Difference between revisions of "Deck and Wall Overlays"

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=== General ===
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NOTE: Refer to subsection 3 (SUBSTRATES - DECK OVERLAY BOARD and WALL SHEATHING) of the RoofStar Guarantee Standards for either [[Section:D. Low Slope Roofs|Low Slope Roof Systems]] or for [[ASM (Architectural Sheet Metal) Roof Systems|Architectural Sheet Metal Roof Systems]].
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A roof system underlay is installed under the roof system and over the roof deck assembly. Underlays are most commonly placed over steel decks to provide a level surface for the membrane, or as a thermal barrier between the roof deck and combustible insulations.
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RGC requires either minimum 12.7 mm (1/2") gypsum with fibreglass facers and a silicone treated gypsum core (See Section 2.1, A2.5) or minimum 12.7 mm (1/2") plywood as an underlay for membranes installed directly over steel decks. Where an underlay is used as a thermal barrier, it must conform to the applicable code and insurance requirements for the roof assembly.
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<big><big>Division E - General Information</big></big>
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<big><big><big><big><big>Deck and Wall Overlays</big></big></big></big></big>
  
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=== Underlays for Metal Roofing ===
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| colspan="2"  | '''NOTICE TO READER''': This is an <u>information page only</u>.  To read the standards applicable to a particular Waterproofing or Water-shedding System, refer to the actual Standard located in [[Division B | '''Division B''']].
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Acceptable membrane underlays for metal roofing are listed in Section 8.2 and in Section 2.2 (accepted Materials list) of this manual.
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Deck and wall overlays (also called a system underlays) are installed under the roof system and over the supporting deck or wall structure, to provide a suitable substrate for roof materials. These products are most commonly placed over steel decks to provide a level surface for the membrane, or as a thermal barrier between the roof deck and combustible insulation.
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Latest revision as of 15:33, 9 September 2021


Division E - General Information

Deck and Wall Overlays

NOTICE TO READER: This is an information page only. To read the standards applicable to a particular Waterproofing or Water-shedding System, refer to the actual Standard located in Division B.

Deck and wall overlays (also called a system underlays) are installed under the roof system and over the supporting deck or wall structure, to provide a suitable substrate for roof materials. These products are most commonly placed over steel decks to provide a level surface for the membrane, or as a thermal barrier between the roof deck and combustible insulation.

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