Looking at putting a deck off the back of the house. Deck is going to be 16' x 18' (16' parallel with house). I thought of having (3) 4x4 post in the 16' direction and (3) posts in the 18' direction plus the ledger board. For my girders, I was going to sandwich a 4x4 post in between 2x10's. From the girders I was going to hang 2x8's. Will the post spacing be able to handle the load of the deck ( I saw 55 lbs per sq ft) was this in the ball park???? The framing mentioned above, is that overkill of on the right track??? Look forward to someone with more design experience giving some advise!!!!!! Thanks

I want to add an attached pergola to my concrete patio. Is the a way to attach the post to the concrete? I don't want to have to dig thru the concrete to set the post in a hole.