When framing begins, they place a sill plate or some wood on top of the block and concrete to build the base for the walls and floors. The wood packages are shipped to the site and a the framing labor arrives and builds the wood part of the house to the specifications found in the plans. There are multiple grades of wood you can use which will affect the cost and the size of the wood will affect the cost as well. We used 2 x 6 boards in our walls instead of the normal 2 x 4 construction because we knew the tile roof and upstairs tile floor would make the house very heavy. Our framing went very quickly and day by day the house from our plans appeared right in front of us. They used Advantech wood which is like a water resistant plywood. Initially there are supports boards nailed into the floor and walls at various odd angles. These support the structure until all the sheets of wood are nailed to the walls. The Advantech wall boards made the structure much stronger and the supports were removed. A breathable waterproof wrap is applied to the outside of the wood structure. This keeps water from outside from making the wood wet. Even after the bricks are added there is still moisture behind the brick and the wrap continues to protect the wood. Normally houses can have a “stick built” roof where it is constructed in place or you can have trusses. For our heavy tile roof we needed the sturdy trusses that were built offsite then delivered onsite. They came with a plan and they were numbered so it was clear where each piece needed to go.