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SECTION 07 72 00
ROOF ACCESSORIES
 
 
Copyright 2018 - 2018 ARCAT, Inc. - All rights reserved
** NOTE TO SPECIFIER ** Green Link, Inc., pipe and paver supports.
This section is based on the products of Green Link, Inc., which is located at:
5519 E Cork St
Kalamazoo, MI 49048
Toll Free Tel: (888) 672-9897
Tel: (269) 216-9229
Email: sales@greenlinkengineering.com
Web: http://www.greenlinkengineering.com
HYPERLINK "http://www.arcat.com/arcatcos/cos9550/arc50732.html?src=spec" click Herefor additional information.
KnuckleHead Rooftop Support System: KnuckleHeads are a height-adjustable rooftop support system featuring a range of designs and extensions that protect roofs by keeping pipes, struts, HVAC equipment, solar arrays, ductwork, walkways, and cable trays elevated.
 
PART 1 GENERAL
 
1.1
SECTION INCLUDES
 
** NOTE TO SPECIFIER ** Delete items below not required for project.
 
A.
Adjustable height molded fiberglass-reinforced nylon supports for pipes, struts and frames intended for exterior rooftop applications.
1.2
RELATED SECTIONS
 
** NOTE TO SPECIFIER ** Delete any sections below not relevant to this project; add others as required.
 
A.
Section 07 51 13 - Built-Up Asphalt Roofing.
B.
Section 07 51 00 - Built-Up Bituminous Roofing.
C.
Section 07 53 13 - Chlorinated-Polyethylene Roofing.
D.
Section 07 54 16 - Ethylene-Interpolymer Roofing
E.
Section 07 52 00 - Modified Bituminous Membrane Roofing.
F.
Section 07 56 00 - Fluid-Applied Roofing.
G.
Section 07 57 13 - Sprayed Polyuethane Foam Roofing.
1.3
REFERENCES
 
** NOTE TO SPECIFIER ** Delete references from the list below that are not actually required by the text of the edited section.
 
A.
ASTM International (ASTM):
1.
ASTM C1289, Standard Specification for Faced Rigid Cellular Polyisocyanurate Thermal Insulation Board.
2.
ASTM D2863, Standard Test Methods for Measuring the Minimum Oxygen Concentration to Support Candle-Like Combustion of Plastics (Oxygen Index).
3.
ASTM D4066, Standard Classification System for Nylon Injection and Extrusion Materials (PA).
B.
International Electrotechnical Commission (IEC).
1.
IEC 60243, Electric Strength of Insulating Materials - Test Methods - Part 1: Tests at Power Frequencies.
2.
IEC 60695-2-12, Fire Hazard Testing - Part 2-12: Glowing/Hot-Wire Based Test Methods - Glow-Wire flammability Index (GWFI) Test Method for Materials.
C.
International Standards Organization (ISO).
1.
ISO 62, Plastics - Determination of Water Absorption
2.
ISO 75-1, Plastics - Determination of Temperature of Deflection Under Load - Part 1: General Test Method.
3.
ISO 180, Plastics - Determination of Izod Impact Strength.
4.
ISO 294-4, Plastics - Injection Moulding of Test Specimens of Thermoplastic Materials - Part 4: Determination of Moulding Shrinkage.
5.
ISO 306, Plastics - Thermoplastic Materials - Determination of Vicat Softening Temperature (VST).
6.
ISO 527, Plastics - Determination of Tensile Properties - Part 1: General Principles.
7.
ISO 1183, Plastics - Methods for Determining the Density of Non-Cellular Plastics - Part 1: Immersion Method, Liquid Pyknometer Method and Titration Method.
8.
ISO 3146, Plastics - Determination of Melting Behavior (Melting Temperature or Melting Range) of Semi-Crystalline Polymers by Capillary Tube and Polarizing-Microscope Methods.
9.
ISO 11359], Plastics - Thermomechanical Analysis (TMA) - Part 2: Determination of Coefficient of Linear Thermal Expansion and Glass Transition Temperature.
D.
Underwriter's Laboratories (UL).
1.
UL 746A, Standard for Polymeric Materials - Short Term Property Evaluations.
2.
UL 746B, Standard for Polymeric Materials - Long Term Property Evaluations.
E.
US Green Building Council (USGBC).
1.
LEED NC Version 2.2, LEED (Leadership in Energy and Environmental Design): Green Building Rating System Reference Package For New Construction and Major Renovations.
1.4
SUBMITTALS
A.
Submit under provisions of Section 01 30 00 - Administrative Requirements.
B.
Product Data: Manufacturer's data sheets on each product to be used, including:
1.
Preparation instructions and recommendations.
2.
Storage and handling requirements and recommendations.
3.
Installation methods.
C.
Shop Drawings: Submit dimensioned drawings showing:
1.
Material thicknesses, location and size of adhesive vent perforations;
2.
Location and size of holes for mechanical fasteners;
3.
Physical properties of each unit specified including minimum and maximum height adjustments;
4.
Layout information showing span between units for maximum loading.
D.
Verification Samples: For each finish product specified, two samples, minimum size 6 inches (150 mm) square representing actual product, color, and patterns.
E.
Manufacturer's written Instructions, including:
1.
Delivery, storage and handling recommendations.
2.
Preparation and installation recommendations.
F.
Test Reports: Certified test reports showing compliance with specified performance characteristics and physical properties.
G.
Certificates: Product certificates signed by manufacturer certifying materials comply with specified performance characteristics and criteria, and physical requirements.
H.
Manufacturer's Field Reports: Submit manufacturer's field reports within 3 days of each manufacturer representative's site visit and inspection.
 
