- 20 Sep 2023
- 4 Minutes to read

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# Construction Formula

- Updated on 20 Sep 2023
- 4 Minutes to read

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- PDF

Before reading this article, ensure you have read Measurement - Parts & Labour and Using Formula within Groundplan articles to aid in understanding the following Formula examples.

📝 The Formula values provided in this article are for example purposes only.

Term | Explained |
---|---|

`count` | total counts |

`len` | total metres measured |

`area` | total square metres measured |

`count, len or area / x` | total count/length/area divided by an `amount` |

`count, len or area * x` | total count/length/area multiplied by an `amount` |

`+ len * x` | add the perimetre of the area drawn multiplied by an `amount` |

`ceil(x)` | rounding up a decimal value to the next whole number |

## Internal Door

Measurement Part Formula examples to calculate a 2040mm x 820mm x 35mm internal door using a Count Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Internal Door 2040mm x 820mm x 35mm | counted`Doors` | `count` | each |

Gainsborough G3 series satin chrome | required`Handles` | `count` | each |

Hinges | of hinges required for `Number` per door`3 hinges` | `count*3` | each |

Rebated door jamb (5.4m length) | Number of required for each door`5.4 lengths` | `count` | lengths |

Bevelled edge architrave 42mm x 11mm (5.4m length) | Number of required for `5.4 lengths` `each side of the door` | `count*2` | lengths |

## Framing

Example Parts for frame including bottom, top and ribbon plates, noggins and studs @450mm spacing (2.4m lengths) Length Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

MGP 10 Framing pine H2 90mm x 35mm (2.4m lengths) | The total length measured divided by multipled by `lengths of 2.4m` for bottom plate, noggins, top and ribbon plates, added to the total length measured divided by `*4` `studs every 450mm` | `(len/2.4*4) + (len/0.45)` | lengths |

## Cladding

Example Parts for Primeline Newport 4200mm x 170mm x 9mm Area Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Primeline Newport 4200mm x 170mm x 9mm (0.588m2 coverage) | Total area measured after doors and windows were removed divided by `0.588m2 of board coverage` | `ceil(area/0.588)` | boards |

## Brickwork

Example Parts for standard brickwork Area Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Brickwork Standard | of brickwork required after windows and doors were removed`Area` | `area` | m2 |

Bricks | How many are required after windows and doors were removed when `bricks` fit into an average m2 and allow for `50 bricks` `10% wastage` | `ceil(area*50*1.10)` | each |

## Concrete

Example Parts for a 150mm thickness concrete Area Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Concrete 150mm | How much m3 of concrete is required for `150mm thickness` | `area*0.15` | m3 |

Formwork | How many metres of formwork is required for the measured`perimeter around the area` | `len` | m |

Steel mesh 4.56m x 1.97m (7.5m2 coverage) | How many sheets are required for the area measured`7.5m2 coverage` | `ceil(area/7.5)` | sheets |

Bar chairs (pk500) | How many chairs are required to support the steel mesh with and come in a `4 per m2` `bag of 500` | `ceil(area*4/500)` | bags |

## Strip Footings

Example Parts for a strip footings Length Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Trench | How many cubic metres required for the total length measured multiplied by multiplied by `450mm width` and allow for `450mm depth` `10% expansion` | `(len*0.45*0.45)*1.10` | m3 |

Concrete | How many cubic metres required for the total length measured multiplied by multiplied by `450mm width` and allow for `450mm depth` `10% expansion` | `(len*0.45*0.45)*1.10` | m3 |

## Decking

Example Parts for a Kwila Decking 90mm x 19mm (including 5mm gaps) Area Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Kwila Decking 90mm x 19mm | How many of decking boards are required when `metres` covers 1 m2 with 5mm gaps and allow for `10.52m` `10% wastage` | `(area*10.52m)*1.10` | m |

## Waterproofing

Example Parts for a waterproofing Area Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Wet Areas | Total measured`area` | `area` | m2 |

Primer | How many are required for the area measured plus `Litres` up the wall around the perimetre of the area divided by an average of `100mm` `1 litre based on covering 6m2` | `(area+len*0.1)/6` | Litres |

WP Membrane | How many are required for the area measured plus `Litres` up the wall around the perimetre of the area divided by an average of `100mm` multiplied by `1 litre based on covering 1.5m2` `2 coats` | `(area+len*0.1)/1.5*2` | Litres |

## Tiling

- Example Parts for Limestone porcelain 600mm x 600mm floor tiles Area Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Limestone porcelain 600mm x 600mm floor tiles | of tiles required after cabinets and islands benches were removed`Area` | `area` | m2 |

Limestone porcelain boxes | How many are required when a box covers `boxes` and allowing for `1.44m2` `20% wastage` | `ceil(area/1.44*1.20)` | boxes |

- Example Parts for subway grey 200mm x 100mm wall tiles Length Measurement:

Part | Explanation | Formula | UMO |
---|---|---|---|

Subway grey wall tiles 100 x 200mm | How many m2 of tiles are required when the tiles are up the wall`600mm` | `len*0.60` | m2 |

Subway grey boxes | How many are required for the total length multiplied by `boxes` up the wall when a box covers `600mm` and allowing for `1.14m2` `10% wastage` | `ceil((len*0.6/1.14)*1.10)` | boxes |

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