimeters and edges, or to control the flow of water in valleys and drainage spillways.  ''Linear metal flashings'' also protect roof membranes from weathering and damage and provide an aesthetic finish to the ''waterproofing system''  or ''water-shedding system''|| 2027-June-11 }}.
 <li>{{hilite | ''Membrane system'' means the combination of field and flashing membranes which function together to waterproof underlying materials and ''systems''. || 2023-June-16 }}
-<li>{{hilite | ''Observer'' means a firm or person paid by the building Owner (directly, or through the '''''RGC'''''), who is independent (not a member) of the RCABC, and who is accepted by the '''''RGC''''' to provide Quality Assurance reviews during construction and after completion of the ''project'', according to the terms and conditions set out in RCABC policy || 2026-February-1 }}.
+<li>{{hilite | ''Observer'' means a firm or person paid by the building Owner (directly, or through the '''''RGC'''''), who is independent (not a member) of the RCABC, and who is accepted by the '''''RGC''''' to provide Quality Assurance reviews during construction and after completion of the ''project'', according to the terms and conditions set out in RCABC policy || 2025-October-25 }}.
-<li>''Waterproofing roof system'' means an insulated or uninsulated ''roof system'', designed and constructed on roofs using a sheet or liquid-applied membrane, to exclude water.  This type of ''system'' typically is installed on roof slopes less than 1:4 (3” in 12”).
+<li>{{hilite | ''Waterproofing system'' means a sealed, functional arrangement of ''primary materials'' constructed on roofs, plaza ''decks'', or on grade-level slabs (with or without insulation and other related materials), to resist the transmission of liquid water through the system, including water under hydrostatic pressure|| 2027-June-11 }}.
 <li>''Water-shedding roof system'' means an insulated or uninsulated ''roof system'', designed and constructed to shed water away from a structure, not to waterproof it.  This type of ''system'' typically is installed on roof slopes greater than 1:4 (3” in 12”) but may be installed on slopes as low as 1:6 (2" in 12").
 </li></ol>

@@ Line 2,357: / Line 2,357: @@
 <ol>
-<li>Woven valleys must be constructed only with single-layer three-tab shingles and are not acceptable for laminated shingles.
+<li>Woven valleys must be constructed only with single-layer ''three-tab asphalt shingles'' and are not acceptable for ''laminated asphalt shingles''.
 <li>Shingles must be installed in alternating courses, first on one side of the valley and then on the other, repeating this pattern so that the shingle from each course that lies across the valley overlaps the other, creating a "woven" pattern.
 <li>Shingles that extend across the valley

@@ Line 1,610: / Line 1,610: @@
 <li>Words that appear in italics are defined in the [[Glossary | Glossary]].  Additionally, the following terms are used in this Part:
 <ol>
-<li>{{hilite | ''Designer shingle'' means an asphalt shingle as described in Subsection 3.6 of the RGC Acceptance Criteria RGC ACWS-ASH || 2027-February-1  }}.
+<li>{{hilite | ''Designer asphalt shingle'' means an asphalt shingle as described in Subsection 3.6 of the RGC Acceptance Criteria RGC ACWS-ASH || 2027-February-1  }}.
-<li>{{hilite | ''Laminated shingle'' means an asphalt shingle as described in Subsection 3.6 of the RGC Acceptance Criteria RGC ACWS-ASH || 2027-February-1  }}.
+<li>{{hilite | ''Laminated asphalt shingle'' means an asphalt shingle as described in Subsection 3.6 of the RGC Acceptance Criteria RGC ACWS-ASH || 2027-February-1  }}.
-<li>{{hilite | ''Three-tab shingle'' means an asphalt shingle as described in Subsection 3.6 of the RGC Acceptance Criteria RGC ACWS-ASH || 2027-February-1  }}.
+<li>{{hilite | ''Three-tab asphalt shingle'' means an asphalt shingle as described in Subsection 3.6 of the RGC Acceptance Criteria RGC ACWS-ASH || 2027-February-1  }}.
 <li>''Manufacturer'' means the manufacturer of the primary roof covering, unless stated otherwise.
 <li>{{hilite | Overlap sealant strip means a heat-activated self-adhesive material applied to one or both faces of an asphalt shingle, which bonds successive courses of shingles together to resist lifting || 2027-February-1  }}.

