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| | + | <big><big>Division B - Standards</big></big> |
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| | <big><big><big><big><big>Standard for Built-up (BUR) Roof Systems</big></big></big></big></big> | | <big><big><big><big><big>Standard for Built-up (BUR) Roof Systems</big></big></big></big></big> |
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| − | {{Template:RPM Standard Header Pane (Primary)}}
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| − | <div id="BURGENERAL"></div>
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| − | == GENERAL REQUIREMENTS ==
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| − | '''NOTE''': See also [[Low-slope Membranes|'''Low-slope Membranes''']] for additional application notes and cautions.
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| − | === Roof Slope ===
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| − | All new construction roofs must have positive slope to drain..
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| − |
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| − | <span class="recommended">In re-roof projects, crickets and saddles should be provided to assist drainage</span>.
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| − | On all reroofs without positive slope to drain and all protected or modified protected membrane roofing, only non-organic felts or membranes may be used. A minimum slope of 1:50 (l/4" in 12") is strongly recommended (NOTE: positive slope to drain is required for a '''''RoofStar 5-Year Roofing Guarantee''''' or '''''RoofStar 10-Year Roofing Guarantee''''' for new construction), but <b>positive slope</b> to drain is an absolute requirement for organic felts. Positive slope to drain is attained when no standing water remains on the deck within a reasonable amount of time after rainfall stops during days with conditions that permit evaporation. <span class="principles">Drain wells that are designed to collect water and provide a flat surface for the installation of roof drains do not require slope. Therefore standing water may remain in drain wells for a longer period after a rainfall stops.</span>
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| − |
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| − | <span class="principles">Slope can be provided by sloping the deck, or using tapered insulation boards of insulating fill (insulating fill is rarely used in B.C.).</span>
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| − |
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| − | <span class="principles">Crickets and saddles should be employed between drains where the design slope of the roof is less than 1:50 (1/4" in 12"), where the roof deck is uneven and ponding may occur, or simply to assist the movement of water to drains.</span>
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| − | ===Quality Control===
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| − | ====Hot-Mopped Modified Bituminous Membranes====
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| − | <p class="reference">As with all flexible membranes, the quality of the installation is critical to the performance of bituminous and modified bituminous membranes. Although some of the application techniques for these membranes can be similar to those employed in built-up roofing, and the materials can be “familiar”, the differences are critical. It is important that the specifications, details, and installation techniques all conform to the membrane manufacturer's requirements.</p>
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| − | One of the major concerns when applying modified bituminous 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°C (+400°F) as required by '''''RoofStar Guarantee Standards''''' (see also [[RoofStar Guarantee Standards for BUR Roof Systems#Bitumen (Asphalt) Requirements| '''9.2.1 Bitumen (Asphalt) Requirements''']]). <span class="principles">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 (read more in [[BUR Materials|'''Built-up Roofing (BUR) Materials''']]).</span> <span class="recommended">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.</span> <span class="reference">Some manufacturers may require "torched" membrane flashing 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.</span>
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| − |
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| − | <p class="reference">The design authority should recognize that the appearance of wrinkling and ridging in modified bitumen cap sheets applied in hot asphalt <u>may</u> be generic to certain manufacturers of this system, and particularly when attempted in cooler temperatures. Although some manufacturers' literature suggests application may take place in temperatures as low as -25°C (-13°F), there are many subsequent limitations, the variables of which may result occasionally in severe wrinkling or ridging of the cap sheet as well as potentially poor adhesion.</p>
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| − |
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| − | <p class="recommended">The '''''RoofStar Guarantee Program''''' ''recommends'' that, in order to minimize the potential for wrinkling and ridging, the use of <b>mopped</b> cap sheets <b>not be considered</b> or specified when ambient temperatures (including wind chill) may go below +5°C (+41°F).</p>
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| − |
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| − | <span class="reference">Many factors affect the behaviour of the finished prefabricated sheets including:</span>
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| − | :* <span class="reference">The quality of the binder (waterproofing agent).</span>
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| − | :* <span class="reference">The choice of carrier including suppliers of fibreglass, polyester, or a combination of the two.</span>
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| − | :* <span class="reference">Saturation of the carrier.</span>
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| − | :* <span class="reference">Engineering of the sheet (composition and placement of the components within the sheet).</span>
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| − | :* <span class="reference">Quality control of the manufacturer.</span>
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| − | :* <span class="reference">Expertise of the manufacturer's personnel (including field representation).</span>
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| − | :* <span class="reference">Recommendations as to what is required for a completed system and the recommended application procedure.</span>
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| − | :* <span class="reference">Installation in the field by a <b>competent</b> contractor.</span>
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| − | :* <span class="reference">The designer's role in choosing the product(s) which satisfy each previous item described.</span>
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| − |
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| − | <p class="reference">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.</p>
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| − |
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| − | <span class="recommended">The '''''RoofStar Guarantee Program''''' <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.</span>
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| − |
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| − | <p class="reference">NOTE: 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 [[RoofStar Guarantee Standards for SBS Roof Systems#SBSMECHAN|'''8.3.4 "Mechanically Attached" membranes ''']] for requirements and slope limitations.</p>
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| − |
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| − | <p class="reference">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.</p>
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| − | ====Work Sequencing====
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| − | Roofing is to be completed from deck to gravel coat in one operation. An adequate asphalt glaze coat is acceptable temporary surfacing on a <b>completed</b> membrane assembly. Adequate is defined as enough asphalt to prevent moisture absorption in the felts.
