HomeMy WebLinkAboutBLD2007-01435 ENG LTR 5-1-08.TIFMay 1, 2008
S. A. Brown Development Company
8304 Aeromarine Blvd
HARRISON
C O N S T R U C T I O N &
C O N S U L T I N G E N G I N E E R S
Catawba, NC 28609
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Re: 8304 Aeromarine Blvd ,00 `
Porch Framing Structural Evaluation — Revision to Original Design
HCEC- 0408073
Dear Scott,
Per your request, Harrison Consulting Engineers has completed an engineering evaluation of the
alternate approach to supporting the shed roof and cantilever deck above the garage at the above
referenced location. The alternate supporting arrangement was suggested in an attempt to
maintain symmetry of the deck and shed roof support system around the perimeter of the house.
The shed roof extends approximately eight (8') feet off the side of the house above the garage
and cantilevered deck. As the deck is cantilevered approximately four (4') feet beyond the main
support girder, there must be a means to support the load from the shed roof without impacting
the cantilevered deck. The new support arrangement consists of two (2) main support columns
which will bear directly on the cantilevered deck band. The columns will consist of PT 8x8
posts which will be notched and bolted to the deck band. The cantilever deck will be supported
down to the masonry columns below with PT 8x8 knee braces attached to the masonry columns
will ' /." steel brackets. The knee braces will be attached at the cantilevered deck band with
another '/" steel plate and through bolted.
The original roof system called for the roof support post to extend up directly above the knee
brace attachment points. The new symmetrical arrangement removes two support posts. The
analysis was then run on the shed roof band with the new spans and also on the cantilevered deck
band. The deck band was the critical case as that band must support the roof point loads as well
as the tributary design loading on the deck. Within the new arrangement, the left roof support
post (as seen facing the garage) will drop down and be supported close to mid -span between two
knee braces. The right roof support post will be very close to lining up with a knee brace on the
right side. Based on this arrangement and in consideration of the design loads, the new support
system is adequate and will provide the necessary support for the roof and the deck.
We appreciate the opportunity to provide you with this assessment. If you should have any
questions, please feel free to call at any time.
Sincerely,
2!91 A. Hardsoq P.E, G.C.
Harrison Construction and Consulting Engineers, P.A.
Harrison Construction and Consulting Engineers
Phone (704) 280 -1913 Fax (704) 375 -1867