PVC Roof Systems Standard - Revision history

James Klassen: /* 11.2.1.3. Membrane Gutters and Gutter Liners */

2026-04-20T14:51:24Z

‎11.2.1.3. Membrane Gutters and Gutter Liners

James Klassen: /* 11.2.1.3. Membrane Gutters and Gutter Liners= */

2026-04-20T14:49:28Z

‎11.2.1.3. Membrane Gutters and Gutter Liners=

James Klassen: /* 3.1.3.2. Calculation of Specified Wind Loads */

2026-04-10T21:01:55Z

‎3.1.3.2. Calculation of Specified Wind Loads

James Klassen: /* 3.1.3.2. Calculation of Specified Wind Loads */

2026-03-31T16:37:36Z

‎3.1.3.2. Calculation of Specified Wind Loads

James Klassen: /* 9.3.2.1. Preparation of Substrate */

2026-03-27T16:32:10Z

‎9.3.2.1. Preparation of Substrate

James Klassen: /* 1.1.3.3. Membrane Integrity Testing */

2026-03-19T18:48:35Z

‎1.1.3.3. Membrane Integrity Testing

James Klassen: /* 13.3.2. All Systems */

2026-02-13T18:01:40Z

‎13.3.2. All Systems

James Klassen at 18:22, 30 January 2026

2026-01-30T18:22:11Z

James Klassen: /* 1.1.4.4. Membrane Recovering */

2026-01-19T22:02:36Z

‎1.1.4.4. Membrane Recovering

James Klassen at 22:10, 31 October 2025

2025-10-31T22:10:29Z

Show changes

@@ Line 4,415: / Line 4,415: @@
 </li></ol>
-===11.2.1.3. Membrane Gutters and Gutter Liners===
+====11.2.1.3. Membrane Gutters and Gutter Liners====
 <ol>

@@ Line 4,415: / Line 4,415: @@
 </li></ol>
-===11.2.1.3. Membrane Gutters and Gutter Liners====
+===11.2.1.3. Membrane Gutters and Gutter Liners===
 <ol>

@@ Line 1,027: / Line 1,027: @@
 <li>A ''registered professional'' "skilled in the work concerned" must perform or validate the calculation of ''Specified Wind Loads'' (See the "British Columbia Building Code 2024", Division C, Part 2, [https://www2.gov.bc.ca/assets/gov/farming-natural-resources-and-industry/construction-industry/building-codes-and-standards/revisions-and-mo/bcbc_2024.pdf#page=836 Article 2.2.1.2., "Structural Design"]), using
 <ol>
-<li>the [https://nrc.canada.ca/en/research-development/products-services/software-applications/wind-load-calculators-roof-cladding-vegetated-roof-assembly "Wind Uplift Resistance Calculator"] (formerly "Wind-RCI"), or
+<li>the [https://nrc.canada.ca/en/research-development/products-services/software-applications/wind-roof-calculators-internet-wind-rci Wind-Roof Calculators on the Internet (Wind-RCI)], or
 <li>the formulae and procedures in the "British Columbia Building Code 2024", Division B, Part 4, [https://www2.gov.bc.ca/assets/gov/farming-natural-resources-and-industry/construction-industry/building-codes-and-standards/revisions-and-mo/bcbc_2024.pdf#page=529 Subsection 4.1.7.,"Wind Load"] (See [[Notes to PVC Standard#A-3.1.1.1. | Note A-3.1.1.1.]]).
 </li></ol>

@@ Line 1,069: / Line 1,069: @@
 <li>Mansards are a ''roof system'' and are therefore subject to the requirements in this Part.
 <li>Securement of an adjoining ''water-shedding system'' shall be made in accordance with the requirements in the applicable Standard.
-<li>{{hilite | Wind loads for a ''roof assembly'' supporting a ''vegetated roof system'' shall be determined in accordance with the requirements of the Building Code and || 2025-October-25 }} [https://rpm.rcabc.org/index.php?title=VRA_Standard#3.1.3.3. Resistance to Specified Wind Loads | Article 3.1.3.3.]] {{hilite | of the “RGC Standard for Vegetated Roofs”|| 2025-October-25 }}.
+<li>{{hilite | Wind loads for a ''roof assembly'' supporting a ''vegetated roof system'' shall be determined in accordance with the requirements of the Building Code and || 2025-October-25 }} [https://rpm.rcabc.org/index.php?title=VRA_Standard#3.1.3.3._Resistance_to_Specified_Wind_Loads Article 3.1.3.3.] {{hilite | of the “RGC Standard for Vegetated Roofs”|| 2025-October-25 }}.
 {{strike| <li>''Vegetated Roof Systems'' specified for || 2024-October-24 }}
 <ol>

