Template:BUR - INSULATION OVERLAY BOARD - Revision history

James Klassen at 21:13, 14 August 2026

2026-08-14T21:13:19Z

James Klassen: /* Adhering */

2017-08-22T17:06:24Z

‎Adhering

James Klassen: /* Adhering */

2017-04-06T14:23:13Z

‎Adhering

James Klassen: /* Adhering */

2017-02-07T16:29:40Z

‎Adhering

James Klassen: /* Adhering */

2017-01-25T21:28:00Z

‎Adhering

James Klassen: /* Material Selection */

2016-11-10T22:54:06Z

‎Material Selection

James Klassen: /* Joint Taping */

2016-11-10T17:38:47Z

‎Joint Taping

James Klassen: /* Layering */

2016-11-10T17:36:06Z

‎Layering

James Klassen: /* Layering */

2016-11-10T17:28:01Z

‎Layering

James Klassen: /* Adhering */

2016-11-10T17:27:24Z

‎Adhering

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 __NOTOC__
 === General ===
 RoofStar-accepted insulation overlay boards shall be installed over all plastic foam insulations (EPS, XEPS, Polyisocyanurate) on all adhered low slope roofing systems. When heat sensitive insulations (EPS,XEPS) are used with heat welded membrane seams an accepted overlay board must be installed. Fibreboard shall not be used with flame welded seams.

@@ Line 45: / Line 45: @@
 When asphaltic membranes are adhered (using hot asphalt, cold adhesives, or when applied with a torch), {{hilite | at least one layer of || 2018-January-25 }} overlay board is required over all types of insulation.  {{hilite | The exception to this requirement is mineral wool insulation used in a single or multi-layered adhered or partially adhered insulation assembly, where the top surface of the uppermost insulation layer incorporates an impregnated bitumen surface to which an asphaltic membrane may be torch welded, mop-applied or cold-adhered. || 2018-January-25 }}
-'''Conventionally insulated roof assemblies''' are required to have a minimum 12.5mm (½") adhered approved RoofStar-accepted gypsum overlay board, and insulation boards with a minimum compressive strength of 20 psi, under the roof membrane for [[RoofStar Guarantee Standards for SBS Roof Systems#SBSEXTENSIVE|'''Extensive Vegetated Systems''']] (less than 200 mm, 8" in depth).  [[RoofStar Guarantee Standards for SBS Roof Systems#SBSINTENSIVE|'''Intensive Vegetative Roof Assemblies''']] in excess of 200 mm (8") or more in depth are not permitted over conventionally insulated roof systems.
+'''Conventionally insulated roof assemblies''' are required to have a minimum 12.5mm (½") adhered approved RoofStar-accepted gypsum overlay board, and insulation boards with a minimum compressive strength of 20 psi, under the roof membrane for [[RoofStar Guarantee Standards for SBS Roof Systems#SBSEXTENSIVE|'''Extensive Vegetated Systems''']] (less than 150 mm, 6" in depth).  [[RoofStar Guarantee Standards for SBS Roof Systems#SBSINTENSIVE|'''Intensive Vegetative Roof Assemblies''']] in excess of 150 mm (6") or more in depth are not permitted over conventionally insulated roof systems.
 {{hilite | Note the following restrictions and conditions, which apply to the above: || 2018-January-25 }}

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 :'''A. Single layer system:''' When insulation is installed as a single layer, flame protection over the cover board is required. Install the insulation and cover board with the proprietary accepted adhesive. Seal over all board joints and wall transitions with membrane manufacturer's approved self-adhered membrane tape.
-:'''B. Two layer system:''' When using a hot-applied adhesive, back mop and flop first layer of overlay board, or use manufacturer's accepted proprietary adhesives per published directions, offsetting the joints from those of the insulation. Tape the joints before applying the second layer, offsetting the joints from both layers below.  Finally, tape joints and install second layer offsetting the joints from those of the layer below.
+:'''B. Two layer system:''' When using a hot-applied adhesive, back mop and flop first layer of overlay board, or use manufacturer's accepted proprietary adhesives per published directions, offsetting the joints from those of the insulation. Tape the joints before applying the second layer, offsetting the joints from both layers below.
 As an alternative to the use of hot bitumen, the membrane manufacturer's proprietary insulation adhesives may be used to adhere accepted cover boards and insulation.

