How ya’ feeling? Hot, hot, hot.
This is the time of year that Intech Equipment and Supply’s customer service team often receives numerous calls from customers having issues with their spray foam guns locking up, crossing over and guns spraying for a few seconds right before they stop spraying.
Unfortunately, as the summer weather gets sizzling, spray gun cross-overs tend to increase. Here are a few tips to deal with these hot weather-related issues:
Reduce Your Hose Heat
Running your hose heaters at 130° and having the hose run across 200 feet of roof deck on a hot day can simply make the chemical too hot. Think about it: in the southern regions of the U.S., most roof decks are more than 130° F during the afternoon peak.
If you start to spray and it only works for a couple of minutes before the gun locks up, it’s not the seals, its your temperatures. We have completed roofing jobs with the heaters on 90° F to spray.
Test Your Chemicals to See If They Are Too Hot
Remove the manifold assembly from the spray foam gun. With the system pressure in the “off” position, and on “jog” to circulate the fluid, open the B side shut off valve and pour a half ounce into a paper cup. If the fluid begins to froth into a foam, then you need to reduce the heat. You also may need to recirculate the fluid to get all the hot chemical out of the hose and allow time for everything to cool down some.
So, set your heater at 100° F – it’s much easier to heat up, than to cool down. This way, if the chemical is not hot enough, the reaction time will be slow or the foam will be “spongy.” Then, increase the temperature another five degrees. Chances are, if you’re spraying on a steel building or a roof deck, the surface temperature you are spraying on is at least 110-150° F and it will cause the foam to react regardless.