MetraNestMeasure one face of the wall
Measure the horizontal width, then the vertical height at each end. The top edge must connect these two points with a straight line. Do not measure the slope length in place of the width. The two heights may be equal, but they cannot both be zero.
Separate changes in slope
A zero height represents a triangular shape. A wall with a central peak, several slopes or a step needs several zones. Calculate each zone without overlap, then add the areas. This division must follow the actual outline, rather than only the largest dimensions of the wall.
Deduct openings and understand the limits
Add the areas of openings within this face and enter that total only once. The deduction covers neither window reveals nor a cutting plan. The net result describes an area; it does not guarantee that cut-outs will reduce the amount of material purchased.
Gross area = width × (left height + right height) ÷ 2. Net area = gross area − openings.
A 4 m wall under a uniform slope
For heights of 1 m and 2.5 m, the average height is 1.75 m. The 4 m wide wall has a gross area of 7 m². Deducting 1 m² of openings leaves a net area of 6 m².
Details to check
- Measure the heights vertically.
- Split an outline with several slopes into separate zones.
- Record openings and reveals separately.
Frequently asked questions
Can the height at one end be zero?
Yes, if the other height is positive. The calculation becomes that of a triangle: width × height ÷ 2.
Can I calculate a wall with two slopes?
Calculate the two parts separately, using the width and heights of each. A single average between the outer ends would miss the intermediate peak.
A method you can check · Content review :
Each tool shows its formulas and assumptions. Worked examples let you repeat the calculation and understand how rounding works.