Membrane Surfaces - Revision history

James Klassen: /* Mineral Surface (Cap Sheet) */

2021-09-09T16:25:10Z

‎Mineral Surface (Cap Sheet)

James Klassen: /* Mineral Surface (Cap Sheet) */

2021-09-09T16:25:00Z

‎Mineral Surface (Cap Sheet)

James Klassen at 16:24, 9 September 2021

2021-09-09T16:24:28Z

James Klassen at 15:45, 9 September 2021

2021-09-09T15:45:02Z

James Klassen at 21:17, 3 September 2021

2021-09-03T21:17:03Z

James Klassen at 21:07, 3 September 2021

2021-09-03T21:07:35Z

James Klassen at 20:26, 26 July 2021

2021-07-26T20:26:45Z

James Klassen at 21:33, 22 September 2020

2020-09-22T21:33:06Z

James Klassen at 21:39, 17 June 2020

2020-06-17T21:39:18Z

James Klassen: /* Aggregate */

2016-10-17T17:23:26Z

‎Aggregate

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 * easier location of damages and defects for repair
 * less periodic maintenance
+<br>
 The possible disadvantages or precautions involved in the use of mineral surfaced roofing include:
 * higher initial cost

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 === Mineral Surface (Cap Sheet) ===
-It is possible, but not popular, to use a modified bituminous mineral-surfaced cap sheet (see [[Low-slope Membranes|'''Low Slope Membranes''']]). as the finished surface on a built-up roof membrane. It requires phased construction and, therefore, is not often used for built-up roofs in colder and wetter climates. Mineral-surfaced roofing provides the following properties and advantages:
+It is possible, but not popular, to use a modified bituminous mineral-surfaced cap sheet as the finished surface on a built-up roof membrane. It requires phased construction and, therefore, is not often used for built-up roofs in colder and wetter climates. Mineral-surfaced roofing provides the following properties and advantages:
 * lighter weight than aggregate
 * easier location of damages and defects for repair
 * less periodic maintenance
 The possible disadvantages or precautions involved in the use of mineral surfaced roofing include:

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 === Aggregate ===
 Aggregate surfacing usually consists of a suitable roofing gravel embedded into one or two pour coats of hot asphalt.
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 A &#8220;double pour and gravel&#8221; consists of a pour coat of 3.0 kg / m<sup>2</sup> (60 lb / square) asphalt with 20 kg / m<sup>2</sup> (400 lb / square) of gravel embedded into the pour coat. The loose gravel is then swept off and another pour coat and gravel (of the same quantities) is installed. A &#8220;modified double pour and gravel&#8221; is similar to a double pour except the first pour and gravel only consists of 2.0 kg / m<sup>2</sup> (40 lb / square) of asphalt and 10 kg / m<sup>2</sup> (200 lb / square) of gravel. An alternate method of a modified double pour and gravel is defined as 2 kg / m<sup>2</sup> (40 lb / square) of asphalt flood coat followed by an additional 3 kg / m<sup>2</sup> (60 lb / square) pour coat of asphalt followed by a 25 kg / m<sup>2</sup> (500 lb / square) application of gravel. These methods are not recommended on slopes over 1:24 (1/2" in 12"). Use a double or modified double pour at all roof corners exposed to wind and at the corners of penthouses where severe wind eddies occur.
-On protected membrane or modified protected membrane roof assemblies (PMRA or MPMRA), where the insulation is above the membrane, the gravel is used to protect the insulation from ultraviolet rays, wind uplift, and flotation.  Refer to the Protected and Modified Protected sections under '''[[RoofStar Guarantee Standards for SBS Roof Systems#MEMBRANES|Low Slope roof membranes]]''' for (insulation manufacturer) ballast weight requirements for the negative flotation of extruded polystyrene insulation.
+On protected membrane or modified protected membrane roof assemblies (PMRA or MPMRA), where the insulation is above the membrane, the gravel is used to protect the insulation from ultraviolet rays, wind uplift, and flotation.  For ballast and securement requirements, read [https://rpm.rcabc.org/index.php?title=Securing_the_Roof_Assembly '''Securing the Roof Assembly'''], and refer to Part 3 and Part 12 of the specific Standard, located in [[Division B | '''Division B: Standards''']].
-Aggregate or roofing gravel for conventional built-up roofing should generally be 6 mm (1/4") to 19 mm (3/4") washed crushed gravel or washed river bottom gravel. It should be dry and free of sharp angular pieces. It is important that the gravel is opaque and that white rock chips (frequently transparent) should only be used over roofing gravel. In all cases the gravel must cover the asphalt without leaving spaces. For PMRA's or MPMRA's the stone ballast should generally be 25 mm (1") clear size, free of fines or stones smaller than 15 mm (5/8") or larger than 35 mm (1-3/8"). (Consult the '''''RoofStar Guarantee Standards''''' for exact sieve size.)
+Aggregate or roofing gravel for conventional built-up roofing should generally be 6 mm (1/4") to 19 mm (3/4") washed crushed gravel or washed river bottom gravel. It should be dry and free of sharp angular pieces. It is important that the gravel is opaque and that white rock chips (frequently transparent) should only be used over roofing gravel. In all cases the gravel must cover the asphalt without leaving spaces. For PMRA's or MPMRA's the stone ballast should generally be 25 mm (1") clear size, free of fines or stones smaller than 15 mm (5/8") or larger than 35 mm (1-3/8"). (Consult the specific '''''RoofStar Guarantee''''' Standard for exact sieve size.)
 An aggregate-surfaced roof provides the following properties and advantages:

