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What are the prospects for doing a soft wash with a pressure washer? My biggest concern is that they're likely quite dirty so you'd run into adhesion problems. And what does the fire retardant paint say about priming?
 

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Discussion Starter · #3 ·
Pressure washing is probably a good idea. Not sure about priming. I'm researching fire retardant paint and not sure about priming first. Have to get more info on that. Thanks for the feedback.

What are the prospects for doing a soft wash with a pressure washer? My biggest concern is that they're likely quite dirty so you'd run into adhesion problems. And what does the fire retardant paint say about priming?
 

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I wouldn’t sand unless there are textural concerns. I’d wash with a TSP substitute and also use the appropriate cleaner to address white mold, if any, followed by priming with a stain blocking primer, preferably oil based, to reduce the potential for tannin bleed being that the joists look like DF, followed by a water based intumescent coating(s) applied to mil spec
 
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