I want to put 1 1/2" rigid insulation on the exterior walls of a new home I will be building soon to help with the thermal transfer. I have used it before but have always put the rigid over the sheathing then strapping over the rigid. I would like to eliminate the strapping and put the rigid on the studs then the aspenite over the rigid. I would screw the aspenite to the studs but am concerned that the walls might loose some ridigity and strength. I am using vinyl siding so my other option is to use a longer siding nail and put the rigid over the aspenite. Any thoughts or concerns with this would be helpful.