@@ Line 3,149: / Line 3,149: @@
 <li>capable of accommodating ''roof system'' component movement,
 <li>clean,
-<li>adequately dry and frost-free {{hilite | (Ref. || 2023-October-28 }} [[PVC_Roof_Systems_Standard#2.1.5._Roof_Decks | {{hilite | Subsection 2.1.5., "Roof Decks" || 2023-October-28 }}]]),
+<li>adequately dry and frost-free {{hilite | (Ref. || 2023-October-28 }} [[SBS_Roof_Systems_Standard#2.1.5._Roof_Decks | {{hilite | Subsection 2.1.5., "Roof Decks" || 2023-October-28 }}]]),
 <li>reasonably smooth and free of abrupt elevation changes, and
 <li>absolutely free of
@@ Line 3,167: / Line 3,167: @@
 <li>{{hilite | A properly secured, accepted overlay board is required || 2023-June-16 }} (Ref. [[#Part 5 - Deck and Wall Overlays | Part 5]])
 <ol>
-<li>{{hilite | for any ''deck'' that does not meet the deck fastening criteria set out in || 2023-June-16 }} [[#2.1.5.3. All Wood Roof Decks | Article 2.1.5.3.]],
+<li>{{hilite | for any ''deck'' that does not meet the deck fastening criteria set out in || 2023-June-16 }} [[#2.1.5.3. All Wood Roof Decks | Article 2.1.5.3.]], and
-<li>{{hilite | for any ''deck'' that cannot be repaired or otherwise made suitable for roofing, || 2023-June-16 }} and
+<li>{{hilite | for any ''deck'' that cannot be repaired or otherwise made suitable for roofing. || 2023-June-16 }}
 </li></ol>
 <li>{{hilite | Substrates must be primed, if required by the ''manufacturer''. || 2023-June-16 }}
@@ Line 3,186: / Line 3,185: @@
 <li>mechanically fastened or loose-laid membranes.
 </li></ol>
 <li>If surface drying is required prior to roofing, the ''deck'' must be dried with blown air.
 </li></ol>

@@ Line 293: / Line 293: @@
 <li>''overburden'', amenities, or equipment exceed 152.4 mm (6”) in depth{{strike| (see Figure 1.1.3-A) || 2024-October-24 }}.
 </li></ol>
-<li>{{hilite | When the ''roof assembly'' supports a ''vegetated roof system'' covered by a '''''RoofStar Guarantee''''' an electrical current membrane integrity test is optional (not required)  || 2025-October-25 }}<span class="recommended">{{hilite | but recommended || 2025-October-25 }}</span>.{{hilite | An electrical current membrane integrity test is required immediately prior to the installation of a ''vegetated roof system'' || 2025-October-25 }}.
+<li>{{hilite | When the ''roof assembly'' supports a ''vegetated roof system'' covered by a '''''RoofStar Guarantee''''',|| 2025-October-25 }} <span class="recommended">{{hilite | an electrical current membrane integrity test is recommended but is not required|| 2025-October-25 }}</span>; {{hilite | however, when an integrity test is specified by the ''Design Authority'', it must be carried out immediately prior to the installation of a ''vegetated roof system'' || 2025-October-25 }}.
 <li>An electrical current membrane integrity test must be performed by an RGC-recognized service provider {{hilite | listed in [[Division_C | Division C]]|| 2021-October-30 }}.
 <li>Flood testing employed as a secondary or alternative membrane integrity test <span class="recommended">is strongly discouraged for ''conventionally insulated roof systems'' because of the risk of extensive damage to ''system'' components or the building interior</span>, and is best suited for ''protected roof systems'' (See [[Notes to PVC Standard#A-1.1.3.3.(5) | Note A-1.1.3.3.(5)]]).

