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Safety Cue
Task-specific safety guidance for ordinary work hazards.
Project 09
Flash and Weatherproof an Exterior Door
Integrate the installed Project 08 prehung exterior door with the water-resistive barrier (WRB), sill pan, jamb flashing, head flashing, threshold seal, interior air seal, and exterior trim backing, without blocking the door's designed drainage paths.
Field Cue System
These cues appear at the point of work. They identify safety, code, manufacturer, and measurement issues before they become rework, disputes, or concealed defects.
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Critical Safety Cue
Serious injury or major structural consequence is possible.
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Field Safety Cue
Practical work-area safety: footing, debris, access, and exposure.
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Code Alert
Local requirements vary. Verify permit, inspection, and jurisdictional rules.
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Manufacturer Cue
Follow product-specific instructions for flashing, sealant, and foam.
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Measurement Cue
Clearance, dimension, tolerance, and reference-point guidance.
Job Overview
This project qualifies you to complete the concealed water-control and air-seal assembly around the prehung exterior door set and function-tested in Project 08. The finished work product is a flashed, drained, air-sealed, and operational exterior-door installation, together with photographs and records of every concealed detail, ready to receive the rainscreen furring, siding, and trim covered in later projects in this book.
You will review the controlling instructions, confirm the door remains plumb, square, and operational, protect the sill-pan drainage path, install jamb flashing tied into the sill pan, install head flashing and integrate the WRB head flap over it, seal only the designated frame, threshold, and trim joints, install approved exterior trim backing, air-seal the interior perimeter gap without disturbing operation, inspect every layer, and photograph the completed assembly before it is concealed by rainscreen and siding.
This project follows directly from Project 08, which set and function-tested the prehung door, and it precedes Project 10, which installs the rainscreen furring and drainage mat over the completed WRB. A door that is flashed but not correctly drained, or sealed in a location that blocks the sill pan or threshold weeps, becomes a concealed defect that the Project 19 full exterior water-control inspection must trace back to this project.
Skills You Will Demonstrate
- BE-049 — Flash door jambs from bottom to top with the required overlap onto the sill-pan upturns without bridging gaps or displacing the frame.
- BE-050 — Install rigid or flexible head flashing with the required end dams, projection, and extension beyond the jambs, integrated with the WRB head flap.
- BE-051 — Seal designated frame-to-pan, threshold-to-floor, and threshold-end joints with compatible sealant while keeping the sill-pan outlet and threshold weeps open.
- BE-052 — Integrate the WRB with the jamb and head flashing in correct shingle-lap order and patch any exposed sheathing or discontinuity.
- BE-053 — Install approved exterior trim backing or furring support without interrupting drainage, and air-seal the interior frame-to-rough-opening gap using the approved backer rod, sealant, or low-expansion foam.
- BE-054 — Inspect the completed door water-control assembly, correct failed conditions, and document the concealed detail with photographs and records.
Where This Skill Fits
Project 07 built the drained sill pan, and Project 08 set and function-tested the door in that opening. This project completes the water-control loop by tying jamb and head flashing into that sill pan and into the surrounding WRB, so that water striking the door assembly from any direction is shed outward and downward without reaching the rough opening or the interior. The interior air seal completed here also controls air leakage at the frame perimeter, which is separate from — and must not interfere with — the exterior drainage path.
The shingle-lap discipline used here (sill pan, then jambs, then head, then WRB head flap) is the same drainage logic used at every window and penetration flashing detail in this book, including Project 4 through 6 for windows and Project 16 for wall penetrations.
