To flatten a warped piece of wood, you’ll need to change the moisture content on one side of the board. Look at your warped board and identify the inside face of the “C” or cup. The wood fibers on this side of your board are dryer and have shrunk. You can use water to relieve the tension and allow the board to flatten.

What is the best way to straighten warped wood?


  1. Wrap the wood in moistened towels. Moisten one or two large towels and wrap them around the wood, making sure that the entire warped area is covered. …
  2. Place the covered wood on an ironing board. …
  3. Heat an iron to its highest setting. …
  4. Press the iron over the warped surface. …
  5. Repeat as needed.

How long does it take to flatten warped wood?

This action ensures that your boards will dry flat, but it may take some time. Be prepared to wait for two days or even up to a week for your board to flatten out and naturally dry this way.

How do you flatten a warped wood table top?

Set up a heat lamp aimed directly at the wet towels and bow or allow the table to sit in sunlight. Wet the towels and tighten the clamps each day for anywhere from three or four days to a week or more depending on the severity of the bow. Leave the towels, battens and heat source in place until the warp straightens.

Does oiling wood prevent warping?

A penetrating oil like CUTEK® protects wood from the inside out. It works by penetrating deeply into the timber to repel moisture. It also helps to stabilise wood, preventing cupping, splitting and warping.

Why does my wood keep bowing?

Wood warps when the moisture content in the wood changes unevenly. Think of it this way: You have a 2×4 that gets wet. As it dries, one part of the board dries faster than the other, causing the drier area to shrink faster. That causes stress on the wood and can cause it to warp or bend.

Does wood warp over time?

Although most wood will age well over a long period of time in the right conditions, lots of wood pieces could be ruined if they become warped due to poor storage conditions with excessive humidity or moisture. In order to wood waste, you must know how to store lumber to prevent warping.

What does it mean when a board is bowed?

Warp is a bend or “cupping” of a board across the grain, not with the grain. Usually this means that a board will be warped across the width of the board, not its length. (When a board is bent or cupped with the grain it is known as “bow.”)