To cover and protect the outside face of your bridge beams, we use Perma-Trim. Perma-Trim is perhaps the best house trim product available, but is ideal for use with our bridges. Perma-Trim is waterproof, and has no knots or finger joints. It requires no painting, although it can be painted if you wish. The color carries all the way through, which will hide any scratches. It will not swell, cup, split or rot. As an added bonus, Perma-trim is flame retardant, and is made from recycled vinyl, so it is environmentally friendly, and will last a lifetime. Thickness: ¾”Color: White only, but can be painted