By Brion P. McMullen, Bio
The invention of Surebond SB-190 is responsible for making “polycarbonate” snow guards today’s most popular choice for snow avalanche control on metal roofs. Adhesive attachment is the safest and best snow stop mounting solution for metal panels that can not accept through fasteners such as floating standing seam or insulated panels. Additionally, to protect the integrity of the metal roof, many installers and designers do not wish to penetrate or clamp anything to the roof making a glue down style snow retention system the most attractive solution.
The adhesive attachment method for snow guards is the least likely to cause damage to a metal roof if the system becomes overloaded. Generally, the worst that can happen is that the guard will release harmlessly if loaded beyond it’s design capacity. The snow stop can then be reattached in the same spot without adverse affects to the roof or the guard. The release of an adhesive mounted snot stop is a very rare occurrence when used with properly designed systems that are installed at the proper time of the year. Because the shear strength of the adhesive is only as good as the surface it is attached to, adhesives should not be used on EPDM style membranes, slate, or some shingle style panels. Always check with the manufacturer of the roofing system to be certain.
Snojax, Inc. pioneered the use of Surebond SB-190 for its polycarbonate snow guards in 1986. After testing many adhesives over the years, the best performer still continues to be Surebond SB-190 due to its 2,000lbs/sq in. tensile strength, 500% elongation, and superior exterior UV resistance. Surebond SB-190 has been used successfully on Snojax snow stops in the field for over 26 years, which is a testament in itself.
The SB-190 creates a chemical bond that etches itself to the polycarbonate as it cures and is safe to use on most factory painted roof panels. Just about any properly designed, UV stabilized, virgin grade polycarbonate snow stop with a forward mounted face design can be adhered successfully to most any type of factory painted metal roofing panel where the flat surface of the panel is wide enough to accept mounting. The SB-190 adhesive is only recommend for used with polycarbonate snow guards because UV from the sun plays a crucial part in the curing process. Consumers should always review the manufacturers professional test results before choosing a particular brand of snow guards for their metal roof.
Once installed on a polycarbonate snow guard, Surebond reaches about 90% strength in 14 days of consistent temperatures above 50°F. The minimum application temperature is 50°F and at least 30 days of curing time is required to achieve a full bond strength. In temperatures less than 40°F, the curing of SB-190 simply enters a dormant state and then resumes its cure when the temperature exceeds 50°F again. This does not ruin the curing process however it will prolong the time that it takes to achieve a full cure. After nearly 30 years of manufacturing the SB-190, there is still no competing adhesive that can match the published ATI Snow Guard Test Results commissioned by SnoBlox-Snojax.
SnoBlox-Snojax has 6 different models that are professionally tested with the SB-190. Some models will fit metal panel flats as narrow as 1.5 inches and others that can straddle minor rib striations in the panel. The newer generation of patented SnoBlox and IceJax snow stops have been designed with features to make them work even better with the Surebond adhesive attachment method. The patented waffled base of the Deuce and Ace products allows the Surebond SB-190 a more efficient bonding surface and the forward mounted face design minimizes the leverage points. The engraved base of the IceJax II model will withstand an outstanding 1,500 lbs. of force per guard prior to attachment release. This is the highest published professional ATI Laboratory test result in the industry for any adhesive polycarbonate snow guard.
In conclusion, SnoBlox-Snojax polycarbonate guards mounted with SB-190 are an excellent “safe choice” for most metal roofs as long as the snow retention system is competently designed, has been professionally tested and is installed to the manufacturer’s specification. To make sure your project is a success, start a free project layout at www.SpacingTool.com or by calling one of the system designers at 1-800-SNOJAX-1.