@@ Line 5,718: / Line 5,718: @@
 <li>is copper and zinc, and the material thickness or weight exceeds the weight or gauge requirements in [[#13.2.1.2. Sheet Metal Grade and Gauge | Article 13.2.1.2.]]
 </li></ol>
-<li>{{hilite | '''Straight (linear) joints''' between lengths of ''linear metal flashing'' must be fully seamed using only an S-lock ({{hilite | '''Figure 13.3.2.2.-A'''|| 2025-October-25 }}) or Standing Seam ({{hilite | '''Figure 13.3.2.2.-B'''|| 2025-October-25 }}), but this requirement does not apply to|| 2021-October-30 }}
+<li>{{hilite | '''Straight (linear) joints''' between lengths of ''linear metal flashing'' must be fully seamed using only a Standing Seam ({{hilite | '''Figure 13.3.2.2.-A'''|| 2025-October-25 }}) or S-lock ({{hilite | '''Figures 13.3.2.2.-B''' and '''C'''|| 2025-October-25 }}), but this requirement does not apply to|| 2021-October-30 }}
 <ol>
 <li>{{hilite | flashing fashioned from 22-gauge metal (or heavier)|| 2021-October-30 }}, or
@@ Line 5,763: / Line 5,763: @@
 <br>
-::{|
+{|
 |-
-| colspan="1"; style="text-align:center;width:450px;" | {{hilite | '''{{hilite | Figure 13.3.2.2.-A || 2026-October-31 }} Standing Seam'''<br>Forming Part of Sentence 13.3.2.2.(5)<br><small>(Click to expand illustration)</small> || 2025-October-25 }}
+| colspan="1"; style="text-align:center;width:600px;" | {{hilite | '''{{hilite | Figure 13.3.2.2.-A || 2026-October-31 }} Standing Seam'''<br>Forming Part of Sentence 13.3.2.2.(5)<br><small>(Click to expand illustration)</small> || 2025-October-25 }}
 |-
 | [[File:MF - Standing Seam.png | link=https://rpm.rcabc.org/images/a/a3/MF_-_Standing_Seam.png | 500 px]]
 |}
+<br>
-<li>'''S-locked seams''' {{hilite | (See '''Figure 13.3.2.2.-B''')|| 2026-October-31 }} must be secured through flashing tab (leaf) with at least one (1) acceptable low-profile flat head screw when the seam is longer than 101.6 mm (4”), but fasteners must not be spaced more than 203.2 mm (8”) O.C.
+<li>'''S-locked seams''' {{hilite | (See '''Figure 13.3.2.2.-B''' and '''Figure 13.3.2.2.-C''')|| 2026-October-31 }} must be secured through flashing tab (leaf) with at least one (1) acceptable low-profile flat head screw when the seam is longer than 101.6 mm (4”), but fasteners must not be spaced more than 203.2 mm (8”) O.C.
 <br>
 <br>
-::{|
 |-
 |-
-| colspan="1"; style="text-align:center;width:450px;" | {{hilite | {{hilite | '''Figure 13.3.2.2.-B S-Lock, Double''' || 2026-October-31 }}<br>Forming Part of Sentence 13.3.2.2.(11)<br><small>(Click to expand illustration)</small> || 2025-October-25 }}
+| colspan="1"; style="text-align:center;width:600px;" | {{hilite | '''Figure 13.3.2.2.-B S-Lock, Single'''|| 2026-October-31 }}<br>Forming Part of Sentence 13.3.2.2.(11)<br><small>(Click to expand illustration)</small> || colspan="1"; style="text-align:center;width:600px;" | {{hilite | '''Figure 13.3.2.2.-C S-Lock, Double'''|| 2026-October-31 }}<br>Forming Part of Sentence 13.3.2.2.(11)<br><small>(Click to expand illustration)</small>
 |-
-| [[File:MF - S-Lock, Double.png | link=https://rpm.rcabc.org/images/b/b6/MF_-_S-Lock%2C_Double.png | 500 px]]
+| [[File:MF - S-Lock, Single.png | link=https://rpm.rcabc.org/images/0/09/MF_-_S-Lock%2C_Single.png | 500 px]] || [[File:MF - S-Lock, Double.png | link=https://rpm.rcabc.org/images/b/b6/MF_-_S-Lock%2C_Double.png | 500 px]]
 |}
 <li>'''Flat butt seams''' {{hilite | (See '''Figures 13.3.2.2.-C''' and '''13.3.2.2.-D''') || 2026-October-31 }}
@@ Line 5,790: / Line 5,792: @@
 |-
 |-
-| colspan="1"; style="text-align:center;width:450px;" | {{hilite | '''Figure 13.3.2.2.-C Flat butt seams''' || 2026-October-31 }}<br>{{hilite | Forming Part of Article 13.3.2.2. || 2026-October-31 }}<br><small>(Click to expand illustration)</small>
+| colspan="1"; style="text-align:center;width:600px;" | {{hilite | '''Figure 13.3.2.2.-C Flat butt seams''' || 2026-October-31 }}<br>{{hilite | Forming Part of Article 13.3.2.2. || 2026-October-31 }}<br><small>(Click to expand illustration)</small>
 |-
 | [[File:Part 13 - Illustration - Figure 13.3.2.2.-C.png|link=https://rpm.rcabc.org/images/f/f0/Part_13_-_Illustration_-_Figure_13.3.2.2.-C.png | 600 px]]
@@ Line 5,798: / Line 5,800: @@
 |-
 |-
-| colspan="1"; style="text-align:center;width:450px;" | {{hilite | '''Figure 13.3.2.2.-D Flat butt seams''' || 2026-October-31 }}<br>{{hilite | Forming Part of Article 13.3.2.2. || 2026-October-31 }}<br><small>(Click to expand illustration)</small>
+| colspan="1"; style="text-align:center;width:600px;" | {{hilite | '''Figure 13.3.2.2.-D Flat butt seams''' || 2026-October-31 }}<br>{{hilite | Forming Part of Article 13.3.2.2. || 2026-October-31 }}<br><small>(Click to expand illustration)</small>
 |-
 | [[File:Part 13 - Illustration - Figure 13.3.2.2.-D.png|link=https://rpm.rcabc.org/images/9/92/Part_13_-_Illustration_-_Figure_13.3.2.2.-D.png | 600 px]]
@@ Line 5,838: / Line 5,840: @@
 <li>Where cleats (“wind clips”) are required, they must
 <ol>
-<li>{{hilite | conform to the fabrication requirements in || 2026-October-31 }} [[#13.2.2.1. Fabrication of Flashing | {{hilite | Article 13.2.2.1.|| 2026-October-31 }}]]{{hilite | , and || 2026-October-31}}
+<li>{{hilite | conform to the fabrication requirements in [[#13.2.2.1. Fabrication of Flashing | Article 13.2.2.1.]], and || 2026-October-31}}
 <li>be fastened as close to the bottom edge (hook) as practical but must not be fastened further than a maximum of {{hilite | 25.4 mm (1") || 2026-October-31 }} from the bottom edge (hook).
 </li></ol>