** NOTE TO SPECIFIER ** Coordinate Article below with Contract Conditions and with Section 01 78 36 - Warranties.
 
I.
Installer's Experience: Submit verification of evidence of work similar to the work of this Section.
J.
Warranty: Fully executed, issued in Owner's name, and registered with manufacturer, including:
1.
Manufacturer's 10-year warranty, from date of substantial completion, covering defects in materials.
 
** NOTE TO SPECIFIER ** Retain the following only if specifying for a LEED project. Specify only the technical submittal requirements necessary to achieve the credits desired for this Project.
 
K.
Sustainable Design (LEED) Submittals:
1.
LEED Submittals: In accordance with Division 1.
2.
Submit verification for items when appropriate as follows:
a.
MR 4.4 for Low-Emitting Materials.
b.
MR 5.1 and MR 5.2 for Regional Materials;
1.5
CLOSEOUT SUBMITTALS
A.
Operation and Maintenance Data: Supply maintenance data for rooftop support system for incorporation into manual specified in Division 01.
B.
Record Documentation: In accordance with Division 01.
1.
Materials: List materials used in rooftop support system work.
2.
Warranty: Submit warranty documents specified.
1.6
QUALITY ASSURANCE
A.
Manufacturer Qualifications: Minimum 5 year experience manufacturing similar products.
B.
Installer Qualifications: Minimum 2 year experience installing similar products.
 
** NOTE TO SPECIFIER ** Include a mock-up if the project size and/or quality warrant taking such a precaution. The following is one example of how a mock-up on a large project might be specified. When deciding on the extent of the mock-up, consider all the major different types of work on the project.
 
C.
Mock-Up: Provide a mock-up for evaluation of surface preparation techniques and application workmanship.
1.
Finish areas designated by Architect.
2.
Do not proceed with remaining work until workmanship is approved by Architect.
3.
Rebuild mock-up area as required to produce acceptable work.
1.7
PRE-INSTALLATION MEETINGS
A.
Convene a pre-installation meeting a minimum two weeks prior to starting work of this section.
1.8
DELIVERY, STORAGE, AND HANDLING
A.
Deliver materials in accordance with manufacturer's written instructions.
1.
Deliver materials with identification labels intact and product name and manufacturer clearly visible, and in sizes to suit project.
2.
Inspect each unit for damage and promptly contact Green Link, Inc. directly to report damaged units.
3.
Ensure damaged units are replaced with new before beginning installation.
B.
Store materials in manufacturer's unopened packaging until ready for installation.
1.9
PROJECT CONDITIONS
A.
Maintain environmental conditions (temperature, humidity, and ventilation) within limits recommended by manufacturer for optimum results. Do not install products under environmental conditions outside manufacturer's recommended limits.
1.10
SEQUENCING
A.
Ensure that products of this section are supplied to affected trades in time to prevent interruption of construction progress.
1.11
WARRANTY
A.
Manufacturer's Warranty: Submit manufacturer's standard limited 10-year warranty document.
PART 2 PRODUCTS
 
