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    Construction Formula
    • 20 Sep 2023
    • 4 Minutes to read
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    Contents

    Construction Formula

    • Updated on 20 Sep 2023
    • 4 Minutes to read
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    Article summary

    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.

    TermExplained
    counttotal counts
    lentotal metres measured
    areatotal square metres measured
    count, len or area / xtotal count/length/area divided by an amount
    count, len or area * xtotal count/length/area multiplied by an amount
    + len * xadd 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:

    carpentry-door.png

    PartExplanationFormulaUMO
    Internal Door 2040mm x 820mm x 35mmDoors countedcounteach
    Gainsborough G3 series satin chromeHandles requiredcounteach
    HingesNumber of hinges required for 3 hinges per doorcount*3each
    Rebated door jamb (5.4m length)Number of 5.4 lengths required for each doorcountlengths
    Bevelled edge architrave 42mm x 11mm (5.4m length)Number of 5.4 lengths required for each side of the doorcount*2lengths


    Framing

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

    construction-framing.png

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


    Cladding

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

    construction-cladding.png

    PartExplanationFormulaUMO
    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 coverageceil(area/0.588)boards


    Brickwork

    Example Parts for standard brickwork Area Measurement:

    construction-brickwork-area.png

    PartExplanationFormulaUMO
    Brickwork StandardArea of brickwork required after windows and doors were removedaream2
    BricksHow many bricks are required after windows and doors were removed when 50 bricks fit into an average m2 and allow for 10% wastageceil(area*50*1.10)each


    Concrete

    Example Parts for a 150mm thickness concrete Area Measurement:

    landscaping-concreting.png

    PartExplanationFormulaUMO
    Concrete 150mmHow much m3 of concrete is required for 150mm thicknessarea*0.15m3
    FormworkHow many metres of formwork is required for the perimeter around the area measuredlenm
    Steel mesh 4.56m x 1.97m (7.5m2 coverage)How many 7.5m2 coverage sheets are required for the area measuredceil(area/7.5)sheets
    Bar chairs (pk500)How many chairs are required to support the steel mesh with 4 per m2 and come in a bag of 500ceil(area*4/500)bags


    Strip Footings

    Example Parts for a strip footings Length Measurement:

    construction-strip-footings.png

    PartExplanationFormulaUMO
    TrenchHow many cubic metres required for the total length measured multiplied by 450mm width multiplied by 450mm depth and allow for 10% expansion(len*0.45*0.45)*1.10m3
    ConcreteHow many cubic metres required for the total length measured multiplied by 450mm width multiplied by 450mm depth and allow for 10% expansion(len*0.45*0.45)*1.10m3


    Decking

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

    construction-decking.png

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


    Waterproofing

    Example Parts for a waterproofing Area Measurement:

    construction-waterproofing.png

    PartExplanationFormulaUMO
    Wet AreasTotal area measuredaream2
    PrimerHow many Litres are required for the area measured plus 100mm up the wall around the perimetre of the area divided by an average of 1 litre based on covering 6m2(area+len*0.1)/6Litres
    WP MembraneHow many Litres are required for the area measured plus 100mm up the wall around the perimetre of the area divided by an average of 1 litre based on covering 1.5m2 multiplied by 2 coats(area+len*0.1)/1.5*2Litres


    Tiling

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

    construction-tiling.png

    PartExplanationFormulaUMO
    Limestone porcelain 600mm x 600mm floor tilesArea of tiles required after cabinets and islands benches were removedaream2
    Limestone porcelain boxesHow many boxes are required when a box covers 1.44m2 and allowing for 20% wastageceil(area/1.44*1.20)boxes


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

    construction-tiling-wall.png

    PartExplanationFormulaUMO
    Subway grey wall tiles 100 x 200mmHow many m2 of tiles are required when the tiles are 600mm up the walllen*0.60m2
    Subway grey boxesHow many boxes are required for the total length multiplied by 600mm up the wall when a box covers 1.14m2 and allowing for 10% wastageceil((len*0.6/1.14)*1.10)boxes


    For Formula assistance, please reach out to Support for assistance. Go to: Help > Send us a Message.

    Download a PDF copy of Using Formulas within Groundplan here.


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    Attachments
    Labour Conversion Chart 2023.pdf
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