8. Calculating Hardwood Wastage
When purchasing hardwood due to it coming in random widths and length, it’s essential to account for wastage to ensure you have enough material for your project. Here’s how to calculate it:
Standard Wastage Percentage: A general rule of thumb is to add 10-20% to your total material needs if your buying PAR machined timber. For example, if your project requires 100 board feet of hardwood, purchase between 110 and 120 board feet. This will allow for you to work around any natural defects and essential if you are trimming on site to fit windowsill, treads and shelves.
Complex Projects: For intricate or large-scale projects, consider a higher wastage percentage, such as 20-30%, to ensure you have enough material.
Rough Sawn Purchases: the industry standard for most rough sawn timbers is 30% wastage which will allow the extra for length and width to achieve your final dimensions after machining. Sometimes even more for example if your after American walnut with little to no sap you may need to account for 50% wastage.
Measure Twice, Cut Once: Accurate measurements and careful planning can significantly reduce wastage.