Insulation Estimating and Takeoff Services

We quantify insulation by assembly and specified R-value — cavity insulation net of framing, continuous insulation outboard of the sheathing, and air sealing as its own scope — and deliver an editable Excel workbook with the marked-up plan set.

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What We Take Off

Insulation used to be batts between studs. Energy codes moved it, and a current wall assembly is frequently cavity insulation plus continuous insulation outboard of the sheathing plus an air barrier plus the longer fasteners and thermal clips that hold it all together. Estimating that as a single square footage of batt is how this package gets underpriced, and the continuous layer is usually the larger half.

Cavity insulationby area and specified R-value, separating fibreglass batt, mineral wool, blown and dense-pack cellulose, with the framing factor applied so the quantity reflects the cavity rather than the wall

Continuous insulationboard outboard of the sheathing by area, thickness and type, separating polyiso, XPS, EPS and mineral wool board, since each has a different R per inch and a different cost

Thermal clips and fastening for continuous insulationthe extended fasteners, clips or girts the assembly requires, which are a real hardware cost that a board area does not report

Spray polyurethane foamby area and thickness with open-cell and closed-cell separated, since the R per inch, the vapour behaviour and the price are all different

Air sealingsealant, tape, gaskets and foam at every joint, penetration and transition, quantified as its own scope because it is a specified performance requirement with a real labor content

Air barrier membranewhere the assembly includes a separate air barrier, by area including laps with the transitions at openings, foundation and roof detailed individually

Vapour retarderby area and class where specified, with the placement in the assembly stated, since this is a climate-dependent decision rather than a default

Roof and attic insulationbatt, blown, board or a combination by area and R-value, with baffles, dams at penetrations and access hatch insulation counted

Below-grade and under-slab insulationperimeter, foundation wall and under-slab board by area and thickness, which is a growing energy code requirement and easy to overlook

Acoustic insulationby area against the assemblies that actually specify it, separated from thermal scope because it is driven by the wall type schedule rather than the envelope

Fire-rated and safing insulationperimeter fire containment at slab edges by linear foot, fire-rated joint systems, and mineral wool where the rated assembly requires it

Mechanical insulationduct, pipe and equipment insulation where this package carries it, by linear foot and size with the jacket type specified

Rated penetration and firestop interfacewhere insulation meets a rated assembly, quantified against the referenced UL detail

Thermal bridging mitigationquantified where the specification addresses it at slab edges, balconies, parapets, shelf angles and framing members

Blower door and testing requirementswhere the project has an air leakage target, the testing and the remedial sealing allowance it implies

Access and difficult conditionscrawl spaces, attics, high walls and work above ceilings, quantified separately because productivity is not comparable to open wall work

How Insulation Quantities Are Measured

Every quantity below is reported in the unit the scope is actually bought and bid in — not converted into a single convenient unit that hides where the cost sits.

Cavity insulationSF net of framingThe cavity, not the wall. A 16-inch-on-centre wall is meaningfully less cavity than its gross area, and a 24-inch one is more.

Continuous insulationSF by thickness and typeGross area outboard of the sheathing, quantified separately from cavity because it is a different material and a different operation.

Thermal clips and fastenersEA at specified spacingThe hardware holding the continuous layer. Real cost that a board area figure does not report at all.

Spray foamboard feet or SF by thicknessOpen-cell and closed-cell separated. Different R per inch, different vapour behaviour, different price.

Air sealingLF by joint typeMeasured at joints, penetrations and transitions rather than allowed for. It is a specified performance item with real labor.

Air barrier membraneSF including lapsGross with laps, with transitions counted as their own detailed conditions.

Roof and atticSF by R-valueWith baffles, dams and hatch insulation counted as separate items.

Under-slab and perimeterSF by thicknessAn increasing code requirement and one of the more commonly missed lines in the package.

Acoustic insulationSF by assemblyAgainst the wall type schedule, which is where it is specified, rather than across all partitions.

Safing and perimeter fire containmentLF at slab edgeBy linear foot against the rated detail. A separate system from thermal insulation entirely.

