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Window rough opening before installation checklist

A pre-installation window rough-opening checklist for product and method, opening size and shape, sill support and slope, framing and structural condition, rot and moisture, sheathing, drainage-plane access, interior and exterior clearances, safety glazing and egress implications, and documented repairs before the window is set.

6 items to check

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Window product, installation method, wall type, and opening match the approved scope

Critical item

Full-frame, fin, insert, masonry, buck, and other methods require different opening and drainage details.

Rough opening size, level, plumb, square, and plane are within product requirements

Critical item

The frame should fit with required clearances and shimming without distortion.

Header, sill, trimmers, cripple framing, and attachment substrate are sound

Critical item

Framing should provide approved load support and fastening without concealed decay or unapproved cuts.

Leak source, rot, mold, insect damage, and wet materials are resolved before closure

Critical item

New flashing should not conceal active damage or contaminated material.

Weather-resistive barrier, sheathing, sill, and head areas are accessible for proper flashing integration

Critical item

The opening should allow shingle-lapped or approved integration with the wall drainage plane.

Existing condition, repairs, dimensions, and approval are photographed before pan and window installation

The owner should retain proof of the concealed opening condition.

Use after the old window and trim are removed or the new opening is framed but before the replacement unit, sill pan, or flashing hides existing conditions. Do not use unsafe ladders, walk roofs, remove structural support, or disturb lead, asbestos, or mold-containing assemblies. Require qualified building-envelope, structural, roofing, window, door, and siding professionals where appropriate.

Reference standards

  • Approved wall, window, door, roof, deck, siding, drainage, and structural details; adopted state and local building and energy code; permit and inspection conditions; authority having jurisdiction requirements; signed scope; and exact flashing, membrane, sealant, fastener, cladding, window, door, and drainage manufacturer instructions
  • Exact window installation method and rough-opening requirements
  • Approved structural repair and opening details where framing is altered

    • Tools

  • Approved drawings, opening and product submittals, wall-section details, permit records, and authorized changes
  • Tape measure, level, flashlight, camera, and owner-safe ground-level observations
  • Dated pre-cover photographs and manufacturer-compatible material records showing drainage-plane continuity

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