Cold Storage of Closed Cell and Open Cell Foam

Cold weather doesn’t just make jobsites uncomfortable — it can quietly ruin your spray foam materials before you ever pull the trigger. Proper cold storage of closed cell foam and cold storage of open cell foam in barrels is one of the most overlooked factors in consistent, high-quality applications. Get it wrong and you’re dealing with off-ratio sprays, poor adhesion, and wasted product. 

The right storage temperatures for each foam type, how to prep your equipment, and the most common cold-weather mistakes that cost contractors time and money are discussed below. 

Spray foam chemistry is temperature sensitive. When material gets too cold, viscosity changes — meaning the resin and isocyanate don’t flow, mix, or react the way they should. The result? Poor cell structure, weak yields, and off-spec foam that fails in the field. 

Getting your storage conditions right before you ever load the gun is the first line of defense. 

Open cell foam stores best between 60–90°F. This is a higher range than most people expect, and it’s worth paying close attention to — especially when barrels sit in an unheated trailer overnight. 

When material drops below this range, it becomes harder to process and harder to heat evenly at the machine. 

• Target spray temps of 115–150°F, adjusting based on ambient temperature and how the foam is performing on the substrate 

• Possibly use a smaller mix chamber to keep material in the heater longer, giving it more time to reach the right temperature 

• Monitor how the foam looks as it hits the surface — visual cues tell you a lot about whether your temps are dialed in 

• Use barrel blankets to maintain drum temps in cold trailers or job sites 

• Use space heaters to warm both the substrate and the rig area before spraying 

• Check substrate temps with an infrared thermometer before starting — cold substrates pull heat out of the foam immediately 

• Never use open flames in the spray area 

Cold storage conditions don’t end with the drums. Your hose is the next critical point of failure. 

• Keep hose off snow, ice, and concrete — all three draw heat out faster than your machine can replace it 

• If your hose is more than two years old, inspect the insulation carefully for cracks or breaks 

• Address any insulation damage before the season gets cold — mid-job failures are expensive 

Mistake #1: Storing drums in an unheated trailer overnight
Cold nights can drop drum temps well below your target range. Always check temps before the first spray of the day. 

Mistake #2: Adjusting both heater sides when compensating for cold
For closed cell, only raise the resin side primary heater. Adjusting both sides throws off your ratio. 

Mistake #3: Laying hose on frozen ground Even short contact with ice or concrete pulls heat from the hose quickly. Get it off the ground and keep it elevated or coiled. 

Mistake #4: Skipping the visual check
Your foam will tell you when temps are off. Stringy, inconsistent, or poorly rising foam means something needs to be adjusted before you cover that substrate. 

Mistake #5: Using open flames to warm the area
Space heaters only. Open flames near spray foam materials are a serious safety hazard. 

Dialing in your cold storage conditions is one of the simplest ways to protect foam quality and avoid wasted material this winter. Whether you’re managing cold storage of closed-cell foam or cold storage of open-cell foam in barrels, the fundamentals are the same: know your target temperatures, monitor your drums and substrates consistently, and adjust your machine settings deliberately.

Start each cold-weather job by checking drum temperatures before you do anything else. Keep your hose off frozen surfaces, and if the foam doesn’t look right, stop and troubleshoot before covering the substrate.

Small habits can make a big difference when temperatures drop. Always follow your training and proper application procedures, and if you’re ever unsure about the right process or how to complete a job safely, our experienced Technical Service team is here to help.