Scope and Intended Use
This project covers:
- rechecking door plumb, square, reveal, latch, threshold bearing, and operation before concealing fasteners or shims
- confirming the sill-pan drainage path remains open before covering it
- installing jamb flashing from bottom to top with the required overlap onto the sill-pan upturns
- installing head flashing with the required end dams and projection, integrated with the WRB head flap
- sealing only the designated frame-to-pan, threshold-to-floor, and threshold-end joints
- installing approved exterior trim backing without interrupting drainage
- air-sealing the interior frame-to-rough-opening gap with backer rod, sealant, or low-expansion foam
- inspecting, correcting, and documenting the completed concealed door-flashing assembly
This project does not authorize the learner to:
- seal, tape, or otherwise block the sill-pan outlet, threshold weeps, or any other designed drainage or ventilation opening
- substitute sealant, tape, or foam for a missing or incorrectly lapped flashing layer
- proceed with jamb or head flashing before the door has passed the Project 08 operation and alignment checks
- install rainscreen furring, siding, or exterior trim over this assembly before it has passed inspection and been photographed
Any condition that shows a reverse lap, blocked drainage, incompatible sealant, bowed jamb, or failed adhesion must be corrected before concealment. Stop work and obtain qualified review for any structural or door-operation issue outside this project's authorized scope.
Reference Conventions
Establish these references before any flashing, sealing, or air-sealing work begins, and do not change them once the assembly has been inspected and documented.
| Term | Definition |
|---|---|
| Frame flange or flashing flange | The door-frame surface or attached flange that receives jamb and head flashing layers |
| End dam | A raised or formed component at the end of the head flashing that directs water inward away from the jamb rather than off the end |
| Sill-pan upturn | The vertical leg of the Project 07 sill pan that extends up each jamb and receives the jamb flashing overlap |
| WRB head flap | The section of water-resistive barrier above the opening that is temporarily secured during Project 02 and integrated over the head flashing in this project |
| Designated joint | A joint identified by the sealant schedule as requiring sealant; all other joints, laps, and drainage openings remain unsealed unless the schedule states otherwise |
| Interior air-seal gap | The perimeter gap between the door frame and the rough opening, sealed from the interior with backer rod, sealant, or low-expansion foam |
Door Flashing Reference Record
Before beginning any flashing or sealing work, record the controlling instructions and reference data directly on the door-flashing inspection record:
Door location/ID: ______ Flashing product and lot: ______ Head-flashing component: ______ Sealant product and lot: ______
Date started: ____________ Installer name: ____________
Prerequisites
- Prehung exterior door set, shimmed, fastened, and function-tested under Project 08, with fastener seating, shim support, reveal, and threshold bearing accepted
- Sill pan from Project 07 passed inspection, clean, undamaged, and open to drain
- Door, WRB, flashing, head-flashing, threshold-sealant, and trim-system instructions available on site
- A door-flashing inspection record available for field entries
- A means to contact the responsible design professional or general contractor for discrepancies outside this project's authorized corrections
Common Field Fundamentals
Every concealed water-control assembly in this book — window flashing in Projects 4 through 6, door flashing in this project, and wall-penetration flashing in Project 16 — follows the same shingle-lap order: the lowest layer is installed first and every layer above overlaps the layer below, so water always sheds onto a layer that is already prepared to receive it. Learning that order at the door reinforces the same discipline used at every other opening and penetration in this book.
Jamb flashingBottom-to-top layers tied into the sill-pan upturns
Head flashingEnd dams and projection integrated beneath the WRB head flap
Designated sealantFrame-to-pan and threshold joints sealed; drainage left open
Interior air sealPerimeter gap sealed without disturbing exterior drainage
Keeping Drainage Separate From Air Sealing
The exterior flashing and drainage path and the interior air-seal gap serve two different functions and must never be merged. The sill-pan outlet and threshold weeps drain bulk water and must remain open at all times. The interior air-seal gap controls air leakage and is completed only from the interior, after the exterior flashing has passed inspection. Do not use interior foam or sealant as a substitute for a missing or incomplete exterior flashing layer, and do not seal the exterior drainage outlet to reduce air leakage.
BE-049 – BE-054
Flashing / Sealing / Air-Sealing Qualification
Exterior Door Flashing and Weatherproofing Assembly
A. Finished-Project Specification
Scope: one completed concealed water-control and air-seal assembly at one Project 08 prehung exterior door, including jamb flashing, head flashing, WRB head-flap integration, designated sealant joints, exterior trim backing, and interior air sealing.
