Frame Door and Window Rough Openings

A. Finished-Project Specification

Scope: every door and window rough opening scheduled for the designated wall section, each framed with king studs, jack studs, a header, a sill where applicable, and cripple studs, and each verified against its scheduled rough-opening dimensions.

B. Required Documentation Schedule

Document	Source	Confirmation Required
Door and window schedule	Design professional / plan set	Current revision on site; each unit's rough-opening dimensions confirmed
Header reference / specification	Design professional / prescriptive table / manufacturer	Header size, ply count, and material confirmed for each opening
Wall fastening schedule	Design professional / plan set	Fastener type, size, and pattern confirmed for opening members
Manufacturer installation instructions	Door / window manufacturer	Confirmed for any unit-specific rough-opening clearance

C. Layout Materials and Consumables

• King and jack stud stock: size and grade specified by the wall schedule, quantity per the number of openings.
• Header stock: material, ply count, and dimensions specified by the header reference for each opening.
• Sill and cripple stock: size and grade matching the wall's common stud material.
• Fasteners: type, size, and pattern specified by the approved wall fastening schedule.
• Marking materials: chalk line and chalk, lumber crayon or pencil, sufficient for every scheduled opening.

D. Acceptance Standards

Check	Standard
Rough-opening width	Matches the scheduled dimension within the tolerance stated on the approved plan; if no project-specific tolerance is stated, obtain the applicable tolerance from the design professional
Rough-opening height	Matches the scheduled dimension within the approved tolerance, measured at both jambs
Jamb plumb	Each jack stud is plumb within the approved tolerance over its full height
Header and sill level	Header and sill are level within the approved tolerance across the full opening width
Opening square	Diagonal measurements of the opening differ by no more than the approved tolerance
Fastening	Every king stud, jack stud, header, sill, and cripple connection matches the approved wall fastening schedule

E. Schedule Review and Opening Layout (Steps 1–6)

1. Review the door and window schedule, rough-opening dimensions, sill heights, header references, bearing requirements, and manufacturer information. Record each opening's schedule data on the field copy before layout begins.
2. Confirm that opening dimensions are based on the selected unit and approved plan rather than nominal door or window size alone. Use the rough-opening dimension stated on the schedule, not a size inferred from the unit's marketed name.
3. Identify each opening by wall, type, size, and orientation. Label each opening on the field plan with its schedule designation before marking the plates.
4. Transfer opening centerlines and edge locations to the top and bottom plates. Measure from the established wall reference corner and mark both plates identically.
5. Mark king studs, jack or trimmer studs, header limits, sill members, and cripple-stud locations on the plates. Label each mark with its member designation as it is struck.
6. Verify that openings do not conflict with corners, intersections, hold-downs, utilities, or concentrated loads. Compare each marked opening against the corner and intersection locations established in Chapters 7 and 8 before cutting any member.

F. King Stud, Jack Stud, and Header Preparation (Steps 7–11)

1. Select and prepare king and jack studs to the approved lengths. Cut king studs to full wall height and jack studs to the height specified by the header elevation and rough sill height.
2. Assemble paired or built-up jamb members in the specified orientation. Fasten jack studs to the inside face of each king stud per the wall fastening schedule where the design calls for a fastened pair before installation.
3. Prepare the header only from the supplied header specification; do not select structural header size from guesswork. Confirm ply count, material, and dimensions against the header reference recorded in Section E before cutting.
4. Install spacers, insulation, plywood, or built-up header components only when specified. Use the exact spacer material and thickness stated in the header specification.
5. Assemble the wall opening flat when practical. Where the wall section allows flat assembly, lay out and connect king studs, jack studs, and header in position before standing the assembly.

G. Framing the Opening (Steps 12–18)

1. Install king studs and verify their plate layout. Fasten each king stud to the top and bottom plates at its marked location and confirm it matches the layout mark on both plates.
2. Install jack studs with full bearing under the header ends. Confirm the jack stud is seated fully on the bottom plate and plumb before fastening it to the king stud.
3. Set and fasten the header at the approved elevation. Measure the header's underside elevation from the bottom plate and confirm it matches the schedule before final fastening.
4. Install window sill members level and at the specified rough sill height. Measure the sill's top edge from the bottom plate and confirm it matches the scheduled rough sill height.
5. Install upper and lower cripple studs at the required spacing. Maintain the wall's common stud spacing through the cripple-stud layout above the header and below the sill.
6. Maintain required backing and sheathing-edge support. Confirm every sheathing panel edge at the opening will land on a king stud, jack stud, header, sill, or cripple stud.
7. Fasten all opening members according to the approved schedule. Complete every king-stud, jack-stud, header, sill, and cripple-stud connection per the wall fastening schedule.

H. Verification and Documentation (Steps 19–24)

1. Measure rough-opening width at top, middle, and bottom. Record each measurement and compare it with the scheduled rough-opening width.
2. Measure rough-opening height at both sides and center where required. Record each measurement and compare it with the scheduled rough-opening height.
3. Check jambs for plumb, sill and header for level, corners for square, and opening plane for twist. Use the level and diagonal measurements to confirm each condition against the approved tolerance.
4. Correct authorized dimensional or alignment errors before sheathing. Re-verify the opening after any correction is made.
5. Label each completed opening with its scheduled unit designation. Mark the label where it will remain visible until the unit is installed.
6. Record opening dimensions, header reference, fastening, and inspection results. Enter every measurement and confirmation on the framing-readiness record before proceeding to sheathing or Chapter 10 header work.