Siphonic Roof Drainage
ME- Building Group
SECTION 221416 - SIPHONIC ROOF DRAINAGE
PART 1 - GENERAL
1.1
RELATED DOCUMENTS
A.
1.2
Drawings and general provisions of the Contract, including General Conditions, exhibits and
Division 1 specification sections, apply to this section.
SUMMARY
A.
This specification section describes the technical specification and general instructions for the
fabrication, handling, delivery and installation of a siphonic roof drainage system.
B.
Section Includes:
C.
1.3
1.
Siphonic roof drains,
2.
Pipe, fittings and couplings,
3.
Hangers, supports and bracing,
4.
Installation requirements,
5.
Supplemental steel,
6.
Construction tolerances,
7.
Integrity testing,
8.
Final inspections.
Section does not include:
1.
Conventional roof drainage,
2.
Other plumbing systems not related to roof drainage.
RELATED SECTIONS
A.
1.4
Division 31 “Earthwork”
REFERENCES
A.
American Iron and Steel Institute (AISI)
B.
American National Standards Institute (ANSI)
Page 1 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
C.
1.
B16.5 “Pipe Flanges and Flanged Fittings,”
2.
B18.2.1 “Square and Hex Bolts and Screws (Inch Series),”
3.
B18.2.2 “Square and Hex Nuts (Inch Series).”
American Society of Civil Engineers (ASCE)
1.
D.
F.
G.
ASCE 7 “Minimum Design Loads for Buildings and Other Structures.”
American Society of Plumbing Engineers (ASPE)
1.
E.
ME- Building Group
45 “Plumbing Engineering and Design Standard for Siphonic Roof Drainage”
American Society for Testing and Materials (ASTM)
1.
D1784 “Standard Specification for Rigid Poly(Vinyl Chloride) (PVC) Compounds and
Chlorinated Poly(Vinyl Chloride) (CPVC) Compounds,”
2.
D1785 “Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Pipe, Schedules
40, 80, and 120,”
3.
F441/F441M-02 “Standard Specification for Chlorinated Poly(Vinyl Chloride) (CPVC)
Plastic Pipe, Schedules 40 and 80,”
4.
D2665 “Standard Specification for Poly(Vinyl Chloride) (PVC) Plastic Drain, Waste, and
Vent Pipe and Fittings,”
5.
ASTM D2855 “Standard Practice for Making Solvent-Cemented Joints with Poly(Vinyl
Chloride) (PVC) Pipe and Fittings,”
6.
ASTM D3311 “Standard Specification for Drain, Waste, and Vent (DWV) Plastic Fittings
Patterns,”
7.
E-814 (ANSI/UL-1479) “Standard Method of Fire Tests for Through Penetration Fire
Stops,”
Steel Deck Institute (SDI)
1.
Design Manual for Composite Decks, Form Decks and Roof Decks,
2.
Manual of Construction with Steel Deck,
3.
Standard Practice Details.
Underwriters Laboratory
1.
UL Fire Resistance Directory
Page 2 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
1.5
ME- Building Group
SYSTEM DESCRIPTION
A.
B.
1.6
General
1.
This siphonic roof drainage system is classified as an “Alternative Engineered Design”.
2.
This is an engineered system. Guidance for the installation of this system is supplied by
this specification and the related Drawings. The performance of this system is related
directly to the pipe configuration, pipe diameters, elevations, fittings and orientation.
Any changes to the pipe configuration outside of specified tolerances are required to be
examined and approved by the Designer prior to installation.
3.
Proper installation of this system requires a detailed set of fabrication drawings including
relationship to surrounding structure, mechanical systems, etc. Such fabrication
drawings shall include pipe cut lengths for each pipe segment.
Basis of Design
1.
This system is designed to drain rainwater from the roof at a rate equal to or greater
than 3.5 inches per hour of rainfall.
2.
Roof drains are set in sumps to control the depth of water around the drain.
SUBMITTALS
A.
B.
General
1.
Submit product data, shop drawings and other related documentation in accordance
with the conditions of the Contract.
2.
Submit six (6) legible copies of all shop drawings and fabrication drawings to the
Designer.
3.
Draw shop drawings at a scale of 3/8” = 1’-0”. Indicate pipe centerline elevations
referenced to the project elevation datum. Indicate pipe distances from columns and
fixed walls.
4.
Submit shop drawings and fabrication drawings on a schedule to allow ten (10) business
days for Designer review.
Submit Product Data
1.
Product data submittal shall include all components including, but not limited to:
a.
