RCABC Roof Curb Pentrations and Openings

RGC ROOFING PRACTICES MANUAL UPDATED 00-01-25 REV 2 TAB 8.3.5 PAGE 1

8.3.5 CURBS, PENETRATIONS AND OPENINGS: CURB OPENING (AIR HANDLING UNITS) WORK INCLUDED

(1) Gypsum Overlay Board: If required by design authority.

(2) Vapour Retarder: If required by design authority.

(3) Insulation: See list of accepted materials in Tab 2.2.

(4) Insulation Overlay: Where required. See RGC Guarantee Standard B4.1, B4.2 and C4.1

(5) Primary Membrane and Membrane Protection

(6) Membrane Flashing: Lap one ply over top of each side of curb (C) and mechanically fasten.

(7) Metal Base Flashing: Mechanically fastened. Standing seam at corners of cant.

RELATED WORK BY OTHERS

(A) Acceptable Deck

(B) Air / Vapour Seal

(C) Wood Curb / Blocking: Minimum 200 mm (8") and maximum 300 mm (12") above finished roof surface.

NOTE: • Refer to RGC Guarantee Standards for additional requirements


8.3.5 CURBS, PENETRATIONS AND OPENINGS: EQUIPMENT SLEEPER

WORK INCLUDED (1) Gypsum Overlay Board: If required by design authority. (2) Vapour Retarder: If required by design authority. (3) Insulation (4) Insulation Overlay: As required. See RGC Guarantee Standard B4.1, B4.2 and C4.1 (5) Primary Membrane and Membrane Protection (6) Membrane Flashing: Lap one ply from each side over top of sleeper (C) and mechanically fasten. (7) Alternate Cap Flashing: May be used instead of lapping membrane flashing over sleeper. (8) Metal Base Flashing: Mechanically fasten to top of wood blocking, standing seam at corners, optional on

flexible membrane systems. Optional on flexible membrane systems. Required on assemblies using gravel ballast filter mats. See RGC Guarantee Standard A6.9.1.2.

(9) Metal Cap Flashing: Flashings (8) and (9) may be one piece.

RELATED WORK BY OTHERS (A) Acceptable Deck (B) Air / Vapour Seal (C) Wood Blocking / Sleeper: Minimum 150 mm (6") thick, minimum 100 mm (4") above finished roof surface.



8.3.5 CURBS, PENETRATIONS AND OPENINGS: CURBED MULTIPLE ROOF PENETRATIONS WORK INCLUDED (1) Gypsum Overlay Board: If required by design authority.


(3) Insulation



(6) Membrane Flashing: Mechanically fasten to top of curb (C).

(7) Metal Base Flashing: Mechanically fasten to top of curb, standing seam at corners of cant, optional on flexible membrane systems. Optional on flexible membrane systems. Required on assemblies using gravel ballast filter mats. See RGC Guarantee Standard A6.9.1.2.

(8) Metal Counter Flashing

(9) Metal Hood

RELATED WORK BY OTHERS (A) Acceptable Deck


(C) Wood Blocking / Curb: Minimum 200 mm (8") and maximum 300 mm (12") above finished roof surface.



8.3.5 CURBS, PENETRATIONS AND OPENINGS: GUM PANS (Pitch Pockets) WORK INCLUDED (1) Gypsum Overlay Board: If required by design authority. (2) Vapour Retarder: If required by design authority. (3) Insulation: See list of accepted materials in Tab 2.2. (4) Insulation Overlay: As required. See RGC Guarantee Standard B4.1, B4.2 and C4.1 (5) Primary Membrane and Membrane Protection (6) Compatible Mastic: Use only the membrane manufacturers’ approved sealant. (7) Metal Gum Pan or Pitch Pocket: Minimum 100 mm (4") flange onto roof membrane. All corners, with the

exception of one job-site formed double standing seam corner joint and adjoining lapped flange joining, shall be closed and soldered. Minimum height of gum pan to be 100 mm (4"). See RGC Guarantee Standard A6.2

(8) Membrane Flashing: Onto primed metal flashing flange. (9) Packing: To prevent displacement of compatible mastic. (10) Structural Sealant: Use only the membrane manufacturers’ approved proprietary polyurethane based

structural sealant. (11) Back-up Storm Collar: To be installed whenever practical. Caulk at top of collar. RELATED WORK BY OTHERS (A) Acceptable Deck (B) Protrusion (C) Wood Blocking NOTE: • WARNING: DO NOT USE THIS DETAIL WITH HOT PIPES.

