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Exterior door sill pan before setting the door checklist

A pre-setting exterior-door sill-pan checklist for opening condition, support and level, pan slope and end dams, threshold bearing, drainage outlet, membrane continuity, jamb transitions, compatible sealants, fastener zones, accessibility and finish-height coordination, and documentation before the door frame conceals the sill.

6 items to check

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Opening, subfloor or slab, framing, and threshold support are sound and level as required

Critical item

The threshold should bear continuously or as designed without bridging rot, voids, or unapproved repairs.

Pan slopes and drains outward with end dams and back protection as required

Critical item

Water reaching the sill should be contained and discharged to the exterior drainage plane.

Corners, seams, patches, and jamb transitions are continuous and compatible

Critical item

The pan should not rely on an unverified bead of caulk at complex corners.

Threshold support and sealant plan preserve both bearing and drainage

Critical item

Sealant locations should follow the door instructions without blocking intended drainage or leaving unsupported gaps.

Interior floor, exterior landing, weather exposure, accessibility, and door clearance are coordinated

Critical item

Finished elevations should support intended use and weather resistance.

Pan, opening repair, sealant plan, and photos are approved before frame installation

Evidence should remain available after the threshold is concealed.

Use after the exterior-door opening is prepared but before the frame and threshold are installed. Doors receive foot traffic and concentrated water exposure, so sill support and drainage must be coordinated together. 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 door, threshold, sill-pan, membrane, sealant, fastener, floor, and wall-system instructions

    • 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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