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INTRODUCTION
- This e-article is about designing a home foundation, specifically a foundation plan for slab-on-grade and t-wall placement
FOUNDATION PLAN
Comment: From this custom home designer's vantage, the two most technically difficult custom home plan designs are the Electrical & Lighting Plan and the Foundation Plan. Both require welters of dimensions and texted detail to adequately convey home designer and homeowner intentions and interests. If you don't go to uncommon lengths of preparation and authorship, you'll get what the other guy is used to building which, gaw-ron-teed, isn't what you'll get from respecting Before The Architect's workproduct.
Foundation Plan, Plan View, Scaled 
KEY: A = details of rebar connections at changes of footing and wall direction so as to affirm a right way to reinforce a concrete foundation structure and the wrong way which crumbles it (please see hereunder "House Concrete Projects, Reinforcement - Rebar Design Standards" at http://searchwarp.com/swa217266.htm) B = an alert to foundation contractors of a radon mitigation plan thereunder on another sheet (please see hereunder "Planning a Radon Mitigation System For a Custom Home – Radon Mitigation System Design and Construction" at http://searchwarp.com/swa297956.htm, which plan must be initially executed with the foundation plan, else the careful preparation of substrates below the slab on grade to let to exhaust down and out for condensate and up and out for vapor would be for naught
C = extensive design and construction notes - to extensive to fit within the habitable footprint - on wide-ranging subjects of foundation materials and methods, majorly including reinforced concrete slab-on-grade exterior deck at front of house and back of house; 10 linear inch reinforced concrete wall; reinforced concrete strip footing; monolithic, reinforced concrete interior slab-on-grade; perimeter footing drain (please see hereunder "Home Footing Drain, Slab Drain" at http://searchwarp.com/swa223787.htm, reinforced concrete steps at front of house and side of house; garage slab-on grade at L1; anchor bolts; etc.
D = notes on critical matters including siting of bond breaks and depth metrics for footings and perimeter foundation drainpipe
E = notes specific to this foundation plan including but not limited to: metrics of rebar cover; fill limits; floor truss support; guidance on thickening the reinforced slab-on-grade, sill plates; aggregate; subslab conduit; truss designers responsibility to alert for adjustments to identified foundation elements for previously unexpected critical load path descension, etc.
F = alert to contractors in regard to the respect of this plan that's expected, plus motive and method to amend it
G = the foundation plan layout for all elevations, dimensioned and annotated. Note well that exterior dimensions run exclusively from footing articulation at outside faces.
H = detail section in elevation of how concrete steps shall be founded, formed, and reinforced
I = key to about 55 abbreviations and acronyms used in the foundation plan, in order to diminish substantially the length of text particularly for oft-repeated words and phrases, e.g., RR for rebar and SOG for slab-on-grade, respectively
FOUNDATION PLAN, CLOSE-UP
Foundation Plan, Plan View, Partial  ABV=above; ABV=above; APX=approximately; BEL=below; BM=beam; CONT=continuous; CP=centerpoint; CVR=cover; DRS=doors; EL=elevation; FGL=finish grade level; GD=grade; GRG=garage; HOR=horizontal; INT=interior; JST=joist; JT=joint; LI=linear inch; NLT=not less than; OA=overall; OC=on center; PRM=perimeter; PSG=passage; RN=radon; RNF=reinforced; RR=rebar; SOG=slab-on-grade; SP=standpipe; T&B=top & bottom; TYP=typical; VEH=vehicle; VERT=vertical;X=excluding. Note well that annotations and dimensions at and in some part at margins have been deleted for clarity and concision of presentation.
Texted references to each of the 26 different markers follows –
A = Elevation at head of exterior deck slab-on-grade relative to L1 (main floor) floor level, set 6 linear inches below L0 floor level
B = L0 interior floor level slab-on-grade relative to L1 floor level
C = true masonry pilaster
D= pair of grade 50-#5 deformed rebar set across each foundation wall outside and reentrant, or inside, corner; exterior bars are epoxy-coated
E = reinforced, concrete, modified grade beam spread footing
F= reinforced, concrete, modified grade beam
G = control, or contraction, joint . . . note, please that with most applications of control, or contraction joints, they're centerlined on grade beams and modified grade beams for additional support. There are two exceptions: one, no additional support when the joints are very short – who needs it?; two off-centered where framing is planned to overrun a joint line along its axis. This latter exception bears further explanation.
This custom home designer guidelines leveling-off control joints with special sealers, in order to smooth the slab-on-grade floor plan and to mitigate against leaking of sub-slab gas or moisture as joints open. Indeed, the 2008 International Residential Code requires such sealing wherever radon mitigation is required by authorities having local jurisdiction. Further, this home designer prefers leveling-off with sealant at the last possible moment before framing, which would not be possible if framing covers the joint. It's essentially about sealing, which can neither be done nor monitored with joints below bottom plates. So, the joints get off-centered on grade beams and modified grade beams the alignment of which are on-center to load paths.
H = reinforced, concrete grade beam
I = text and section in plan view of a reinforced, concrete grade beam spread footing
J = text alert defining meaning and purpose of unusually formed, reinforced, concrete, modified grade beam spread footing (note that such foundation elements require a knowledge not only of L0 structure, but also L1 structure)
K = reinforced concrete thickened slab-on-grade below pool table . . . table has been sized to be playable in given space with certain-sized pool cues plus 1 linear foot extension at perimeters
L = expected orientation of L1 floor joists in this area, for which foundation as-drawn is intended to support
M = anchor bolts with 3x washers and hex nuts
N = L1 floor level elevation
O = radon riser pipe piercing the L1 garage slab-on-grade with indication of direction pipe will take to recess in nearest wall frame
P = L1 and L0 garage floor levels at their respective points, each relative to L1 floor level . . . note that in both L1 Garage and L0 Workshop, the slab-on-grade elevation indicators decrease from heads of each at 1/8 linear inch to 1 linear foot
Q = a passage, in which no anchor bolts shall be set
R = DWV stubs which are individually labeled and trailed within walls all the way to the attic . . . note the dimensional triangulation of each stub to reinforced concrete footing inflections
S = centerpoints of stainless steel pegs set in concrete, to counter shear force on the posts in which they will be embedded
T = centerpoint in the centerline of ultimately framed wall behind the bar sink
U = radon mitigation riser pipe stub to feed condensate and be fed sub-slab-on-grade gas . . . not that each such pipe shall be specifically labeled at each level in accord with code and a radon mitigation plan sheet and texted floor level sheets thereunder
V = typical, extensive note of materials and methods in regard to a foundation element, which note and its like are short enough to fit cleanly within foundation perimeters
W = reinforced concrete footing
X = reinforced concrete wall
Y = reinforced concrete wall interior sides of face dimensions to control, or contraction joints on-center lines
Z = reinforced concrete footing interior sides of face to intermediate element centerlines
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