THE SHORT ANSWER
Estimate air sealing from identified openings and joint lengths, with access and material selection described. Keep the sealing scope separate from insulation, testing and repair of unknown cavities.
This Australian walkthrough uses a fictional defined penetrations in one roof space in Sydney, New South Wales. The matching roof space air sealing estimate example shows the same item quantities and amounts in an app-exported PDF. Measure your own site and replace the example rates before issuing a client quote.
1. Mark the openings
Count the penetrations and measure the specific joints planned for treatment. A vague roof space-wide line makes it difficult to verify what the crew will actually seal.
For this example, the agreed starting scope is: Seal 18 accessible small roof space penetrations and 36.58 m of agreed top-plate joints after a site review. Include temporary insulation movement, approved sealant material allowance, application labour, documentation and cleanup. No new insulation or concealed opening repair. A change to a listed surface, product or access assumption should trigger a revised line or allowance.
2. Identify access and preparation
Existing insulation may need careful movement and replacement around work locations. The example allows that effort without assuming wholesale insulation removal.
3. Choose suitable materials
Match sealant and backing to the actual assembly and applicable requirements. The fictional material allowance must be replaced with a job-specific product list.
4. Define evidence at handoff
Record the treated locations and the limited documentation included. Any diagnostic testing or new insulation should be a distinct scope with its own quantities.
Worked roof space air sealing calculation
Two checkable lines from the example are 18 each × A$53.20 = A$957.60; 36.58 m × A$20.50 = A$749.89. The full 6-line estimate totals A$2,743.49 with the demonstration tax input at 0%. The amount is a fictional scenario, not an Australian market rate or a recommended selling price.
Material purchasing and installed quantities may differ. For your own estimate, use the actual takeoff, supplier prices, labour plan, access and disposal requirements. Decide how overhead, profit and the applicable tax treatment affect your final quote; do not copy the example's zero tax setting.
Before you share the estimate
- Map and count accessible openings.
- Measure joint lengths.
- Review material and assembly requirements.
- Separate testing and insulation.
Scope boundary in this example: No blower-door testing, new insulation, concealed cavity repair, ventilation change or hazardous-material handling.
Confirm the client details and location, item descriptions, measured units, total and validity date. If opening up the work reveals a different condition, document the changed scope and price before proceeding.
Common questions about roof space air sealing
Can roof space air sealing be priced by floor area?
Area gives context, but identified openings, joint lengths and access define this example scope.
Is insulation part of air sealing?
Only if separately listed. This sample moves existing material temporarily but does not add new insulation.
FROM SCOPE TO PDF
Make your own roof space air sealing estimate.
Describe the actual job in Estimates on iPhone or Android, then review every quantity, rate and scope note. Add your business and client details, check the document and share an itemised PDF. Example amounts are fictional, and some app features may require an in-app purchase.