2.1
MANUFACTURERS
A.
Acceptable Manufacturer: Green Link, Inc., which is located at: 5519 E, Cork St.; Kalamazoo, MI 49048; Toll Free Tel: 888-672-9897 ; Tel: 269-216-9229 ; Email: request info (dana@greenlinkengineering.com); Web: www.greenlinkengineering.com
 
** NOTE TO SPECIFIER ** Delete one of the following two paragraphs; coordinate with requirements of Division 1 section on product options and substitutions.
 
B.
Substitutions: Not permitted.
C.
Requests for substitutions will be considered in accordance with provisions of Section 01 60 00 - Product Requirements.
2.2
DESCRIPTION
A.
Adjustable height molded fibreglass-reinforced nylon support system for pipes, struts and frames intended for exterior rooftop applications.
1.
Materials: High tensile strength fiberglass-reinforced injection-molded nylon resin to ASTM D4066.
2.
Base: 7 inches (178 mm) diameter with adhesive vent perforations.
3.
Head: To suit configuration of supported materials.
4.
Finish: Grey matte finish.
5.
Maximum Loading: 600 pounds per support.
6.
Comply with UL 746A and UL 746B.
2.3
PERFORMANCE REQUIREMENTS
A.
Products shall comply with the following:
1.
Comply with ASTM C1289 and ASTM D2863.
2.
Fire Hazard Testing: To IEC 60695-2-12.
3.
Electrical Strength of Insulating Materials: To IEC 60243.
4.
Water Absorption: To ISO 62.
5.
Deflection Under Load: To ISO 75-1.
6.
Impact Strength: To ISO 180.
7.
Shrinkage: To ISO 294-4.
8.
Softening Temperature: To ISO 306.
9.
Tensile Strength: To ISO 527.
10.
Density: To ISO 1183.
11.
Melting Temperature: To ISO 3146.
12.
Linear Thermal Expansion: To ISO 11359.
2.4
MODELS
 
** NOTE TO SPECIFIER ** Use the following Paragraph to specify supports for small condensation pipes from air conditioning units or for electrical conduits. These units are most compatible with a single 1.315 inches (33.4 mm) outside diameter pipe or two 0.840 inch (21.3 mm) outside diameter pipes.
 
A.
Light Piping Support:
1.
Acceptable Material: Green Link, Inc., KnuckleHead Lite Pipe Support System.
 
** NOTE TO SPECIFIER ** Use the following Paragraph to specify supports for pipework up to and including 3 inches (76 mm) outside diameter.
 
B.
Heavy Piping Support:
1.
Acceptable Material: Green Link, Inc., KnuckleHead Heavy Pipe Support System.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when specifying supports which must accommodate square steel channels which may in turn support piping, HVAC equipment, metal walkways, solar arrays or other rooftop equipment.
 
C.
Strut Support:
1.
Acceptable Material: Green Link, Inc., KnuckleHead Strut Support System.
 
Specifier Note: Use the following Paragraph when an angled structure for the support of roof mounted solar panels is required. The head is designed to position framing up to 1 5/8 inch at a fixed 15 degrees angle. Each head is capable of resisting up to 750 pounds of wind uplift force.
 
D.
Solar Panel Framing Support:
1.
Acceptable Material: Green Link, Inc., KnuckleHead Solar Support System.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when there is a requirement to construct a raised flooring that protects the roofing membrane and other components from foot traffic. This support can be used with a concrete paver system or composite decking to create access flooring, garden terraces or plaza decks.
 
E.
Paver Support:
1.
Acceptable Material: Green Link, Inc., KnuckleHead Paver Support System.
2.5
ACCESSORlES
A.
Adhesive: Contact manufacturer for recommended adhesive to maintain warranty.
1.
Acceptable Materials: Green Link Adhesive/Sealant.
B.
Mechanical Fasteners:
1.
To suit roof deck and in accordance with support manufacturer's written recommendations.
C.
Support Extension Kit: Consisting of extension cylinder, threaded rod and threaded coupling.
 
