Template:All systems - ROOF DECKS - Revision history

James Klassen: /* Wood Board Decks */

2019-01-15T15:18:02Z

‎Wood Board Decks

James Klassen: /* Wood Board Decks */

2019-01-15T15:16:59Z

‎Wood Board Decks

James Klassen at 23:01, 9 November 2018

2018-11-09T23:01:10Z

James Klassen: /* Non-veneer Wood Decks */

2017-12-14T18:43:17Z

‎Non-veneer Wood Decks

James Klassen: /* Non-veneer Wood Decks */

2017-12-14T18:40:50Z

‎Non-veneer Wood Decks

James Klassen: /* Concrete Decks */

2017-07-11T15:31:38Z

‎Concrete Decks

James Klassen: /* Special Circumstances: Electrical Conduit */

2017-07-10T21:21:06Z

‎Special Circumstances: Electrical Conduit

James Klassen: /* Wood Decks */

2017-04-27T21:31:02Z

‎Wood Decks

James Klassen: /* Roof Divider / Control Joints */

2017-02-21T16:22:37Z

‎Roof Divider / Control Joints

James Klassen: /* Wood Decks */

2017-02-21T16:04:48Z

‎Wood Decks

@@ Line 30: / Line 30: @@
 * when rigid insulation is over the deck, properly sized and installed H-clips must be used on the unsupported edges.
-===== Wood Board Decks =====
+===== '''Wood Board Decks''' =====
 <p class="reference">Wood board decks include tongue-and-groove, shiplapped, or splined boards or planks usually ranging from 19 mm to 89 mm (nominal 1" to 4") thickness.  Also 38 mm (nominal 2") by various width boards, placed on end, can be spiked together to form a &#8220;mill deck&#8221;. The thickness of the boards is determined by the anticipated loads and spacing of roof joists or trusses (consult Building Code).</p>

@@ Line 30: / Line 30: @@
 * when rigid insulation is over the deck, properly sized and installed H-clips must be used on the unsupported edges.
-===== '''Wood Board Decks''' =====
+===== Wood Board Decks =====
 <p class="reference">Wood board decks include tongue-and-groove, shiplapped, or splined boards or planks usually ranging from 19 mm to 89 mm (nominal 1" to 4") thickness.  Also 38 mm (nominal 2") by various width boards, placed on end, can be spiked together to form a &#8220;mill deck&#8221;. The thickness of the boards is determined by the anticipated loads and spacing of roof joists or trusses (consult Building Code).</p>

@@ Line 89: / Line 89: @@
 <p class="reference">Poured gypsum concrete roof decks consist of a mixture of gypsum concrete, wood fibres or mineral aggregate, and water. The mixture is poured into formboards that contain welded or woven galvanized wire fabric. The formboards are left in place and may provide the finished interior surface.</p>
 ==== Steel Decks ====
@@ Line 108: / Line 106: @@
 <p class="principles">'''NOTE''':  The above recommendation applies to most buildings. However, in highly corrosive or chemical atmospheres, special care in specifying protective finishes should be taken, and individual deck manufacturers should be contacted.</p>
 === Roof Expansion Joints ===
@@ Line 146: / Line 143: @@
 For more about this topic, see the published '''Safety Bulletin''' in the November 10, 2015 [http://www.rcabc.org/technical/technical-updates/ '''Technical Update'''].
 <div id="EPDMWIND"></div>
 <div id="TPOWIND"></div>
 <div id="EPDM4"></div>
 <div id="TPO4"></div>

@@ Line 58: / Line 58: @@
 <p class="reference">Non-veneer panels are identified as waferboard or oriented strand board (OSB) panels, as opposed to plywood or veneered panels.</p>
-Non-veneer (O.S.B. or waferboard) panels are acceptable decks on low-slope roofing applications when an approved separation sheet or rigid insulation is mechanically attached before fully adhered roofing is applied.
+Non-veneer (O.S.B. or waferboard) panels are acceptable decks on low-slope roofing applications when an approved separation sheet or rigid insulation is mechanically attached before fully adhered roofing membrane is applied.
 ==== Concrete Decks ====

@@ Line 58: / Line 58: @@
 <p class="reference">Non-veneer panels are identified as waferboard or oriented strand board (OSB) panels, as opposed to plywood or veneered panels.</p>
-Non-veneer (O.S.B. or waferboard) panels are acceptable decks on low-slope roofing applications when an approved separation sheet or rigid insulation is mechanically attached before roofing is applied.
+Non-veneer (O.S.B. or waferboard) panels are acceptable decks on low-slope roofing applications when an approved separation sheet or rigid insulation is mechanically attached before fully adhered roofing is applied.
 ==== Concrete Decks ====

