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# How to calculate gypsum design false ceilings?

## How to calculate gypsum design false ceilings?

In this post you will learn how to calculate a gypsum design false ceiling as per the design you see in the image above. Let's say the room dimensions about 15' length and 10' breadth and having a first layer of plain false ceiling and 1.5' bottom breadth of second level cove design layer on throughout the walls with 4" drop from the first layer and a couple of rafters on the first layer having 2 wings with dimensions of 0'-2" x 0'-6" x 0'-2" x 4' (Left x Bottom x Right x Length).

Before we get in to the calculation process we should know some basic things about the false ceiling calculation method. This is not only applicable for gypsum plasterboard false ceilings; this method should be applied on any kind of multi-layer false ceilings.

### Calculation Rules

- Less than 1' breadth of surfaces must be taken in running feet instead of square foot.
- Each and every side of the surfaces should be treated as an individual object (i.e. every surfaces of a rafter).
- Cut opens for light fixtures, A/C grills, diffusers, trap doors or for any other things should not be considered for deduction.
- Only exposed surfaces should be measured (i.e. the 1
^{st}layer should measure from inner vertical to vertical, not from wall to wall).

### Calculation Process

**1**Measure the length and breadth from inner vertical to inner vertical and multiply them (i.e. 13 x 8 = 104 sq.ft).^{st}layer ceiling:**2**Measure the total perimeter of wall (15' + 10' + 15' + 10' = 50') and subtract the overlaps of each corners (i.e. 4 no's x 1.5' = 6') and multiply the final value (50' - 6' = 44') with the bottom breadth of second layer (i.e. 44' x 1.5' = 66 sq.ft).^{nd}layer cove bottom:**2**Measure total length of inner (13' + 8' + 13' + 8' = 42') and outer vertical (12' + 7' + 12' + 7' = 38') separately and add them both (i.e. 42' + 38' = 80 ft).^{nd}layer cove verticals:**Surfaces of the rafters:**Measure the total perimeter of a rafter with both wings, as well as the bottom length (i.e. Side (4' + 4' + 6" + 3.5' + 3.5' + 6" = 16') + Bottom (4' + 3.5' = 7.5') = 23.5') and then multiply by the total number of rafters (i.e. 23.5' x 2 = 47 ft).

### Final Calculation Value

- Total square foot: A + B = 170
- Total running feet: C + D = 127