B. Required Documentation Schedule
| Document | Source | Confirmation Required |
|---|---|---|
| Door manufacturer instructions | Door manufacturer | Frame-flashing sequence and prohibited sealant locations confirmed |
| WRB and flashing manufacturer instructions | Product manufacturer | Tape width, primer requirement, and lap dimensions confirmed |
| Head-flashing detail | Design professional / manufacturer | End-dam type, projection, and extension confirmed |
| Sealant schedule | Design professional / project specification | Designated joints and prohibited locations confirmed |
| Trim-system instructions | Design professional / manufacturer | Trim-backing method and rainscreen interface confirmed |
| Project 08 door acceptance record | Prior project record | Confirmed passed before flashing begins |
C. Preparation Materials and Consumables
- Flashing materials: approved jamb and head flashing tape or membrane, compatible primer, and a rigid or flexible head-flashing component matching the approved detail.
- Sealant materials: compatible sealant matching the sealant schedule, limited to designated joints only.
- Air-seal materials: backer rod sized to the interior perimeter gap, and low-expansion window-and-door foam or approved sealant for interior air sealing.
- Trim-backing materials: approved furring, blocking, or mounting support matching the rainscreen and cladding system.
- Documentation: one door-flashing inspection record per opening.
D. Acceptance Standards
| Check | Standard |
|---|---|
| Door condition before concealment | Plumb, square, correct reveal, functioning latch, and threshold bearing confirmed |
| Jamb flashing | Bottom-to-top order, full contact, required overlap onto sill-pan upturns, no wrinkles or fishmouths |
| Head flashing | Required end dams, projection, and extension beyond jambs, integrated beneath the WRB head flap |
| Sealant joints | Sealant present only at designated frame-to-pan, threshold-to-floor, and threshold-end joints; drainage openings remain open |
| Trim backing | Installed without interrupting rainscreen drainage or cladding support continuity |
| Interior air seal | Backer rod, sealant, or foam installed without bowing the frame; door remains operational during and after installation |
| Documentation completeness | Photographs and records of every concealed detail completed before rainscreen or siding installation begins |
E. Document Review and Pre-Flashing Verification (Steps 1–3)
- Review the door, WRB, flashing, head-flashing, threshold-sealant, and trim-system instructions. Confirm the flashing sequence, tape widths, primer requirements, head-flashing detail, interior air-seal method, and prohibited sealant locations before beginning.
- Recheck door frame plumb, square, reveal, latch, threshold bearing, and operation before concealing fasteners or shims. Do not proceed if any Project 08 acceptance condition has changed.
- Confirm that the sill-pan drainage path remains open. Inspect the sill pan visually for debris, damage, or an unintended seal before covering it with jamb flashing.
F. Jamb and Head Flashing Installation (Steps 4–9)
- Clean and prime jamb, flange, frame, sheathing, and WRB surfaces where required. Observe the primer manufacturer's specified open time before applying flashing.
- Install jamb flashing from bottom to top with the required overlap onto the sill-pan upturns. Begin at the sill-pan upturn and work upward so each higher piece overlaps the piece below it.
- Maintain full contact without bridging gaps or pulling the frame out of alignment. Roll the flashing with a J-roller and recheck frame plumb after each jamb is complete.
- Install rigid or flexible head flashing with the required end dams, projection, and extension beyond the jambs. Confirm the head flashing is level before fastening or adhering it.
- Integrate the WRB head flap over the head flashing in shingle-lap order. Fold the head flap down over the head flashing so water sheds outward onto the flashing, not behind it.
- Tape or patch flap cuts using the approved sequence. Treat every WRB cut made to accommodate the door opening as a discontinuity requiring patching.
G. Sealant, Trim Backing, and Interior Air Sealing (Steps 10–15)
- Seal designated frame-to-pan, threshold-to-floor, and threshold-end joints with compatible sealant. Apply sealant only at the joints identified on the sealant schedule.
- Keep the sill-pan outlet and any threshold weeps open. Inspect the drainage path immediately after sealant application to confirm it remains clear.
- Install approved exterior trim backing, furring, or mounting support without interrupting drainage. Position backing so it does not bridge or block the rainscreen cavity.
