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ROOF PITCH
The standard roof pitch for the Dobson is a 3/12 pitch.
DESIGN LOADS
The typical design load allows for:
12 pounds per square foot dead load
30 pounds per square foot live load
20 pounds per square foot wind load. (Equates to 100 MPH)
There are variables that affect the design sizes of the members,
specifically the columns and the beams, and those variables
generally include live load conditions which are usually location
specific. Building Codes usually dictate the applicable loads to be
applied in the member size designs.
PRESSURE PRESERVATIVE TREATMENT
As noted in the component list above, the wood columns are
fabricated with lumber pressure treated (prior to gluing) with
Penta-WR type “C”, at .6 pcf [6 tenths of a pound of preservative
per cubic foot of wood] retention for “ground contact”). For
applications where the treated member is not in ground contact, the
treatment retention is .3 pcf. The fascia boards are treated with
pentachlorophenol, and the .3 pcf retention is used. EnWood utilizes
the pentachlorophenol treatment because of its premier qualities and
the treatment does not discolor the wood and can be stained or
painted.
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