New Zealand · Dimond

Dimond Six Rib calculator

760 mm cover, 4° cladding pitch, drainage check after 20 m.

Job name

Profile Dimond Six Rib

NZS 3604 wind zone Override cover (mm) Sheet length cap (m) Waste override (%)

Low trapezoidal. Suitable for many 4–8° roofs where corrugate would fail min pitch.

Section name

Form Plan length (m along ridge) Plan width of plane (m) Pitch (degrees) Eave overhang (m) Barge / verge overhang (m) Valley count

Supplier pricebook (optional)

Sheet $/lm Ridge $/lm Barge $/lm Valley $/lm Underlay $/m²

Your rates, GST exclusive. Totals add 15% GST. Hip flashing uses the ridge rate.

Takeoff

Check before order

Sloped area: 77.63 m²
Sheets: 16 @ 6.45 m
Cover: 760 mm · 4°
Waste: 5% → 81.51 m²
Ridge / hip: 0.00 / 0.00 lm
Barge / valley: 12.83 / 0.00 lm
Flashing cover: Cat A · ridge 130 mm · barge 75 mm

Dimond Six Rib sheetsCover 760 mm · length 6.45 m (rounded up 50 mm from 6.416 m) 16 sheets
Sheet lineal metres 102.66 lm
Underlay (10% lap allowance) 85.40 m²
Barge flashing (75 mm profiled cover)1 upstand may suffice on trapezoidal Cat A — confirm detail 12.85 lm
Apron / head flashing (skillion high side) 12.10 lm

Pitch is at or near the minimum

Low-pitch roofs need more flashing cover, more care at side laps, and a drainage check. Confirm as-laid pitch after deflection.

Cladding pitch is not design pitch

NZMRM CoP 7.1.1A: tabulated minimums are roof cladding pitch, not the building-design roof pitch. Wide purlin or portal spacing can leave the as-laid pitch below the table even when the drawings say otherwise.

This is a takeoff, not a quote

Numbers assume rectangular planes, constant pitch, sheets laid ridge-to-eave, and published nominal cover widths. Hips, valleys, penetrations, stop-ends, and end laps change the order. Confirm on the current product sheet and the latest CoP at metalroofing.org.nz.

Spec this page uses

Cover: 760 mm
Overall sheet width: 820 mm
Rib height: 20 mm
Min cladding pitch: 4°
Check run: 20 m
Source: Dimond Six Rib product data; CoP trapezoidal asymmetrical 20 mm → 4° / 20 m

FAQ

When is Six Rib the step down from corrugate?

From 4° up to 8°, where 16.5 mm corrugate fails the 8° table. Check drainage after 20 m of run.

What are the Six Rib widths?

760 mm cover, 820 mm overall, about 20 mm rib. Count from 760 mm.

Dimond Six Rib calculator

Spec this page uses

FAQ

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