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Brand New Unstained Deck's Black Spots

Posted by mnwildrose (My Page) on
Mon, Sep 2, 13 at 16:00

Our new (unstained) cedar deck has been in for 9 days now and it's already got several black spots (see close-up). These black marks shouldn't have appeared so fast, should they? It looks awful!

What is this? Please, we need ideas on what to do. Is this the contractor's fault; something wrong with the cedar? We had planned to let the deck age for a couple of months, so that it will accept stain well, and then stain it.

Thanks in advance for any help you can share!

Follow-Up Postings:

RE: Brand New Unstained Deck's Black Spots

Just thought I would add this second photo that's not as close - lots of small black spots and then the big smudges of black around the screws.
I sure am hoping that someone can help us!

RE: Brand New Unstained Deck's Black Spots

Looks to me like the fasteners are rusting.

RE: Brand New Unstained Deck's Black Spots

Did you ever get the spots to go away? We have the same issue with out unstained treated deck. We were hoping to stain it this fall but cannot get rid of the spots. Deck cleaner does nothing. I've even made my own cleaner and increased the bleach in the mix to no avail.

RE: Brand New Unstained Deck's Black Spots

It's been odd. The black marks seem to come and go - never totally away, but they lessen, sometimes to almost nothing, and then come back. I am glad to say, there's less blackening now than there was soon after the deck was built - when the photos were taken.

We didn't do anything to the deck this fall. Cold weather hit before we felt we should stain. So, hoping that this coming spring we'll be able to go through the steps of cleaning and preparing the deck for a good staining.

Sure would appreciate you writing back as you figure out what's best to do with your deck. Thanks for writing!

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