Notes to SBS Standard - Revision history

James Klassen: /* Notes to Part 12 */

2026-06-16T18:24:54Z

‎Notes to Part 12

James Klassen: /* Notes to Part 13 */

2026-06-16T18:17:53Z

‎Notes to Part 13

James Klassen: /* A-7.1.3.4. Thermal Resistance and Layering */

2026-05-22T14:51:40Z

‎A-7.1.3.4. Thermal Resistance and Layering

James Klassen: /* A-7.1.3.4. Effective Thermal Resistance and Layering */

2026-05-22T14:47:32Z

‎A-7.1.3.4. Effective Thermal Resistance and Layering

James Klassen at 14:41, 31 October 2025

2025-10-31T14:41:34Z

James Klassen at 21:00, 26 June 2025

2025-06-26T21:00:48Z

Show changes

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 ===<big><span class="reference">Notes to Part 12</span></big>===
-<div id=A-12.3.2.1.(9)(1)></div>
+<div id=A-12.3.2.1.(14)(4)></div>
-====A-12.3.2.1.(9)(1) Wood Blocking to Support Metal-Flanged Flashing====
+====A-12.3.2.1.(14)(4) Wood Blocking to Support Metal-Flanged Flashing====
 :Wood blocking (Sentence 9) provides support for the edge of metal-flanged penetrations and is required by single-ply membrane manufacturers. Support for flanges must extend beyond the edge of the flange to keep the edge from cutting the membrane; hence, the 12.7 mm (1/2") requirement. In a ''conventionally insulated roof system'', the blocking must be located directly beneath the flange. Blocking must be securely fastened to the roof structure (deck) to ensure wind uplift resistance; placement of the blocking above layers of insulation minimizes thermal loss through bridging.

