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CASE STUDY
Repair of Original Construction Defects in a Single Family Residence

SYNOPSIS
We were requested to design and prepare construction documents for the repair of a single family residence.  The scope of damages included widespread cracking of interior drywall surfaces, sagging and deflection of various floor surfaces and misalignment of interior passage doors consistent with excessive settlement. Our investigation revealed a number of structural defects in the original construction of the building.

 

MAIN REPORT

Summary Of Damages
There is cracking of interior wall surfaces and general settlement of the structure due to inadequate support for the interior load-bearing girders in the crawl space.
 

Scope Of Repair
The enclosed Drawings and notes and this Plan of Repair indicate the work to be performed at the existing property noted above.

The purpose of this Work is to improve the support for the first floor framing.

This is to be accomplished by upgrading several wood girders and installing new foundation piers as shown.
 

General Notes
Temporary removal of electrical, mechanical and plumbing utilities may be necessary to carry out this work. The CONTRACTOR shall perform this work himself or hire a qualified subcontractor to perform this work.  The CONTRACTOR is responsible for the reinstallation and reactivation of any utilities affected by this work.

The CONTRACTOR is responsible for the replacement of any existing material(s), outside the scope of the Work, damaged during this project.  This will be at no cost to the OWNER.

All construction methods and materials not specified herein shall comply with the North Carolina State Building Code, Volume VII, Residential, 1997 Edition, hereafter identified as the "Code". 

As required under North Carolina General Statute, Section 87-1, any construction project costs $30,000.00 or more must be performed by a General Contractor licensed in North Carolina. If your bid exceeds this limit, you must submit proof of license for your bid to be considered.
 

Repair Specifications
Perform the following repair work in the order presented.

R1.   GENERAL

  • The CONTRACTOR shall protect areas of the house and landscaping beyond the immediate work area from damages which could possibly result from the Work.  Before beginning work, all underground utilities which may be affected by the work shall be located and flagged.  All excavation in the area of utilities shall be performed by hand.  The CONTRACTOR shall protect utilities at all times. 
  • The CONTRACTOR is responsible for field verification of all dimensions and for exercising due caution in shoring or otherwise supporting the building structure before beginning any work which involves removal of any of the existing foundation or framing structure.   The CONTRACTOR shall provide temporary shoring for the exterior deck, the exterior floor beams and joists, or any other portion of the structure whenever it is reasonably foreseeable that repair operations may affect the support for the structure.
  • All concrete shall be minimum 2500 psi concrete with an 4 to 5 inch slump.  Field prepared or bag mixes are acceptable provided they are mixed in a drum or pan prior to placing in the excavation.  Do not mix concrete in the footing excavations.
  • All work is to be performed in accordance with the specifications and plans referenced herein. Any deviations shall be reported to McClancy Engineering prior to commencing work.
  • Unless otherwise specified, all existing foundation elements may remain in place.
  • The CONTRACTOR is responsible for complying with all applicable state building codes and any state and local regulations.  The CONTRACTOR shall also obtain all permits and licenses required by the governing agencies.
  • The CONTRACTOR shall clean the site of all trash and debris, store all equipment and stack all lumber and materials at the completion of work each day.
  • All excavations shall be made to suitable firm, undisturbed soils.  Footing excavations shall be hand cleaned of all loose material. The CONTRACTOR shall notify the ENGINEER immediately if plastic clay soils, loose fill or other unsuitable soil condition is encountered.
  • All excavated materials shall be stored on site and protected from the weather.  After installation of the new piers and backfilling to original grade, any remaining soil shall be placed against the foundation, graded to assure positive drainage away from the house, and properly consolidated.
  • Repair and replacement of materials incidental to the Work which may be damaged shall be repaired at no cost to the OWNER.  The repairs shall be made using construction and materials equal to or greater than the original in quality and appearance. 

R2.   Excavate for the six new footings in the locations shown.  New footings shall be  located as shown.  Footings shall be a minimum of 8 inches deep and 24x24 inches square.  Below the stairs, locate the footings and piers below the point loads.

R3. After allowing as the concrete at least three days to set up, construct concrete block masonry units or install metal pipe columns sized to support the wood framing above.

R4.  Install blocking between adjacent joists below the wall between the living room and family room.  It may also be required below the wall between the kitchen and dining room. Blocking shall be 2x6 timber and shall be supported on minimum 2x2 ledger strips as shown on the drawings. Alternately, joist hangers may be used. Blocking shall be 16" on center, and double blocks shall be installed below all door jacks and columns.

R5.   Install companion joists below the load-bearing wall between the kitchen and dining room.  Increase existing support to (4) 2x10 or (5) 2x8 joists.

R6.   Install Simpson U26-2 and U210-3 metal beam hangers at the two locations shown.

R7.   Install double joists below the left-to-right walls at the hallway and stairs if the existing joists are not already doubled.

R8.   Upon completion of the repairs, all damages caused by the Work shall be restored to the condition existing before the Work began.  The jobsite shall be thoroughly cleaned of all construction materials and debris.  Backfill of the excavated areas shall be placed in loose lifts not to exceed 8" thick and shall be thoroughly tamped.

 

 

1051 Pemberton Hill Rd., Suite 102     Apex, NC 27502