Underfloor Inspection Checklist

Use the Underfloor Inspection Checklist to verify compliance with the 2018 International Residential Code, ensuring all elements meet required standards.

Underfloor Inspection Checklist



Permits And Plans

1. Is the job address posted in a visible location ?


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2. Are permits and approved plans on-site and accessible to the inspector?


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3. Have corrections been noted and are they addressed at this time?


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4. If the foundation was inspected by a special inspector, are the reports approved and with the permit ?


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5. Have the approved plans been checked for identification of flood hazard areas and associated requirements for construction?


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6. Have the approved plans been checked for building height restrictions per the local jurisdiction?


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Grade

1. Is the grade under girders or beams a minimum of 12 inches ?


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2. Is the grade under joisting a minimum of 18 inches ?


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3. If it's less than 12 inches and 18 inches, respectively, are beams, girders, and joists pressure-treated ?


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4. Have the lowest floor elevations for any construction identified as being in flood hazard areas been verified (R322)?


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Foundation

1. Is the foundation clear of damage by backfill?


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Hardware

1. Is anchor bolting installed per the shear wall schedule when specified?


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2. Are anchor bolts installed at a minimum of 2 per plate, spaced a maximum of 6 feet on center, located in the middle third of the plate width, and a maximum of 12 inches from plate ends?


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3. Are square hot-dipped galvanized plate washers (minimum 3 inches by 3 inches by 1/4 inch) installed at pressure-treated plates within the width of the plate at anchor bolts ?


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4. Are there any strapping at drag struts, hold downs, top flange hangers, specified hardware, etc. occurring in underfloor areas?


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5. Are there missing or damaged hold-downs and anchor bolts within the sill plate, proper anchor bolt placement where sill plates have been cut, and/or foundation vents provided ?


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6. Are fasteners for preservative-treated wood of hot-dipped zinc-coated galvanized steel, stainless steel, silicon bronze, or copper? Are staples of stainless steel? Are coating types and weights for connectors in contact with preservative-treated wood in accordance withthe connector manufacturer's recommendations? In the absence of manufacturer's recommendations, is a minimum of ASTM A 653 type G185 zinc-coated galvanized steel, or equivalent, used? Exceptions: • One-half-inch diameter or greater steel bolts • Fasteners other than nails, staples, and timber rivets shall be permitted to be of mechanically deposited zinc-coated steel with coating weights in accordance with ASTM B 695, Class 55 minimum • Plain carbon steel fasteners in SBX/DOT and Zinc Borate preservative-treated wood in an interior, dry environment shall be permitted


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Framing

1. Has the floor plan for joists, beams, and posting been reviewed?


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2. Has the size, type, spacing, grade, etc. been noted?


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3. Is the dimensional joist bearing a minimum of 3 inches on concrete or masonry and 1-1/2 inches on wood or metal ?


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4. Have hangers been installed at head-outs, cantilevers, etc.?


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5. Are joists bearing and beams supported laterally at ends and at bearing points by solid blocking ?


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6. Is nailing of joisting, double joists, rims, etc. per plan and code?


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7. If wood I-joists are being used, has the layout been verified, and are installation guides onsite, with blocking detail, bearing requirements, etc., per the manufacturer’s specifications?


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8. For load-bearing cripple walls with studs less than 14 inches, are they fully blocked and sheeted on one side minimum with plywood and nailed per the shear schedule ?


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9. If cripple wall studs exceed 48 inches, are they the size required for an additional story?


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10. Are load-bearing cripple walls braced per code, minimum ?


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11. Have point loads requiring blocking, posting, and joisting additions been identified?


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12. Have shear walls been identified and have joisting and/or hardware details been noted?


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13. Are positive connections at the post to pads, post to beams, etc., in place ?


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14. Are areas where the shear wall and floor diaphragm nailing and/or blocking may occur (typically blocking perpendicular to jostling or specified hardware are connections) checked?


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15. Are crawl space venting requirements (1 square foot for every 300 feet of under-floor space) noted and verified?


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16. Are areas where plumbing may cause problems, such as toilet flanges centered on joists, plumbing walls, etc., checked?


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Framing And Concrete

1. Are girder end joints occurring over supports ?


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2. Are foundation plates, sills, and sleepers on concrete in direct contact with the earth-treated wood or wood of natural resistance to decay?


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3. Are areas where exceptional conditions may occur, such as patios, slabs, and steep areas, checked, with treated plywood and flashing or moisture barrier installed where necessary, and plywood sheeting required to be pressure-treated?


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Checklist by GoAudits.com – Please note that this checklist is intended as an example. We do not guarantee compliance with the laws applicable to your territory or industry. You should seek professional advice to determine how this checklist should be adapted to your workplace or jurisdiction.

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