** NOTE TO SPECIFIER ** Retain and edit the following Paragraph to specify the number of extension kits that are required. If more than one size of kit is required, repeat the following Paragraph for each extension kit size needed.
 
1.
Number of 8 inches (203 mm) extension kits required: ______.
2.
Number of 12 inches (305 mm) extension kits required: ______.
3.
Number of 18 inches (457 mm) extension kits required: ______.
4.
Acceptable Material: Green Link, Inc., KnuckleHead Support Extension Kit.
D.
Cleaning Solvent: Denatured alcohol solvent or other cleaning agent acceptable to both support manufacturer and roofing manufacturer.
E.
Halo Target Flashing: To maintain warranty of various roofing systems. To be installed by the same contractor that installs the roofing system when Knuckleheads are mechanically attached.
F.
TPO Primer: To be used according to used when adhesive and/or mechanical attachment and TPO membrane is present. Contact manufacturer for specific instructions.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when a mechanical retainer is required to keep pipes from dislodging from the piping support or from strut framing members.
 
G.
Mechanical Retainers: to retain plumbing inside the support and prevent dislodgment.
1.
Caps: use with Light Piping Support (2.4-A).
2.
Straps: use with Heavy Piping Support (2.4-B).
3.
Clips: use with Strut Channel Framing and Strut Support (2.4-C).
4.
Acceptable Material: Green Link, Inc., KnuckleHead Retainer System.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when slip sheets or protective membrane is required to isolate roofing system from the mechanical component support system.
 
H.
Protective Pad: Plasticizer Free pad is used as a slip sheet under the KnuckleHead system to isolate it from the single ply membrane systems, to dampen vibration and to mitigate slippage.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when additional solar energy collection angle is required for rooftop mounted solar array.
 
I.
Solar Wedge: 5-degree wedge is used to increase or decrease angle to provide 10 or 20 degree angle of attack. Use with Par. 2.4D Solar KnuckleHead.
1.
Acceptable Material: Green Link, Inc., KnuckleHead Solar Support System.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when dampening is required to mitigate vibrations of rooftop plaza decks, patios and walkways associated with live loads or other conditions.
 
J.
Paver Pad: Use with Paver Support (2.4 E).
1.
Acceptable Material: Green Link, Inc., KnuckleHead vibration dampening elastomer.
PART 3 EXECUTION
 
3.1
EXAMINATION
A.
Verification of Conditions: Verify that conditions of roofing surface substrate previously installed under other Sections or Contracts are acceptable for rooftop support system installation in accordance with manufacturer's written recommendations.
1.
Visually inspect roofing surface substrate in presence of Architect.
2.
Ensure roofing surface substrate is sound, clean, dry and free of contaminants and other deleterious materials.
3.
Inform Architect of unacceptable conditions immediately upon discovery.
4.
Proceed with installation only after unacceptable conditions have been remedied and after receipt of written approval to proceed from Architect.
5.
Starting installation of rooftop support system implies roofing surface substrate conditions are acceptable for Work of this Section.
3.2
INSTALLATION
A.
Install support system in accordance with manufacturer's written recommendations.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
B.
Loose-Laid Support System:
1.
Lay support bases in required pattern and spaced to ensure that no single support will be exposed to loads greater than 600 pounds.
 
** NOTE TO SPECIFIER ** Retain and edit the following Paragraph to meet project requirements. For Suggested Maximum Support Intervals for various types and weights of piping, visit the "TECHNICAL" portion of the Green Link, Inc. website at www.greenlinkengineering.com or contact Green Link, Inc. directly.
 
a.
Support spacing: As indicated.
b.
Support spacing: 6 feet (1829 mm) maximum.
c.
Support spacing: 9 feet (2743 mm) maximum.
d.
Support spacing: 10 feet (3048 mm) maximum.
e.
Support spacing: 11 feet (3353 mm) maximum.
f.
Support spacing: 12 feet (3658 mm) maximum.
g.
Support spacing: 13 feet (3962 mm) maximum.
h.
Support spacing: 14 feet (4267 mm) maximum.
i.
Support spacing: 15 feet (4572 mm) maximum.
j.
Support spacing: 16 feet (4877 mm) maximum.
k.
Support spacing: 17 feet (5182 mm) maximum.
l.
Support spacing: ____ feet maximum.
 
