Determining Quantities 

How Much Product Will I Need   Having decided to incorporate TIMBECK products into the project, the time soon comes when it is necessary to determine how much material is needed to meet the job requirements. This is particularly relevant for external claddings and internal panellings.   To provide examples of the calculation process, we will assume that the area of wall to be covered measures 5385 mm long by 2395 mm high.   The product we have chosen is WCSA12718 which has a cover of 127 mm.

 

Vertical Application  -  Single Length Boards   To adequately cover the length of the wall, we need to determine the number of boards which when fixed vertically side by side will measure 5385 mm.   The calculation is simply 5385 (the length of the wall) divided by 127 (the cover of the board) 5385 ÷ 127 = 42.4 – rounded up to even numbers = 43 boards.

 

The next standard length greater than our required 2395 mm is 2.4 metres – so the order for the material required to cover the wall would be 43 pieces each 2.4 metres long (a total of 103.2 lineal metres).   Depending on other aspects which might influence whether the installation needs to start with full or partial width boards, an extra piece or two may be required. In addition, finishing trims may be required and these are determined by simple linear requirements.

vertical applications boards = wall length ÷ cover

 

Horizontal Application  -  Single Length Boards For most horizontal applications where the length of the wall does not exceed 6000 mm, single lengths can be supplied. However, quantities of one long length can attract some significant price premiums (and sometimes supply constraints) and these aspects need considering before making a final decision – find more on pricing aspects in the adjoining tab - Relative Costs.

 

Assuming we have decided to proceed with single lengths, the process to determine the quantities required is virtually the same as for Vertical Application.   To adequately cover the height of the wall, we need to determine the number of boards which when fixed horizontally one above the other will measure 2395 mm. The calculation is simply 2395 (the height of the wall) divided by 127 (the cover of the board)  -  2395 ÷ 127 = 18.9 – rounded up to even numbers = 19 boards.

horizontal applications boards = wall height ÷ cover

 

The next standard length greater than our required 5385 mm is 5.4 metres – so the order for the material required to cover the wall would be 19 pieces each 5.4 metres long (a total of 102.6 lineal metres – almost identical to the vertical application).

 

Horizontal Applications  -  Random Length Boards For any Horizontal Application over 6000 mm in length, boards are not available in single lengths and therefore two or more must be joined end to end – this is carried out over the face of a supporting framing stud. In most cases, having all the joins in a single line (unless it is a specific architectural detail featuring the join) does not present a satisfactory appearance and ‘random’ joins are much preferred. In these cases, determining multiple numbers of specific lengths which will achieve the random arrangement is extremely difficult to address and accordingly, a different approach to arriving at the required quantities is adopted.

 

We calculate the area of the wall surface to be covered (in square metres), divide it by the cover of the board (in metres) and add a ‘waste’ allowance. The base calculation is 5.385 x 2.395 ÷ 0.127 = 101.6 plus the waste allowance.   The waste allowance will vary depending on the spacing of the supporting stud framing – the wider the spacing, the higher the waste allowance. For 450mm stud centres, an additional 10% should suffice while for 600mm, that may increase to 15%.

random horizontal applications quantity = wall area ÷ cover

 

If we assume 600mm stud spacing and add the 15% waste allowance, our order quantity becomes 117 lineal metres (this compares with the 103.2 and 102.6 set length quantities in the other examples above).   However, while we may be needing to order an additional 10% to 15% of material, the base price of the random order may well be more than 15% lower than that for the quantity of long set lengths.

 

Diagonal Applications  -  Single Length Boards For single length applications, follow the same general procedures set out for Vertical Applications but adjust the length of boards to suit the diagonal measurement – eg for 45°, increase the height dimension of the wall by 50% - 2400 x 1.5 = 3600mm board length.   With diagonal applications, it is also important to ensure that all off-cuts are used in a reciprocal location wherever possible.   Diagonal Applications  -  Random Length Boards Follow the same general procedures set out for ‘Horizontal – Random’. Calculate the area of the wall surface to be covered (in square metres), divide it by the cover of the board (in metres) and add the ‘waste’ allowance. Ensure that all off-cuts are used in a reciprocal location wherever possible.     In all cases, the information presented here is intended to provide a guide to the procedures necessary to arrive at appropriate order quantities.   The matching of theoretical take-offs with actual installation practices is not a precise science, and small discrepencies in over-supply or under-supply could be encountered.