@@ Line 45: / Line 45: @@
 When asphaltic membranes are adhered (using hot asphalt, cold adhesives, or when applied with a torch), {{hilite | at least one layer of || 2018-January-25 }} overlay board is required over all types of insulation.  {{hilite | The exception to this requirement is mineral wool insulation used in a single or multi-layered adhered or partially adhered insulation assembly, where the top surface of the uppermost insulation layer incorporates an impregnated bitumen surface to which an asphaltic membrane may be torch welded, mop-applied or cold-adhered. || 2018-January-25 }}
-Conventionally insulated roof assemblies are required to have a minimum 12.5mm (½") adhered approved RoofStar-accepted gypsum overlay board, and insulation boards with a minimum compressive strength of 20 psi, under the roof membrane for [[RoofStar Guarantee Standards for SBS Roof Systems#SBSEXTENSIVE|'''Extensive Vegetated Systems''']] (less than 200 mm, 8" in depth).  [[RoofStar Guarantee Standards for SBS Roof Systems#SBSINTENSIVE|'''Intensive Vegetative Roof Assemblies''']] in excess of 200 mm (8") or more in depth are not permitted over conventionally insulated roof systems.
+'''Conventionally insulated roof assemblies''' are required to have a minimum 12.5mm (½") adhered approved RoofStar-accepted gypsum overlay board, and insulation boards with a minimum compressive strength of 20 psi, under the roof membrane for [[RoofStar Guarantee Standards for SBS Roof Systems#SBSEXTENSIVE|'''Extensive Vegetated Systems''']] (less than 200 mm, 8" in depth).  [[RoofStar Guarantee Standards for SBS Roof Systems#SBSINTENSIVE|'''Intensive Vegetative Roof Assemblies''']] in excess of 200 mm (8") or more in depth are not permitted over conventionally insulated roof systems.
 {{hilite | Note the following restrictions and conditions, which apply to the above: || 2018-January-25 }}

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 ==== Adhering ====
-When asphaltic membranes are adhered (using hot asphalt, cold adhesives, or when applied with a torch), at least one layer of overlay board is required over all types of insulation. In addition, the following standards, principles and information apply:
+When asphaltic membranes are adhered (using hot asphalt, cold adhesives, or when applied with a torch), {{hilite | at least one layer of || 2018-January-25 }} overlay board is required over all types of insulation.  {{hilite | The exception to this requirement is mineral wool insulation used in a single or multi-layered adhered or partially adhered insulation assembly, where the top surface of the uppermost insulation layer incorporates an impregnated bitumen surface to which an asphaltic membrane may be torch welded, mop-applied or cold-adhered. || 2018-January-25 }}
-'''Heat Sensitive Insulation:''' On all heat sensitive insulation (polystyrene, extruded, and expanded), an overlay consisting of two layers of acceptable cover board is to be used when using hot asphalt as an adhesive, or where the cover board is less than 1/2" in thickness on torch-applied assemblies.
+Conventionally insulated roof assemblies are required to have a minimum 12.5mm (½") adhered approved RoofStar-accepted gypsum overlay board, and insulation boards with a minimum compressive strength of 20 psi, under the roof membrane for [[RoofStar Guarantee Standards for SBS Roof Systems#SBSEXTENSIVE|'''Extensive Vegetated Systems''']] (less than 200 mm, 8" in depth).  [[RoofStar Guarantee Standards for SBS Roof Systems#SBSINTENSIVE|'''Intensive Vegetative Roof Assemblies''']] in excess of 200 mm (8") or more in depth are not permitted over conventionally insulated roof systems.
 :'''A. Single layer system:''' When insulation is installed as a single layer, flame protection over the cover board is required. Install the insulation and cover board with the proprietary accepted adhesive. Seal over all board joints and wall transitions with membrane manufacturer's approved self-adhered membrane tape.