@@ Line 2,374: / Line 2,374: @@
 <ol>
 <li>Closed-cut valley may be used only on roof slopes exceeding 1:3 (4" in 12"), and only if permitted in writing by the ''manufacturer''.
-<li>Closed-cut valleys shall not be used with laminated asphalt shingles.
+<li>Closed-cut valleys shall not be used with ''laminated asphalt shingles''.
 <li>Shingles must be pressed tightly into the valley.
 <li>No nails may be fastened within 152.4 mm (6”) of the valley center-line.

@@ Line 2,337: / Line 2,337: @@
 <ol>
-<li>"California" valleys (a variation on open valleys) are permissible for laminated shingles, subject to approval by the ''manufacturer'', and must be constructed in keeping with the requirements in this Article, or the ''manufacturer’s'' published installation requirements, whichever are greater.
+<li>"California" valleys (a variation on open valleys) are permissible for ''laminated asphalt shingles'', subject to approval by the ''manufacturer'', and must be constructed in keeping with the requirements in this Article, or the ''manufacturer’s'' published installation requirements, whichever are greater.
-<li>Laminated shingles used as a valley ''starter'' must be
+<li>''Laminated asphalt shingles'' used as a valley ''starter'' must be
 <ol>
 <li>laid end to end vertically up each side of the installed metal valley flashing, so that their bottom edges align with and are set back from the centre of the valley by at least 50.8 mm (2”) (use a chalk lines for guidance), and
 <li>nailed through the ''common bond'' using at least four (4) fasteners per shingle (Ref. [[#9.3.2.4. Shingle Nailing | Article 9.3.2.4.]]).
 </li></ol>
-<li>Laminated field shingles (uncut) must be
+<li>''Laminated asphalt shingles'' installed in the field (uncut) must be
 <ol>
 <li>laid perpendicular to the roof slope and overlap the valley ''starter'' shingles installed on either side of the valley centre line,

@@ Line 2,318: / Line 2,318: @@
 <ol>
 <li>lock-type shingles,
-<li>laminated asphalt shingles, and
+<li>''laminated asphalt shingles'',
 <li>all shingle applications on a ''low slope'' roof.
 </li></ol>

@@ Line 1,835: / Line 1,835: @@
 <li>{{hilite | ''Designer asphalt shingles'' installed|| 2027-February-1 }}
 <ol>
-<li>{{hilite | on ''low slopes'' and ''steep slopes'' shall be nailed in the ''manufacturer's'' designated fastening zone (line) with at least five (5) nails, as shown in the ''manufacturer's'' published instructions, and|| 2027-February-1 }}
+<li>{{hilite | on ''low slopes'' and ''common slopes'' shall be nailed in the ''manufacturer's'' designated fastening zone (line) with at least five (5) nails, as shown in the ''manufacturer's'' published instructions, and|| 2027-February-1 }}
 <li>{{hilite | on steep slopes shall be nailed with at least nine (9) nails conforming to the ''manufacturer's'' published pattern and shall, when required by the ''manufacturer'', must be additionally secured with spots of roofing cement (Type II) conforming to the requirements in [[#9.2.1.6. Roofing Cement | Article 9.2.1.6.]]; each spot of cement shall be applied to the underside of the shingle where required by the ''manufacturer'' and must measure between 22.23 mm (7/8") and  25.4 mm (1") in diameter|| 2027-February-1 }}.
 </li></ol>

@@ Line 3,928: / Line 3,928: @@
 <div class="col-md-12">
-[[Main Page | <i class="fa fa-home fa"></i> Home]]
+[[RCABC Roofing Practices Manual | <i class="fa fa-home fa"></i> Home]]
 </div>
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