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BEFORE THE ARCHITECT – CUSTOM HOME DESIGNING BACKGROUND – HOUSE DESIGN ARTICLES

ALL ABOUT HOUSE FOUNDATION PROBLEMS and YOUR HOME DESIGN FOUNDATION PLAN FOR CONCRETE SLAB-ON-GROUND REINFORCED WITH REBAR

By Before The Architect  Copyright 2009

YOU MAY FREELY QUOTE THE AG WITH PROPER ATTRIBUTION

 

Take courageous, considered risks; do not take brave, foolish risks. You will be known for your successes and your failures.  Failing at courageous, considered risks is OK.  Failing at brave, foolish risks is not OK.    Before The Architect

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QUESTION: WHASSUP WITH HOUSE  FOUNDATION PROBLEMS?

ANSWER:  PRETTY NEAR NOTHING WITH A GOOD HOME FOUNDATION PLAN.

REBAR HOME FOUNDATION PLAN GUIDE

INTRODUCTION

bulletHome foundation contractors can be as obdurate as their medium when it comes to home concrete projects, including reinforced, rebar design.
bulletIf they’re engineers, too, this litany won’t surprise ‘em much at all.  But most aren’t engineers, too.
bulletThere’s good reason for every rebar design standards entry to follow and almost all self-explanatory; each entry is worth review with your home foundation contractor.  The intention herewith is that you’ll get better reinforced concrete home foundation and the home foundation contractor may learn a thing or two. 
bulletIf the home foundation contractor demurs or denigrates, then get another home foundation contractor
bulletNow, none of this is – ahem – cast in concrete.  Home project concrete, that is. 
bulletThere are conditional and situational latitudes and limits on any job anywhere. 
bulletAs an owner, go through the salient points and judge for yourself whether you’re going to work with the right contractor or not. 
bulletAs a home designer, adapt this guide to reinforced concrete as seen fit between you and your home foundation contractor to the overall design and specify, recognizing apparent conditions and situation. 
REBAR DESIGN STANDARDS

bulletRebar (a/k/a of one or another of two types of home reinforced foundation deformed bar, for its uneven surfaces of several distinctively different configurations that keep it from easily moving in placements; smooth bar, for its absence of deformations on its exterior surfaces, allowing its application latitude in home foundation element movements at right angles to its axis)
bulletShall be fresh and clean
bulletShall be detailed and accessorized in conformance with not less than Concrete Reinforcing Steel Institute (CRSI) “Manual of Standard Practice," latest edition
bulletShall always be set on chairs – like wire spiders or napkin caddies that keep rebar from touching the grade at a slab-on-grade bottom of face – (not dobies – little pads – or bricks, jobsite scraps, and the like) for applications on the horizontal
bullet Which chairs shall not be less than Concrete Reinforcing Steel Institute (CRSI), Class 2
bullet Which chairs shall be preferably CRSI Class 1
bullet Which chairs shall not be CRSI Class 3
bulletShall conform to not less than most recent ASTM A-615 M-04a (a/k/a American Society for Testing and Materials, “Standard Specification for Deformed and Plain Billet-Steel Bars for Concrete Reinforcement") Grade 40-#5 overall, unless otherwise noted
bulletShall not be in permanent contact with
bullet Earth (same for welded wire mesh) 
bullet Water (same for welded wire mesh) or
bullet Ambient air (same for welded wire mesh)
bulletShall be covered by not less than ¾ linear inch plus maximum aggregate size
bulletShall not be welded or otherwise heated without express permission from a structural engineer
Rebar Laps, Section in Plan View

 

Key:  CNR = corner; HOR = horizontal; ISC = intersection; NTS = not to scale; RR = rebar; VERT = vertical

bulletShall be lapped
bulletNot less than the greater of 25 linear inches or 40 bar diameters and
bullet Only to the outside, or exterior, runs, i.e., never lapped to interior runs, at the following sites - see the illustration herein under Rebar Laps, Section in Plan View
bulletAt corners and intersections
bullet Along wall lengths (i.e., at other than corners and intersections) and
bulletShall also be staggered at not less than 4 linear feet
bulletTo counteract shear (not tension) in concrete home foundation segment replacement
bulletAs dowels
bullet Shall be applied by a 3/4 linear inch bore not less than the greater of 9 linear inches or 80% of intersected wall width into existing home foundation and
bullet Shall protrude not less than the greater of 9 linear inches or 80% into new home foundation
bullet Shall be sealed to existing with appropriate Strong-Tie Adhesive or equivalent
bullet Shall be set on the horizontal
ü       Along the new home foundation centerline at not greater than the lesser of