@@ Line 77: / Line 77: @@
 <div style="text-align:center">
 '''First Edition''': October 18, 2019
-<br>'''Previous Edition''': June 12, 2025
+<br>'''Previous Edition''': November 1, 2025
-<br>'''Current Edition''': Adopted October 24, 2025
+<br>'''Current Edition''': Adopted January 20, 2026
 <br><br>
-All changes to this Standard are effective<br><big>'''November 1, 2025'''</big>
+All changes to this Standard are effective<br><big>'''February 1, 2026'''</big>
 </div>
 <div style="text-align:center">
@@ Line 153: / Line 153: @@
 ===={{hilite | 1.1.1.8. Pre-Design Requirements || 2025-October-25 }}====
 <ol>
-<li>The ''Coordinating Registered Professional'' is responsible to ensure that the ''roof assembly'' design is a multi-disciplinary enterprise that aligns with the designs for structural, plumbing, mechanical, electrical, architectural, and building envelope, together with all trades whose work intersects with the ''Contractor’s'' scope of work, to minimize out-of-sequence operations that could compromise the integrity of the completed ''roof assembly''.
+<li>When a ''project'' is designed by an architectural or consulting firm (typically, this applies only to "new construction" ''projects''), the ''Coordinating Registered Professional'' is responsible to ensure that the ''roof assembly'' design is a multi-disciplinary enterprise that aligns with the designs for structural, plumbing, mechanical, electrical, architectural, and building envelope, together with all trades whose work intersects with the ''Contractor’s'' scope of work, to minimize out-of-sequence operations that could compromise the integrity of the completed ''roof assembly''.
 </li></ol>
@@ Line 2,210: / Line 2,211: @@
 </li></ol>
-====7.1.3.4. Effective Thermal Resistance and Layering====
+====7.1.3.4. {{strike| Effective || 2026-January-31 }} {{hilite | Thermal Resistance and Layering|| 2027-February-1 }}====
 (See [[Notes to PVC Standard#A-7.1.3.4.| {{hilite | Note A-7.1.3.4.|| 2025-October-25 }}]])
@@ Line 2,450: / Line 2,451: @@
 <li>{{hilite | Closed-cell Spray Foam insulation (medium density) shall conform to either CAN/ULC-S705.1, "STANDARD FOR THERMAL INSULATION – SPRAY APPLIED RIGID POLYURETHANE FOAM, MEDIUM DENSITY – MATERIAL SPECIFICATION" (latest edition) or CAN/ULC-S711.1, “STANDARD FOR BEAD-APPLIED TWO COMPONENT POLYURETHANE AIR SEALANT FOAM, PART 1: MATERIAL SPECIFICATION” (latest edition) (Note: the applicable standard
 depends on the application) and may, when appropriate, serve as a vapour retarder or sealant || 2026-October-31 }}.
-<li>{{hilite | Open-cell Spray Foam insulation (low-density and commonly purchased off-the-shelf) shall conform to CAN/ULC S710.1, “STANDARD FOR BEAD-APPLIED ONE COMPONENT POLYURETHANE AIR SEALANT FOAM, PART 1: MATERIAL SPECIFICATION” (latest edition) and is permissible only for filling gaps larger than 6.35 mm (1/4") between insulation panels or around penetrations, when the insulation assembly is offset and staggered in keeping with Article 7.3.2.2.; it is not suitable for, and may not be used to, reseal (repair) a breach in the air or vapour control layers || 2026-October-31 }}.
+<li>{{hilite | Open-cell Spray Foam insulation (low-density and commonly purchased off-the-shelf) shall conform to CAN/ULC S710.1, “STANDARD FOR BEAD-APPLIED ONE COMPONENT POLYURETHANE AIR SEALANT FOAM, PART 1: MATERIAL SPECIFICATION” (latest edition) and is permissible only for filling {{hilite | minor gaps|| 2027-February-1 }} {{strike| larger than 6.35 mm (1/4")|| 2026-January-31 }} between insulation panels or around penetrations, when the insulation assembly is offset and staggered in keeping with|| 2027-February-1 }} [[#7.3.2.2. Alignment, Sizing, and Support | {{hilite | Article 7.3.2.2.|| 2027-February-1 }}]]{{hilite |; it is not suitable for, and may not be used to, reseal (repair) a breach in the air or vapour control layers|| 2026-October-31 }}.
