SBS Introduction - Revision history

James Klassen: /* APP MODIFIED BITUMEN MEMBRANES */

2017-07-17T21:46:52Z

‎APP MODIFIED BITUMEN MEMBRANES

James Klassen at 20:52, 29 September 2016

2016-09-29T20:52:20Z

James Klassen at 17:54, 29 September 2016

2016-09-29T17:54:09Z

James Klassen: /* MODIFIED BITUMEN MEMBRANES IN HOT MOPPED ASPHALT */

2016-08-18T17:50:45Z

‎MODIFIED BITUMEN MEMBRANES IN HOT MOPPED ASPHALT

James Klassen: /* Performance */

2016-08-18T17:45:23Z

‎Performance

James Klassen: /* Introduction */

2016-08-18T17:39:13Z

‎Introduction

Show changes

James Klassen at 20:16, 27 July 2016

2016-07-27T20:16:23Z

James Klassen: /* Introduction */

2016-07-20T15:47:53Z

‎Introduction

James Klassen at 15:50, 11 January 2016

2016-01-11T15:50:57Z

James Klassen at 15:42, 11 January 2016

2016-01-11T15:42:57Z

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-[[SBS Roof Systems|<i class="fa fa-chevron-circle-left" ></i> ''SBS Roof Systems'']]
+[[SBS Modified Bitumen Roof Systems|<i class="fa fa-chevron-circle-left" ></i> ''SBS Modified Bitumen Roof Systems'']]
 [[SBS Definition and Terms|<i class="fa fa-chevron-circle-right" ></i> ''Definition and Terms'']]
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 == Introduction ==

← Older revision		Revision as of 17:54, 29 September 2016
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	== Introduction ==		== Introduction ==

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	[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right" ></i> ''Definition and Terms'']]		[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right" ></i> ''Definition and Terms'']]
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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.
 # RGC <b>recommends</b> 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 Section 2.1.3, C5.3 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 [http://{{SERVERNAME}}/index.php?title=RoofStar_Guarantee_Standards_for_SBS_Roof_Systems#SBSINSULFASTEN '''SBS Roof Systems - 6.3.3 Mechanical Fastening'''] for mechanical fastening requirements and slope limitations; see similar requirements for '''EPDM''' and '''TPO/PVC Roof 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.

← Older revision		Revision as of 17:45, 18 August 2016
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	The design of a roof membrane system is contingent upon many factors and is not solely a function of design temperatures. Consult the membrane manufacturer for assistance with design considerations and membrane selection.		The design of a roof membrane system is contingent upon many factors and is not solely a function of design temperatures. Consult the membrane manufacturer for assistance with design considerations and membrane selection.
		+
		+	{\| class="wikitable"
		+	\|-
		+	! '''<big>Ridging and Wrinkling of Modified Bitumen Membranes'''</big>
		+	\|-
		+	\| '''Reprinted of CRCA Technical Bulletin, Volume 43, published October 1995'''
		+
		+	Can roofs be “perfectly” constructed‌ Under most circumstances, the answer to that question would be ‘No’. Minor aesthetic imperfections, that have no bearing on performance, will always develop due to the materials used and the conditions under which they are installed.
		+
		+	Modified bitumen membranes, with their relatively thin protective surfacing (primarily ceramic granules or metal foils), can be particularly susceptible to the occurrence of these blemishes. Unlike traditional built-up roofs, these membranes are not “hidden from view” by a heavy top pour of asphalt and gravel. The reflective properties of their protective surfacing will allow many minor anomalies, such as deck or insulation unevenness, to readily telescope through to the roof surface. Over time, due to natural weathering and aging, these aesthetic imperfections will become increasingly visible. There are, however, distinct benefits to this aspect of modified bitumen membranes. Some manufacturing defects, such as poor surfacing embedment and uneven or insufficient backside coating, may be detected through an inspection of the rolls prior to installation. Serious errors in application will be apparent almost immediately allowing timely remedial action to take place.
		+
		+	The decision to repair a modified bitumen roof should, as with every type of roofing system, be made only after careful thought and should be based primarily on performance consequences. Open seams, fishmouths at laps, large unbonded areas of the membrane and areas where overheating has resulted in distortion to the reinforcing should be corrected as soon as possible. Trivial anomalies, on the other hand, such as minor wrinkling and ridging are to be expected as a function of the physical characteristics of these materials and their required application methods. Patching a minor blister or a small wrinkle because of visual impact alone is not justified and, in most cases, the repairs will look far worse than the blemish they were intended to correct.
		+
		+	As contractors have become more experienced with modified bitumen membrane installation, application techniques have evolved that have proven to reduce the occurrence and severity of these “blemishes”. These techniques, however, will not eliminate these minor anomalies entirely. In addition, it should be realized that they may significantly increase the cost of a roofing project due to added labour costs and lengthened construction schedules, with only marginal benefits for the owner and no meaningful increase in performance value.
		+
		+	Modified bitumen membranes have proven to provide satisfactory performance in most regions of our country. As with any product, however, they have their limitations. One should not forget that their primary purpose is to be a barrier to moisture. Although they are available in a variety of coloured surfaces and textures, their inherent physical properties make an absolute flawless appearance impossible under most circumstances. A reasonable level of expectation is required by those who specify these membranes together with a reasonable level of care and skill in their application.
		+	\|}