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 <big><big><big><big><big>Membrane Surfaces</big></big></big></big></big>
 {| class="wikitable" | style="color: black; background-color: #ffffcc; width: 100%;"
-| colspan="2"  | '''NOTICE TO READER''': This is an <u>information page only</u>.  To read the standards applicable to a particular Waterproofing or Water-shedding System, refer to the actual '''''RoofStar Guarantee Standards''''' located in [http://rpm.rcabc.org/index.php?title=Division_D:_Waterproofing_Systems_(Roofs)  '''Division D: Waterproofing Systems (Roofs)'''], [http://rpm.rcabc.org/index.php?title=Division_E:_Water-shedding_Systems '''Division E: Water-shedding Systems'''] or [http://rpm.rcabc.org/index.php?title=Division_F:_Grade-level_Waterproofing '''Division F: Grade-level Waterproofing'''].
+| colspan="2"  | '''NOTICE TO READER''': This is an <u>information page only</u>.  To read the standards applicable to a particular Waterproofing or Water-shedding System, refer to the actual Standard located in [[Division B | '''Division B''']].
 |}
 === General ===
 Roof surfacing materials are required to protect bituminous roof membranes from direct sunlight (ultraviolet rays). This includes bituminous, modified bituminous, and built-up roof membranes. In addition, the top ply or felt in a BUR must be protected from weather exposure to prevent &#8220;wicking&#8221; of moisture into the system. The surfacing material can also provide fire resistance, reflectivity or impact resistance. Basically, there are three surfacing options:

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 The possible disadvantages or precautions involved in the use of mineral surfaced roofing include:
 * higher initial cost
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 | colspan="2"  | '''NOTICE TO READER''': This is an <u>information page only</u>.  To read the standards applicable to a particular Waterproofing or Water-shedding System, refer to the actual '''''RoofStar Guarantee Standards''''' located in [http://rpm.rcabc.org/index.php?title=Division_D:_Waterproofing_Systems_(Roofs)  '''Division D: Waterproofing Systems (Roofs)'''], [http://rpm.rcabc.org/index.php?title=Division_E:_Water-shedding_Systems '''Division E: Water-shedding Systems'''] or [http://rpm.rcabc.org/index.php?title=Division_F:_Grade-level_Waterproofing '''Division F: Grade-level Waterproofing'''].

← Older revision		Revision as of 20:26, 26 July 2021
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		+	{\| class="wikitable" \| style="color: black; background-color: #ffffcc; width: 100%;"
		+	\| colspan="2" \| '''NOTICE TO READER''': This is an <u>information page only</u>. To read the standards applicable to a particular Waterproofing or Water-shedding System, refer to the actual '''''RoofStar Guarantee Standards''''' located in [http://rpm.rcabc.org/index.php?title=Division_D:_Waterproofing_Systems_(Roofs) '''Division D: Waterproofing Systems (Roofs)'''], [http://rpm.rcabc.org/index.php?title=Division_E:_Water-shedding_Systems '''Division E: Water-shedding Systems'''] or [http://rpm.rcabc.org/index.php?title=Division_F:_Grade-level_Waterproofing '''Division F: Grade-level Waterproofing'''].
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	=== General ===		=== General ===

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