Question 1

How do you measure roof area from plans?

Accepted Answer

Set the scale on the roof plan, then trace each plane with the area tool and apply your pitch or slope factor, since the flat plan area understates the true roof area. Allow for the eaves overhang too. MetreMate totals the plane areas so you quote per square metre without a scale ruler.

Question 2

How many roof sheets do I need from plans?

Accepted Answer

Measure the sheet length from ridge to fascia along the slope, then count the sheets across each plane with the count tool. MetreMate keeps a live total, so you order the right number of sheets and lengths.

Question 3

How do you measure ridge, hip and valley from a plan?

Accepted Answer

Measure each run in lineal metres with the measure tool. MetreMate totals ridge, hip, valley, barge and gutter separately, so your flashing and capping quantities come straight off the plan.

Question 4

How do I apply a pitch factor to a roof plan area?

Accepted Answer

The plan shows the flat footprint, so multiply the plane area by a pitch factor to get the true sloped area, about 1.035 at 15 degrees, 1.082 at 22.5 degrees and 1.103 at 25 degrees. MetreMate gives you the flat plane area off the plan, then you apply the factor for the pitch noted on the section.

Question 5

How do I work out roof sheet lengths from a plan?

Accepted Answer

Measure each plane from ridge to gutter and add the eaves overhang to get the sheet length in lineal metres. On a roof plan that distance is the flat run, so multiply it by the pitch factor, or measure the true slope on a section. Then round each sheet up to your available lengths and count the sheets across the plane width.

Question 6

How do I estimate gutter and downpipe quantities from a plan?

Accepted Answer

Measure the eaves runs in lineal metres with the measure tool for gutter, then count the downpipe positions with the count tool. MetreMate totals the runs and counts, so your gutter, downpipe and bracket order matches the roof you have measured.

Roof area, sheets and flashings from the plan

The slow way, or the smart way

Everything you can measure off the plan

Lengths & lineal metres

Areas in m²

Perimeters

Counts

How roofing suppliers use MetreMate

Roof plane areas

Sheets and lengths

Ridge, hip and gutter

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