SBS Mechanical Equipment Curb

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SBS Mechanical Equipment Curb



Division D - Construction Details


SBS | Mechanical Equipment Curb ( Article 12.3.2.4.)

Notice to Reader
Images used in a Construction Detail are representative and not prescriptive, and are not necessarily drawn to scale. They are intended to support the related Standard (Ref. Division A, Article 2.2.1.2.).

The reader may link to the related Article in the detail title, or link to the Standard as it relates to a specific element in the detail. All hyperlinks are displayed blue text.

SBS Details

SBS 11.3.3.2.-3B.jpg

SBS 11.3.3.2.-3C.jpg

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Print Sheet


1 WORK INCLUDED

(1) Supporting Deck Overlay
Required when insulation is too thin to span flutes of steel decking or when required as thermal barrier by design authority.
(2) Air or Vapour Control Layers
If required by design authority.
(3) Insulation
Mechanically fastened. See available insulation products in the Accepted Materials section of this Manual.
(4) Insulation Overlay
As required.
(5) Flame protection (membrane strip)
Also refer to the Standard for alternative methods for handling flame-sensitive details and roof perimeters.
(6) Base Field Membrane
Adhered to overlay board using asphalt, cold adhesive, self-adhered, mechanical attachment or torch applied according to manufacturer's specification. Torching directly to wood surfaces is not permitted.
(7) Base Membrane Flashing
Adhered according to manufacturer's specifications, using cold adhesive, hot asphalt, self-adhered or torch applied to cover boards, or mechanically attached membrane. Must be tucked under metal flange and mechanically attached to nailing strip.
(8) Cap Field Membrane
Applied according to manufacturer's printed instructions and to RoofStar Guarantee Standards.
(9) Cap Membrane Flashing
Applied according to manufacturer's printed instructions and to RoofStar Guarantee Standards. Must be tucked under metal flange and mechanically attached to the nailing strip.
(10) Metal Flashing
Mechanically fasten, standing seam at corners. Full width base flashing optional on flexible membranes. Partial skirt flashing minimum 75 mm (3") required on mechanical curbs that require flashing under metal flange.
(11) Alternate Corner Cap (Shop-manufactured)
Weld seams. Bed in two parallel courses of butyl tape or acceptable sealant. Mechanically fasten to outside face of curb flange.
(12) Butyl Tape (sealant)
(13) Fasteners
Flanged fasteners with neoprene washers.

2 RELATED WORK BY OTHERS

(A) Supporting Deck Structure
(B) Air or Vapour Control Layer Seal
Air and vapour controls installed by others should be made accessible to the Contractor for connection, to maintain continuity across assemblies and throughout the building enclosure.
(C) Mechanical Curb
Minimum 200 mm (8") above finished roof surface.
  • Some mechanical curbs are designed to allow membrane flashing to be carried up onto metal flange. Install according to manufacturers’ instructions.
(D) Wood Nailing Board
(E) Neoprene Gasket for RTU

SBS 11.3.3.2.-3A.jpg

NOTE: See the Standard for additional requirements.


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