(Draft) Notes to ASM Standard - Revision history

James Klassen: /* A-9.2.1.5. Clips */

2026-06-23T18:23:22Z

‎A-9.2.1.5. Clips

James Klassen: /* A-9.2.1.5. Clips */

2026-06-23T18:20:45Z

‎A-9.2.1.5. Clips

James Klassen: /* Notes to Part 9 */

2026-06-23T18:20:05Z

‎Notes to Part 9

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

2026-01-28T15:58:10Z

‎A-7.1.3.4. Effective Thermal Resistance and Layering

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

2026-01-19T22:41:09Z

‎A-7.1.3.4. Effective Thermal Resistance and Layering

James Klassen: /* A-2.1.5.5. All Wood Roof Decks */

2025-08-20T21:34:55Z

‎A-2.1.5.5. All Wood Roof Decks

Show changes

← Older revision		Revision as of 18:23, 23 June 2026
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	<div id=A-9.2.1.5.></div>		<div id=A-9.2.1.5.></div>
−
−	~~====A-9.2.1.5. Clips====~~
−	~~:Refer to [[#A-3.1.3.4. Design to Resist Other Loads \| Note A-3.1.3.4.]]~~

	===<big><span class="reference">Notes to Part 10</span></big>===		===<big><span class="reference">Notes to Part 10</span></big>===

@@ Line 278: / Line 278: @@
 ====A-9.2.1.5. Clips====
-:Refer to Note A-3.1.3.4.
+:Refer to [[#A-3.1.3.4. Design to Resist Other Loads | Note A-3.1.3.4.]]
 ===<big><span class="reference">Notes to Part 10</span></big>===

← Older revision		Revision as of 18:20, 23 June 2026
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	:Finally, when segmenting panels is permitted by a Variance, each panel should be secured so that it moves independently of the other. This will necessitate a careful design of the transition so that the panels are properly secured to resist expected service conditions and loads, while simultaneously ensuring freedom of expansion and contraction and effective drainage.		:Finally, when segmenting panels is permitted by a Variance, each panel should be secured so that it moves independently of the other. This will necessitate a careful design of the transition so that the panels are properly secured to resist expected service conditions and loads, while simultaneously ensuring freedom of expansion and contraction and effective drainage.
		+
		+	<div id=A-9.2.1.3.(1)></div>
		+
		+	===={{hilite \| A-9.2.1.3.(1) PVDF Pre-painted Finishes\|\| 2027-June-11 }}====
		+	:PVDF coatings have a reputation for providing superior protection from extreme temperatures, sun exposure, oxygen, humidity, and airborne pollution (particulate). Formulated to retain their colour, PVDF coatings resist chalking and fading, and will also resist cracking, flaking, and peeling (film adhesion). Said to be ideal where bright colours are desirable, PVDF is also softer than its competitor, SMP. This makes PVDF more flexible, resisting cracking when bent tightly. However, it also means PVDF can be more susceptible to scratching and scuffing; the material is delivered with a protective film which is removed after installation.
		+
		+	:While SMP coatings can provide superior scratch resistance when compared to PVDF they are likely to chalk and fade more than PVDF coated metals, especially when significantly exposed to ultraviolet light. Some manufacturers recommend SMP for less vivid colour choices.

	<div id=A-9.2.1.5.></div>		<div id=A-9.2.1.5.></div>

@@ Line 211: / Line 211: @@
 <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 }}
@@ Line 219: / Line 219: @@
 <div id=A-7.1.3.4.(4)></div>
 ===={{hilite | A-7.1.3.4.(4) Thermal Bridging and Dewpoint|| 2026-February-1 }}====
 :{{hilite | While every effort is made by suppliers and installers to keep roofing materials dry, some moisture will always find its way inside the built assembly, usually turning to vapour.  In certain climates and weather conditions, particularly because of snow cover, the dew point may fall inside the ''roof assembly'', turning entrapped water vapour to liquid on a condensing surface, such as a metal girt.  Water inside the ''roof system'' can reduce thermal performance, cause corrosion (e.g., on the cut edges of girts, which are not galvanized), and may present as a leak inside the building due to discontinuities in assembly intersections (roof-to-wall) or vapour and air control layers.  Condensation of any sort is not a leak and therefore isn't covered by a '''''RoofStar Guarantee''''' (Refer to || 2026-February-1 }} [https://rpm.rcabc.org/index.php?title=Guarantee#3.2.1.2._Limitations_and_Exclusions_of_Guarantee {{hilite | Article 3.2.1.2.|| 2026-February-1 }}]{{hilite | in Division A of the RPM for limitations and exclusions).  Consequently, the ''Design Authority'' must consider the overall thermal performance expectations of the roof, along with the design requirements for (or, in the case of roof replacement, the condition of) the entire building enclosure, and use appropriate methods for supporting panel clips|| 2026-February-1 }}.

← Older revision		Revision as of 22:41, 19 January 2026
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	:{{hilite \| The "Long-Term Thermal Resistance" (LTTR) measurement of closed-cell insulation materials remains the standard by which insulation performance is measured. Published R-values should reflect the LTTR of the material. In Canada, two principal standards apply to the accurate measurement of thermal resistance: CAN/ULC-S770 ("Standard Test Method for Determination of Long-Term Thermal Resistance of Closed-Cell Thermal Insulating Foams") and CAN/ULC-S704.1 ("Standard for Thermal Insulation, Polyurethane and Polyisocyanurate, Boards, Faced"). \|\| 2023-June-16 }}		:{{hilite \| The "Long-Term Thermal Resistance" (LTTR) measurement of closed-cell insulation materials remains the standard by which insulation performance is measured. Published R-values should reflect the LTTR of the material. In Canada, two principal standards apply to the accurate measurement of thermal resistance: CAN/ULC-S770 ("Standard Test Method for Determination of Long-Term Thermal Resistance of Closed-Cell Thermal Insulating Foams") and CAN/ULC-S704.1 ("Standard for Thermal Insulation, Polyurethane and Polyisocyanurate, Boards, Faced"). \|\| 2023-June-16 }}
		+
		+	<div id=A-7.1.3.4.(4)></div>
		+	===={{hilite \| A-7.1.3.4.(4) Thermal Bridging and Dewpoint\|\| 2026-February-1 }}====
		+	:{{hilite \| While every effort is made by suppliers and installers to keep roofing materials dry, some moisture will always find its way inside the built assembly, usually turning to vapour. In certain climates and weather conditions, particularly because of snow cover, the dew point may fall inside the ''roof assembly'', turning entrapped water vapour to liquid on a condensing surface, such as a metal girt. Water inside the ''roof system'' can reduce thermal performance, cause corrosion (e.g., on the cut edges of girts, which are not galvanized), and may present as a leak inside the building due to discontinuities in assembly intersections (roof-to-wall) or vapour and air control layers. Condensation of any sort is not a leak and therefore isn't covered by a '''''RoofStar Guarantee''''' (Refer to \|\| 2026-February-1 }} [https://rpm.rcabc.org/index.php?title=Guarantee#3.2.1.2._Limitations_and_Exclusions_of_Guarantee {{hilite \| Article 3.2.1.2.\|\| 2026-February-1 }}]{{hilite \| in Division A of the RPM for limitations and exclusions). Consequently, the ''Design Authority'' must consider the overall thermal performance expectations of the roof, along with the design requirements for (or, in the case of roof replacement, the condition of) the entire building enclosure, and use appropriate methods for supporting panel clips\|\| 2026-February-1 }}.

	<div id=A-7.1.4.2.></div>		<div id=A-7.1.4.2.></div>