...SPRAY CAN FOAM WILL DEVELOP BIG HOLES IF NOT SHAKEN WELL ENOUGH OR IT IS TOO WARM...I KEEP IT AT 70 DEGREES IN A OLD REFER AND USE IT AS NEEDED...SPF WILL COME OUT OF THE GUN AT 135 DEGREES AND COOL OFF QUICKLY-HOLDING A SMALLER BUBBLE AND IT WILL FOAM UP ONLY SO MUCH...MUCH BETTER CONTROL THAN THE CAN STUFF....SPRAY CAN IS A CRACK FILLER AND SPF IS A INSULATOR & CAVITY FILLER....THE 2 ARE THE SAME CHEMICALLY BUT PACKAGING WILL CAUSE SOME INTERESTING ISSUES.....I GLUE IN THE BOARD FOAM WITH LIQUID NAIL AND LET DRY OVER NITE THEN SPRAY CAN IT TO SEAL THE EDGES...LET IT DRY OVER NITE AND TRIM OFF THE EXCESS.....ONLY DIFFERENCE IS THAT THE BOARD WILL ALLOW AIR TO MOVE AROUND AND THE SPF WON'T...WITH SPF THERE ISN'T AN ISSUE OF MOISTURE-WITH BOARD THEIR CAN BE A HUGE HEALTH ISSUE WITH MOLD MILDEW....1 INCH OF BOARD HERE IS ABOUT 60 CENTS AND SPF IS ABOUT $1.00 A BOARD FOOT...HEAT LOSS/CAIN IS ABOUT 40% MORE WITH BOARD AS OPPOSED TO SPF WHICH SEALS EVERYTHING TIGHT AND DRAFT PROOF....WHICH ALSO LESSENS THE ISSUE OF MOLD AND MILDEW....ALL IN ALL IF YOU ARE GOING TO KEEP THE UNITE FOR MORE THAN 3 YEARS AND HAVE ANY HEALTH PROBLEMS OR HAVE ANY ALLERGIES TO MOLD/MILDEW THEN THE ONLY WAY TO BUILD IS WITH SPF...OTHERWISE BOARD FOAM WILL DO....FIBERGLASS IS A PROBLEM WAITING FOR A PLACE TO HAPPEN...MOLD/MILDEW/AIR CONVECTION/DIRT TRAP/BACTERIA WILL GROW WITH ENOUGH MOISTURE....AND TO DRY IT OUT IS VERY EXPENSIVE....MAYBE AS MUCH AS 5 TIMES THE REPLACEMENT COST.........geofkaye and the Rivercity Girlz.....
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