** NOTE TO SPECIFIER ** Retain and edit the following Paragraph to meet the type of support head and support system specified.
 
2.
Screw support head to suit support system on to base and level as required for support system indicated.
a.
Rotate support head to desired height.
b.
Ensure support head is not elevated above "STOP" mark to maintain minimal required thread engagement.
3.
Install supporting work in accordance with manufacturer's written recommendations.
 
** NOTE TO SPECIFIER ** Delete if not required.
 
C.
Adhered Support System:
1.
Loose lay complete assembly to establish layout of supports ensuring that no single support will be exposed to loads greater than 600 pounds.
 
** NOTE TO SPECIFIER ** Retain and edit the following Paragraph to meet project requirements. For Suggested Maximum Support Intervals for various types and weights of piping, visit the "TECHNICAL" portion of the Green Link, Inc. website at www.greenlinkengineering.com or contact Green Link, Inc. directly.
 
a.
Support spacing: As indicated.
b.
Support spacing: 6 feet (1829 mm) maximum.
c.
Support spacing: 9 feet (2743 mm) maximum.
d.
Support spacing: 10 feet (3048 mm) maximum.
e.
Support spacing: 11 feet (3353 mm) maximum.
f.
Support spacing: 12 feet (3658 mm) maximum.
g.
Support spacing: 13 feet (3962 mm) maximum.
h.
Support spacing: 14 feet (4267 mm) maximum.
i.
Support spacing: 15 feet (4572 mm) maximum.
j.
Support spacing: 16 feet (4877 mm) maximum.
k.
Support spacing: 17 feet (5182 mm) maximum.
l.
Support spacing: ____ feet maximum.
2.
Mark location of each support.
3.
Clean area of roof where support will be placed in accordance with manufacturer's written recommendations.
4.
Apply adhesive to bottom of support based using notched trowel.
5.
Cover entire surface of base with adhesive 60 mil thick.
6.
Position base in marked area and press gently ensuring adhesive oozes from vent holes.
a.
Ensure base is in final position within 20 minutes of applying adhesive.
 
** NOTE TO SPECIFIER ** Retain and edit the following Paragraph to meet the type of support head and support system specified.
 
7.
Screw support head to suit support system on to base and level as required for support system indicated.
a.
Rotate support head to desired height.
b.
Ensure support head is not elevated above "STOP" mark to maintain minimal required thread engagement.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when pipes, struts or framing are to be loose laid.
 
8.
Place supported work into support head using light steady pressure.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when pipes, struts or framing are to be bonded to the support head.
 
9.
Completely cover support at area of contact between support head and supported work with adhesive before setting in place.
a.
Remove excess adhesive immediately after supported work has been put into final position.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when struts or framing are to be bonded to the support head as well as mechanically fastened.
 
b.
Secure framing to support head using all-purpose mechanical fasteners in accordance with manufacturer's written recommendations.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when struts or framing is to be installed using mechanical fasteners.
 
D.
For Mechanically Fastened Support System:
1.
Loose lay complete assembly to establish layout of supports ensuring that no single support will be exposed to loads greater than 600 pounds.
 
** NOTE TO SPECIFIER ** Retain and edit the following Paragraph to meet project requirements. For Suggested Maximum Support Intervals for various types and weights of piping, visit the "TECHNICAL" portion of the Green Link, Inc. website at www.greenlinkengineering.com or contact Green Link, Inc. directly.
 
a.
Support spacing: As indicated.
b.
Support spacing: 6 feet (1829 mm) maximum.
c.
Support spacing: 9 feet (2743 mm) maximum.
d.
Support spacing: 10 feet (3048 mm) maximum.
e.
Support spacing: 11 feet (3353 mm) maximum.
f.
Support spacing: 12 feet (3658 mm) maximum.
g.
Support spacing: 13 feet (3962 mm) maximum.
h.
Support spacing: 14 feet (4267 mm) maximum.
i.
Support spacing: 15 feet (4572 mm) maximum.
j.
Support spacing: 16 feet (4877 mm) maximum.
k.
Support spacing: 17 feet (5182 mm) maximum.
l.
Support spacing: ____ feet maximum.
2.
Clean area of roof where support will be placed in accordance with manufacturer's written recommendations.
3.
Position base in marked area and mechanically fasten base to roof using appropriate fasteners in accordance with manufacturer's written recommendations.
 