@@ Line 86: / Line 86: @@
 <p class="reference">Pre-stressed concrete roof decks consist of concrete (usually pre-cast panels) that is pre-stressed using integral steel tendon reinforcement. The unit is compressed to counteract flexural tensile stresses which usually result in a cambered unit (a slight curve that results in the centre of the unit being higher than the supporting ends). The camber will usually flatten once the structure is loaded.</p>
-<p class="reference">Lightweight insulating concrete roof decks and fills consist of concrete mixtures that have vermiculite or perlite as insulating aggregates, or they may also be produced by mixing pre-generated foam with portland cement and water. This type of deck is usually designed for application over steel decks, corrugated metal forms, or bulb-tee or formboard systems. The concrete mixture is placed and screeded on site. Usually these mixes use a very high water / cement ratio and may require a lengthy cure time and a vented base sheet because of high moisture content. Vented base sheets provide a path for moisture vapour to vent to an appropriate point where the vapour may be released.</p>
+<p class="reference">Lightweight insulating concrete roof decks and fills consist of concrete mixtures that have vermiculite or perlite as insulating aggregates, or they may also be produced by mixing pre-generated foam with Portland cement and water. This type of deck is usually designed for application over steel decks, corrugated metal forms, or bulb-tee or formboard systems. The concrete mixture is placed and screeded on site. Usually these mixes use a very high water / cement ratio and may require a lengthy cure time and a vented base sheet because of high moisture content. Vented base sheets provide a path for moisture vapour to vent to an appropriate point where the vapour may be released.</p>
 <p class="reference">Poured gypsum concrete roof decks consist of a mixture of gypsum concrete, wood fibres or mineral aggregate, and water. The mixture is poured into formboards that contain welded or woven galvanized wire fabric. The formboards are left in place and may provide the finished interior surface.</p>

@@ Line 140: / Line 140: @@
 ===Special Circumstances: Electrical Conduit===
-<span class="principles">Conduit, EMT, cable and/or piping applied on the top of roof deck surfaces shall not be acceptable on new construction projects.</span>
+Conduit, EMT, cable and/or piping applied on the top of roof deck surfaces shall not be acceptable on new construction projects.
 If conduit is present on decks in re-roofing projects, the deck must be made smooth and even to the satisfaction of the accepted roof inspection firm. The upper layer of insulation must cover the conduit, EMT, cable and/or piping.  Detailed as-built drawings should be made to prevent conduit damage and safety risks to roofers, should the roof require replacement at a future date.

@@ Line 25: / Line 25: @@
 <p class="principles">All types of wood decks should be roofed promptly after installation.</p>
-Differential edge movements or deflection in excess of1/360 of the span in plywood or non-veneer decks in low slope roofing must be prevented by:
+Differential edge movements or deflection in excess of 1/360 of the span in plywood or non-veneer decks in low slope roofing must be prevented by:
 * solid blocking under non-supported edges, and /or
 * use of tongue-and-groove plywood with non-grooved edges supported by joists or solid blocking, and / or

@@ Line 130: / Line 130: @@
 <p class="reference">Roof dividers (sometimes referred to as control joints or area dividers) are built on-site. They are designed to help control thermal expansion and contraction stresses in the roof system where no structural expansion joint has been provided in the building design. Roof dividers are especially useful for controlling stress concentration in the membrane, and should be considered (and may be required) on all fully-adhered roof membrane systems.</p>
-<span class="reference">A roof divider is usually designed as two raised wood members attached to a wood base-plate that is securely anchored to the roof deck and then properly flashed with membrane and metal.</span>.  Roof dividers should divide the roof into approximately equal, regularly-shaped areas. Ideally, roof dividers should be located at the high points of the roof, with drainage away from the divider on both sides, but DRAINAGE MUST NOT BE IMPEDED BY THE ROOF DIVIDER.
+<span class="reference">A roof divider is usually designed as two raised wood members attached to a wood base-plate that is securely anchored to the roof deck and then properly flashed with membrane and metal.</span>  Roof dividers should divide the roof into approximately equal, regularly-shaped areas. Ideally, roof dividers should be located at the high points of the roof, with drainage away from the divider on both sides, but DRAINAGE MUST NOT BE IMPEDED BY THE ROOF DIVIDER.
 '''''RoofStar Guarantee Standards''''' for a '''''RoofStar 5-Year Roofing Guarantee''''' or '''''RoofStar 10-Year Roofing Guarantee''''' for built-up roof membrane requires roof dividers / control joints &#8220;to divide roofs into areas approximately 45 m x 45 m (150' x 150'), at changes of deck material and decking direction, at re-entrant corners, and at junctions or additions to existing structure.

@@ Line 21: / Line 21: @@
 Wood is a common construction material that has been used for many years because of its economy, ease of fabrication, lighter construction, and ready availability. Acceptable wood roof decks may include wood board decks, plywood decks, and, subject to restrictions, non-veneered wood decks (oriented strand board, waferboard, etc.). <span class="principles">All types of wood decks should be roofed promptly after installation.</span>
-All wood decks shall be properly fastened to BC Building Code requirements. With the exception of standard insulated roof systems, all knots or cracks shall be covered with metal prior to acceptance of deck surface.This work is to be done by others.  <span class="principles">Non-veneer (O.S.B. or wafer board) panels are acceptable sheathing for decks with low-slope roofing applications, provided the roofing membrane is not fully adhered directly to the panels.</span>  The minimum plywood or non-veneer (O.S.B or wafer board) deck thickness for low-slope roofing (i.e., membrane roofing) shall be a minimum 12.7 mm (½") and as indicated in the applicable Building Code.
+All wood decks shall be properly fastened to BC Building Code requirements. With the exception of standard insulated roof systems, all knots or cracks shall be covered with metal prior to acceptance of deck surface.  This work is to be done by others.  <span class="principles">Non-veneer (O.S.B. or wafer board) panels are acceptable sheathing for decks with low-slope roofing applications, provided the roofing membrane is not fully adhered directly to the panels.</span>  The minimum plywood or non-veneer (O.S.B or wafer board) deck thickness for low-slope roofing (i.e., membrane roofing) shall be a minimum 12.7 mm (½") and as indicated in the applicable Building Code.
 <p class="principles">All types of wood decks should be roofed promptly after installation.</p>