BANARTA
Calculate boards from usable area, then round to the agreed pack size. Keep three quantities separate: installed area, cutting allowance and extra boards caused by pack rounding. Combining them into one unexplained percentage makes both quotations and delivery checks harder.
Start with the right measured area
Measure each zone and layer separately. Use the agreed drawing revision and identify areas excluded from the insulation. If the design has two insulation layers, list both; a 100 m² floor with two layers is not a 100 m² board order. Different thicknesses or grades must remain separate order lines.
Confirm whether the quoted board dimensions are overall or effective installed dimensions. Profiled edges may change usable coverage. A preliminary area calculation also does not replace a cutting layout for narrow rooms, irregular boundaries or repeated small pieces.
Worked example: 100 m² in one layer
Assume, only for this example, a 1.2 m × 0.6 m board with 0.72 m² usable coverage, a chosen 5% cutting allowance, 50 mm thickness and 10 boards per pack. These are not Banarta specifications or a recommended allowance for every project.
| Step | Calculation | Result |
|---|---|---|
| Area including chosen allowance | 100 × 1.05 | 105 m² |
| Boards before pack rounding | 105 ÷ 0.72, round up | 146 boards |
| Whole packs | 146 ÷ 10, round up | 15 packs |
| Delivered board count | 15 × 10 | 150 boards |
| Delivered nominal coverage | 150 × 0.72 | 108 m² |
| Nominal board material volume | 150 × 1.2 × 0.6 × 0.05 | 5.4 m³ |
The 146 rounded boards represent 105.12 m². Whole-pack ordering adds another four boards, or 2.88 m². The full 8 m² above the measured area is therefore not all “cutting waste”. Some is the selected allowance and some is rounding.
Turn your board count into a comparable quote
Use your own project figures in this request: “Please quote [grade and thickness], [board dimensions], [edge profile], [number of layers] and [net area]. Confirm usable coverage per board, pieces per pack, total supplied pieces and packed dimensions for delivery to [destination].” Leave the pack size open until confirmed; the example above is not a packing offer.
Check how edge profiles change usable coverage, then request an XPS board quotation with your completed schedule.
Do not use material volume as shipping volume
The 5.4 m³ result excludes wrapping, pallets, spacing and packaging. Freight planning needs the supplier's packed length, width, height, pack count and gross weight. Ask whether pallets can be stacked and confirm access and unloading arrangements with the logistics provider. Do not promise a container quantity from board volume alone.
Adjust the allowance using the layout
For regular areas, an initial percentage may help budget an enquiry. Before approval, review perimeter cuts and whether offcuts can be used in the correct grade, thickness and orientation. Keep agreed spare boards as a separate line. Unusable damaged pieces should not be counted as project spares.
- Zone and drawing revision.
- Grade, thickness, edge profile and number of layers.
- Net measured area and confirmed usable board coverage.
- Cutting allowance and its stated reason.
- Boards per pack, ordered packs and delivered pieces.
- Packed dimensions, gross weight and delivery sequence.
Compare quotations on the same quantity basis
Ask suppliers to show both pieces and usable area. If one quotation rounds each zone to full packs and another combines identical products across zones, reconcile that difference before comparing totals. Keep separate products separate even if combining them would appear to reduce rounding.
Use the Banarta enquiry worksheet to record the order lines. Review XPS insulation boards and the supplier comparison guide, then send your schedule for a quotation. Confirm pack sizes and availability rather than relying on the example.
