mildewed deck


  #1  
Old 04-27-19, 07:07 AM
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mildewed deck

I built a deck 3-4 yrs ago out of PT pine, stained with CWF after the wood dried for about 4-5 months. The deck is in the sun all morning. Last yr it turned black with mildew so I cleaned it with bleach and restained it adding M-1 mildewcide to the stain. Over the winter the deck turned black so I cleaned it last week and now it's on it's way to turning black again. Any ideas as to why and how to prevent/slow down the mildew? I've cleaned/stained many decks over the years but never had this issue. Even decks further south with dew that didn't burn off until midday weren't this bad.
 
  #2  
Old 04-27-19, 07:44 AM
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Read this review... seems they have changed the formulation, and that mold it a reported issue with it.

https://www.deckstainhelp.com/flood-...-stain-review/
 
  #3  
Old 04-27-19, 09:05 AM
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It's probably been 25 yrs since I've used the oil base version of CWF and I've not seen it being sold locally in 15-20 yrs. I used the waterborne version - https://www.flood.com/products/wood-...-finish/cwf-uv
 
  #4  
Old 04-28-19, 05:59 AM
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Built my garage 30 years ago and last year is the first time I've had mildew on the north side.

Gotta be the weather.
 
  #5  
Old 04-28-19, 06:13 AM
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It has been an awfully wet winter/spring and last year was the 4th wettest year on record. I've just never seen mildew come back so fast especially on wood that sees a fair amount of sun.
 
 

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