CMD Group is a ConstructConnect® company. Learn more

5519 East Cork Street
Kalamazoo, MI 49048
(269) 216-9229
(888) 672-9897
03 00 00 - Concrete
04 00 00 - Masonry
05 00 00 - Metals
07 72 00 - Roof Accessories
08 00 00 - Openings
09 00 00 - Finishes
10 00 00 - Specialties
11 00 00 - Equipment
12 00 00 - Furnishings
21 00 00 - Fire Suppression
22 00 00 - Plumbing
23 00 00 - HVAC
26 00 00 - Electrical
27 00 00 - Communications
31 00 00 - Earthwork
33 00 00 - Utilities
34 00 00 - Transportation

KnuckleHead Rooftop Support System

Product Overview

KnuckleHeads are tough, molded fiberglass-reinforced nylon supports designed to keep equipment elevated to extend a roof’s life. KnuckleHeads are intended to be used on low-slope rooftops.

KnuckleHeads are height-adjustable and are designed to support up to 600 pounds of weight each. Units can be spaced in such a way as to evenly distribute the load of the heaviest equipment. Consult Green Link, Inc. technical resource guide here for optimal spacing per each application. Unlike heavy ballast stones, KnuckleHeads are lightweight, adding little to the total roof load, and preventing low points or depressions that invite ponding water and ice build-up.

KnuckleHead installations have been performing in the field for more than 10 years. After constant exposure to high temperatures, freeze-thaw cycles, UV exposure and mechanical stress they show no signs of deterioration.

KnuckleHeads will prevent damage caused by pond water, wind, ice, flying debris or seismic events as well as protect the integrity of the roofing system—including roof-mounted structures and equipment.

They are engineered with a Universal Base. A range of head designs are available depending on the particular support application needed.

A 10-year warranty is available.

Five KnuckleHead designs are available depending on the application. Regardless of the design, all KnuckleHeads utilize the same Universal Base and install using the same steps. They can be installed using Chem Link M-1® Structural Adhesive/Sealant, or M-1 combined with mechanical fasteners.

Lite Pipe Support System

KnuckleHead Lite Pipe Supports are commonly used for condensation pipes and electrical conduit. They are compatible with a single 1.315 inch round outside diameter pipe or two 0.840 inch round outside diameter pipes.

Heavy Pipe Support System

KnuckleHead Heavy Pipe Supports can support pipes up to 3 inches round outside diameter such as PVC or natural gas lines.

Strut Support System

KnuckleHead Strut Supports are designed for a wide variety of applications including solar arrays, air conditioning units, oversized pipes, and other equipment that is to be positioned on commercial roofs. Strut supports are designed to accommodate standard steel channel which can provide a framework for keeping equipment elevated from the roof’s surface.

Solar Support System

KnuckleHead Solar Supports provide an angled structure for roof-mounted solar panels. The head is designed to position framing up to 158 inch at a fixed fifteen degree angle. Each head is capable of resisting up to 750 pounds of wind uplift force.

Paver Support System

KnuckleHead Paver Supports are designed for a wide variety of mechanical support applications including plaza decks, ballast, access flooring, roof walkways and similar applications. Paver supports are lightweight, so they add little to total roof load, preventing low points and depressions that invite ponding water and ice build-up.

Chem Link M-1® Polyether Structural Adhesive/Sealant

KnuckleHeads can be attached directly to the roof substrate with mechanical fasteners combined with Chem Link M-1 Structural Adhesive/Sealant, or with M-1 alone. M-1 is polyether-based and bonds to a wide range of roofing substrates as well as to wood, concrete, metal and the KnuckleHead nylon base. M-1 by itself develops a strong bond of more than 400 psi shear strength, which contributes to KnuckleHead integrity under high wind conditions or seismic events.

Safety Yellow Straps, Caps and Accessories

Where high winds or seismic events are present or where code requires it, pipes and struts can be secured in KnuckleHead rooftop supports with custom engineered straps or caps molded from tough, weatherproof urethane, tinted “safety yellow.”

Technical Specifications:

SpecData datasheets available for downloadMANU-SPEC 3-Part Specifications

GLE_07 72 00_MS_KnuckleHeads_2017_r3a 

SpecData datasheets available for downloadSPEC-DATA Technical Datasheets

GLE_07 72 00_SD_Knuckleheads_2017_r3

SpecData datasheets available for downloadManufacturer Specifications (Guide Specs)


Associated CSI Codes
  • 07 72 00
  • 07 76 00
  • 07 76 13
  • 22 05 29
  • 23 05 29
  • 26 05 29
  • 26 31 00


Get More Information

Contact Information

First name:
Last name:

Your Role in the Construction Industry


Specific Needs

Let us know what you are specifically looking for, including what type of project you are working on.

Project Type: