BRS :: Trapezoidal Panel
Building Research Systems, Inc.

Trapezoidal Panel


Most standing seam roof systems on the market
today are adoptions of 1970 technology. 

The Market has changed substantially 
in the last 40 years. 

The BRS TS-324 roof system was developed in response to these changes and provides a manufacturer and economical solution to the higher wind loads and longer spans the industry now demands.

The BRS TS-324 roof system designed for the 21st century consisting of:

One Panel profile with three seams.

1.Seam not requiring an electric seamer competing with existing snap together panels
2.Seam with higher wind and water performance than double lock panels on the market
3. Seam providing high velocity wind performance without the use of S5 or any other external clamps

Four patented clip options each with higher uplift ratings.  ClipsOnPanel.jpg

Eliminates the need to reduce spans or provide external clamps  

4” Standard

8” wind clip 

12” wind clip 

16” wind clip 


Economically accommodating higher wind uplift requirements of zoned loads. 

ASCE 7 divides the roof into three zones of uplift load zones.jpg

• Zone I amounts to about 80%

• Zone II represents about 15%

• Zone III are about 5%





TS-324 Roof System is designed around one panel profile that will out-perform existing snap together panels and field seam panels without the addition of external U5 clamps.

This flexibility is accomplished by simply changing the field seaming method.

panelprofile.jpg         PanelPhoto.jpg

Consider the benefits of offering all three seams:

By adopting the complete TS-324 system as your standing seam roof will have a SSR system with the highest performance of any on the market and be in a position to offer it at a lower cost than other systems.

Some of the High Performance credentials that BRS Licensees have achieved are:

• Florida High Velocity and Broward/Dade County ratings higher than other systems
• Highest FM classifications with shorter spans using 24 gauge panels
• Higher ASTM E 1592 loads than others in the industry even those using seam clamps
• Superior weather tightness due to the TripleLok and QuadLok seam configurations
• Longer panel runs without fixing at center of span or using step in slope details
• Ability to compete with the snap-together SSR roof projects with same profile 

Key features of the TS-324 system that provide benefits to you and your Dealer/Builders

• Improved Patented Panel Seam
• Patent Pending Panel Clips
• Proven Accessories


One Panel - Three Seams

The TS-324 panel is one panel profile that can be installed using one or more of three seams.


Seam 1 - RollLok

The RollLok seam is crimped at the panel clips only. The weather tightness and wind uplift ratings are superior to existing snap together panels.

Seam Crimping is accomplished with a $200.00 stand up hand crimper. This process can be accomplished with less time than snapping seams on a snap-together panel.


Seam 2 - TripleLok™

The TripleLok seam is accomplished with an electric seamer making a single pass at 30 feet per minute. The seamer can seam in both directions (up slope then down slope).



The TripleLok seam is essentially a Double Lock seam rotated 90 degrees, thus reducing prying forces that the double lock seam would receive during uplift loads.


Because of the additional forming, the TripleLok resists separation from the clip much longer than the Double Lock Seam.


Seam 3 - QuadLok™

The QuadLok seam is accomplished with an electric seamer making two passes along the seam by semaing up the slope then down the slope over the same seam.

The QuadLok seam is the TripleLok seam rotated down 90 Degrees to further reinforce the seam resistance to unfurling under load.




Compare TS-324 ASTM E 1592 Loads with other SSR systems 
(without seam clamps)

Seam 1 - RollLok compared to snap-together systems

Span TS-324 RollLok Brand M
2'-0" 61.1 58.3
5'-0" 28.3 23.1

To obtain design loads equal to RollLok systems, Brand M would have spans as shown below

TS-324 RollLok Brand M
61.1 58.3
28.3 23.1

 Seam 2 - TripleLok with 8" wind clip compared to Bouble Lock systems

Span TS-324 TripleLok Brand M Brand B Brand V
2'-0" 106.0 79.0 68.0 65.0
5'-0" 51.9 40.8 31.0 39.0

To obtain design loads equal to TS-324, other manufacturers will have to reduce spans as shown below

TS-324 TripleLok Brand M Brand B Brand V
2'-0" 1'-6" 1'-6" est. 1'-6" est
5'-0" 3'-9" 3'-0" 3'-4"


Seam 3 - QuadLok compared to other Double Lock systems

Span TS-324 QuadLok Brand M Brand B Brand V
2'-0" 108 79.0 68.0 65.0
5'-0" 54 40.8 31.0 39.0

To obtain design loads equal to TS-324, other manufacturers will have to reduce spans as shown below

TS-324 QuadLok Brand M Brand B Brand V
2'-0" Below 1' Below 1' Below 1'
5'-0" 3'-8" 3'-0" 3'-3"




 12" wind clip with TS-324 QuadLok seam provides higher uplift loads than double lock, even with wind clamps.

Span TS-324 QuadLok 12" wind clip Brand M Brand B Brand V
2'-0" 183 psf 135 psf 104 psf 99 psf
5'-0" 84 psf 61.1 psf 42 psf 52 psf




 Note: Loads are shown with a safety factor of 1.7

Compare Sealant of Double Lock to QuadLok Seam
Sealant seal isolated by seam configuration during uplift forces 


Compare TripleLok Air and Water Infiltration with other SSR systems
ASTM E 1680-95 

Static Pressure
Difference (PSF) 
AirLeakage Rate
Brand M
Air Leakage Rate
Brand B
Air Leakage Rate
6.24 0.0018 0.007 Not Tested


Not Tested 0.014 0.025
30.0 0.042 Not Tested Not Tested
40.0 0.0046 Not Tested Not Tested