Capstone Project: Air-Seal and Insulate a Small Practice Structure

A. Finished-Project Specification

Deliverable: one small practice structure with continuous air sealing at framing joints, service penetrations, and attic bypasses; protected attic ventilation and heat-source clearances; complete wall, window/door-perimeter, floor, crawlspace, and rim-joist insulation; continuous insulation and vapor-control layers installed only where the approved design requires them; duct-adjacent air sealing and insulation preserving service access; an insulated, weatherstripped attic hatch; loose-fill or added attic insulation to the approved depth and quantity; a completed final thermal-envelope quality inspection; and a formal documented handoff to Book 11.

B. Capstone Phase Schedule

Phase	Governing Chapter(s)	Primary Output
Readiness and hazard review	Chapters 1, 2, 18	Confirmed dry-in, rough-in inspections, moisture-readiness review, work-zone setup
Air sealing	Chapters 3, 4, 5	Continuous sealed framing joints, service penetrations, and attic bypasses
Ventilation and perimeter insulation	Chapters 6, 9	Installed attic baffles, eave dams, and sealed window/door perimeters
Cavity, floor, and continuous insulation	Chapters 7, 8, 12, 13, 14	Filled wall cavities, floor/crawlspace/rim-joist insulation, taped rigid-foam seams
Vapor control, ducts, and access	Chapters 15, 16, 17	Installed vapor retarder at its designated location, sealed duct areas, insulated attic hatch
Attic insulation	Chapters 10, 11	Depth markers, access dams, and loose-fill insulation to the approved quantity and depth
Final inspection and handoff	Chapter 19	Deficiency correction, testing, documentation, readiness status, formal handoff

C. Acceptance Standards

Check	Standard
Moisture readiness	Every active water source identified in the Chapter 18 method is corrected and confirmed dry before any insulation phase begins
Air-sealing continuity	Framing joints, service penetrations, and attic bypasses are continuously sealed per each governing chapter's acceptance standard
Ventilation and clearance	Soffit-to-attic ventilation is continuous, and no insulation or sealant enters a prohibited heat-source clearance zone anywhere in the structure
Insulation fit	Every cavity, floor, rim-joist bay, and continuous-insulation area is filled to full depth without gaps, voids, or damaging compression
Vapor-control placement	The vapor retarder appears only at its approved location, with no unapproved double low-permeance layer created anywhere in the assembly
Duct and access preservation	Duct insulation, condensate drainage, and all filters, dampers, shutoffs, cleanouts, junction boxes, and equipment remain reachable
Attic hatch	The hatch operates smoothly, its weatherstripping is fully compressed around the perimeter when closed, and its insulation is intact
Final readiness status	An approved, conditional, or rejected readiness decision is issued and documented before drywall handoff, with every deficiency corrected and reinspected

D. Preparation — Readiness, Rough-In Verification, and Moisture Review

1. Obtain the approved capstone energy plan, insulation schedule, air-barrier details, vapor-control strategy, attic-ventilation plan, service-penetration schedule, fire-clearance details, and inspection sequence. Record the source and date of each document reviewed.
2. Confirm that the structure is dried in and that roofing, WRB, windows, doors, and exterior penetrations are complete. Walk the full exterior and record confirmation before proceeding.
3. Confirm that plumbing, electrical, and HVAC rough-ins have passed required inspections. Record the inspection dates and inspector or authority for each trade.
4. Complete the moisture-readiness review and correct all active water sources. Apply the Chapter 18 diagnostic method to the entire structure and confirm drying before continuing to the next phase.

E. Inspection, Hazard Identification, and Work-Zone Setup

1. Inspect framing, sheathing, cavities, attic, floor, rim joists, services, and access points. Use the Chapter 1 inspection method across the entire structure and record findings by area.
2. Identify hazardous materials, damaged wiring, non-IC lights, chimneys, flues, exhaust ducts, and other stop-work conditions. Record each condition, exclude the area if required, and refer it to the appropriate qualified professional.
3. Establish work zones, PPE, dust controls, ventilation, access paths, and material staging. Apply the Chapter 2 work-area setup across the full structure for the duration of the capstone.
4. Mark the complete thermal and air-control boundaries. Walk the structure and mark the intended boundary line on framing, attic, and floor surfaces before beginning any sealing or insulation work.

