I always like to see people get a blower door test done as the first step before starting any projects, that way you find the weak spots and can start your projects well informed.
It took me years of working on houses to learn this, but when using caned expanding foam, the application gun is well worth the money, the foam costs more and the gun can cost $50 or so, but if you are going to be doing alot of projects where you need to do air sealing then it is well worth it, the control you get makes it worth it alone.
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