 </li></ol>
@@ Line 2,515: / Line 2,516: @@
 | [[File:Figure 7.3.2.-B (Generic conv.).jpg|link=https://rpm.rcabc.org/images/e/ed/Figure_7.3.2.-B_%28Generic_conv.%29.jpg | 600 px]]
 |}
-<li>{{hilite | Where penetrations or their flashings pass through an insulation system, any voids larger than 6.35 mm (1/4") around them must be insulated with a spray foam insulation conforming to the material requirements in || 2026-October-31 }} [[#7.2.2.5. Spray Foam Insulation | {{hilite | Article 7.2.2.5. || 2026-October-31 }}]]{{hilite | , to reduce the potential for condensation || 2026-October-31 }}.
+<li>{{hilite | Where penetrations or their flashings pass through an insulation system, any {{hilite | minor voids less than 25.4 mm (1”) || 2027-February-1 }}{{strike| voids larger than 6.35 mm (1/4") || 2026-January-28 }} around them must be insulated with a spray foam insulation conforming to the material requirements in [[#7.2.2.5. Spray Foam Insulation | Article 7.2.2.5.]], to reduce the potential for condensation|| 2026-October-31 }}.
 </li></ol>
@@ Line 4,189: / Line 4,190: @@
 <ol>
 <li>The ''Design Authority'' is responsible for the design of roof drainage {{hilite | and ''continuity'' of ''control layers'', where these intersect with any part of the designed roof drainage system (Ref. || 2024-June-15 }} [[#3.1.5.1. Securement against Specified Wind Loads | Article 3.1.5.1.]]; {{hilite | also see || 2024-June-15 }} [[#6.1.3.2. Continuity of Control Layers | Article 6.1.3.2.]]).
-<li><span class="recommended">{{hilite | The incorporation of properly sized and located overflows is strongly encouraged || 2026-October-31 }}</span> {{hilite | (Also see || 2026-October-31 }} [[#11.1.4.2. Scuppers and Overflows | {{hilite |Article 11.1.4.2.|| 2026-October-31 }}]]).
+<li>{{hilite | Whereas the Building Code may not require the inclusion of overflows in all circumstances, and the RGC Standards require overflows in some locations (e.g., in membrane-lined gutters),|| 2027-February-1 }} <span class="recommended">{{hilite | the incorporation of properly sized and located overflows, on roofs that may collect water, is strongly encouraged even where they are not required, for new construction and for replacement roofing|| 2027-February-1 }}</span> {{hilite | (Also see [[#11.1.4.2. Scuppers and Overflows | Article 11.1.4.2.]])|| 2027-February-1 }}.
 <li>{{hilite |The size (flow rate) of roof drains and ''overflows'' must be determined using the "British Columbia Building Code" and "British Columbia Plumbing Code", with attention given to both average and large rainfall events (for rainfall capacities, refer to the|| 2021-October-30 }} [https://free.bcpublications.ca/civix/document/id/public/bcbc2018/bcbc_2018dbacr2 "British Columbia Building Code", Div. B, Appendix C, "Table C-2"], {{hilite |which lists rainfall loads using specific reference locations throughout the province|| 2021-October-30 }}.  {{hilite | See || 2026-October-31 }} [[#11.1.3.2. Roof Drain Function and Location | {{hilite | Articles 11.1.3.2. || 2026-October-31 }}]] {{hilite | and || 2026-October-31 }} [[#11.1.4.2. Scuppers and Overflows | {{hilite | 11.1.4.2. || 2026-October-31 }}]] {{hilite | for function and location || 2026-October-31 }}.
 <li>Membrane gutters must be designed for their anticipated capacity, with consideration given to
@@ Line 6,480: / Line 6,481: @@
 <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>
 {{Template:RPM Page Footer with Copyright and Current Date}}