Mechanical insulationLF by pipe or duct sizeWith jacket type, where this package carries it rather than the mechanical subcontract.

Difficult accessSF by conditionCrawl space, attic and above-ceiling work split out, because productivity there is not open-wall productivity.

Who This Is For

General contractors carrying this trade directly, or checking a subcontractor's number before it goes into the bid.

Subcontractors pricing their own scope in this division.

Developers and owners validating a number they've already been given.

Material suppliers and distributors verifying a customer's order.

What You Receive

An itemized Excel takeoff, organized by division
A marked-up plan set — every quantity traces back to a location on the drawings
Labor, material and equipment split out separately
Waste and overage factors shown as visible line items
An assumptions and exclusions schedule

Marked-up insulation plan crop

What Moves the Number on Insulation

Continuous insulation, which is now the larger half. Energy codes have pushed insulation outboard of the framing, and a current exterior wall frequently carries more R-value in continuous board than in the cavity. That board needs its own fastening — extended fasteners, clips or girts — and a longer fastener through several inches of insulation is a different item from a standard one. Estimating the assembly as cavity batt alone misses most of it.

The framing factor. Cavity insulation fills the cavity, not the wall, and the framing occupies a real and calculable share of a wall's area — more at 16 inches on centre than at 24, and more again around openings and at corners where studs bunch. Using gross wall area overstates the material and, more importantly, hides the thermal bridging the specification may be asking you to address.

Air sealing as a performance requirement. Where a project has an air leakage target, sealing is not an incidental item — it is sealant, tape, gaskets and foam at every joint, penetration and transition, plus the testing and the remedial work if the building does not pass. That is real scope with real labor, and it appears in the specification rather than as a quantity on a drawing.

Material system. Fibreglass batt, mineral wool, cellulose, open-cell foam, closed-cell foam and rigid board differ in R per inch, in installed cost, in fire performance and in vapour behaviour. Substituting one for another to hit an R-value changes the thickness, the assembly and sometimes the vapour control strategy, so we price what is specified and state it.

Access and building type. Insulating an open stud wall before drywall is the fastest condition in this trade. Crawl spaces, low attics, work above finished ceilings and high walls off staging are not comparable, and on a renovation the majority of the work may be in exactly those conditions.

Fire-rated and perimeter containment scope. Safing at slab edges, perimeter fire containment and mineral wool in rated assemblies are engineered systems tested as assemblies, priced by linear foot against a referenced detail. They sit in the same package as thermal insulation and behave nothing like it.

Sequencing with other trades. Insulation goes in after rough-in and before close-in, in a window that other trades control. Partial installation, return visits to insulate after a late MEP change, and standby waiting on inspection are real costs on a compressed programme.

What We Need From You

A complete set is ideal, but rarely what exists. Send what you have — we will tell you at quote stage what can be quantified firm and what has to be an allowance.

Wall sections and envelope details showing the full assembly, layer by layer
Wall type schedule, for cavity and acoustic insulation by assembly
Specification section for Division 07 thermal insulation and the air barrier
Energy code compliance documentation or the specified R-values and assembly U-factors
Roof and floor sections, for roof, attic, under-slab and perimeter insulation
Life-safety plans, for rated assemblies and perimeter fire containment locations
Reflected ceiling plans, for above-ceiling and plenum conditions
Any air leakage target and testing requirement stated in the specification

How It Works

1 Send your plans — PDF, DWG, DOC, images or ZIP, up to 100MB per file.
2 Get your quote — a flat price for the scope with a delivery date, confirmed in writing.
3 Approve — nothing starts until you confirm.
4 We take it off — quantities from the drawings and schedules.
5 Delivery — workbook, marked-up set, assumptions schedule.

How Pricing and Turnaround Work

Every project is priced individually from your drawings. Send the plan set and you get a flat quote for the scope before any work starts — no hourly billing, no open-ended engagement.

Turnaround depends on the size of the package and how many trades are in scope — which is why you get a firm delivery date with your quote rather than a generic promise.

