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Deck Posts. Paint Them, Or Wrap Them?

 
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Old 10-10-2018, 10:03 AM   #1
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Deck Posts. Paint Them, Or Wrap Them?


2 story covered deck. More like a porch.

1st floor is an EPDM, because it covers a basement.

I didn't use PT, because I'll do just about anything before I install a 20' PT 6x6. Nasty $#!T.

I don't have to worry about the top of the post, because it has a roof with overhang.

My original plan was to wrap the posts with Tyvex, and trim them out. I'll put spacers in, to allow any water that might soak through to drain.

There will also be sheet metal flashing at the bottom, where the posts penetrate the basement roof.

And I designed a sort of elaborate flashing and counter-flashing set-up for the second story, where the 4x12's are attached.

But a contractor friend of mine suggested I just paint them. He's concerned about water getting trapped behind the trim, and concealing rot.

I'd be worried about the 4x12 to 6x6 connection, with only paint. As soon as water gets in the crack, and starts seeping into the end grain......
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Old 10-10-2018, 10:43 AM   #2
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Re: Deck Posts. Paint Them, Or Wrap Them?


What does the 4x12 to 6x6 connection consist of?

Is the 6x6 notched to accept the 4x12 or were you thinking to use a Simpson type connector or what?

I'm not seeing it here.

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Old 10-10-2018, 10:58 AM   #3
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Re: Deck Posts. Paint Them, Or Wrap Them?


Simpson HUC 412.

Here's a pic of the corner connection.

I'm thinking of having a sheetmetal guy fab a piece for the post, that will lap over the 4x12 on top, then the trim over that.

If any of that makes sense.

I can always try to draw something.
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Old 10-10-2018, 11:00 AM   #4
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Re: Deck Posts. Paint Them, Or Wrap Them?


If all I do is paint that, then water runs down the post and seeps into that connection, where it'll soak the end grain on that 4x12.

I could pretty much eliminate that possibility with some metal flashing, but then it'll be exposed and look like crap.
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Old 10-10-2018, 03:49 PM   #5
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Re: Deck Posts. Paint Them, Or Wrap Them?


I get it. I would recommend sealing the ends of the 4x12 with exterior wood glue like TitBond III.
Then install as normal, no special flashing or anything like that. Keep it simple.

It would be able to be painted over also if desired.

Andy.
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Old 10-10-2018, 06:07 PM   #6
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Re: Deck Posts. Paint Them, Or Wrap Them?


Wrap em
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Old 10-10-2018, 06:41 PM   #7
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Re: Deck Posts. Paint Them, Or Wrap Them?


I'd seal the end grain and paint it. You can spray with something like boracare. I personally use diluted ethylene glycol before acrylic painting to prevent fungal rot.
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Old 10-10-2018, 06:48 PM   #8
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Re: Deck Posts. Paint Them, Or Wrap Them?


they can be wrapped and made to look nice.
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Old 10-10-2018, 06:51 PM   #9
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Re: Deck Posts. Paint Them, Or Wrap Them?


Why not seal end-grain and caulk joint?
Or kerf a metal flashing.
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Old 10-10-2018, 06:58 PM   #10
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Re: Deck Posts. Paint Them, Or Wrap Them?


So what you're saying is, if I'd made up my mind before I installed them, I could have sealed the end grain, painted, and saved a bunch of time.


My idea for wrapping is something like this.
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Old 10-10-2018, 07:17 PM   #11
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Re: Deck Posts. Paint Them, Or Wrap Them?


Quote:
Originally Posted by Tom M View Post
Why not seal end-grain and caulk joint?
Or kerf a metal flashing.
There is a kerfed flashing at the bottom, and I'm considering doing it at the mid-level.
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Old 10-10-2018, 07:30 PM   #12
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Re: Deck Posts. Paint Them, Or Wrap Them?


That will be a nice looking job when done.


If your going to roof the mid level deck its going to get flashed and counter flashed anyway but it cant hurt to be redundant at the beams.


I wouldnt worry about the wood vertically if you have spacers but again if your concerned brush a clear sealer to penetrate the wood. Probably more work than tvvek though
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Old 10-10-2018, 09:35 PM   #13
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Re: Deck Posts. Paint Them, Or Wrap Them?


any chance of the Tyvek trapping moisture between the post and itself?
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Old 10-11-2018, 07:45 AM   #14
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Re: Deck Posts. Paint Them, Or Wrap Them?


Quote:
Originally Posted by AustinDB View Post
any chance of the Tyvek trapping moisture between the post and itself?
Absolutely.
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Old 10-11-2018, 08:35 AM   #15
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Re: Deck Posts. Paint Them, Or Wrap Them?


in that case, a rain screen sounds like a better choice
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Old 10-11-2018, 08:56 AM   #16
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Re: Deck Posts. Paint Them, Or Wrap Them?


Quote:
Originally Posted by hdavis View Post
Absolutely.


Yep.


There's a lot of ways moisture can get trapped in that assembly. Only advantage to wrapping is I can conceal metal flashing over the beams, and for esthetics.



Quote:
Originally Posted by AustinDB View Post
in that case, a rain screen sounds like a better choice
That was kind of what I was going for, with the spacers beneath the trim. Still not 100% guarantee, though.
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Old 10-11-2018, 11:22 AM   #17
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Re: Deck Posts. Paint Them, Or Wrap Them?


Wrap the joints with Blue Skin. It is the good sticky icky IMO. With that craftsman style case, you have lots of room for built in rain screen. should outlast all of us.
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Old 10-11-2018, 06:08 PM   #18
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Re: Deck Posts. Paint Them, Or Wrap Them?


Usually I deal with issues like this on older decks. Normally that would entail drilling a couple small holes through the side of the joist and slightly into the post, and syringing in whatever rot and insect damage prevention. Let that sit for a while, then I inject epoxy to beef up the structure and somewhat seal it.

You can probably just inject a sealer and be good.

Last edited by hdavis; 10-11-2018 at 06:11 PM.
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Old 10-11-2018, 07:54 PM   #19
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Re: Deck Posts. Paint Them, Or Wrap Them?


The blue skin idea was a good one too or similar
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Old 10-14-2018, 06:16 PM   #20
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Re: Deck Posts. Paint Them, Or Wrap Them?


Stucco. Frame them out slightly bigger for looks and stucco them.


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Last edited by Californiadecks; 10-14-2018 at 06:18 PM.
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