• AVOID THIS DETAIL: Wherever possible use Flanged Metal Stack Flashing (See Tab 8.3.5 ) or Curbed Opening (See Tab 8.3.5 Page 7).

• Refer to RGC Guarantee Standards for additional requirements.


8.3.5 CURBS, PENETRATIONS AND OPENINGS: METAL PLUMBING FLASHING

WORK INCLUDED (1) Gypsum Overlay Board: If required by design authority. (2) Vapour Retarder: If required by design authority. (3) Insulation: See list of accepted materials in Tab 2.2. (4) Insulation Overlay: As required. See RGC Guarantee Standard B4.1, B4.2 and C4.1 (5) Primary Membrane and Membrane Protection (6) Mastic: As approved by manufacturer. (7) Membrane Flashing: Onto primed metal flashing flange or adhesive coated for non-bituminous flexible

membrane systems. (8) Storm Collar, Typical Lead Cap or Typical Aluminum Cap: Reroofing only. Non- bituminous flexible

membrane skirt collar, sealed with compatible sealant and stainless steel hose clamps for use with pipes that extend above flashings.

RELATED WORK BY OTHERS (A) Acceptable Deck (B) Plumbing Stack: Extend to match top of metal flashing. (C) Wood Blocking: Optional. (D) Metal Flashing: Apply in a bed of mastic. Fastened over membrane to wood blocking or roof deck. (E) Typical Aluminum Cap: For use with aluminum flashings. (F) Typical Lead Cap: For use with lead flashings. (G) Storm Collar: Non-Bituminous flexible membrane skirt collar, sealed with compatible sealant and stainless

steel hose clamp. Use with pipes that extend above flashings.

NOTE: • Refer to RGC Guarantee Standards for additional requirements • Aluminum flashings required for torch-applied roof systems.


8.3.5 CURBS, PENETRATIONS AND OPENINGS: MECHANICAL CURB OPENING WORK INCLUDED




(4) Insulation Overlay: As required. See RGC Guarantee Standard B4.1, B4.2 and C4.1


(6) Membrane Flashing: Tuck under metal curb flange of each side of curb (C) and mechanically fasten.

(7) Metal Base Flashing: Mechanically fasten, standing seam at corners of cant.


(A) Acceptable Deck


(C) Mechanical Curb: Minimum 200 mm (8") and maximum 300 mm (12") above finished roof surface. Keep curb covered during construction to prevent water ingress.

(D) Rigid Insulation



8.3.5 CURBS, PENETRATIONS AND OPENINGS: TWO PART CABLE FLASHING (RE-ROOFING DETAIL) WORK INCLUDED




(4) Insulation Overlay: As required. See RGC Guarantee Standard B4.1, B4.2 and C4.1


(6) Mastic: As approved by manufacturer.

(7) Membrane Flashing: Onto primed metal flashing or adhesive coated for non-bituminous flexible membrane systems.


(A) Acceptable Deck

(B) Wood Blocking

(C) Two Piece Cable Flashing: Assembled around cables, which cannot be or are not disconnected, and laid in bed of mastic (adhesive for single ply systems).



8.3.6 WATER CONTROL AND DRAINAGE: CAST IRON DRAIN

WORK INCLUDED







(7) Membrane Flashing: As approved by membrane manufacturer (See (C) below).


(A) Acceptable Deck

(B) Roof Drain Assembly

(C) Lead Flashing: Minimum 15 kg / m² (3 lb / ft²) weight lead sheet; flange extending minimum 25 mm (1") into bowl to 150 mm (6") beyond perimeter of drain; embed in mastic (6) and prime top surface where required by manufacturer or minimum 1 m x 1 m (39" x 39") 3 mm thick modified bituminous base sheet; to be supplied by trade supplying roof drain. For asphalt and gravel built-up systems only.


