The location for this addition came with some interesting structural challenges. The patio concrete slab was of unknown thickness and reinforcing. Nobody was willing to do a stress test on it for obvious reasons of liability, but we did know that the flat roofed screen porch had seen many years of use with 4 foot snow drifts. In addition, the heavy masonry fireplace would add more load (although it was located over a masonry wall).

Our approach was to reduce the load on the south wall of the addition, so that we could add the load of the chimney. The roof is supported by a center ridge beam as well as a smaller beam at the roof inflection point on the south side (the top of the shed dormer).

The masonry fireplace and chimney rest on a thickened, heavily reinforced slab, which distributes the load to more area.

 

After

Before