- Integrate trim backing with the rainscreen or cladding support system where applicable. Confirm the backing aligns with the furring plane established in Project 10.
- From the interior, air-seal the frame-to-rough-opening gap using the approved backer rod, sealant, or low-expansion foam. Install backer rod to the controlled depth before applying sealant, or dispense foam in the bead size specified by the manufacturer.
- Recheck door operation during and after air-seal installation. Confirm the door swings freely and the latch engages without binding as the foam or sealant cures.
H. Inspection and Documentation (Steps 16–19)
- Inspect all jamb laps, head flashing, threshold seals, sill drainage, interior air seal, and trim support. Compare each condition against the Acceptance Standards table.
- Correct reverse laps, open corners, blocked drainage, incompatible sealant, bowed jambs, or failed adhesion. Remove and replace any failed section rather than adding material over a defective layer.
- Conduct only the approved localized water-control observation or test after products have reached the required condition. Follow the approved protocol, cure-time requirement, and interior monitoring method for the observation.
- Document the completed concealed door-flashing assembly with photographs and records. Label each photograph with the door location and the detail shown before rainscreen installation begins.
Common Verification Inspection
Inspect the completed door-flashing assembly using the same checks regardless of door location.
- Door-condition check: confirm plumb, square, reveal, latch, and threshold bearing remain within the Project 08 acceptance standard.
- Jamb-flashing check: confirm bottom-to-top order, full contact, and required overlap onto the sill-pan upturns.
- Head-flashing check: confirm end dams, projection, extension beyond jambs, and WRB head-flap integration.
- Sealant check: confirm sealant is present only at designated joints and drainage openings remain open.
- Trim-backing check: confirm backing does not interrupt rainscreen drainage or cladding support continuity.
- Air-seal check: confirm the interior perimeter gap is sealed without bowing the frame and the door remains operational.
Complete the Door-Flashing Inspection Record in the Inspection Checklist section below before beginning Project 10.
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Failure Points and Troubleshooting
Cleanup
This project ends with a flashed, drained, air-sealed, and operational exterior-door installation, documented and ready for rainscreen furring, not with siding or trim installed.
- Remove masking materials, primer residue, and excess sealant from the frame, flashing, and surrounding WRB
- Clear cured foam trimmings and backer-rod offcuts from the interior perimeter gap and floor area
- Confirm the sill-pan outlet and threshold weeps remain visibly open before leaving the site
- Store the door-flashing inspection record and supporting photographs with the project's permanent documentation
- Communicate any open discrepancy and its required decision to the responsible design professional or general contractor before Project 10 begins
Field Terms
- Frame Flange
- The door-frame surface or attached flange that receives jamb and head flashing layers.
- End Dam
- A raised or formed head-flashing component that directs water inward away from the jamb.
- Sill-Pan Upturn
- The vertical leg of the sill pan that extends up each jamb and receives the jamb flashing overlap.
- WRB Head Flap
- The section of water-resistive barrier above the opening that is integrated over the head flashing.
- Designated Joint
- A joint identified by the sealant schedule as requiring sealant.
- Interior Air-Seal Gap
- The perimeter gap between the door frame and the rough opening, sealed from the interior.
- Shingle-Lap Order
- The bottom-to-top installation sequence in which each higher layer overlaps the layer below it.
- Trim Backing
- Approved furring or blocking installed to support exterior trim without interrupting rainscreen drainage.
- Localized Water-Control Observation
- An approved, protocol-based check of a completed detail's water-shedding performance, conducted under defined conditions.
- Door-Flashing Inspection Record
- The document recording flashing dimensions, sealant locations, air-seal method, deficiencies, corrections, and photographs for one door opening.
Skill Check
- Why must the door's plumb, square, reveal, and operation be rechecked before jamb flashing begins, rather than relying on the Project 08 record alone?
- What is the required order of installation among the sill pan, jamb flashing, and head flashing, and why does that order matter?
- What must be verified about head-flashing projection and end dams before the WRB head flap is integrated over it?
