Estimate Insulation and Air-Sealing Materials

A. Finished-Project Specification

Quantity: one insulation and air-sealing worksheet covering every wall, sound wall, attic, roof slope, cathedral ceiling, floor, rim, foundation, and mechanical-space assembly in the current project, with net quantities, purchase-unit conversions, air-sealing and vapor-control materials, accessory counts, labor, equipment, testing, pricing, and an independent reconciliation.

B. Assembly and Material Schedule (Component Schedule)

Assembly / Item	Basis	Measurement Method	Product Category	Preparation / Purpose
Exterior and sound walls	Section E, Steps 3–4, 7–8	Cavity area by type, height, opening rule	Batt, blown, board, or spray	Primary thermal and sound envelope
Attic floor / roof slope / cathedral ceiling	Section E, Steps 3, 5, 7	Actual geometry, obstruction-adjusted area	Batt, blown, board, or spray	Top-of-envelope thermal boundary
Floors, rims, crawlspace and basement walls, foundation	Section E, Steps 3, 6–7	Area by type and framing condition	Batt, board, or spray	Bottom-of-envelope and below-grade thermal boundary
Rigid insulation layers	Section F, Step 11	Board area, layer, joint layout, edge, waste	Rigid board	Continuous insulation or specified rigid application
Spray foam	Section F, Step 12	Approved yield, thickness, temperature, substrate	Spray	Only where specified; no assumed yield
Fire/thermal barriers, mesh, netting, supports, baffles, dams, markers	Section F, Step 13	Count and length by location	Accessory	Code-required coverings and containment
Air-sealing joints	Section F, Steps 14–17	Joint length/count at plates, rims, penetrations, openings, shafts, ducts, entries	Sealant, foam, gasket, membrane, tape, mortar	Continuity of the air barrier
Vapor-control material	Section F, Steps 18–19	Area with laps, transitions, penetrations, repair allowance	Membrane or facing	Only where specified; not added by assumption
Baffles, dams, hatch insulation, weatherstripping	Section F, Step 20	Count by location	Accessory	Attic ventilation and access-point control

C. Purchase-Unit and Waste Basis

• Batt and roll products: convert net cavity area into full and partial batts or roll length using the manufacturer's stated batt size or roll coverage; do not assume a generic coverage rate across different products.
• Blown-in products: convert installed area and target settled thickness into bag count using the manufacturer's installed-density coverage chart for the specific product and target R-value.
• Rigid board products: convert net board area into full sheet count using the specified board size, layer count, and joint layout, with waste applied for cuts and edge conditions.
• Spray foam: convert area and specified thickness into set or kit count using the manufacturer's approved yield at the documented temperature and substrate condition only.
• Sealant, foam, gasket, and tape: convert linear or unit joint counts into cartridge, can, or roll count using the manufacturer's stated yield or coverage per unit.
• Vapor-control membrane: convert net area plus laps, transitions, and approved repair allowance into roll count using the manufacturer's roll coverage.

D. Column and Formula Schedule

Column	Type	Formula Basis
Assembly, product, location, source	Input	Entered directly; source field required for every row
Net area / volume, unit	Input	Measured cavity, attic, roof-slope, or floor area or volume, with approved unit
Installed thickness / density	Input	From specification or manufacturer chart for the target R-value
Waste	Input	Approved waste percentage for the product, layout, and cut condition
Order quantity (bags, batts, boards, kits, rolls)	Formula	Net area or volume ÷ manufacturer coverage per package, × (1 + waste), rounded to full packages
Unit cost	Input	Dated price from a quotation or approved price source
Material cost	Formula	Order quantity × unit cost
Labor hours	Formula	Task quantity × production rate from the Chapter 17 basis where available
Labor cost	Formula	Labor hours × burdened labor rate
Equipment cost	Formula	Rental or ownership rate × duration, plus mobilization, fuel, and hose or machine charges
Row total	Formula	Material cost + labor cost + equipment cost