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 ===Material Selection===
-See [[Insulation Overlay Board|'''Accepted Insulation Overlay boards''']] for RoofStar Guaranteed roof systems.
+See [[Insulation Overlay Board|'''Accepted Insulation Overlay boards''']] for '''''RoofStar Guaranteed''''' roof systems.
 ===Application===

← Older revision		Revision as of 17:38, 10 November 2016
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	RoofStar-accepted mechanically attached asphalt core overlay boards [minimum thickness 4.5 mm (3/16") nominal] or insulation and insulation overlay boards specifically designed for torch applications, must be attached with nails with a minimum 25 mm (1") nominal head size placed a minimum of one nail per 0.093 m² (1 sq. ft.) or plates and screws placed a minimum of 0.186 m² (2 sq. ft.). Seal all board joints and wall transitions with membrane manufacturer’s approved self-adhered membrane or tapes.		RoofStar-accepted mechanically attached asphalt core overlay boards [minimum thickness 4.5 mm (3/16") nominal] or insulation and insulation overlay boards specifically designed for torch applications, must be attached with nails with a minimum 25 mm (1") nominal head size placed a minimum of one nail per 0.093 m² (1 sq. ft.) or plates and screws placed a minimum of 0.186 m² (2 sq. ft.). Seal all board joints and wall transitions with membrane manufacturer’s approved self-adhered membrane or tapes.
−
−	~~====Joint Taping====~~
−	The only acceptable materials for taping joints in overlay board, insulation, gypsum board, and primed plywood are minimum 150 mm (6") No.15 felt, 150 mm (6") Fibreglass roof tape, or 150 mm (6") sheathing (membrane breather-type to CAN / CGSB 51.32-M77). The only acceptable methods of installation are by back-coating with asphalt, or laying with a back-coating machine expressly intended for the purpose.

	==== Joint Taping ====		==== Joint Taping ====

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 Insulation and overlay board joints are to be offset/staggered 300 mm (12") from adjacent layers and rows.  The uppermost layer of [insulation or] overlay board directly below membranes shall have joints that are offset/staggered from adjacent layers and rows.
-See also '''''RoofStar Guarantee Standards''''' for insulation layering in '''6.3.1'''.
+See also '''''RoofStar Guarantee Standards''''' for insulation layering in [[RoofStar Guarantee Standards for BUR Roof Systems#BURINSULATION |'''INSULATION''']]
 ===Material Selection===

@@ Line 51: / Line 51: @@
 :'''B. Two layer system:''' When using a hot-applied adhesive, back mop and flop first layer of overlay board, or use manufacturer's accepted proprietary adhesives per published directions, offsetting the joints from those of the insulation. Tape the joints before applying the second layer, offsetting the joints from both layers below.  Finally, tape joints and install second layer offsetting the joints from those of the layer below.
-Alternatively, the membrane manufacturer's proprietary insulation adhesives may be used to adhere accepted cover boards and insulation.
+As an alternative to the use of hot bitumen, the membrane manufacturer's proprietary insulation adhesives may be used to adhere accepted cover boards and insulation.
 RoofStar-accepted mechanically attached asphalt core overlay boards [minimum thickness 4.5 mm (3/16") nominal] or insulation and insulation overlay boards specifically designed for torch applications, must be attached with nails with a minimum 25 mm (1") nominal head size placed a minimum of one nail per 0.093 m² (1 sq. ft.) or plates and screws placed a minimum of 0.186 m² (2 sq. ft.). Seal all board joints and wall transitions with membrane manufacturer’s approved self-adhered membrane or tapes.
 ==== Joint Taping ====