The Weekly is STREAMING now. Join us at HorizonTV

Deluge Sprinklers are not as affordable as you think - especially when it compromises safety

Sponsored content
April 10, 2018 |
Bill O'Keeffe

A couple of weeks ago, we saw an article published by TYCO, a sprinkler manufacturer, pushing for their alternate 1-2 hour wall assembly using their special purpose deluge sprinkler and tempered glass.  In the article, they make the case that tempered glass and deluge sprinklers are cheaper compared to 1-2 hour fire resistive glazing assemblies.  However, their estimate only referenced the cost of a couple of sprinkler heads and tempered glass – what they fail to tell the buyer (or the architect) is that there are plenty of hidden costs and safety risks to this assembly. 

So before going through the AHJ approval process for this alternate assembly using deluge sprinklers, I’d like to point out a few concerns to help you make an informed decision.  I am comparing this this to readily available, USA-made, 1-2 hour fire resistive glazing assemblies that do not need prior AHJ approval.


1. Architects assume all responsibilities and costs of applying for AHJ approval.  This includes, but not limited to, the following:



2.  Architects and/or building owners are assuming unnecessary safety risks and liabilities when relying on deluge sprinklers for the safety of building occupants. 

Other than following the time and temperature curve, there is nothing that resembles the original ASTM E-119 test for deluge sprinklers with fixed glazed assemblies. There is no cotton waste test, there is no hose stream test, and there is no documented report showing how it provides radiant heat protection by limiting the temperature rise on the non-fire side to less than 250 degrees F over ambient.

The possibility of sprinkler failure also poses a real threat to building occupants.  No sprinkler manufacturer or installer will guarantee that it will work 100% of the time.  When the sprinklers fail to operate, the non-rated glass will be useless in preventing fire, smoke and dangerous radiant heat from spreading.  Building occupants are no longer protected, and safe egress becomes almost impossible.  Wetting the surface of heat-strengthened glass or tempered glass may prevent thermal shock and compartmentalize smoke and flames, but it won’t prevent the passage of radiant heat.  Ceramics may be able to resist cracking or shattering at high temperatures because it is an excellent conductor of heat.  This is why it is widely used as cooktops, and why the IBC limits its use to fire protective applications only because it does not limit radiant heat whatsoever.


3.  There are several design restrictions for special-purpose deluge sprinklers used with fixed glazed assemblies. This includes, but not limited to, the following:



After comparing the hidden costs, safety risks and design restrictions on special purpose deluge sprinklers that requires prior AHJ approval vs. already approved 1-2 fire resistive assemblies, it is clear to see that merely looking at this in terms of ‘a few sprinkler heads and tempered glass’ exposes the designer and building owner to various costs and liabilities.  For more information, visit  

Bill O'Keeffe | Clear on Technical Glass
SAFTI FIRST Fire Rated Glazing Solutions

About the Author: Bill O’Keeffe is the President and CEO of SAFTI FIRST Fire Rated Glazing Solutions, a leading USA-manufacturer of advanced fire rated glass and framing systems.  An industry veteran and innovator with over 45 years of experience in architectural glazing, he was first to introduce and manufacture clear, fire resistive glazing products in the US.  He is also a safety advocate who exposed the dangers of traditional wired glass, which lead to code changes and fire rated glass products that are safe, affordable and clear alternatives to traditional wired glass.  Today, Bill continues to develop building products that enable architects to create beautiful, safe and energy-efficient spaces with advanced glazing systems.

Related Blogs

The 2012 and 2015 IBC closed an important loophole that allowed uncontrolled radiant heat transmission through vision lites in doors in exit enclosures and exit passageways. Today, fire protective ceramics are limited to 100 sq. in. in the door vision panel regardless if the building is fully sprinklered. To exceed 100 sq. in., fire resistive glazing that meets ASTM E-119/UL 263 must be used. 

January 23, 2018 | Fire-Rated Products | Clear on Technical Glass

Fire rated glass fencing can help slow the spread of fire by blocking smoke and flames up to 60 minutes.  It also provides partial radiant heat protection by reflecting the heat back to the fire source.

December 18, 2017 | Security/Fire Protection | Clear on Technical Glass

A reflection on 2017 and a look at what's to come in the new year.

October 25, 2017 | Fire-Rated Products | Clear on Technical Glass

To avoid confusion, we are proposing separate charts for fire protective and fire resistive products.

Fire protective glazing used in a door vision panel in 60-90 minute exit stairway

The 2012 and 2015 IBC limits the size of ceramics and fire protective glazing used in the door vision panel in 60-90 minute exit stairway or passageways to 100 sq. in. regardless if the building is fully sprinklered. The only way to exceed the 100 sq. in. vision panel limitation is by using fire resistive glazing that meets ASTM E-119. 

July 19, 2017 | Fire-Rated Products | Clear on Technical Glass

As shocking as the Grenfell Tower fire was, it is not an isolated incident.

June 13, 2017 | Fire-Rated Products | Clear on Technical Glass

The ASTM E-119 test is the most stringent and most difficult test to pass for all fire rated glazing assemb...

GPX Hurricane with FL Product Approval was used in the new VA Medical Center in Orlando, FL.  Architect: RLF Architects.  Glazier: Harmon Inc. Photo Credit:  SAFTI FIRST

March 22, 2017 | Fire-Rated Products | Clear on Technical Glass

It may look like a regular window, but these advanced fire resistive glazing systems are recognized in the...

January 03, 2017 | Glass and Glazing | Clear on Technical Glass

Our mission is to produce appealing architectural products that protect people while providing our customer...

November 10, 2016 | Fire-Rated Products | Clear on Technical Glass

SuperLite II-XLM is a fire resistive multi-laminate glass product that meets ASTM E-119/UL 263/NFPA 251 and...

Overlay Init

Your card will be charged: 0