E. Preparation — Document Review and Assembly Definition

1. Review energy documents, sections, insulation notes, air-barrier details, specifications, and climate requirements. Confirm the applicable climate zone and code edition on the project-information sheet.
2. Identify thermal, air, vapor, ignition-barrier, fire-blocking, sound, and ventilation functions without redesign. Record each function next to its assembly on the assembly schedule; do not substitute a different function or product than specified.
3. Separate exterior walls, sound walls, attics, roof slopes, cathedral ceilings, floors, rims, foundations, and mechanical spaces. Create one assembly row for each on the assembly schedule.
4. Measure wall cavity area by type, height, and opening rule. Apply the approved opening-deduction rule from the workbook conventions and record the source for each measurement.
5. Measure attic floor or roof-slope area using actual geometry. Reconcile with the roof-slope area calculated in Chapter 7 where that chapter has already been completed for the same project.
6. Measure floors, rims, crawlspace walls, basement walls, and foundation insulation. Record area separately for each condition.
7. Identify cavity depth, framing spacing, narrow cavities, irregular spaces, and obstructions. Note each condition that will affect the installed method or require a specialty product.

F. Quantity, Purchase-Unit, and Air-Sealing Build Procedure

1. Select only specified or approved insulation type, density, thickness, facing, and method. Record the specification or approval reference for each assembly row.
2. Convert area or volume into bags, batts, rolls, boards, kits, or installed units using manufacturer coverage. Apply the Section C basis for the specific product.
3. Adjust blown-in quantities for installed density and settled thickness. Use the manufacturer's installed-density chart for the specified R-value; do not use a generic bag-per-square-foot rate.
4. Calculate rigid insulation by board area, layer, joint layout, edge, and waste. Record layer count separately where more than one layer is specified.
5. Calculate spray foam only from approved yield, thickness, temperature, and substrate basis. Do not calculate a spray-foam quantity without a documented yield source.
6. Identify fire or thermal barriers, coatings, mesh, netting, supports, baffles, dams, and markers. Count each by location and add to the accessory schedule.
7. Measure air-sealing joints at plates, rims, penetrations, openings, shafts, ducts, and service entries. Record each joint location, length or count, and condition on the air-sealing joint schedule.
8. Select sealant, foam, gasket, membrane, tape, mortar, or other compatible product. Confirm compatibility with adjacent materials before selection.
9. Calculate sealant and foam from joint geometry and yield. Apply the Section C sealant and foam basis.
10. Calculate tapes and membranes from length, width, overlap, corner, and penetration conditions. Record overlap and corner allowances separately from field area.
11. Measure vapor-control material with laps, transitions, penetrations, and repair allowance. Apply the Section C vapor-control membrane basis.
12. Do not add an unapproved vapor barrier. Confirm every vapor-control row traces to a specific specification reference before pricing.
13. Count attic baffles, wind dams, access dams, rulers, hatch insulation, and weatherstripping. Add each to the accessory schedule with location and quantity.

G. Access, Labor, Equipment, and Testing

1. Include PPE, ventilation, containment, masking, cleanup, and disposal. Record each as a separate line item where it carries its own cost.
2. Include lifts, scaffolds, crawlspace access, confined-work restrictions, and temporary lighting. Identify any access condition that will affect production rate.
3. Estimate labor by batt, blown, board, spray, membrane, air sealing, baffle, and inspection task. Separate labor rows by task type on the labor schedule.
4. Adjust production for height, congestion, occupancy, irregular framing, temperature, and testing. Record the adjustment basis for each affected task.
5. Include blower-door, depth, density, infrared, or other testing only when assigned. Do not add a testing line item unless the documents or scope require it.
6. Price products from dated sources confirming coverage, package, lead time, storage, and shelf life. Record the quotation date, source, and expiration for each priced item.
7. Include freight, minimum order, equipment rental, hose, machine, fuel, and crew requirements. Add each as a separate cost row linked to the affected assembly or task.

H. Reconciliation and Worksheet Assembly

1. Reconcile insulation area against conditioned-envelope geometry. Compare the sum of wall, attic, roof-slope, and floor areas against the building's overall conditioned-envelope dimensions using an independent method.
2. Compare package count with coverage and installed depth. Confirm each product's order quantity produces the specified installed depth or density when applied to the net area.
3. Prepare the worksheet by assembly, product, quantity, labor, equipment, testing, and total. Confirm every row links correctly to the workbook's Insulation cost-code section and summary sheets.

I. Closeout — Independent Review and Documentation

1. Complete independent review of area, coverage, depth, and air-sealing scope. Have a second reviewer or an independent recalculation confirm at least the highest-value assembly and the highest-risk air-sealing joint.
2. Document assumptions, exclusions, and unresolved product or coverage questions on the assumptions and risk register. Link each entry to the affected assembly row before the worksheet is treated as complete.