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| − | Note: All layers of felt must be applied the same day.
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| − | === Re-covering or Retrofitting ===
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| − | Retrofitting over existing membrane is permitted only in specific circumstances and only when approved in writing by the '''''RoofStar Guarantee Program''''' (Technical Manager) and the membrane manufacturer.
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| − | For '''''RoofStar Guarantee Standards'''''' pertaining to wind uplift resistance, refer to [[RoofStar Guarantee Standards for BUR Roof Systems#BURWIND|'''Wind Uplift Design and CSA A123.21''']] below.
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| − | === Tying Into Existing Roofing ===
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| − | Where a new roof is tied-in to an existing roof, the two areas must be isolated and separated by a curb joint properly attached to the structure and properly flashed. If job conditions do not allow for a curb joint, written permission must be obtained from the '''''RoofStar Guarantee Program''''' (Technical Manager) to eliminate curb joints. Where a curb joint is eliminated with consent from the '''''RoofStar Guarantee Program''''', a positive water cut-off must be installed to the deck to isolate the existing roof from the new roof.
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| − | <hr>
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| − | <div id="BURDECKS"></div>
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| − | ==ROOF DECKS==
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| − | {| class="wikitable"
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| − | | '''NOTE''': See more information on [[Roof Decks|'''Roof Decks''']] in Section B: Essential Elements.
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| − | |}
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| − | {{BUR - ROOF DECKS}}
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| − | <hr>
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| − | ==WIND UPLIFT DESIGN and CSA A123.21==
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| − | the '''CSA A123.21''' Standard Test Method for Wind Uplift Resistance does not always apply to BUR Roof Systems; traditional felt and bitumen assemblies have not been included in the test methods and tested assemblies subject to the CSA Standard. Consult the requirements when designing, specifying or constructing a BUR Roof System using SBS Modified Bituminous membranes. For other '''''RoofStar Guarantee Standards''''' applicable to wind uplift resistance, see below under [[RoofStar Guarantee Standards for BUR Roof Systems#BURINSULATION |'''INSULATION''']].
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| − | {{Template:Wind Uplift Design and CSA A123.21}}
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| − | <hr>
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| − | <div id="BURMATERIALS"></div>
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| − | ==MATERIALS==
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| − | {| class="wikitable"
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| − | | '''NOTE''': Click [[Materials by Product Type|'''here''']] to view all the Materials accepted for use in the '''''RoofStar Guarantee Program'''''.
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| − | |}
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| − | <span class="principles">All BUR roofing membranes <b>should</b> be constructed of products supplied by the same manufacturer.</span>
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| − | Acceptable base sheets are composed of either a fibreglass or organic felt core that has been saturated <b>and coated</b> on both sides with bitumen. Fibreglass felt asphalt-coated base sheets must be used in conjunction with glass-ply felt (Type IV and VI) and polyester felt built-up roofs.
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| − | {{All Systems - MATERIALS|MATERIALS}}
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| − | For more information about BUR materials, see [http://rpm.rcabc.org/index.php?title=BUR_Materials '''BUR Materials'''] in the '''Essential Elements''' section of this '''Manual.'''
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| − | <hr>
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| − | <div id="BURSUBSTRATES"></div>
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| − | ==SUBSTRATES: Deck Overlay Board and Wall Sheathing==
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| − | {| class="wikitable"
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| − | | '''NOTE''': See more information on [[Roof Deck Overlay|'''Roof Deck Overlay Boards''']] in Section B: Essential Elements.
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| − | |}
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| − | {{Template: Deck Overlay - SBS}}
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| − | <div id="BURWALLSUB"></div>
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| − | === Application: Wall Sheathing===
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| − | ====Walls Supporting Roof Deck====
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| − | In combustible construction, or where permitted by the Building Code in non-combustible construction, all concrete or masonry parapets or walls which do not provide a smooth, clean, dry surface for membrane adhesion or are to be applied with oxidized asphalt as the adhesive must be sheathed with a minimum 15.9 mm (5/8") treated plywood, or 9.5 mm (3/8") reinforced cement board that conforms to ASTM C1325-04 mechanically attached to the wall. The plywood is to extend either a minimum of 200 mm (8") above membrane surfacing, to the bottom of the reglet, or, if required by the type of membrane, to the full height of the parapet.
