Wood shakes were a common roof material for years. Many homeowners still love their appearance, but wood has a lot of downfalls as a roofing material. It's susceptible to moss and algae growth, and it is certainly not fire-resistant. Luckily, you can now achieve the appearance of a wood roof without these drawbacks. Synthetic roof tiles, which are made to look like wood, are becoming more popular. They are generally made from a vinyl-like material that is injected into a mold shaped and textured like a wood shake.