Can’t Blow Insulation at 45 degrees F!

We were right on schedule with our build…then a cold snap. We’re now delayed by a week due to this cold. Yes, it’s cold here in Florida…record cold tonight predicted to be below 30 degrees. Daytime temperatures aren’t much better…highs only in the 50’s.

Now the electrical system is complete and working, Charlie planned to spray polyurethane foam insulation this week but temperatures have to be above 75 degrees to spray Froth-Pak 620 Sealant. To make matters worse, this product is a combination of 2 chemicals that must be stored at 45 degrees F or higher in order to work properly.

So today Charlie had to load up all six 50-lb. cartons of chemicals, put them in the pickup, and bring them home. He unloaded them, put them in our garage, and turned on an electric space heater to keep the temperature above 45 degrees. Looks like he’ll be keeping them there for a few days.

Charlie can start spraying the insulation once the temperature climbs above 75 degrees – sometime next week. He’s never blown insulation before which is why he’s done extensive research on the product, including watching several videos of people applying it.

Installation and Specs

From the documentation, Froth-Pak 620 appears to be fairly easy to use. It comes in a 2-carton kit which includes all nozzles and hoses.

You attach a hose to each carton then run them into a nozzle. The nozzle has a mixer in it which mixes the chemicals as you spray them. The only downside is, if you stop for longer than 30 seconds, you need to change nozzles, as the chemical mixture solidifies quickly.

Froth-Pak 620 Sealant gives an R rating of 5.5 per inch which should be sufficient for our tiny house RV (THRV). Once you’re done spraying, you need to leave the house for 24 hours to allow the insulation to outgas. It might be longer for me since I’m allergic to polyurethane.

Yield is 200 sq. ft. with a thickness of 1 inch. We want 2 inches so Charlie figures 3 kits will be enough, allowing for the numerous 2×4’s and 2×6’s that won’t be sprayed.

Charlie bought another mask with a P100 particulate filter as the one he’d initially bought had only a P95 filter. He already had coveralls, eye protection and gloves.

Charlie’s all set to go but the weather just isn’t cooperating. That doesn’t stop Charlie, though. If he can’t continue building, he simply orders more parts for the THRV! More about those parts in upcoming posts.

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