FreeConstruction · Roofing

Roofing squares, bundles and underlayment

Roof area, squares, shingle bundles, nails and underlayment rolls from the footprint and pitch.

Free for the roofer role. No account needed.

Your numbers

Roof footprint (plan area) (sq ft)Area seen from above including overhangs.Roof pitch (in per 12)Rise per 12 in of run.Waste (%)Simple gables ~10%; hips and valleys 15% or more.Bundles per square3-tab and most architectural shingles are 3 bundles per square.UnderlaymentCoverage per roll after laps.

For the ice barrier and edges8 more, filled with typical values

Eaves (linear ft)Total length of all eave edges.Rakes (linear ft)Total length of all gable (rake) edges.Ridges and hips (linear ft)Total length to cap with ridge shingles.Valleys (linear ft)Total valley length.Ice barrierRequired where the local code table shows a history of ice dams; check with your building department.Eave overhang (in)Level distance from the fascia to the outside of the wall.Wall thickness (in)Outside of sheathing to the inside of the wall; about 6 in for a 2x6 wall.Tear-offOld layers to strip before the new roof.

Roofing squares, bundles and underlaymentForge by Norventus

How it works

Press Calculate to see the roof surface area, the squares with waste, the shingle bundles, the underlayment rolls and the nails.

Shingles on the roof and the bundles they come inHouse, deck, underlayment, rolls and nailsOffcuts the waste allowance pays forThe drawing follows your numbers as you type: a bigger house for a bigger footprint, a steeper roof for a higher pitch, a taller stack of bundles on the pallet for a bigger roof, each layer holding as many bundles as you set per square, a fatter roll for synthetic underlayment and more offcuts for more waste. Press Calculate for the roof area, the squares, the bundles, the rolls and the nails, worked out by the tool.

Result

Ready when you are.Enter your numbers and press Calculate.

References

Check the work against these

The edge take-off: ice barrier up the slope from overhang, wall and pitch, valley membrane, starter, drip edge, ridge cap and tear-off squares. Numbers in the result and in the plain-words read point here.

1
Ice barriers explained: how far up the roof slope?Guide
Fine Homebuilding
IRC R905.1.2: the ice barrier runs from the eave to at least 24 in inside the exterior wall line, measured level, so overhang and wall add to it. A 6/12 roof with a 12 in overhang and a 2x6 wall needs about 47 in up the slope.
2
UFGS 07 31 13, Asphalt ShinglesGuide
Whole Building Design Guide (US Department of Defense)
A full asphalt shingle spec: underlayment laps, eave leak barrier 24 in past the inside of the wall, drip edges, manufacturer's starter and ridge cap shingles (not cut from field shingles), and six nails a shingle in high-wind areas.
3
29 CFR 1926.501, Duty to have fall protectionCode
OSHA
Residential construction work 6 ft or more above a lower level needs guardrails, safety nets or personal fall arrest, and the rules for roofing on low-slope roofs.

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Roofing squares, bundles and underlayment

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