Skip to main content
EERE » BTO » Building America » Solution Center Home » Image Gallery » The board in the center of this photograph shows blue stain (not lumber mold), a discoloration of the wood caused by a fungus affecting the living tree, which did not harm the structural integrity of the wood.

The board in the center of this photograph shows blue stain (not lumber mold), a discoloration of the wood caused by a fungus affecting the living tree, which did not harm the structural integrity of the wood.