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| − | ====Non-Supporting Walls====
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| − | Where permitted by the Building Code, all concrete or masonry parapets or walls to which roofing is to be applied must be sheathed with minimum 15.9 mm (5/8") plywood or 9.5 mm (3/8") reinforced cement board that conforms to ASTM C1325-04 solidly attached to the roof deck with adequately treated blocking. Compressible insulation is to be installed between the sheathing and the wall. Coping and / or counter flashing is to be installed. See [[SBS Details:D1.7.4 Parapets & Copings (Low Parapet - Unsupported by Wall)|'''Detail: D1.7.4''']] for an illustration. The plywood is to extend either a minimum of 200 mm (8") above membrane surfacing or, if required by the type of membrane, to the full height of the parapet or wall. This item is supplied and installed by others unless specified otherwise.
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| − | Gypsum boards on vertical surfaces must be RoofStar-accepted overlay boards with water resistant properties. On steel framed walls accepted gypsum overlay boards with a minimum thickness of 12mm (1/2") or fibre-mat reinforced cement boards with a minimum thickness of 9.5 mm (3/8") that conform to ASTM C1325-04 are an acceptable vertical substrate to receive roofing.
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| − | The installation of roof membrane to the surface must be as per the membrane manufacturer's requirements for that substrate.
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| − | <hr>
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| − | <div id="BURVAPOUR"></div>
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| − |
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| − | =={{hilite | AIR & VAPOUR BARRIERS || 2018-June-29 }}==
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| − | {| class="wikitable"
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| − | | '''NOTE''': See more information on [[Air and Vapour Control|'''Air and Vapour Control''']] in Section B: Essential Elements.
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| − | |}
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| − | {{All Systems - VAPOUR RETARDERS}}
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| − | <hr>
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| − | <div id="BURINSULATION"></div>
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| − | ==INSULATION==
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| − | {| class="wikitable"
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| − | | '''NOTE''': See more information on [[Insulating the Roof|'''Roof Insulation''']] in Section B: Essential Elements.
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| − | |}
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| − | {{All systems - INSULATION}}
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| − | <hr>
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| − | <div id="BURINSULATIONOVERLAY"></div>
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| − | ==INSULATION OVERLAY BOARD==
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| − | {| class="wikitable"
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| − | | '''NOTE''': See more information on [[Insulation Joints and Overlay|'''Insulation Overlay Boards''']] ''Essential Elements''.
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| − | |}
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| − | {{BUR - INSULATION OVERLAY BOARD}}
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| − | <hr>
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| − | <div id="BURBASE"></div>
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| − | <div id="BURMEMBRANES"></div>
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| − | ==MEMBRANES==
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| − | {| class="wikitable"
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| − | |-
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| − | | '''NOTE''': See more information on [[Low-slope Membranes|'''Low-slope Membranes''']] ''Essential Elements''.
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| − | |}
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| − | {{Template:BUR Membranes}}
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| − | <hr>
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| − | <div id="BURGARDEN"></div>
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| − | == VEGETATED ROOF ASSEMBLIES, {{hilite | PLANTERS & OCCUPIED SPACES || 2018-January-25 }} ==
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| − | {{ROOFTOP EQUIPMENT & WALKWAYS (BUR)}}
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| − | <div id="BURSTRIPPING"></div>
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| − | <div id="BURWOODBLOCKING"></div>
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| − | == PERIMETER & DETAIL FLASHING: Membranes ==
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| − | {{Template:PERIMETER FLASHINGS - MEMBRANES (BUR)}}
| + | This Standard has been temporarily removed for editing |
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| | <hr> | | <hr> |
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| − | <div id="BURDRAINS"></div>
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| − | == ROOF PENETRATIONS and DRAINS ==
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| − | {{Template:ROOF PENETRATIONS and DRAINS (BUR)}}
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| − | <hr>
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| − | <div id="BURMETAL"></div>
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| − | == PERIMETER FLASHING: Metal ==
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| − | {{PERIMETER FLASHINGS - METAL (BUR)}}
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| − | <hr>
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| − | <div id=BUROTHER></div>
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| − | == OTHER DETAILS ==
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| − | TBA
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| − | <hr>
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| | [[BUR Roof Systems|<i class="fa fa-chevron-circle-left" ></i> ''BUR Roof Systems'']] | | [[BUR Roof Systems|<i class="fa fa-chevron-circle-left" ></i> ''BUR Roof Systems'']] |
