No Holes
No Leaks
No Worries

Gravity Barriers are a flexible way to achieve effective rooftop screening without the need for building penetration. Our fully customizable barrier systems are designed to meet the requirements of any project, no matter the size or scope.

​Parklane Gravity Barriers

The Parklane Gravity Barrier system is a self-supporting solution that can be designed to eliminate or drastically reduce any rigid connection to a building’s roof structure. During installation, this eliminates any disruption into the occupied space below. Post-installation, it prevents future risk of roof leaks.

The choice of architects: Our structurally self-supporting
screen system can be customized to suit any design.


Gravity Barriers offer an effective and elegant solution to complex rooftop screening challenges. Our standardized modular frame design allows for expedited installation timelines and mitigates the risk of delays, all while reducing the on-site congestion of trades professionals.

501 Lakeshore

Architectural Flexibility

Parklane is able to integrate any commercially available architectural cladding system to the modular framework. This provides architects with complete flexibility to ensure aesthetic alignment of the system, allowing them to blend the Gravity Barrier into the building façade.

Sound Control or Screening

Gravity Barriers can be easily interchanged between a standard architectural screen and an absorptive sound barrier. Acoustic elements are tested as per ASTM E90-9 (transmission loss) and ASTM C423-17 (sound absorption), and are rated for exterior application.

Gravity Barrier
Gravity Barrier

Dimensional Flexibility

As a self-supporting system, the Gravity Barrier can be designed to adhere to any footprint requirements and geometric configurations. This ensures OEM mechanical clearances are satisfied and rooftop obstructions are avoided.

How Gravity Barriers work—and how they can simplify your rooftop screening challenges.

Supported through detailed non-linear analysis, we use a combination of dead-load frictional resistance and specific moment-arm lengths to resist sliding and overturning of our barrier system. To support our design, we’ve developed a field-tested library of friction coefficients with various roofing systems and bonded membrane materials.

Transfer load locations can be designed to optimize the available capacity in the building’s roof structure. For larger height requirements or excessive wind-load conditions, the free-standing design can be coupled with strategically-placed rigid connection points for an optimized hybrid approach.

“Parklane Mechanical Acoustics were professional, exceptionally organized and collaborated with us to design and install the most economical roof screening available. We highly recommend their services for roof screening and look forward to working with them on future projects.”

Shawn E. Turcotte, P.Eng. | Chief Operating Officer

Structural Design Considerations

  • Roof Structure Capacity
  • Environmental Load Conditions (namely wind)
  • Building Height
  • Geographic Location
  • Frame Rigidity
  • Resistance to Sliding
  • Resistance to Overturning

Sliding Resistance

  • Footing membrane selected based on roof
    membrane type 
  • Establish optimal system weight

Overturn Resistance

For elevated heights or short wing walls, moment arm can be lengthened to produce higher overturning resistance.


  • If gravity loads are too high, fixed anchorage points can be carefully selected. This could be to the existing building structure or the base channel of the mechanical unit

Success is in the details

The Gravity Barrier Design Process

We work with industry, architects, acoustic engineers, consultants and contractors to develop effective screen system solutions.

We can provide our systems as a supply-only scope to the general contractor, or can self-perform the installation with our internal trade resources and installation teams. No matter the requirement, we can customize our solutions to suit any project need.

Here’s a brief overview of how our Gravity Barriers systems are designed, produced and installed.

Step #1 Layout

We’ll work with the architect or consultant to determine the layout and height requirements for the screen system. Considerations such as service clearances and sightlines are then reviewed to finalize the desired screen geometry.

Step #3 Aesthetics

We’ll work with the architect and/or building owner to select the desired façade product for the screen system. An architectural render of the proposed system is then provided for client review to ensure aesthetic fit and alignment.

Step #2 Structural

Our team will review the existing structure to determine the most practical locations for load transfer to the roof deck. Transfer loads are provided to the consultant for review, then optimized through a collaborative design overview.

Step #4 Specification

A basis-of-design specification is provided for incorporation into the project bid documents. We then prepare and submit a formal set of detailed general arrangement drawings sealed by a professional engineer in the jurisdiction where the installation takes place.

Case Study

501 Lakeshore

501 Lakeshore Rd

Because mechanical noise issues should never be a distraction

Contact a member of our team now to find out how Parklane can help provide an effective, customized solution to your organization’s noise control challenges.