(Draft) TPO Roof Systems Standard - Revision history

James Klassen: /* 2.1.1.2. {{strike| Definitions || 2024-October-23 }}{{hilite | Defined Terms || 2025-October-25 }} */

2026-06-24T21:11:43Z

‎2.1.1.2. {{strike| Definitions || 2024-October-23 }}{{hilite | Defined Terms || 2025-October-25 }}

James Klassen at 14:50, 22 June 2026

2026-06-22T14:50:17Z

Show changes

James Klassen: /* 1.1.1.4. {{strike| Definitions || 2024-October-23 }}{{hilite | Defined Terms || 2025-October-25 }} */

2026-06-22T14:34:45Z

‎1.1.1.4. {{strike| Definitions || 2024-October-23 }}{{hilite | Defined Terms || 2025-October-25 }}

James Klassen: /* 1.1.1.4. {{strike| Definitions || 2024-October-23 }}{{hilite | Defined Terms || 2025-October-25 }} */

2026-06-22T14:30:43Z

‎1.1.1.4. {{strike| Definitions || 2024-October-23 }}{{hilite | Defined Terms || 2025-October-25 }}

James Klassen: /* 11.1.3.2. Roof Drain Function and Location */

2026-05-11T14:36:57Z

‎11.1.3.2. Roof Drain Function and Location

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

2026-04-20T14:56:27Z

‎11.2.1.3. Membrane Gutters and Gutter Liners

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

2026-04-20T14:55:53Z

‎11.2.1.3. Membrane Gutters and Gutter Liners=

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

2026-04-10T20:58:54Z

‎3.1.3.2. Calculation of Specified Wind Loads

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

2026-03-31T16:40:49Z

‎3.1.3.2. Calculation of Specified Wind Loads

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

2026-03-27T16:34:54Z

‎9.3.2.1. Preparation of Substrate

@@ Line 659: / Line 659: @@
 <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 124: / Line 124: @@
 {{strike| {{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 }}. || 2026-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'' 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 }}.
 {{strike| {{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 }}.|| 2026-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 || 2025-October-25 }}.

@@ Line 121: / Line 121: @@
 <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 | ''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 | ''Guarantor'' (used interchangeably with '''''RGC''''') means the RCABC Guarantee Corporation, which offers the '''''RoofStar Guarantee'''''. || 2023-June-16 }}
 <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 || 2025-October-25 }}.
 <li>{{hilite | ''Qualified roof condition surveyor'' means a person trained and competent in the use and interpretation of infrared thermographic and electronic moisture scanning equipment, used in the condition assessment of a roof || 2026-October-31 }}.
 <li>{{hilite | ''Vegetated Roof Assembly'' (''VRA''), used interchangeably in the "RGC Standard for Vegetated Roofs" with ''green roof'' or ''green roofing'', means a functional arrangement of interacting components, inclusive of ''vegetation'', that is designed in conjunction with a supporting ''roof assembly'', is intended to both grow and flourish, and is often installed on a roof to control the rate of rainwater discharged through a storm drainage system || 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 4,276: / Line 4,276: @@
 <li>''Roof drains'' on new construction ''projects'' must be located at least {{hilite | 457.2 mm (18") || 2024-June-15 }} {{strike| 304.8 mm (12”) || 2023-June-15 }} away from any adjacent drain, penetration, upstand, edge, or wall (the separation space is measured between openings, excluding the flange), but this requirement does not apply to ''overflow drains'', ''scupper drains'', and membrane gutters (Ref. [[#11.3.3.7. Scuppers and Overflows | Article 11.3.3.7.]] for minimum requirements applicable to ''scuppers'' and ''overflows'').
 <li>{{hilite | Notwithstanding the requirements in Sentence (1), a cast iron ''roof drain'' with a sump receiver must be placed well away from any interference with drain securement. || 2024-June-15 }}
-<li>When {{hilite | a roof is replaced and || 2024-June-15 }} existing ''roof drain'' {{strike| and penetration locations || 2023-June-15 }} do not comply with the spacing requirements in this Part, the ''Design Authority'' must submit {{strike| a written request for a Variance, following the requirements in [[#1.1.3.6. Variances | Article 1.1.3.6., "Variances"]] || 2023-June-15 }}{{hilite | a drawn detail for a review by the '''''Guarantor'''''; the detail must incorporate the following requirements and principles, together with requirements in Subsection 11.3.3 || 2024-June-15 }}:
+<li>When {{hilite | a roof is replaced and || 2024-June-15 }} existing ''roof drains'' {{strike| and penetration locations || 2023-June-15 }} do not comply with the spacing requirements in this Part, the ''Design Authority'' must submit {{strike| a written request for a Variance, following the requirements in [[#1.1.3.6. Variances | Article 1.1.3.6., "Variances"]] || 2023-June-15 }}{{hilite | a drawn detail for a review by the '''''Guarantor'''''; the detail must incorporate the following requirements and principles, together with requirements in Subsection 11.3.3 || 2024-June-15 }}:
 <ol>
 <li><span class="principles">{{hilite | Specify sheet membrane flashing to seal in the drain to the field membrane (liquid membranes should be the last option) || 2024-June-15 }}</span>.

@@ Line 4,480: / Line 4,480: @@
 <li>must conform to the sheet metal requirements in [[#13.2.1.2. Sheet Metal Grade and Gauge | Article 13.2.1.2.]]
 </ol></li>
 </ol></li>

@@ Line 4,461: / Line 4,461: @@
 </li></ol>
-===11.2.1.3. Membrane Gutters and Gutter Liners====
+====11.2.1.3. Membrane Gutters and Gutter Liners====
 <ol>

@@ Line 1,048: / Line 1,048: @@
 <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 TPO Standard#A-3.1.1.1. | Note A-3.1.1.1.]]).
 </li></ol>

@@ Line 1,090: / Line 1,090: @@
 <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 3,169: / Line 3,169: @@
 <li>capable of accommodating ''roof system'' component movement,
 <li>clean,
-<li>adequately dry and frost-free {{hilite | (Ref. || 2023-October-28 }} [[TPO_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 3,187: / Line 3,187: @@
 <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 3,206: / Line 3,205: @@
 <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>