What is a significant drawback of wood shingles without treatment?

Wood shingles without treatment have a significant drawback in terms of low fire resistance. Untreated wood is highly combustible and can easily ignite when exposed to flames or extreme heat. This characteristic poses a serious safety risk, especially in areas prone to wildfires or where buildings are closely spaced.

While some materials may offer high costs or excessive weight, they do not inherently affect the fire safety of the structure. Weather instability typically refers to issues like warp or rot, which can occur with prolonged exposure to water or extreme weather conditions, but these are separate concerns compared to the immediate danger posed by fire. Properly treating wood shingles with fire-retardant chemicals or using alternative roofing materials can significantly enhance fire safety, making it a crucial factor for homeowners and builders to consider.