• Leader size is determined by using the calculation found in the BC Building Code at Appendix P.7.4.10 and Table 7.4.10.11 (Table 7.4.10.10 for gutters) in conjunction with the 15-minute rainfall value from the National Building Code, Appendix C.


8.3.6 WATER CONTROL AND DRAINAGE: SPUN COPPER ROOF DRAIN

WORK INCLUDED







(7) Membrane Flashing: Onto primed drain flange or adhesive for non-bituminous flexible membrane systems.


(A) Acceptable Deck





8.3.6 WATER CONTROL AND DRAINAGE: CLAMPING SPUN COPPER ROOF DRAIN

WORK INCLUDED







(7) Membrane Flashing: Onto primed drain flange or adhesive for non-bituminous flexible membrane systems.


(A) Acceptable Deck





8.3.6 WATER CONTROL AND DRAINAGE: OPEN WALL SCUPPER WITH HOPPER

WORK INCLUDED (1) Vapour Retarder: If required by design authority. (Optional terminations) (2) Insulation: See list of accepted materials in Tab 2.2. (3) Insulation Overlay: Where required. See RGC Guarantee Standard B4.1, B4.2 and C4.1 (4) Primary Membrane and Membrane Protection (5) Metal Scupper with Hopper:: The outside face of scupper to be 37.7mm (1½") lower than the box height

with a 12.7mm (½") drip edge. Installed in a thin bed of compatible mastic. Interface between outside wall and scupper should be caulked with appropriate sealant. Installed when wall finish is complete prior to completion of roofing or sheet metal (e.g.: re-roofing).

(6) Scupper Membrane Flashing (7) Membrane Flashing (8) Metal Base Flashing: Mechanically fastened. Optional on flexible membrane systems. Required on

assemblies using gravel ballast filter mats. See RGC Guarantee Standard A6.9.1.2. (9) Metal Cap Flashing: Fasten with continuous concealed clip-type fasteners or with 2 concealed discontinuous

clips or cladding screws evenly spaced between seams. See RGC Guarantee Standard A6.10.3 and A6.10.4. Flashing 8 and 9 may be one piece.

RELATED WORK BY OTHERS (A) Acceptable Deck (B) Air / Vapour Seal (C) Wood Blocking Assembly (D) Plywood: If required by design authority. See RGC Guarantee Standard A1.5.1 and A1.5.3 (E) Exterior Wall Finish: Interface between outside wall and scupper to be caulked with appropriate sealant.

Installed by trade responsible for outside wall finish if roofing and metal flashing has been completed prior to exterior wall finish.



8.3.6 WATER CONTROL AND DRAINAGE: THRU WALL SCUPPER WITH HOPPER

WORK INCLUDED (1) Vapour Retarder: If required by design authority. (Optional terminations) (2) Insulation: See list of accepted materials in Tab 2.2. (3) Insulation Overlay: Where required. See RGC Guarantee Standard B4.1, B4.2 and C4.1 (4) Primary Membrane and Membrane Protection (5) Membrane Flashing (6) Metal Scupper with Hopper: The outside face of scupper to be minimum 37.7mm (1½") lower than the box

height with a 12.7mm (½") drip edge. Installed in a thin bed of compatible mastic. Interface between outside wall and scupper should be caulked with appropriate sealant. Installed when wall finish is complete prior to completion of roofing or sheet metal (e.g.: re-roofing).

(7) Mastic: Compatible with membrane (8) Scupper Membrane Flashing: (9) Metal Base Flashing: Mechanically fastened (optional on flexible membrane systems). (10) Metal Counter Flashing: Into reglet approximately 30 mm (1 ¼"). RELATED WORK BY OTHERS (A) Acceptable Deck (B) Air / Vapour Seal (C) Wood Blocking Assembly: Optional with insulation cant strips. (D) Plywood: If required by design authority. See RGC Guarantee Standard A1.5.1 and A1.5.3 (E) Exterior Wall Finish: Interface between outside wall and scupper to be caulked with appropriate sealant.

Installed by trade responsible for outside wall finish if roofing and metal flashing has been completed prior to exterior wall finish.


RCABC Roof Curb Pentrations and Openings

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