Wood pergolas are beautiful, yet it doesn’t mean that it’s the best material. For a small garden, it may work well. However, when you plan to construct a pergola for commercial and large-scale projects, wood pergolas has some of its flaws too. For one, most woods are volatile. This is risky especially when it’s surrounded by structures or applications that are prone to fire. Wood requires painting to protect it from elements and most types of woods are inclined to moisture, insects and other pests like ants, bees and termites. You may need expensive repairs for it in the long run as wood can crack, swell and swerve after long exposure to the elements. In return, repainting may be needed every few years.