(Draft) Notes to SBS Standard - Revision history

James Klassen: /* Notes to Part 13 */

2026-06-16T18:29:44Z

‎Notes to Part 13

James Klassen: /* Notes to Part 12 */

2026-06-16T18:29:06Z

‎Notes to Part 12

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

2026-01-28T15:58:51Z

‎A-7.1.3.4. Effective Thermal Resistance and Layering

James Klassen: /* Notes to Part 13 */

2025-10-31T14:40:56Z

‎Notes to Part 13

James Klassen: /* Notes to Part 2 */

2025-10-31T14:30:18Z

‎Notes to Part 2

James Klassen: /* A-11.1.4.2. Scuppers and Overflows */

2025-10-29T22:15:11Z

‎A-11.1.4.2. Scuppers and Overflows

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 <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>===

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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.

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 <div id=A-7.1.3.4.></div>
-====A-7.1.3.4. Effective Thermal Resistance and Layering====
+====A-7.1.3.4. {{strike| Effective || 2026-January-28 }} {{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 }}

← Older revision		Revision as of 14:40, 31 October 2025
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	<div id=A-13.2.2.1.(4)></div>		<div id=A-13.2.2.1.(4)></div>
		+
	===={{hilite \| A-13.2.2.1.(4) Coefficient of expansion and securement of linear metal flashings\|\| 2026-October-31 }}====		===={{hilite \| A-13.2.2.1.(4) Coefficient of expansion and securement of linear metal flashings\|\| 2026-October-31 }}====

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 <div id=A-2.1.5.6.></div>
-===={{hilite | A-2.1.5.6. Non-veneered Panel Roof Decks || 2026-October-22 }}====
+===={{hilite | A-2.1.5.6. Non-veneered Panel Roof Decks || 2026-October-31 }}====
 :{{hilite | In 2024, the "Special Interest Group for the Dynamic Evaluation of Roof Systems" (SIGDERS) completed a study of wood ''decks'' and the holding strength of mechanical fasteners used in membrane ''roof systems''. They found significantly low resistance values from all grades of non-veneered wood ''decks'' (e.g., oriented strand board, or OSB) when compared with 12.7 mm (1/2") fir plywood. As a result, the study recommended avoiding non-veneered wood panels for commercial roof decking|| 2026-October-31 }}.