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Black Wood Rot

Black Wood Rot

Black Wood Rot

(OP)
  Anyone ever seen or know about a wood rot that looks identical to tar?

RE: Black Wood Rot

What is the species?  Could be 'brown' rot, which attacks the cellulose fibres, leaving the lignin.

RE: Black Wood Rot

(OP)
  The species is syp or hem fir etc: construction lumber. I belive the black growth is another mold in addition to the brown or white rot. Seems to be a host of mildews which will grow on the surface of moist wood in addition to the ones that cause decay.

RE: Black Wood Rot

The black mildew is more of a health hazard than a hazard to the wood.  It should be killed off using a bleach-detergent solution (don't use a detergent with ammonia - generates toxic fumes).  This will kill the mildew and the surface should be cleaned and painted with a primer and top coat containing a mildewcide.  In areas with extreme mildew problems (warm and humid) the primer should contain a zinc oxide for longer lasting effect.

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