subject: The Advantages of Self Build Homes [print this page] Once that's done then it's time to set the top floor walls in place, brace them off and get ready to stack the roof trusses. Now if you have never walked on top plate on a two story home to set roof trusses in place, then you will be well served if you take an afternoon off to rig up some temporary scaffolding. Then it's just a matter of nailing the trusses in place, sheeting the roof, and your frame is done.