SBS Conventionally Insulated System (alternate)

Division D - Construction Details

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SBS | Conventionally Insulated System (Alternate) ( Article 1.1.3.1.)

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

1 WORK INCLUDED

(1) Supporting Deck Overlay

Optional, depending upon deck condition and roof system requirements.

(2) Air or Vapour Control Layer

Installed following the requirements of Part 6 in this Standard.

(3) Insulation

Installed in staggered and offset layers (not fully illustrated), and secured in accordance with the design of the system, which is based on the British Columbia Building Code, Part 4 and Part 5, and on Part 3 of the RoofStar Guarantee Standards for the membrane system type.

(4) Insulation Overlay

Subject to the requirements of Part 8 in the RoofStar Guarantee Standards for the membrane system type.

(5) Primer

As required by the membrane manufacturer.

(6) Base Membrane (pre-flashing, as illustrated)

Base membrane flashing is applied before the field membrane (pre-flashing), and is carried vertically up a wall or parapet at least 200 mm (8”); on parapets, carry the base membrane flashing over the outside face of the parapet at least 50 mm (2”) and secure it (see 10.3.5.1 (2)). Extend base membrane flashing onto the field substrate at least 100 mm (4”) (greater if required by the membrane manufacturer). See also Figure 10.2 (a through d) for sequential illustrations.

(7) Base Membrane (field)

Pre-flashing approach (Illustrated). Base field membrane is installed on a suitable, prepared substrate. See 9.3 for application requirements. If permitted by the membrane manufacturer, the field membrane may be turned up at the ends at least 100 mm (4”) (see illustration above), to protect any vulnerabilities at the change in plane. Also see 10.3.3 for other application approaches.

(8) Cap Membrane (field)

Granule-surfaced membrane, which may be adhered, self-adhered or heat-welded. See Tables 9.1 and 9.2 for acceptable cap membrane types and their securement options. See 9.3 for application requirements.

(9) Cap Membrane (flashing)

Extended vertically past the termination of the base membrane flashing, to provide a positive seal at the top edge. Membrane may be terminated at the top of the vertical plane or turned onto the top of the parapet as required by the manufacturer (9a).

(10) Metal Cap Flashing

Fabricated and secured according to the requirements in Part 13 METAL FLASHINGS.

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2 RELATED WORK BY OTHERS

(A) Acceptable Deck

(B) Suitable Wall Sheathing

If and as required.

(C) Sloped Parapet Top

Sloped to roof where parapet is over 100 mm (4") in width.

(D) Wall or Parapet Structure

NOTE: See the Standard for additional requirements.

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