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Generating your insulation take-off
The insulation take-off is a procurement schedule: it answers "which insulation product goes where, and how much do we order?" It is generated from the same plan take-off as your H1 report, so the quantities come from measured areas, not a separate estimate.
Click Insulation take-off on the H1 page to produce it as a PDF. (Prefer a spreadsheet? Export CSV next to it downloads the construction and insulation schedule for Excel.)
What it is for
The H1 report proves thermal compliance. The insulation take-off is its procurement sibling: a buildable, orderable list of the insulation each element needs. It is the bridge from "the design complies" to "here is what to buy."
What it contains
The schedule is grouped by element (Roof / ceiling, Walls, Slab-on-ground floor, Suspended / other floor), with a row per element area:
| Column | What it shows |
|---|---|
| Construction | The element the insulation goes into. |
| Insulation product | The insulation product from the element's assembly. |
| R-value | Its R-value. |
| Structure & spacing | The framing layout the insulation fits into. |
| Pitch | For pitched roofs, the pitch behind the sloped-area conversion. |
| Area (m²) | The measured area from the plan take-off. |
A separate Insulation quantity summary page then totals each product across the whole building - Insulation product, R-value, Measured (m²), Allowance (the waste percentage applied), and Order (m²) (measured area plus that allowance, rounded up to the next whole square metre). That last column is the number you actually order.
Pitched roofs
Where a roof is pitched, the schedule notes that the measured areas are sloped surface areas (the real area of insulation to buy, not the plan footprint) and shows the conversion applied for each pitch. This is why setting the pitch on the take-off matters for procurement as well as compliance.
The standing assumptions
The take-off states its assumptions on the page, including:
- areas are net measured construction areas from the plan take-off, before deductions for services penetrations;
- order quantities apply a waste and offcut allowance that defaults to 10% but is configurable (0-100%) under Settings → Report - the allowance you set flows into the order-quantity roll-up (on both the take-off PDF and the exported CSV) and is added to the measured area before rounding up to the next whole square metre;
- products are assumed installed to manufacturer instructions (friction-fit batts fully filling the cavity, no gaps or compression);
- a product substitution changes both the thermal result and the quantities - re-check the H1 report after a change;
- the take-off is a procurement aid, not a replacement for the H1/AS1 report, the architectural drawings, or the manufacturer's requirements.
Insulation outside the thermal envelope (garages)
Builds often insulate spaces that sit outside the declared thermal envelope — most commonly an attached garage's own ceiling and external walls, priced as a client option. Those areas must never enter the H1 calculation, but the installer still needs their quantities.
Mark the element row Take-off only (outside envelope) from its ⋯ menu (or tick "take-off only" on a region in Derive from walls). A take-off-only element:
- is excluded from the H1 heat-loss calculation, the live verdict, and every table of the H1 compliance report;
- stays on the plan with its colour — the legend labels it "(outside envelope)";
- appears on the insulation take-off under its own Outside thermal envelope section, with a separate order-quantity roll-up so the scope can be priced (or declined) on its own.
The wall between the house and the garage is different: it is part of the thermal envelope (leave it as a normal wall row), as is a floor over a garage. Only the garage's own shell — and anything else insulated purely for comfort outside the envelope — should be marked take-off only.
Keeping it in step with the design
The take-off reads from the current design. Swap a product or re-measure an element and re-generate both the H1 report and the take-off so the two stay consistent.