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mold on outdoor cedar ceiling w polyurethane coating

7 years ago

Hello to all,

In Houston, we have high humidity. The ceiling in question is outdoors and has, for the second time, mold on the cedar T&G boards that have 4-5 coats of urethane. I used some 409 w a soft/foam sponge mop to clean them the first time.

Based on the pic's below, does anyone have a suggestion on:

1. Best thing to use to kill/remove mold that will no harm finish?

2. Anything I can apply proactively that will prevent mold and not hurt finish or leave "water stains" film or the like? Note, the mold has not penetrated the urethane to the wood; it's just on the urethane/coating surface if you have any questions, pls let me know.




Thank you very much, tstex

Comments (6)

  • 7 years ago

    I think what you are doing is good as any. Only thing I can think of doing proactively is using the same mop to wipe ceiling occasionally with weak solution of bleach water and alow to air dry. Wiping remove's dirt necessary for mold growth and the tiny amount of bleach left behind make's the surface inhospitable for mold. Doing this when ceiling is already damp from condensation make's job go faster.

  • 7 years ago

    Thank you klem, appreciate your follow-up. I used a comb of 409 and mold & mildew killer w bleach. After cleaning, I had to go back w a diff lightly dampened sponge mop and wipe off the residual. I still could not get into the individual grooves which still has some mold in them, but 99% of the planks have all been thoroughly cleaned. It took me 4-5 hrs of tough angle cleaning. I am going to have to find a better way to do this or more importantly, prevent it ??


    Thanks for everyone's suggestions and help - tstex

  • 7 years ago

    Call or email the support line of clear coat manufactures to ask if (A) any of their products contain mildew inhabitor and (B) if such additives can be added to clear coat before application. Paints containing mildewcides are available from most all brands but I'm not sure about clears.

  • 7 years ago

    will do -thanks klem - ill post back what I find

  • 7 years ago

    Excellent. Meanwhile,can you folks around Houston help us North Texans settle a debate over "Row vs Wade"? We had 12" of rain in Sept which is 10" above average and so far Oct is looking like it might be even wetter.

  • 7 years ago

    Really glad to hear of the excessivie rains to recharge the aquifers, fill the lakes and reserviors, rejuvinate the wildlife, provide good deep soil moisture and settles the dust and elimiates the fear of extended drought time. Droughts are really stressful and usually always prolonged over the anticipated recovery time. Re R vs W, I am told not to take another life...it's pretty clear to me.