Calculating the correct quantity of EPS Cement Sandwich Wall Panel for your project is very simple, and it will help you avoid over-ordering waste or under-ordering delays. First, measure the total length and total height of all the walls you plan to cover with EPS Cement Sandwich Wall Panel, then multiply them to get the total gross wall area in square meters.

Second, subtract the area of all doors, windows, and large openings from this gross wall area. A standard 90cm x 200cm door takes up 1.8 square meters, and a standard 120cm x 120cm window takes up 1.44 square meters. After subtracting all openings, you get the net actual wall area that needs to be covered by EPS Cement Sandwich Wall Panel.

Third, add a 3-5% extra margin to this net area. This extra 3-5% of EPS Cement Sandwich Wall Panel will cover all cutting waste, small expansion gaps, and accidental panel damage during installation. For a 100 square meter wall project, you only need to order 103-105 square meters of EPS Cement Sandwich Wall Panel, which is far more accurate than ordering a rough estimate.

Finally, if you have many small irregular openings or complex wall shapes, increase the extra margin to 7%. This small extra amount of EPS Cement Sandwich Wall Panel will prevent you from running out of panels halfway through installation, which can cause costly construction delays.