- Which joints are designated for sealant in this project, and which openings must remain unsealed?
- Why must interior air sealing be treated as separate from exterior drainage rather than as a substitute for it?
- What must be checked immediately after low-expansion foam or sealant is installed at the interior perimeter gap?
- What condition indicates a reverse lap at the WRB head flap, and why is it a defect?
- Why must trim backing preserve the rainscreen drainage gap established in Project 10?
- What must occur before a localized water-control observation or test is conducted on this assembly?
- What must be documented before rainscreen furring is installed over this completed assembly?
Competency Rubric
| Competency | Independent Pass Standard | Not Demonstrated | With Assistance | Independently |
|---|---|---|---|---|
| BE-049 | Flashes door jambs from bottom to top with required overlap onto sill-pan upturns without bridging gaps or displacing the frame | |||
| BE-050 | Installs head flashing with required end dams, projection, and extension, correctly integrated with the WRB head flap | |||
| BE-051 | Seals only designated frame-to-pan and threshold joints while keeping sill-pan outlet and threshold weeps open | |||
| BE-052 | Integrates the WRB with jamb and head flashing in correct shingle-lap order and patches exposed discontinuities | |||
| BE-053 | Installs approved trim backing without interrupting drainage and air-seals the interior gap without affecting door operation | |||
| BE-054 | Inspects, corrects, and documents the completed concealed door-flashing assembly with photographs and records |
Mark one column per competency. Only Demonstrated Independently awards the competency; Demonstrated with Assistance authorizes additional supervised practice but does not complete the requirement.
Inspection Checklist — Door-Flashing Record
| Check | Plan Value / Requirement | Field Value | Within Tolerance (Y/N) | Correction (if any) |
|---|---|---|---|---|
| Door plumb/square/reveal/operation | Matches Project 08 acceptance record | |||
| Sill-pan drainage before covering | Open and undamaged | |||
| Jamb flashing overlap onto sill pan | Matches manufacturer-specified distance | |||
| Head-flashing projection beyond jambs | Matches manufacturer-specified distance | |||
| WRB head-flap integration | Shingle-lap order over head flashing | |||
| Sealant locations | Present only at designated joints | |||
| Sill-pan outlet/threshold weeps | Open and unobstructed | |||
| Trim backing and rainscreen gap | Drainage cavity preserved | |||
| Interior air seal | Installed without bowing frame; door operational | |||
| Documentation | Photographs and records complete before Project 10 |
Open discrepancies attached: ____________ Responsible authority for each: ____________
Assembly status: ______ (Proceed to Project 10/Conditional-Proceed/Stop-Work) Date: ____________ Installer name: ____________
Performance Check
With document review, jamb flashing, head flashing, WRB integration, designated sealant, trim backing, and interior air sealing complete, review the assembly against the Acceptance Standards table and confirm the door remains plumb, square, and operational, jamb and head flashing are correctly lapped and dimensioned, sealant is present only at designated joints with all drainage openings clear, trim backing preserves the rainscreen cavity, and the interior air seal does not affect operation. Complete and sign the door-flashing inspection record before rainscreen furring is installed in Project 10. If a discrepancy remains open, identify the responsible authority and required correction before proceeding.
Project Closeout
You have completed the ninth project in the building-envelope sequence: flashing and weatherproofing an exterior door. This project required you to flash door jambs with the required overlap onto the sill-pan upturns (BE-049), install head flashing with the required end dams and projection (BE-050), seal only the designated frame and threshold joints while keeping drainage open (BE-051), integrate the WRB with the flashing in correct shingle-lap order (BE-052), install trim backing and complete the interior air seal without affecting operation (BE-053), and inspect, correct, and document the completed assembly (BE-054).
You now have a flashed, drained, air-sealed, and operational exterior-door installation with a signed door-flashing inspection record. That decision carries directly into the next project: installing the rainscreen furring and drainage mat over the completed WRB and this door assembly.
Protect the completed jamb flashing, head flashing, sealant joints, and interior air seal established in this project. Project 10 installs rainscreen furring around this opening and depends on every drainage and clearance condition confirmed here.