......THE ISSUE IS STRENGTH/LONGEVITY OF THE COMBINATION OF MATERIALS:....FRP AGES AND WITH AGE COMES ROT FROM WATER VAPOR AND LEAKAGE...STEEL TUBING WITH AN ALUMINUM SKIN -SEPERATED FROM THE STEEL FRAME, WITH AN INSULATOR OF SOME SORT,-INSULATED WITH SPRAY FOAM ISOCYNATE-INTERIOR WALL COVERED WITH A 3/8" PLYWOOD SKIN-COATED WITH A MOISTURE/OFF GASING RESISTANT COATING/SEALING MATERIAL SUCH AS KILZ ON BOTH SIDES AND FASTENED PROPERLY WILL, IN THE LONG RUN, LAST THE LONGEST AND WILL HAVE THE LEAST ISSUES WITH MOLD/MILDEW/MOISTURE/INFILTRATION OF AIR/AND INFILTRATION OF WATER VAPOR/FIRE RESISTANCE/LEAK RESISTANCE......THAT IS THE BEST COMBO THAT THE MARKET WILL PRODUCE USING STANDARD MATERIALS....THERE ARE A FEW NEWER METHODS OF CONSTRUCTION BUT THE BOTTOM LINE IS COST EFFECTIVENESS OVER LIFE SPAN......geofkaye and the rest of the fools that work 7 day weeks in Cincinnati Ohio
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