Install Floor Joists and Rim Joists

A. Finished-Project Specification

Scope: one completed floor-joist system covering the full floor area supported by the beams and sill plates installed in Project 02, including all rim joists, doubled members, framed openings, hangers, and connectors specified by the approved floor-framing plan and joist schedule.

B. Required Documentation Schedule

Document	Source	Confirmation Required
Floor-framing plan	Design professional / plan set	Current revision on site
Joist schedule	Design professional / plan set	Species, grade, depth, and spacing confirmed for each span
Rim-board and hanger schedule	Design professional / manufacturer	Matches specified rim material and connector fasteners
Engineered-joist manufacturer instructions	Manufacturer	Field-cut, hole, notch, and bearing restrictions confirmed before layout
Project 02 beam and sill inspection record	Prior project record	Confirmed complete and stable before joist layout begins
Change documentation	Design professional / general contractor	All approved field changes incorporated

C. Layout Materials and Consumables

• Framing material: floor joists, rim joists or rim board, doubled-joist stock, and header/trimmer stock as specified by the joist schedule and opening framing details.
• Connectors and fasteners: joist hangers, hanger nails, toe fasteners, clips, straps, and blocking specified by the approved connector schedule; no substitution of generic fasteners for listed connector fasteners.
• Marking materials: chalk line and chalk, marking crayon or lumber pencil, sufficient for the common layout reference and every joist center, doubled member, and opening.
• Documentation: one floor-framing inspection record per floor or level.

D. Acceptance Standards

Check	Standard
Joist spacing	Matches the spacing stated on the approved joist schedule at every joist center, measured from the common layout reference
Bearing	Each joist is fully seated on its beam, sill plate, hanger, or ledger with no reduction of the minimum bearing length specified by the plan or manufacturer
Crown orientation	Every solid-sawn joist is installed with a consistent, marked crown orientation as specified in this project's Field Fundamentals
End alignment and rim connection	Rim joists are straight, plumb, and fastened to every joist end according to the approved schedule
Opening geometry	Framed openings match the approved dimensions with doubled trimmers, headers, and hangers installed as specified
Documentation completeness	Joist layout, field adjustments, connector installation, and inspection results are recorded on the floor-framing inspection record

E. Document Review and Material Staging (Steps 1–5)

1. Review the floor-framing plan, joist schedule, span direction, spacing, openings, bearing, rim-board, hanger, and fastening details. Confirm the revision date of each document against the project's document-control log before using it.
2. Confirm that beams, sill plates, bearing lines, and framing references are complete and stable. Verify the Project 02 inspection record shows the required approval before proceeding.
3. Inspect joists and rim material for correct type, grade, length, depth, treatment, damage, and manufacturer identification. Reject or quarantine material that does not match the joist schedule.
4. Identify engineered joists and confirm all field-cut, hole, notch, and reinforcement restrictions. Record the manufacturer instruction reference used for each engineered-joist location.
5. Stack and stage joists in installation order with adequate support and weather protection. Support stacked material level and clear of standing water or direct ground contact.

F. Layout and Special Framing (Steps 6–9)

1. Mark a common joist-layout reference on opposing sill plates, beams, or rim members. Strike the reference line from the reference corner established in Project 01 and label the reference end used.
2. Lay out joist centers using the approved spacing and maintain the specified orientation at ends and openings. Transfer every joist center square from the common layout reference on both opposing supports.
3. Mark doubled members, trimmers, headers, cantilevers, stair openings, plumbing zones, and other special framing. Label each special-framing location with its plan designation as it is marked.
4. Measure each joist location before cutting where field conditions vary. Compare the field-measured bearing-to-bearing dimension against the plan dimension before cutting joists for that location.

G. Crowning and Cutting (Steps 10–12)

1. Crown solid-sawn joists and mark a consistent crown direction. Sight or string each joist's narrow edge and mark the crown-up direction on the joist before cutting.
2. Cut solid-sawn joists square to the approved length without reducing required bearing. Cut from the reference end identified in Step 6 and verify the cut is square before installing the joist.
3. Do not cut engineered joists except as explicitly permitted by their manufacturer. Use only the field-cut, hole, and notch allowances confirmed in Step 4.

H. Setting, Fastening, and Openings (Steps 13–19)

1. Install rim joists, rim board, or end blocking in the approved sequence. Confirm the rim is straight and plumb before fastening the first joist to it.
2. Set the first and last joists and temporarily brace them plumb and in line. Verify each is on its marked layout center before fastening.
3. Install intermediate joists at the marked layout locations. Maintain the common layout reference at every intermediate location; do not measure from the previously installed joist.
4. Seat joists fully on beams, sill plates, hangers, or ledgers. Confirm full bearing contact at both ends before fastening.
5. Install joist hangers, toe fasteners, bearing restraints, clips, straps, or blocking required at supports. Use only the fasteners specified for each listed connector.
6. Frame approved floor openings with headers, trimmers, hangers, and doubled members according to the plans. Install doubled trimmers before cutting or hanging any interrupted joist at the opening.
7. Maintain required clearance from chimneys, vents, mechanical systems, and other heat or service components. Confirm the clearance dimension against the approved plan or applicable code table at each affected location.

I. Verification and Documentation (Steps 20–24)

1. Verify joist spacing, bearing, crown orientation, end alignment, rim connection, and opening geometry. Check each item against the Acceptance Standards table before continuing.
2. Sight the floor framing for high, low, twisted, bowed, or displaced members. Sight along the top edge of the joists from one rim to the other and mark any deviation for correction.
3. Correct authorized defects using the approved method; do not plane, notch, or sister structural members without permission. Obtain direction from the design professional for any deviation not covered by an approved detail.
4. Install temporary walking surfaces only where approved and supported. Confirm any temporary decking is fully supported on framing before use.
5. Record joist layout, field adjustments, connector installation, and inspection results. Complete every entry on the floor-framing inspection record before staging blocking material for Project 04.