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Building Development Division

When Are Special Inspections Applicable

The Special Inspections Program requirements, outlined in the Prince William County Special Inspections Manual (SIM), shall apply to the following structures and/or structural elements, submitted in the Statement of Special Inspections by the appropriate Registered Design Professional of Record (RDPR), or specified in BDD Policy 1.18 for minor critical projects, and/or, when so required by the Building Official:

  • All high-rise buildings, as defined by the most current County-adopted IBC
  • Construction requiring installation of deep foundations, helical pile foundations (helical piers), vertical masonry foundation elements (foundation piers)
  • All pre-stressed concrete elements of buildings and structures, regardless of their size
  • All precast concrete structural members and tilt-up concrete panels
  • All structural steel framed buildings which include any of the following:
    • Field welded, bolted rigid or semi-rigid connections for the purpose of stability or resistance to lateral loads
    • Bolted or welded stability bracing
    • Bolted connections that require a minimum pretension to be achieved
    • Clear spans of over 50 feet
    • Structural steel trusses or joists other than those of SJI specification
    • Plate girders of any span
    • Space frames with clear spans of more than 35 feet
    • Cable supported structures
    • Open-web steel-joists and joist-girders (including those manufactured to SJI specifications)
    • Steel floor and roof decks
    • Field-welded shear studs
  • Cold formed light gage steel primary structural members, e.g. in roof trusses and walls, temporary and permanent bracing details for roof trusses spanning 60 feet or greater.
  • All masonry designed in accordance with ACI 530 /ASCE 5 and ACI 530.1 / ASCE 6 that is used as a structural member and fire rated assembly; (e.g. all load bearing masonry, non-load bearing vertical shaft enclosures, other non-load bearing grouted walls etc.) – See exceptions in IBC
  • Elevators, Dumbwaiters, and Conveyor Equipment (Not Special Inspections items. Require mechanical third party inspections.)
  • Excavations that require structural support (refer to Chapter 10 - sheeting and shoring, for design and document submission requirements)
  • All retaining wall systems with unbalanced fill height:
    • Greater than eight feet
    • Between four and eight feet, with surcharge either from an adjacent structure or from a slope steeper than 3H:1V
  • Wood Construction (e.g. fabrication of high-load diaphragm, metal-plate connected wood trusses spanning 60 feet and greater, etc.)
  • Exterior Insulation and Finish System (EIFS) including water-resistive barrier coating – See exceptions in Chapter 22
  • Sprayed Fire Resistant Material
  • Mastic and Intumescent Fire-resistant Coatings
  • Smoke Control Systems
  • Special Cases - when determined by the Building Official