please help me with nail problem with garapa deck!

philim01September 23, 2009

We have a decking company building a garapa deck for us. They've been working on it on/off for a month and we have had various problems with them. I am now noticing that where many of the nails are in the garapa floor boards, there is a bluish-black discoloration of the deck boards. The owner said that this is because the boards have not been sealed yet and that this will come off when I get it washed prior to sealing. My question is, why is it doing this to begin with? Don't a lot of people not seal their garapa decks? We are planning on sealing ours, but does everyone who doesn't seal get this discoloration? Or does it have to do with the kind of nail it corroding? I tried to search to find out if there is a certain kind of nail that is supposed to be used. A man at Home Depot said something about ACQ nails being code. I am very ignorant about construction, etc and just want to know what I am talking about when I talk to the decking company about this again. Thanks you in advance for any information....

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Sounds like they're not using the right nails. To avoid corrosion in your ACQ (pressure treated) framing, you need to use hot-dipped galvanized nails specifially approved for ACQ wood or else stainless steel. The garapa doesn't need this, but the nails are going through the garapa into the ACQ, so you do. Can you find the box of nails they're using and take a photo? While you're at it, take a photo of the discoloration and post it as well.

The pros can better speak as to whether HDG nails have a negative reaction with garapa.

BTW, typical (and better) installation of the decking is with screws, preferably stainless steel. They'll hold it better than nails.

    Bookmark   September 23, 2009 at 12:34PM
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Weedyacres, this just shows how ignorant I am. Turns out these ARE screws, although not stainless steel. I just asked one of the guys working on the deck. There are no more screw boxes around. Here are some pics:

    Bookmark   September 23, 2009 at 2:21PM
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Also, just want to add that what the deck building company owner told me is that there this always happens and the only way to fix it is to sand the garapa when they are done prior to sealing. He may very well be right but based on my history with them I just to verify that this is correct and that is not because of the kind of screws they used. I also want to make sure that once I do seal the garapa, this isn't going to continue to cause problems for us.

    Bookmark   September 23, 2009 at 2:34PM
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Ok. One of the wokers just came and told me that he was wrong-the screws ARE stainless steel. He even showed me the box. So, I guess the stains are just inevitable and something to treat?

    Bookmark   September 23, 2009 at 3:56PM
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I'm going to have to defer to the pros on this. I didn't have anything like that with my SS screws in my garapa. Here's one of your pics so they don't have to copy/paste your link above:

    Bookmark   September 23, 2009 at 4:07PM
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Glav reaction to Garapa. SS will never do that. It looks like some of the screws lost the glav coating during install. Thats pretty common none of the glav screws now a days use the hot dip process. Just have the dude back one out and put a magnet to it if it sticks its not SS.

Always use SS fasteners with S American lumber. J.

    Bookmark   September 23, 2009 at 10:09PM
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That doesn't look like a stainless steel screw to me. My guess is that they started with galvanized screws and when you said something, they switched to stainless hoping to mitigate the problem. As John suggested, back one out and see if a magnet sticks.

    Bookmark   September 24, 2009 at 7:20AM
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Looks like a Headcoat screw to me, they are SS w/powdercoated head.

    Bookmark   September 24, 2009 at 7:52AM
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No way are they stainless steel screws, because those are stains. Stainless=no stains. You're gonna have other problems too, as there doesn't seem to be any gaps between the boards. Rain won't drain.
As for sanding and sealing...that won't make the stains go away. They will keep coming back.


    Bookmark   September 26, 2009 at 6:26AM
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Maybe it's just my monitor or the stains but it looks like a Philips screw to me. Are Headcoat screws available with a Philips head?

    Bookmark   September 26, 2009 at 7:05PM
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If that's a philips head then not a headcoat, they come w/square drive heads. I'll second what Steve said about the no gap.

    Bookmark   September 28, 2009 at 10:10AM
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