 24 May 2021
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Plastering & Insulation Formulas
 Updated on 24 May 2021
 3 Minutes to read

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Before reading this article, please make sure you are familiar with Measurement  Parts & Labour in Groundplan.
Parts, labour and the formula used are unique to each project and company, the information below details the example of Plastering 2.4m ceilings being measured on a 2D plans and the formulas used to calculate additional parts and labour.
 The formula given is a guideline to be used to calculate your own measurement parts and labour.
 If there is more than one wall height on the project, each wall height will need to be a separate measurement and the parts & labour built into each measurement.
Plasterboard
When calculating plasterboard, there are a few common scenarios and formula that can be used:
1. Per Meter  If you charge out per Linear
meter measured.
Formula: len
Breakdown:
len
 the number of meters measured;
ceil(len)
 (optional) to show the meters measured by rounding up a decimal value to the next whole number.
2. 6m x 1.2m sheets required  calculate the number of 6m x 1.2m
sheets required, when the wall height is 2.4 meters
.
UOM: sheets
Formula: len * 2.4/ 7.2
Breakdown:
len
 the number of meters measured;
* 2.4
 multiplying by the wall height to turn meters into sqm;
/7.2
dividing by the area of a single sheet (6m*1.2m = 7.2m2);
ceil(xxx)
 (optional) to show the number of whole sheets by rounding up a decimal value to the next whole number.
3. Sheets required  calculate the number of sheets required for a 6m sheet length
, where 2 sheets
are required to cover the wall area when the height is 2.4 meters
.
UOM: sheets
Formula: len/6*2
Breakdown:
len
 the number of meters measured;
/6
 dividing the length measured by the sheet length;
* 2
multiplying by the number of sheets needed for the wall height;
ceil(xxx)
 (optional) to show the number of whole sheets by rounding up a decimal value to the next whole number.
Cornice
When calculating cornice, here are two common scenarios and formula that can be used:
1. Per Meter  to measure the meterage
of cornice required.
Formula: = len
Breakdown:
len
 the number of meters of measured;
ceil(len)
 (optional) to show the cornice measured by rounding up a decimal value to the next whole number.
 Cornice in 4.2m lengths  Calculating the cornice, when you purchase the cornice in
4.2m lengths
.
UOM: lengths
Formula: len/4.2
Breakdown:
len
 the number of meters measured;
/4.2
dividing by the length you purchase the cornice in;
ceil(xxx)
 (optional) to show the number of lengths by rounding up a decimal value to the next whole number.
Insulation / Pink Batts
To quantify the number of bags of 5.8m x 11.6m
insulation required.
UOM: bags
Formula: len * 2.4/ 67.28
Breakdown
len
 the number of meters measured;
* 2.4
 multiplying by the wall height to turn meters into sqm;
/67.28
dividing by the area of a roll of insulation(5.4m * 11.6m
= 67.28m2
);
ceil(len)
 (optional) to show the number of bags by rounding up a decimal value to the next whole number.
Total Wall Area
This part is used to quantify the sqm of walls that need to be plastered, commonly used where you have multiple measurements being used to quantify the same parts e.g. 2.4m walls and 2.8m walls
UOM: m2
Formula: len * 2.4
Breakdown:
len
 the number of meters measured;
* 2.4
 multiplying by the wall height to turn meters into sqm.
Door & window removal
If your calculations include door and window removal, these would be calculated using additional measurements.
Please see the following article on Door and window removal for formula examples.
The Final Measurement
For additional formula assistance, please see our Measurement Parts & Labour FAQs or click on help and click send us a message to contact one of our team.