Foundation Plan

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Foundation Plan A FOUNDATION PLAN is a top view of the footings or foundation walls, showing their area and  their  location  by  distances  between  center lines  and  by  distances  from  reference  lines  or boundary   lines.   Actually,   it   is   a   horizontal section  view  cut  through  the  walls  of  the foundation  showing  beams,  girders,  piers  or columns,  and  openings,  along  with  dimensions and  internal  composition. The foundation plan is used primarily by the building crew who will construct the foundation of   the   proposed   structure.   In   most   SEABEE construction, foundations are built with concrete- masonry units and cast-in-place concrete. Figure 10-18 shows a plan view of a structure as it would look  if  projected  into  a  horizontal  plane  that passes  through  the  structure  slightly  below  the level of the top of the foundation wall. The plan shows  that  the  main  foundation  will  consist  of 12-in.   concrete-masonry   unit   (CMU)   walls measuring 28 ft lengthwise and 22 ft crosswise. In this plan, the CMU walls are identified by the standard  symbol  for  concrete  block.  Ideally,  a specific  note  should  be  added  to  call  out  the material. A  girder  running  through  the  center  of  the building  will  be  supported  at  the  ends  by  two 4-by 12-in. concrete pilasters that will butt against the  end  foundation  walls.  Intermediate  support for  the  girder  will  be  provided  by  two  12-by  12-in. concrete  piers,  each  supported  on  18-  by  18-in. spread  footings,  10  in.  deep.  The  dotted  lines around the foundation walls indicate that these walls  will  also  rest  on  spread  footings. You need relative information about the total concept of the structure before you can draw the foundation plan. You must make a careful study of the materials and construction methods used, observe the type of foundation used, and analyze the   relative   position   of   the   framing   and   the foundation wall or footing. You must also make reference  to  all  of  the  applicable  wall  sections  and typical  sill  details  found  in  your  texts  and reference  materials,  such  as  the  Architectural Graphics Standards before you start the founda- tion  plan. In  most  drafting  practices,  it  is  customary to  use  the  ground  floor  plan  to  develop  the Figure 10-18.-Example of a foundation plan. 10-21

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