Siphonic roof drains,
b.
Drain installation procedures,
c.
Pipe and fittings,
Page 3 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
2.
C.
D.
d.
Couplings, joint methods, gaskets,
e.
Hangers and supports,
f.
Supplemental steel,
Closeout Submittals
a.
Actual as-built drawings,
b.
Operation and Maintenance Manuals,
c.
Pipe integrity test reports,
d.
Siphonic drain manufacturer flashing warrantee,
e.
Final inspection reports.
Submit Shop Drawings
1.
Submit scale drawings showing physical layout of piping in plan view and elevation view.
Include references for pipe elevation, distance from columns, and pipe cut lengths for
each pipe section.
2.
Drawings shall be to scale with 3/8” equal to one foot.
3.
Overlay structural, architectural, MEP and other building elements on shop drawings to
coordinate piping with potential obstructions or conflicts.
4.
Submit siphonic roof drain installation procedures including fastening to roof deck and
flashing clamp installation.
Submit Maintenance Data
1.
1.7
ME- Building Group
Submit maintenance instructions for inclusion in Operating and Maintenance Manuals.
QUALITY ASSURANCE
A.
1.8
A plumbing contractor duly licensed with local and/or state authorities shall install the siphonic
roof drainage system.
DELIVERY, STORAGE AND HANDLING
A.
Hardware
1.
Retain shipping flange protective covers and protective coatings during storage.
2.
Protect components against damage.
Page 4 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
3.
ME- Building Group
Comply with manufacturer’s rigging instructions for handling.
PART 2 - PRODUCTS
2.1
MANUFACTURERS
A.
Subject to compliance with requirements and Drawings, provide products from one of the
following manufacturers or vendors.
B.
Siphonic Roof Drains
C.
D.
E.
2.2
1.
U.V. System, Inc.
2.
Design is based on product-specific data. Substitutions require re-engineering at
Contractor’s expense.
Pipe and Fittings, PVC
1.
Charlotte Pipe and Foundry Company,
2.
Approved equal.
Transition Couplings
1.
Fernco
2.
Dresser
3.
Approved equal
Hangers
1.
B-Line,
2.
Carpenter – Patterson,
3.
Tolco,
4.
Approved equal.
SIPHONIC ROOF DRAINS (RD-1)
A.
Equal to U.V. System (Series).
B.
Drain body:
C.
Flashing clamp:
D.
Baffle/vanes: Aluminum Alloy, ASTM A413.1,
Stainless steel, AISI Type 304.
Stainless steel with stainless steel fastening hex-nuts,
Page 5 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
ME- Building Group
E.
Leaf Guard:
F.
Spigot outlet: Plain end.
G.
Accessories: Under-deck clamp, sump receiver pan.
H.
Compliant with the previsions of ANSI/ASME A112.6.9.
2.3
Integral with baffle.
PIPE, FITTINGS AND COUPLINGS
PIPE CLASS D2665
ITEM
SPECIFICATION
Pipe
Material
Pipe Standard
Polyvinylchloride (PVC).
ASTM D2665 DWV and all referenced documents.
ASTM D1785 or F441 plain end pressure pipe for 2.5” diameter.
Wall Thickness
Schedule 80.
Product Marking
As described in ASTM D2665.
Material
Polyvinylchloride (PVC).
Standard
ASTM D2665. ASTM D3311 DWV pattern. D1784 of F441 for 2.5”
diameter.
Wall Thickness
Same as pipe.
End Connections
Socket.
Description
Solvent cemented socket joint.
Assembly
Per ASTM D2665 and D2885.
Material
Ductile iron, ASTM A536.
Coating
Manufacturer standard enamel finish
Style
ANSI/B16.5 Class 150 dimensions.
Gasket
EPDM.
Pressure Rating
Not less than 230 psig at 73ºF.
ASTM D3311. Bushings not permitted.
PVC. Threaded adaptor. FNPT to socket joint.
Steel x PVC Mission adaptor coupling.
Fittings
Joint
Flange
Reducers
Adaptors
2.4
Transition Couplings
A.
Couplings connecting drain to pipe shall be capable of withstanding vacuum conditions of the
siphonic system.
B.
Transition couplings shall be equal to Fernco #3005-33 and 1056-33
1.
Center-Sleeve Material: Stainless steel.
2.
Gasket Material: Natural or synthetic rubber.
3.
Metal Component Finish: Corrosion-resistant coating or material.
