Budget Draught-Seal Length for Every Opening — Free
Seal strips sell in packs; draughts live in millimetres. Convert each opening’s measured perimeter and sealing passes into the packs of seal the job actually consumes, before the third trip to the shop.
The proof surface
Draught-proofing priority orders decide which draughts to fix first. This prices the sealing material for the openings you have chosen, converting measured perimeter into whole packs and flagging openings that waste more than they use.
Why the flat version breaks
Measuring the visible gap instead of the sealed edge
Seal strips run along the frame edge, so the perimeter that matters is the one the strip contacts.
Ignoring the pack length at the shelf
Two short packs cost more and leave more offcut than one correctly sized pack.
Sealing ventilation gaps shut
Combustion appliances and trickle vents need their designed air; seal the draughts around moving edges, not the air the house breathes.
How to work the draught seal packet
Add the sides you will actually seal: a door sealed on three sides is its three sides, not the frame rectangle. A sash window sealed on both sashes takes passes over the meeting rails too.
One pass for a single-sided strip, two where both faces get sealed or the old strip is doubled. Perimeter multiplied by passes is the length the job eats.
Read the centimetres printed on the pack you plan to buy. Two hundred and fifty centimetres is a common retail pack; trade packs run longer.
The packet reports packs per opening and totals them, flagging any opening whose offcut waste passes thirty percent — usually a sign to buy the pack size that fits that opening instead of one size everywhere.
What the draught seal packet replaces
| Question | Before | Visible working |
|---|---|---|
| Measuring the visible gap instead of the sealed edge | Seal strips run along the frame edge, so the perimeter that matters is the one the strip contacts. | Count the sealing passes |
| Ignoring the pack length at the shelf | Two short packs cost more and leave more offcut than one correctly sized pack. | Set the pack length on the roll |
| Sealing ventilation gaps shut | Combustion appliances and trickle vents need their designed air; seal the draughts around moving edges, not the air the house breathes. | Round up per opening, then add one spare |
A local arithmetic aid replaces hand calculation, not expert review. No paid AI service is needed.
Run it on the samples, right here
FIRST-LOAD
Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Pack arithmetic on the measurements and pack size you supply. Not an energy audit, building-standard or ventilation assessment; confirm which gaps should be sealed with a qualified energy assessor or your building’s guidance before blocking any vent.
Data note: Everything runs in this browser tab on the draught seal packet: your opening | measured perimeter centimetres | sealing passes stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Go deeper: the companion app files the same reading as a stapled evidence packet
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the draught seal packet reading, and holds your drafts on this device — one free run, then $ 4 one-time for the layer that keeps filing.
The draught seal packet reading is complete for free. The optional $4 layer adds print, row CSV and the last five local reading summaries; it does not add hidden answers. Checkout is not configured yet; the article demo remains unlimited.
Open the budget draught-seal length for every opening companionBoundary
Pack arithmetic on the measurements and pack size you supply. Not an energy audit, building-standard or ventilation assessment; confirm which gaps should be sealed with a qualified energy assessor or your building’s guidance before blocking any vent.
What this is built on
- Method: Read the centimetres printed on the pack you plan to buy. Two hundred and fifty centimetres is a common retail pack; trade packs run longer.
- All sample records are invented examples. The app does not fetch measurements, policies, files or personal records.
- Google’s official pricing page, fetched 2026-09-29, lists free-tier access including AI Studio. Optional formatting only; limits and availability can change. Free-tier content may be used to improve products. Never paste private records there.
Before: Seal strips run along the frame edge, so the perimeter that matters is the one the strip contacts. After: the draught seal packet shows the working beside each named row so the reader can change the assumption and inspect the consequence.
Optional AI formatting, not calculation
For this draught seal packet, use the free AI Studio interface only if available to you, with no paid API key. Manual entry completes the same workflow for free. Supply only fictional or non-sensitive notes. Review its output against the source; never paste unresolved questions into the numeric rows.
Format my non-sensitive notes for a draught seal packet. Return plain rows only: opening | measured perimeter centimetres | sealing passes. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: opening | measured perimeter centimetres | sealing passes. No AI response is executed as code.