@@ Line 576: / Line 576: @@
 <div id=A-13.2.1.2.(3)(2)></div>
 ===={{hilite | A-13.2.1.2.(3)(2) Stainless Steel|| 2026-July-1 }}====
-Stainless steel is a good product to use when roof penetrations or metal flashings are exposed to constant water, are used in marine environments (salt-water), or are exposed to highly corrosive by-products from industrial sites. Stainless steel is available in two grades for the roofing industry: Grade 304 And Grade 316.
+:Stainless steel is a good product to use when roof penetrations or metal flashings are exposed to constant water, are used in marine environments (salt-water), or are exposed to highly corrosive by-products from industrial sites. Stainless steel is available in two grades for the roofing industry: Grade 304 And Grade 316.
-Grade 304 stainless steel is perhaps the most common austenitic stainless steel.  This type of stainless steel is characterized by a specific crystal structure called austenite.  The result is a stainless steel that resists corrosion, is highly ductile, and exhibits good welding properties. In addition to iron, grade 304 stainless steel contains a high nickel content (8 to 10.5 percent by weight on average), and a high amount of chromium (18 to 20 percent by weight). It also contains other alloying elements such as manganese, silicon, and carbon.  The high chromium and nickel content is the reason behind grade 304 stainless steel’s excellent corrosion resistance. 304 stainless steel is commonly used in environments where even galvanized carbon steel likely would corrode, or where leaching zinc from galvanized steel may harm water habitats.
+:Grade 304 and 316 stainless steels behave differently because of their molecular structure (explained below). Grade 304 can be thinner than Grade 316, because of differences in ductility. Grade 304 stainless steel is typically less costly than grade 316 stainless, but it is also suitable for applications where formability is desirable.  This is why Grade 304 is permitted for linear metal flashings.  Conversely, Grade 316 stainless steel is the preferred choice for environments that are highly corrosive, where the material will be consistently exposed to or immersed in water, and in applications where superior strength and hardness are required.  Grade 316L has superior corrosion resistance over Grade 316 stainless steel because of its low (L) carbon content.  Therefore, for consistency in RGC requirements, and to improve the corrosion resistance of stainless steel used in the '''''RoofStar Guarantee Program''''', the Standard recognizes only Grade 316L for roof drains, overflows, and penetration flashings.
-Grade 316L stainless steel has high amounts of chromium and nickel, much like grade 304 stainless, and it also contains silicon, manganese, and carbon (in addition to iron). However, grade 316 stainless steel also contains 2 to 3 percent molybdenum (by weight), compared to only trace amounts found in 304 stainless steel. Higher molybdenum content produces a superior corrosion-resistant stainless steel. Grade 316L stainless steel is often considered one of the most suitable choices for marine applications.
+:Grade 304 stainless steel is perhaps the most common austenitic stainless steel.  This type of stainless steel is characterized by a specific crystal structure called austenite.  The result is a stainless steel that resists corrosion, is highly ductile, and exhibits good welding properties. In addition to iron, grade 304 stainless steel contains a high nickel content (8 to 10.5 percent by weight on average), and a high amount of chromium (18 to 20 percent by weight). It also contains other alloying elements such as manganese, silicon, and carbon.  The high chromium and nickel content is the reason behind grade 304 stainless steel’s excellent corrosion resistance. 304 stainless steel is commonly used in environments where even galvanized carbon steel likely would corrode, or where leaching zinc from galvanized steel may harm water habitats.
 <div id=A-13.2.2.1.(4)></div>
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 ===={{hilite | A-13.2.2.1.(4) Coefficient of expansion and securement of linear metal flashings|| 2026-October-31 }}====
-{{hilite | The coefficient of thermal expansion is the mathematical expression of linear movement one can expect of a particular metal when it is exposed to changes in temperature. Alloys will change these properties, which is why it is important to know the metal's composition. || 2026-October-31 }}
+:{{hilite | The coefficient of thermal expansion is the mathematical expression of linear movement one can expect of a particular metal when it is exposed to changes in temperature. Alloys will change these properties, which is why it is important to know the metal's composition. || 2026-October-31 }}
-{{hilite | Because the degree of linear movement increases with flashing length, the ''registered professional'' responsible for designing ''linear metal flashing'' securement should consider anchoring the mid-point of very long flashings to allow for bi-directional expansion. However, each solution presents its own challenges. Affixing flashings at an end or in the middle forces expansion and contraction away from the anchoring point. This must be considered when designing a system of flashings where each length of material is attached to another. || 2026-October-31 }}
+:{{hilite | Because the degree of linear movement increases with flashing length, the ''registered professional'' responsible for designing ''linear metal flashing'' securement should consider anchoring the mid-point of very long flashings to allow for bi-directional expansion. However, each solution presents its own challenges. Affixing flashings at an end or in the middle forces expansion and contraction away from the anchoring point. This must be considered when designing a system of flashings where each length of material is attached to another. || 2026-October-31 }}
 ===<big><span class="reference">Notes to Part 14</span></big>===

@@ Line 379: / Line 379: @@
 <div id=A-7.1.3.4.></div>
-====A-7.1.3.4. Thermal Resistance and Layering====
+====A-7.1.3.4. {{strike| Effective || 2026-January-31 }} {{hilite | Thermal Resistance and Layering|| 2027-February-1 }}====
 :{{hilite | In warm seasons, the roof surface may reach temperatures higher than 85°C (185°F), affecting the performance and stability of some insulation. Consequently, the requirement which limits panel size in single-layer applications ensures that inevitable gaps between adjacent panels are kept to a minimum.  Combining insulation types in a ''roof system'' may help mitigate these temperature swings and the consequence of thermal contraction. The ''Design Authority'' therefore must consider these variables when specifying materials and their installation. || 2023-June-16 }}

@@ Line 379: / Line 379: @@
 <div id=A-7.1.3.4.></div>
-====A-7.1.3.4. Effective Thermal Resistance and Layering====
+====A-7.1.3.4. Thermal Resistance and Layering====
 :{{hilite | In warm seasons, the roof surface may reach temperatures higher than 85°C (185°F), affecting the performance and stability of some insulation. Consequently, the requirement which limits panel size in single-layer applications ensures that inevitable gaps between adjacent panels are kept to a minimum.  Combining insulation types in a ''roof system'' may help mitigate these temperature swings and the consequence of thermal contraction. The ''Design Authority'' therefore must consider these variables when specifying materials and their installation. || 2023-June-16 }}

