Difference between revisions of "Insulation Joints and Overlays"
Difference between revisions of "Insulation Joints and Overlays"
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| − | + | <big><big><big>General</big></big></big> | |
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Insulation overlays are used to separate the roof membrane from the primary insulation, usually for one of two reasons: | Insulation overlays are used to separate the roof membrane from the primary insulation, usually for one of two reasons: | ||
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<b>NOTE</b>: All hot asphalt-adhered asphaltic membranes (built-up roofing, modified bitumen, etc.) require an insulation overlay over heat sensitive insulations and heat insensitive foamed insulation. '''''RoofStar Guarantee Standards''''' for heat sensitive insulation materials<b> require</b> a two-layer overlay board for a five (5) or ten (10) year Guarantee. The '''''RoofStar Guarantee Program''''' <b>requires</b> the use of a two-layer overlay board over heat sensitive insulation in all cases, and also <b>requires</b> a single-layer overlay board application over heat insensitive insulation for all hot asphalt-adhered membranes. For single-ply, non-asphaltic membrane roofing systems, the membrane manufacturer should be consulted for proprietary options. | <b>NOTE</b>: All hot asphalt-adhered asphaltic membranes (built-up roofing, modified bitumen, etc.) require an insulation overlay over heat sensitive insulations and heat insensitive foamed insulation. '''''RoofStar Guarantee Standards''''' for heat sensitive insulation materials<b> require</b> a two-layer overlay board for a five (5) or ten (10) year Guarantee. The '''''RoofStar Guarantee Program''''' <b>requires</b> the use of a two-layer overlay board over heat sensitive insulation in all cases, and also <b>requires</b> a single-layer overlay board application over heat insensitive insulation for all hot asphalt-adhered membranes. For single-ply, non-asphaltic membrane roofing systems, the membrane manufacturer should be consulted for proprietary options. | ||
| − | + | <big><big><big>Insulation Joint Tape</big></big></big> | |
Where the <i>RoofStar Guarantee Standards</i> or the roof system specifications call for | Where the <i>RoofStar Guarantee Standards</i> or the roof system specifications call for | ||
taping fibreboard or insulation joints, consult the list of '''[[Insulation Joint Tape|Accepted Materials: Insulation Joint Tape]]''' section of this Manual. | taping fibreboard or insulation joints, consult the list of '''[[Insulation Joint Tape|Accepted Materials: Insulation Joint Tape]]''' section of this Manual. | ||
| − | + | <big><big><big>Asphalt and Paraffin-Impregnated / Coated Fibreboard Roof Insulation and Insulation Overlay Board</big></big></big> | |
Under construction | Under construction | ||
| − | + | <big><big><big>Proprietary Overlay Boards</big></big></big> | |
Under construction | Under construction | ||
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<hr> | <hr> | ||
| − | + | <big><big><big>Materials</big></big></big> | |
| − | To view materials accepted for use in the RoofStar Guarantee Program, see '''[[Insulation Overlay Board|Accepted Materials: Insulation Overlay Board]]'''. | + | To view materials accepted for use in the '''''RoofStar Guarantee Program''''', see '''[[Insulation Overlay Board|Accepted Materials: Insulation Overlay Board]]'''. |
<hr> | <hr> | ||
Revision as of 20:59, 22 August 2016
General
Insulation overlays are used to separate the roof membrane from the primary insulation, usually for one of two reasons:
- to prevent the insulation from affecting the performance of the roof membrane
- to prevent the roof membrane and / or the method of application from affecting the insulation
The insulation can affect the performance of the roof membrane in the following ways:
- the insulation may be incompatible with the membrane, resulting in a loss of physical properties
- different coefficients of thermal expansion may result in membrane splits / cracks.
The roof membrane and / or the method of application can affect the insulation in the following ways:
- the insulation may not be capable of withstanding asphalt application temperatures and may “burn-out”
- some insulation materials will not accommodate direct torch-applied membranes
- insulation materials that are too “soft” may result in delamination or damage to the membrane or insulation when exposed to heavy loads or traffic
- the solvents and adhesives used for flexible membranes may adversely affect the insulation.
NOTE: All hot asphalt-adhered asphaltic membranes (built-up roofing, modified bitumen, etc.) require an insulation overlay over heat sensitive insulations and heat insensitive foamed insulation. RoofStar Guarantee Standards for heat sensitive insulation materials require a two-layer overlay board for a five (5) or ten (10) year Guarantee. The RoofStar Guarantee Program requires the use of a two-layer overlay board over heat sensitive insulation in all cases, and also requires a single-layer overlay board application over heat insensitive insulation for all hot asphalt-adhered membranes. For single-ply, non-asphaltic membrane roofing systems, the membrane manufacturer should be consulted for proprietary options.
Insulation Joint Tape
Where the RoofStar Guarantee Standards or the roof system specifications call for taping fibreboard or insulation joints, consult the list of Accepted Materials: Insulation Joint Tape section of this Manual.
Asphalt and Paraffin-Impregnated / Coated Fibreboard Roof Insulation and Insulation Overlay Board
Under construction
Proprietary Overlay Boards
Under construction
Materials
To view materials accepted for use in the RoofStar Guarantee Program, see Accepted Materials: Insulation Overlay Board.