ü       6 linear inches on center on the vertical overall or

ü       x rebar diameter or

ü       In 2 columns if wall width of either home foundation element is not less than 12 linear inches

bulletShall be set at 3 linear inches from wall top of face and footing bottom of face
bulletAs reinforced, transverse, deformed rebar
bulletShall be applied at contractor discretion
bulletMay be applied at point, or concentrated, loads
bulletShall be applied when footing depth is less than wall width, with engineering specification
bulletShall be applied when footing width is less than twice wall width, with engineering specification
bulletShall be applied when footing is not on-center to wall or other load, with engineering specification
bulletAs epoxy-coated rebar – smooth and deformed
bulletMay be applied at contractor’s discretion in which
bullet Bars and application shall conform with not less than
ü       ASTM A-775 M-00b (a/k/a American Society for Testing and Materials, “Standard Specification for Epoxy-Coated Reinforcing Steel Bars")

ü       ASTM A-934 M-00b (a/k/a American Society for Testing and Materials, “Standard Specification for Epoxy-Coated Prefabricated Steel Reinforcing Bars")

ü       ASTM A-884 M-01 (a/k/a American Society for Testing and Materials, “Standard Specification for Epoxy-coated Steel Wire and Welded Wire Fabric for Reinforcement")

ü       ASTM D-3963 M-01, (a/k/a American Society for Testing and Materials, “Standard Specification for Fabrication and Job-Site Handling of Epoxy-Coated Reinforcing Bars")

ü       AASHTO M284-97 (a/k/a American Association of State Highway and Transportation Officials, “Standard Specification for Epoxy-Coated Reinforcing Bars" and

ü       AASHTO M254-96 (a/k/a American Association of State Highway and Transportation Officials, “Standard Specification for Corrosion Resistant Coated Dowel Bars")

bulletShall be applied additionally at not less than 2-#5 Grade 50 deformed rebar on the horizontal centerline of a masonry ledge, at cover of ¾ linear inch plus maximum aggregate size
bulletShall be applied
bulletIn pairs
bulletNot less than 6 linear feet in length each, assuming fit of length with cover of ¾ linear inch plus aggregate size
bulletAt either termini
bullet Deformed #5 rebar-Grade 5
bullet Shall be set at mid-depth
bullet Shall be set equally into exterior corners at the perimeter, as an arrow’s shaft
bullet Shall be set equally across interior corners at the perimeter, as a see-saw
bullet Shall be set similarly at inside and outside corners interior to the perimeter where abutting slabs-on-grade vary significantly in elevation, as between habitable and garage
bullet Shall not to traverse a contraction joint at other than right angle
Pairs of #5 Deformed Rebar, Grade 50, at Both Crossing Evenly at Outside Wall Corner and Entering Evenly Into Interior, or Re-Entrant, Corner – Plan View

Key: AB=ANCHOR BOLT; ABS=ABSOLUTE (NOT NEGOTIABLE); BM=BEAM; BOT=BOTTOM; BW=BOTH WAYS; CONT=CONTINUOUS; D=DEPTH; EL=ELEVATION (RELATIVE TO L1 FLOOR LEVEL; FTG=FOOTING; GD=Grade; JT=JOINT; LI=LINEAR INCH; NLT=NOT LESS THAN; PNL=PANEL (I.E., FIXED DOOR SLAB); PRM=PERIMETER; PSG=PASSAGE; RR=REBAR; SOG=SLAB-ON-GRADE; SPD=Spread; TOF=TOP OF FACE; TYP=TYPICAL

bulletShall be set in pairs
bulletAt entry edge of vehicle garage door, crossing lengthwise
bulletAt each concrete stair tread, crossing lengthwise
bullet Along length of a concrete stair stringer

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