Originally Posted By: mo
Do the sips have 2x dimensional lumber inside of them on a set center to give them there structural rating?


No

Quote:
If they do, could you not attach the ledger directly to them?


You'll have to check with your local sips supplier. But most don't have anything other than osb foam osb. My supplier will put pieces inside the sip for things like cabinet nailers, baseboard heater attaching, and for special jobs like ledger nailers for porch rafters. All of these are horizontal nothing on an angle...
They can put in vertical stuff if you need it...

Jim Rogers


Whatever you do, have fun doing it!