To ensure wood dries straight, without warping follow these steps.
What you need
- Wooden spacers of equal height with a minimum size of 5 cm (2 inches), approximately 1 for every 2 metres of plank with a minimum of 1 for each end. The spacers need to be the same width as the planks, or wider.
- Household paint - it could be from a left over tin - and paint brush.
- Storage space that will protect the wood from the sun and rain, and large enough to allow air to circulate.
Method
Drying wood properly is crucial to prevent warping. Here's a general guide:
- Air Drying: This is the simplest method. Stack the wood with spacers between each board to allow air circulation. Place the stack in a dry, well-ventilated area, protected from direct sunlight and rain. If you don't have a suitable building then cover the stack with tarpaulin to shield it from the elements while still allowing air circulation.
- Use Spacers: Place thin strips of wood (spacers) between each layer of stacked wood to ensure even drying and prevent sticking.
- Weighting: You can place weights on top of the stack to help prevent warping. This is especially useful if you notice any boards starting to bend during the drying process.
- Monitor Moisture Content: Invest in a moisture meter to regularly check the moisture content of the wood. Aim for 9% for wood to be used domestically or up to 25% for wood to be used in construction eg wainy edge cladding.
- Slow and Steady: Allow the wood to dry gradually. Rapid drying can lead to stress and warping. A slower drying process is generally better for preventing warping.
- Controlled Environment: If you have access to a kiln, you can use it to control the drying environment more precisely.
- Seal the Ends: Applying a sealant such as paint or wax to the ends of the wood helps to slow down moisture loss from the ends, which can help prevent uneven drying and subsequent warping.
Remember that different types of wood may require slightly different drying techniques, so it's always a good idea to research the specific requirements for the type of wood you're working with.
Leave for a minimum of one year and then test periodically for moisture content until it reaches 9%.