	==Application==		==Application==

← Older revision		Revision as of 20:16, 27 July 2016
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−	[[SBS Roof Systems\|<i class="fa fa-chevron-circle-left ~~fa-2x~~" ></i> ''SBS Roof Systems'']]	+	[[SBS Roof Systems\|<i class="fa fa-chevron-circle-left" ></i> ''SBS Roof Systems'']]

−	[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right ~~fa-2x~~" ></i> ''Definition and Terms'']]	+	[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right" ></i> ''Definition and Terms'']]

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 Membranes are usually surface treated with a parting agent so they do not stick in the roll. Surfaces that will be hot asphalt applied are usually sanded while torch-applied surfaces use polyethylene or other thermofusible films (materials that can be bonded with heat). Exposed surfaces may be embedded with mineral granules (usually ceramic chips or slate flakes) or laminated with metal foil for ultra-violet protection. As an alternative on roofs with minimal slopes, a pour coat and gravel surfacing may be installed over some membranes, although this makes the quality of application difficult to inspect and may lead to problems with membrane slippage due to the weight of the cap sheet and surfacing.</div>
-[[SBS Roof Systems|<i class="fa fa-chevron-circle-left fa-2x" ></i> Back to ''SBS Roof Systems'']]
 [[SBS Definition and Terms|<i class="fa fa-chevron-circle-right fa-2x" ></i> ''Definition and Terms'']]

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−	[[~~Section:D. Low Slope Roofs~~\|<i class="fa fa-chevron-circle-left fa-2x" ></i> Back to ''~~Low Slope~~ Roof Systems'']]	+	[[SBS Roof Systems\|<i class="fa fa-chevron-circle-left fa-2x" ></i> Back to ''SBS Roof Systems'']]

	[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right fa-2x" ></i> ''Definition and Terms'']]		[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right fa-2x" ></i> ''Definition and Terms'']]

← Older revision		Revision as of 15:42, 11 January 2016
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−	[[Section:D. ~~Application:~~ Low Slope Roofs\|<i class="fa fa-chevron-circle-left fa-2x" ></i> Back to ''~~Application:~~ Low ~~Slopes~~'']]	+	[[Section:D. Low Slope Roofs\|<i class="fa fa-chevron-circle-left fa-2x" ></i> Back to ''Low Slope Roof Systems'']]

	[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right fa-2x" ></i> ''Definition and Terms'']]		[[SBS Definition and Terms\|<i class="fa fa-chevron-circle-right fa-2x" ></i> ''Definition and Terms'']]