Tools and Standards

Takeoffs are produced in Bluebeam, PlanSwift, Trimble, STACK, organized against CSI MasterFormat divisions — this scope is specified under Division 07 — Thermal and Moisture Protection (07 21 00 Thermal Insulation).

Quantities and assemblies are read against the published standards that govern this trade, because the standard is what decides whether two apparently identical items are actually the same line item:

ASTM C665 — mineral fibre blanket thermal insulation for light frame construction
ASTM C1289 — faced rigid cellular polyisocyanurate thermal insulation board
ASTM C578 — rigid cellular polystyrene thermal insulation
ASTM C1015 / C1149 — installation of loose-fill and sprayed fibre insulation
ASTM E2178 / E2357 — air permeance of materials and air leakage of air barrier assemblies
ASTM E779 / ASTM E1827 — building air leakage testing by fan pressurisation
ASTM E2307 — perimeter fire barrier systems at the slab edge
The applicable energy code in force for the permit date, which sets the required R-values and continuous insulation provisions

Pricing is built on RSMeans cost data localized to your project's market, then reconciled against current supplier quotes and our own completed project costs. Every estimate states its pricing basis and the date it was priced.

Why Insulation Is Estimated Wrong

Continuous insulation missed entirely. The defining error in current insulation estimating. A wall assembly with continuous board outboard of the sheathing carries a whole second insulation layer plus its fastening hardware, and an estimate built on cavity batt alone can be short by more than half the package. The information is in the wall section, not the floor plan.

Gross wall area used for cavity insulation. Batt fills the cavity. Using gross wall area overstates material, and more seriously it papers over the framing factor that the energy compliance path may be relying on being addressed. The correct quantity is net of framing at the actual stud spacing.

Air sealing carried as incidental. Where an air leakage target exists, sealing is a specified performance requirement with sealant, tape, gaskets and foam at every joint and penetration, plus testing and the remedial work if the first test fails. Treating it as part of the insulation rate prices none of it.

Fastening for continuous insulation forgotten. Board outboard of the sheathing has to be held by something. Extended fasteners, thermal clips or girts are a real hardware quantity at a specified spacing, and they are absent from any estimate that treats the board as an area and nothing more.

Under-slab and perimeter insulation overlooked. An increasing energy code requirement that sits on foundation sections rather than on wall sections, and is therefore easy to miss entirely when working from the architectural set alone.

Safing priced as thermal insulation. Perimeter fire containment at slab edges is a tested assembly with its own materials, its own linear foot rate and its own inspection. Rolling it into the thermal insulation area rate understates it substantially and misrepresents what was priced.

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Frequently Asked Questions

Do you quantify continuous insulation separately from cavity?

Yes, always — they are different materials, different operations and increasingly the continuous layer is the larger half of the package. We also quantify the extended fasteners, thermal clips or girts holding it, which are a real hardware cost that a board area figure does not report.

How do you handle the framing factor?

Cavity insulation is measured net of framing at the actual stud spacing rather than as gross wall area, with additional framing at openings and corners accounted for. Gross area overstates the material and obscures the thermal bridging the energy compliance path may be relying on.

Do you price air sealing?

Yes, as its own scope where the specification calls for it. Sealant, tape, gaskets and foam at joints, penetrations and transitions, measured by condition, plus blower door testing and a stated remedial allowance where the project has an air leakage target.

Do you include perimeter fire containment and safing?

Yes, by linear foot at the slab edge against the referenced tested detail, quantified separately from thermal insulation. It is an engineered assembly with its own materials and inspection and it does not behave like a thermal area rate.

Do you estimate spray foam?

Yes, by area and thickness with open-cell and closed-cell kept separate. They differ in R per inch, in vapour permeance and in price, so the assembly they are used in has to be priced to what is specified rather than to whichever is cheaper.

Do you account for difficult access?

Yes. Crawl spaces, low attics, work above finished ceilings and high walls off staging are quantified separately from open-wall work, because the productivity is not remotely comparable and on renovation projects the difficult conditions can be most of the job.

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