@@ Line 1: / Line 1: @@
 {{Template:RPM Info}}
@@ Line 104: / Line 103: @@
 <div id=A-1.1.4.4.></div>
-===={{hilite | A-1.1.4.4 Membrane Recovering || 2025-October-25 }}====
+===={{hilite | A-1.1.4.4. Membrane Recovering || 2025-October-25 }}====
 :When membrane replacement is not practical, membrane recovering is an acceptable method for renewing the weatherside surface of a ''waterproofing roof assembly'' when most if not all of the other components (insulation and the air barrier) remain undamaged and undisturbed.  It does not require the removal of any ''roof system'' components, but it does require an assessment beforehand, to determine the integrity of the existing ''roof system''.  A '''''RoofStar Guarantee''''' cannot respond to existing water inside the system, which is why they must be surveyed for moisture by a qualified professional, and the report provided to the '''''Guarantor''''' as part of the submission for a Variance.  However, because the requirements in Part 3 apply to both new and replacement roofing, securing new materials on top of existing materials becomes challenging and critical.
@@ Line 110: / Line 109: @@
 :Cutting the existing membrane is also necessary to relieve diaphragm-like tension that could distort the new ''roof system'', particularly at the perimeter.  It also allows any existing moisture in the roof system to move around and prevents the existing membrane from acting as an intermediate vapour retarder that could adversely affect the performance of the recovered ''roof system''.
 <div id=A-1.3.2.2.></div>
@@ Line 175: / Line 179: @@
 ====A-2.1.5.5. Overlays for Mass Timber Decks====
 :An overlay may be required by the ''manufacturer'' for these types of wood decks to protect membranes from wood sap, deck surface irregularities, and protruding fasteners.
 <div id=A-2.1.7.></div>
 ====A-2.1.7. Walls====
 :''Walls'' and roofs intersect either directly (where the ''wall'' structurally connects to the roof structure, so that both move together), or indirectly (where the roof structure and the ''wall'' structure are independent of each other, so that the movement of one does not affect the other).  These locations require an expansion joint.
@@ Line 380: / Line 392: @@
 :{{hilite | The requirement to use a layer of heat-resistant insulation on top of heat-sensitive insulation is based on a mathematical modeling of the buffering effects of different overlay strategies.  While modeling showed some insulation overlay panels reduced some absorbed heat, none reduced heat below the service temperature of the insulation, and none provided sufficient margin to allow for high-heat weather events.  Only heat-resistant insulation measuring at least 50 mm (2") thick offered the necessary level of protection to prevent insulation damage. || 2023-June-16 }}
 <div id=A-7.2.2.3.></div>
@@ Line 506: / Line 527: @@
 ====A-11.1.4.2. Scuppers and Overflows====
-:{{hilite | The primary function of an overflow is to keep a roof from collapsing when primary roof drains are plugged or cannot drain heavy rainfall.  New and existing buildings should incorporate overflows to handle large rain events.  Refer to the "British Columbia Building Code" and the "British Columbia Plumbing Code" for drain sizing and location requirements. || 2023-June-16 }}
+:{{hilite | The primary function of an ''overflow'' is to keep a roof from collapsing when primary roof drains are plugged or cannot drain heavy rainfall.  New and existing buildings should incorporate overflows to handle large rain events.  Refer to the "British Columbia Building Code" and the "British Columbia Plumbing Code" for drain sizing and location requirements. || 2023-June-16 }}
 <div id=A-11.1.4.3.></div>
@@ Line 545: / Line 582: @@
 Grade 316L stainless steel has high amounts of chromium and nickel, much like grade 304 stainless, and it also contains silicon, manganese, and carbon (in addition to iron). However, grade 316 stainless steel also contains 2 to 3 percent molybdenum (by weight), compared to only trace amounts found in 304 stainless steel. Higher molybdenum content produces a superior corrosion-resistant stainless steel. Grade 316L stainless steel is often considered one of the most suitable choices for marine applications.
 ===<big><span class="reference">Notes to Part 14</span></big>===