Waterproofing Materials - Revision history

James Klassen: /* APPLICATION CAUTION */

2021-09-09T15:57:57Z

‎APPLICATION CAUTION

James Klassen: /* APPLICATION */

2021-09-09T15:55:50Z

‎APPLICATION

James Klassen at 15:47, 9 September 2021

2021-09-09T15:47:26Z

James Klassen at 21:20, 3 September 2021

2021-09-03T21:20:10Z

James Klassen at 21:10, 3 September 2021

2021-09-03T21:10:46Z

James Klassen at 20:27, 26 July 2021

2021-07-26T20:27:54Z

James Klassen at 21:34, 22 September 2020

2020-09-22T21:34:16Z

James Klassen at 21:40, 17 June 2020

2020-06-17T21:40:30Z

James Klassen at 16:40, 20 February 2019

2019-02-20T16:40:08Z

James Klassen: James Klassen moved page Waterproofing System Materials to Waterproofing Materials

2019-02-20T16:33:40Z

James Klassen moved page Waterproofing System Materials to Waterproofing Materials

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 # The wrinkles or ridges are usually considered an aesthetic problem only, but may occasionally result in fishmouthing and intermittent bonding of the cap sheet.  Both of these deficiencies affect the performance of the membrane.
 # the '''''RoofStar Guarantee Program''''' recommends the use of <b>torch applied</b> thermofusible cap sheets in 2-ply modified bitumen systems <b>in all cases</b>, but particularly if roofing must be carried out in cool or cold weather.  Appropriate safety precautions regarding torching must be addressed.
-# Occasionally some mopped systems, particularly with heavy cap sheets, have exhibited a propensity for membrane slippage, frequently on insulated systems where there is a combination of slope, heavy inter-ply mopping and lack of mechanical fastening (back nailing) of sheets.  (See the [[RoofStar_Guarantee_Standards_for_SBS_Roof_Systems#SBSINSULATION|'''INSULATION''']] section of [[SBS Roof Systems|'''SBS Roof Systems''']] for mechanical fastening requirements and slope limitations).
+# Occasionally some mopped systems, particularly with heavy cap sheets, have exhibited a propensity for membrane slippage, frequently on insulated systems where there is a combination of slope, heavy inter-ply mopping and lack of mechanical fastening (back nailing) of sheets.  See Part 7 in the [[SBS_Roof_Systems_Standard | '''Standard for SBS-modified Bitumen Membrane Systems''']].
 # It is also common for <b>mopped</b> systems to exhibit some asphalt bleed-out at the seams.  Minimal or reasonable bleed-out is to be expected and is an aesthetic problem which may be minimized by the embedment of matching granules.  Bleed-out which oxidizes and alligators with time does not normally affect the waterproofing efficiency of the roof.

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 One of the major concerns when applying these membranes with hot asphalt is to ensure the asphalt remains hot enough to fuse with the binder of the membrane.  The asphalt temperature must conform to the membrane manufacturer's minimum application temperature and minimum +205&#176;C (+400&#176;F) as required by '''''RoofStar Guarantee Standards'''''.  Asphalt should not be mopped more than 1 m (3') preceding the roll as it has been demonstrated that the temperature of mopped asphalt drops sharply once mopped out (see [http://rpm.rcabc.org/index.php?title=BUR_Materials#BURAsphalt '''roofing asphalt''']).  In addition to asphalt temperature, particular attention should be paid to slope limitations, fastening requirements, type of asphalt, the amount of asphalt used, and membrane flashing requirements when using hot asphalt.  Some manufacturers may require &#8220;torched&#8221; membrane flashings to ensure a proper bond and prevent problems with slippage or asphalt running down the vertical and collecting at the cant.  Slippage can also be a problem when an excessive amount of asphalt is used.  Only enough asphalt to meet the adhesive requirements is needed.  The mopping asphalt has a lower softening point than the bitumen in the membrane and may result in asphalt running and slippage problems.
-The major concern when installing &#8220;torch-on&#8221; membranes is an obvious one:  SAFETY.  This is discussed in detail in [http://rpm.rcabc.org/index.php?title=SBS_Special_Applications '''SBS Special Applications'''].  In addition to safety, it is essential that the membrane be fully and evenly bonded to the substrate.  As the roll is installed, the roofer must ensure the full width of the roll is melted and the preceding roll's side lap is preheated.  A small &#8220;wave&#8221; or &#8220;bead&#8221; of melted bitumen in front of the roll usually indicates sufficient heat.  Special attention to seams is required.
+The major concern when installing &#8220;torch-on&#8221; membranes is an obvious one:  SAFETY.  This is discussed in detail in [http://rpm.rcabc.org/index.php?title=SBS_Modified_Bitumen_Application_Guides_and_Notes '''SBS Special Applications'''].  In addition to safety, it is essential that the membrane be fully and evenly bonded to the substrate.  As the roll is installed, the roofer must ensure the full width of the roll is melted and the preceding roll's side lap is preheated.  A small &#8220;wave&#8221; or &#8220;bead&#8221; of melted bitumen in front of the roll usually indicates sufficient heat.  Special attention to seams is required.
 The polyester fabric used as reinforcing in many thermofusible (&#8220;torch on&#8221;) membranes is subject to dimensional changes at high temperatures.  Care must be exercised by the applicator not to over-torch or over-heat membranes.  Membranes must be designed and manufactured specifically for torch applications.

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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'''].
+| 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''']].
 |}

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 ===Bituminous and Modified Bituminous===
 Bituminous and modified bituminous membrane systems have the benefit of offering the physical properties of a flexible membrane while retaining the practical advantages of bituminous materials. Roofers tend to have a certain &#8220;familiarity&#8221; with the product and they can be used in conjunction with some traditional products and methods. This may prove especially advantageous in re-roofing over surfaces contaminated with bitumen.
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 ===Single-ply Thermoset and Thermoplastic Membranes===
 Due to the complexities involved in non-bituminous flexible membranes, &#8220;generic&#8221; application specifications and details are not possible. This section of the manual contains both an overview of the products, their composition, usage, and design considerations, and the accepted membrane manufacturer's written submissions. In all cases, the membrane manufacturer should be contacted for further recommendations and details.
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 ====Thermoset (Elastomeric)====
 :Thermoset flexible membrane systems are synthetic materials in which polymers chemically and irreversibly cross-link. This process is known as &#8220;curing&#8221; or &#8220;vulcanizing&#8221;. They may be manufactured in cured or uncured form. Once cured, the material cannot be bonded to itself except by using an adhesive and / or seaming tape. (See Manufacturer application standards).
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 ====Thermoplastic (Plastomeric)====
 :Thermoplastic flexible membrane systems are synthetic materials in which cross-linking of the polymers does not occur. The membrane can be welded together by the use of solvents or heat. This process is repetitive and new welds may be formed at a later time. The strength of these welds often surpasses that of the base membrane.
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 PVC membranes should be applied in conformance with  [http://rpm.rcabc.org/index.php?title=RoofStar_Guarantee_Standards_for_TPO/PVC_Roof_Systems '''RoofStar Guarantee Standards for TPO/PVC Roof Systems'''], with consideration given to CGSB 37-GP-55M 1979, &#8220;Application of Sheet Applied Flexible Polyvinyl Chloride Roof Membrane&#8221; and the membrane manufacturer&#8217;s printed instructions.
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 ===General===

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← Older revision	Revision as of 16:33, 20 February 2019
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