@@ Line 406: / Line 406: @@
 <ol>
-<li>{{hilite | Recovering (installing a new ''membrane system'' over an in-service || 2026-October-31 }}{{strike| existing || 2025-October-22 }} {{hilite | ''membrane system'') || 2026-October-31 }} <span class="recommended">{{hilite | is not a recommended practice and wiull limit the scope of coverage under the || 2026-October-31 }}</span> {{hilite | '''''RoofStar Guarantee''''', but it is acceptable to the '''''Guarantor''''' only when the following conditions, in addition to any other applicable requirements published in this Article or in Article 1.3.3.4., have been satisfied || 2026-October-31 }}:
+<li>{{hilite | Recovering (installing a new ''membrane system'' over an in-service || 2026-October-31 }}{{strike| existing || 2025-October-22 }} {{hilite | ''membrane system'') || 2026-October-31 }} <span class="recommended">{{hilite | is not a recommended practice and will limit the scope of coverage under the || 2026-October-31 }}</span> {{hilite | '''''RoofStar Guarantee''''', but it is acceptable to the '''''Guarantor''''' only when the following conditions, in addition to any other applicable requirements published in this Article or in Article 1.3.3.4., have been satisfied || 2026-October-31 }}:
 <ol>
 <li>{{hilite | the in-service roof has never before been recovered (recovering is not permitted over a previously recovered ''roof system'') || 2026-October-31 }},