INSULATION · VILLAWOOD, NSW

From a ceiling sketch
to 16 packs on site.

An irregular ceiling footprint, three measured rectangles and a completed insulation job. Here is how Emir’s takeoff adds up.

Project records and photographs supplied by Emir · 8 October 2026

Ceiling area: 78.88 m²
Actual packs used: 16 packs
Product rating: R4.1 batts

The ceiling, before and after

Ceiling space before the reported insulation installation, with timber framing and existing material visible — Before installation. A view of the ceiling space from the supplied project photographs.

Insulation across the visible ceiling area after the reported installation — After installation. Emir confirmed that all 78.88 m² was insulated using 16 packs.

The photographs show the visible site condition. The total area and pack use come from the takeoff and Emir’s confirmation; they cannot be established from photographs alone.

01 · MEASURE THE FOOTPRINT

Three rectangles. No double-counting.

The sketch splits the ceiling into a main rectangle and two extensions. Each section is counted once. These are ceiling-footprint measurements, with no roof-slope factor applied.

To-scale ceiling diagram: main section 7.2 by 8.7 metres, top extension 4.8 by 2.3 metres and lower extension 4 by 1.3 metres — Redrawn to scale from the supplied dimensions. Dashed lines separate calculation areas, not walls. This is an explanatory takeoff diagram, not a survey.

Ceiling area calculation
Section	Working	Area
A · Main	7.2 × 8.7	62.64 m²
B · Top	4.8 × 2.3	11.04 m²
C · Lower	4.0 × 1.3	5.20 m²
Total ceiling area		78.88 m²

Check the dimensions two ways

The main width is 4.8 + 2.4 = 7.2 m, matching the lower chain of 3.2 + 4.0 m. Its height is 10 − 1.3 = 8.7 m. Adding the top extension gives the recorded left-hand height: 8.7 + 2.3 = 11.0 m.

These checks reconcile the sketch’s arithmetic. They do not independently verify the on-site measurements.

02 · CHECK THE PACK

Material area and installed coverage differ.

Bradford Gold R4.1 ceiling batt packaging photographed on site — The product label photographed on this job.

The packaging identifies Bradford Gold R4.1 ceiling batts, product code 111716.

Batt dimensions: 1160 × 430 × 215 mm
Batts per pack: 10
Material contained: 5.0 m² per pack
Stated coverage: 5.6 m², including timber
Labelled framing centres: 450 mm

Match the area you measured to the coverage basis on your pack. Deducting timber from the area and then allowing for it again through the coverage figure would count the same adjustment twice.

03 · COMPARE WITH THE JOB RECORD

16 packs used. The full area insulated.

At the pack’s stated 5.6 m² coverage, 78.88 ÷ 5.6 = 14.09, or 15 whole packs before an additional allowance, if that coverage basis is appropriate to the installation. This is an illustrative calculation, not the original order record.

Emir confirmed 16 packs used and the full 78.88 m² insulated. No leftover quantity or deliberate waste allowance was recorded, so the difference is not described as a measured waste percentage.

R4.1 identifies the photographed product. This case study does not claim a verified whole-ceiling R-value, installation certification or measured energy savings.

Explore the nominal pack calculation

Opens 78.88 m², 5.6 m² per pack and 0% extra allowance. Replace these with the correct values for your own project.

What to take into your next job

Break the footprint into measured sections, reconcile the dimensions, read the exact pack label and keep the estimate separate from the quantity actually used.

Written for Job Totals from Emir’s project records. Product specifications are transcribed from the supplied packaging photograph.

The ceiling, before and after

Three rectangles. No double-counting.

Check the dimensions two ways

Material area and installed coverage differ.

16 packs used. The full area insulated.

Try the recorded inputs.