21 sq ft is not beyond R45. read the drawings carefully and don't forget to add in the 8 sq ft of windload inherent in the draswings. In other words, R45 is rated at 14+8 = 22 sq ft. in the last drawing I looked at. 73 bob de w9ge Bill Tippett wrote: >VE6WA wrote: > > > > >Total load: 20 to 21 SF > > > >