Page 6 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
2.5
ME- Building Group
HANGERS AND SUPPORTS
A.
Pipe hangers shall be equal to B-Line B3100 series standard clevis hanger. Galvanized carbon
steel.
B.
Hanger rods shall be secured to structure with B-Line B3205 threaded rod.
C.
Refer to details on Drawings, including structural drawings for requirements for supplemental
steel and reinforcing.
PART 3 - EXECUTION
3.1
GENERAL
A.
The performance of the siphonic roof drainage system is related directly to the pipe
configuration, including all lengths, diameters, fittings, offsets and reductions.
B.
Do not make changes to the pipe configuration outside of specified tolerances. The Designer
must validate any changes to the siphonic piping.
C.
Non-siphonic roof drainage piping shall be installed in accordance with the governing plumbing
code. Pipe changes conforming to the code and the intent of the design may be made without
Designer approval.
3.2
INSTALLATION
A.
Install piping, hangers and drains in accordance with manufacturers’ recommendations.
B.
Piping shall be properly supported to prevent stress on pipe and couplings.
C.
Provide supplemental steel as shown on Drawings and specified under structural specification
sections and details for proper hanging from steel structure and for reinforcing.
D.
Install siphonic drains to laser level precision. Each drain of a common downpipe shall be
installed with variation in sump body elevation within ±0.375 inches. Adjust drain bodies up or
down to achieve tolerance.
E.
Construction tolerances for siphonic pipe cut lengths shall be:
F.
1.
4” and smaller:
±4 inches
2.
5” and larger:
±8 inches
Cut siphonic pipe lengths to match dimensions as shown on the Drawings. Do not add extra
fittings or make additional offsets. If piping configuration requires modification to avoid
conflicts, notify the Designer prior to installation. The Designer will validate piping changes and
issue approved changes in writing.
Page 7 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
ME- Building Group
1.
Dimensions shown on the drawings are intended to reinforce the importance of the
developed length of pipe segments on the overall performance of the siphonic roof
drainage system.
2.
Drawings and specifications do not reflect every element of the physical installation and
shall not be construed as perfect. Additional details may be required and are anticipated
during the construction process or during preparation of fabrication drawings or other
submittals.
3.
Minor adjustments to the piping system are to be expected. The dimensions shown on
the Drawings are not intended to convey an immutable design. However, any minor
changes outside the specified tolerances shall be validated by the Designer.
4.
The Contractor is expected to have a reasonable number of questions about the design
intent or information provided on the Contract Documents.
G.
Provide eccentric reducer fittings where available. Install such that the crown of the pipe is flat.
H.
For thermoplastic pipe, space hangers every 4 feet on center. Provide hangers at every change
in direction.
I.
Provide lateral sway bracing at each tailpiece, at every change in direction and at intervals
indicated on the plans.
J.
Provide longitudinal sway bracing at intervals indicated on the plans.
K.
Make trench bottoms smooth and of uniform grade with either undisturbed soil or a layer of
selected and compacted backfill so that no settlement will be encountered. Pipe shall bear on
this material throughout the entire length of its barrel.
L.
Insulate all horizontal piping and vertical tailpieces to bottom of roof deck. Insulation shall be
½” minimum thickness. Refer to section 15400 “Plumbing” for insulation products and
installation procedures.
3.3
INTEGRITY TESTING
A.
Test the integrity of all piping couplings and segments.
B.
Perform testing on the complete system or in sections.
C.
Perform testing prior to installation of insulation covering.
D.
Positive Pressure Testing
1.
Test piping with water.
2.
Test underground piping prior to backfilling. Hydrostatically test piping with water and
pump to a pressure of 50 feet of water column (21.6 psig) for six hours. Pressure shall
not drop by more than 5% during testing period.
Page 8 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package
Siphonic Roof Drainage
ME- Building Group
3.
Test above ground piping from base of stack cleanout to roof drains.
4.
Verify that personnel are clear of drain test plugs for the duration of the testing. Verify
that test plugs in drains hold during testing.
5.
Fill piping system with water from base of stack cleanout to level with drain baffle plate.
6.
Verify that baffle plates are level to each other in accordance with installation tolerances.
Identify if any drains too high relative to the rest and adjust level of the drain body.
Refer to installation procedures.
7.
Verify flashing integrity. Identify any leaks in roof drain flashing from below.
8.
Identify and repair any leakage and repeat pressure test until satisfactory.
END OF SECTION
Page 9 of 9
Revision Date: 01/21/14
File name: 116101133
Project & Bid Package