F. Air Sealing

1. Air-seal top plates, bottom plates, corners, doubled framing, sheathing joints, and floor transitions. Apply the Chapter 3 procedure and acceptance standard to every assigned framing joint.
2. Seal plumbing, electrical, and mechanical penetrations with compatible systems. Apply the Chapter 4 procedure, selecting materials appropriate to each service and fire requirement.
3. Block and seal attic bypasses, dropped soffits, chases, and partition tops. Apply the Chapter 5 procedure, installing rigid backing where required.
4. Install noncombustible blocking and clearance dams at heat-producing penetrations. Confirm every chimney, flue, and other heat-producing component maintains its required clearance before continuing.

G. Ventilation and Perimeter Insulation

1. Install attic baffles and eave insulation dams. Apply the Chapter 6 procedure at every vented rafter or truss bay in the approved design.
2. Verify continuous soffit-to-attic ventilation. Confirm airflow continuity from each exterior intake through its baffle to the attic air space before installing attic insulation.
3. Insulate window and exterior-door perimeter gaps without affecting operation or drainage. Apply the Chapter 9 procedure at every window and exterior door included in the capstone scope.

H. Cavity, Floor, and Continuous Insulation

1. Install fiberglass or mineral-wool batts in wall cavities according to the approved schedule. Apply the Chapter 7 or Chapter 8 procedure as specified for each wall section.
2. Fit insulation around wiring, boxes, pipes, braces, headers, and corners. Confirm full-depth contact and no compression at every service penetration within each cavity.
3. Install floor, crawlspace, or rim-joist insulation included in the capstone design. Apply the Chapter 12 and Chapter 13 procedures, confirming the crawlspace moisture strategy is followed.
4. Install rigid-foam panels or inserts where specified. Apply the Chapter 14 procedure for layout, cutting, and fastening.
5. Tape seams and seal edges to the adjoining air-control layer. Confirm continuity between the rigid-foam layer and the surrounding air barrier.

I. Vapor Control, Duct Areas, and Attic Access

1. Install the approved vapor retarder only at its designated location. Apply the Chapter 15 procedure, confirming the location matches the approved capstone assembly design rather than a general climate assumption.
2. Air-seal and insulate around ducts while preserving access, condensate, and duct insulation. Apply the Chapter 16 procedure at every duct area in the capstone scope, coordinating with Book 9 records.
3. Build and install the insulated attic hatch or access cover. Apply the Chapter 17 procedure, confirming perimeter weatherstripping compression and stable operation.
4. Prepare the attic for loose-fill insulation. Confirm baffles, dams, and clearances from Sections F and G remain intact before proceeding to attic insulation.

J. Attic Insulation

1. Install depth markers, access dams, equipment guards, and service labels. Apply the Chapter 10 preparation procedure across the full attic area.
2. Install loose-fill or added attic insulation to the approved product quantity and depth. Apply the Chapter 10 or Chapter 11 distribution procedure, tracking bag count against the approved coverage chart.
3. Keep ventilation paths, heat clearances, access, and equipment platforms open. Confirm no loose-fill material has blocked a baffle, dam, or required access point.

K. Final Inspection, Testing, and Documentation

1. Inspect all cavities, seams, penetrations, clearances, baffles, ducts, and service points. Apply the Chapter 19 final inspection method to the complete structure.
2. Correct gaps, compression, blocked ventilation, poor seals, unsupported batts, and damaged vapor layers. Address every deficiency identified during the final inspection.
3. Perform required air-leakage or thermal testing under the approved plan. Conduct blower-door, infrared, or other specified testing only under the approved test conditions.
4. Prepare the final deficiency list. Record location, condition, required correction, responsible party, and reinspection method for every remaining item.
5. Correct and reinspect every item. Confirm each deficiency is resolved before proceeding to documentation.
6. Photograph all concealed work before drywall. Capture every area that will be hidden once enclosure begins.
7. Compile product labels, quantities, coverage, depth readings, test results, inspections, and corrections. Assemble the complete capstone record.
8. Complete the thermal-envelope readiness inspection. Issue an approved, conditional, or rejected decision, with conditions stated for any conditional status.

L. Handoff and Protection

1. Issue the formal handoff to Book 11 for drywall installation. Deliver the complete capstone record along with the readiness decision.
2. Protect the completed insulation and air-sealing work until enclosure by the next trade. Prevent disturbance, moisture exposure, or compression of the finished thermal enclosure until drywall installation begins.