** NOTE TO SPECIFIER ** Retain and edit the following Paragraph to meet the type of support head and support system specified.
 
4.
Screw support head to suit support system on to base and level as required for support system indicated.
a.
Rotate support head to desired height.
b.
Ensure support head is not elevated above "STOP" mark to maintain minimal required thread engagement.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when pipes, struts or framing are to be loose laid.
 
5.
Place supported work into support head using light steady pressure.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when pipes, struts or framing are to be bonded to the support head.
 
6.
Completely cover support at area of contact between support head and supported work with adhesive before setting in place.
a.
Remove excess adhesive immediately after supported work has been put into final position.
 
** NOTE TO SPECIFIER ** Use the following Paragraph when struts or framing are to be bonded to the support head as well as mechanically fastened.
 
b.
Secure supported work to support head using all-purpose mechanical fasteners in accordance with manufacturer's written recommendations.
3.3
FIELD QUALITY CONTROL
 
** NOTE TO SPECIFIER ** Specify requirements if manufacturers are to provide field quality control with onsite personnel for instruction or supervision of product installation, erection, or construction. Manufacturer field reports are included under PART 1, Submittals.
 
A.
Manufacturer's Services:
 
** NOTE TO SPECIFIER ** Use the following Paragraphs only when manufacture's field services are provided and are required to verify the quality of the installed components. Establish the number and duration of periodic site visits required by manufacturer and specify below. Contact Green Link, Inc. to determine any costs associated with Technical Representatives providing manufacturer's field services. Delete if field services are not required.
 
1.
Coordinate manufacturer's services with Division 01.
 
** NOTE TO SPECIFIER ** Delete the following paragraph if no costs are associated with manufacturer's services.
 
2.
Arrange for payment for manufacturer's services.
3.
Have manufacturer review work involved in handling, storage and installation of rooftop support system, and submit written reports in acceptable format to verify compliance of Work with Contract conditions.
4.
Manufacturer's Field Services: Provide manufacturer's field services consisting of product use recommendations and periodic site visits for product installation review in accordance with manufacturer's instructions.
a.
Report any inconsistencies from manufacturer's recommendations immediately to Architect.
 
** NOTE TO SPECIFIER ** Edit the following Paragraph to meet project requirements. Coordinate site visits with manufacturer or delete the Paragraph and all of its subparagraphs if site visits are not required.
 
5.
Schedule site visits to review work at stages listed:
a.
After delivery and storage of rooftop support system components, and when preparatory work on which Work of this Section depends is complete, but before application begins.
b.
During progress of work.
c.
Upon completion of Work, after cleaning is carried out.
d.
Obtain reports within three days of review and submit immediately to Architect.
3.4
CLEANING
A.
Perform daily progress cleaning. Remove all dirt, oil, loose paint, frost and other contamination from all working surfaces with alcohol. Do not use petroleum solvents such as mineral spirits or xylene.
1.
Leave work area clean at end of each day.
2.
Immediately clean spilled adhesive.
B.
Upon completion, remove surplus materials, rubbish, tools and equipment.
C.
Collect recyclable waste and dispose of in accordance with manufacturer's written recommendations and at appropriate recycling facilities.
 
** NOTE TO SPECIFIER ** Specify protection methods completed after installation, but prior to acceptance by the owner. Include only statements unique to this Section. Coordinate the following Article with Section 01 76 00 - Protecting Installed Construction.
 
3.5
PROTECTION
A.
Protect installed rooftop support system from damage during construction.
B.
Repair or replace adjacent materials damaged by installation of rooftop support system.
END OF SECTION