Originally Posted By: mpatton
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I inspected a home built in the 40’s that has had major renovations done in the past 10 years. I understood many of the issues/remodels but had a concern when I saw the “new” roof from within the attic. When I viewed the roof from with in the attic (hip roof) I discovered that the original roof had been a flat roof with rubber membrane. The rafters were stick built spanning approximately 28’ from front to back of the house on a pitch of approximately 4/12.
The wall structure of the home is block with stucco finish and the perimeter walls are approximately 12" above the membrane roof.
What concerned me was that the rafters do not have any collar ties and that the rafters sit on the top plate with a birds mouth notched in them. The top plate appears to be secured to the top of the walls. Also space approximately every 10' or so is a vertical support with a short piece of lumber under them resting on the original roof as a support.
My concern is the lack of collars and in a heavy snow for example that the rafters pushing downward would also push the walls outward causing failure of the block wall/roof.
[ Image: http://www.nachi.org/bbsystem/usrimages/more/100_8708.JPG ]
Needles to say I did not go into great depths in the report, I differed this one to a structural engineer/contractor.
Any input would d be appreciated, I am looking to understand if this is a concern or if I am being overly cautions.