I am building a playhouse with swingset attaching to it. One side of the swingset beam (4x8x12) will be A-frame. The other side is attaching to the playhouse. I have a question about attaching to the playhouse though. Is it OK to put 4x8 beam directly on top of 4x4? I am planning to have the swingset to be 7.5 feet high max. So if I get 4x4x10, can I bury 2.5 feet of the 4x4 post into concrete?
I want to do something similar to this http://myoutdoorplans.com/playhouse/outdoor-playset-plans/ but their example is using 4x4 beam and the 4x4 footing does not have concrete footing.
I imagine 4x8 beam would need to have 4x4 footing into concrete. Or is it not necessary?