A tape measure gives planes. A merchant needs sheets by length, flashings by the metre, and a named profile. The longrun takeoff guide is what belongs on that list. This page is the measurement pack that feeds NZ Roof Tools.
Record each plane, not one footprint
Name house, garage and porch. For each: plan length along the ridge, eave-to-eave span, pitch in degrees, eave overhang, barge/verge overhang, form (gable / skillion / hip), valley count.
Sheet run is slope length: horizontal run including the eave drip, divided by cos(pitch). Mark whether a number is plan, site, or calculated. Mixing a 4.2 m plan run with a 4.2 m slope produces short sheets. The area calculator and rafter calculator show that difference.
Eave overhang needs a reference point (fascia, outer rafter, wall line). A 50 mm verge error on a long ridge is a missing sheet.
Profile before arithmetic
Write brand, profile, BMT, coating, colour and cover width from the current sheet. Corrugate / Six Rib / Hi Five / T-Rib / tray are different covers and pitch rows — profile guide.
Sheet count = ceil(ridge-direction width including verges ÷ cover), per plane. Example: 7.200 m on 762 mm cover → 10 sheets per gable plane, not 9.45. Length = slope, rounded up 50 mm on this site.
Do not average two pitches. Do not convert total m² to sheets and stop.
Checks the merchant can argue with
- Cladding pitch vs the CoP / manufacturer row (8° corrugate, 4° Six Rib, 3° Hi Five/T-Rib). Design pitch on the truss is not the same number.
- Run length vs the “check capacity after …” figure (15 m corrugate, 20 m Six Rib, 40 m Hi Five).
- Flashings as measured lines: ridge, barge, hip, valley, apron, penetrations. Extra High → Category B covers.
- Waste from hips, valleys and steep cuts, not a default 10%.
- Truck and yard max cut. A 18 m theoretical sheet that will not load is not an order.
Stop and hand the pack to an LBP or designer if you cannot split the roof into planes, the product sheet is missing, or the junction is a consent-level gutter.
What to send
A screenshot of the takeoff plus the assumptions: measurement source, cover used, overhangs, excluded items (dormers, labour, freight). GST is a price line, not a sheet count.
Checklist: named planes; plan vs slope labelled; cover in mm; pitch and run checked; flashings listed; waste explained; current NZMRM Code of Practice and product sheet cited. Then open the takeoff and let the merchant disagree with the written numbers, not a round m².