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Author Topic: Preserving walnut on outdoor pavilion  (Read 549 times)

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Offline Ronnie

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Preserving walnut on outdoor pavilion
« on: June 13, 2017, 10:01:58 pm »
I am going to build a 20x20  outdoor pavilion out of walnut. How can I preserve the walnut color without it going grey. It will be built with green wood, can I treat green wood with anything? How can I build this thing with green wood and keep its walnut beauty?
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Offline stickframer

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Re: Preserving walnut on outdoor pavilion
« Reply #1 on: June 14, 2017, 01:50:54 pm »
Ronnie,

There is several products. LandArk exterior finish, Permachink wood finish, spar urethane, etc. A lot of people are against spar urethane because it can blister. I used ready-seal on several products and it has worked well. Something like walnut deserves a higher quality product  ;D

Offline Magicman

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Re: Preserving walnut on outdoor pavilion
« Reply #2 on: June 15, 2017, 09:44:14 am »
Oxidation begins the instant that the log is opened.  The lumber immediately begins to loose it's green color and turns brown.  Even if you can seal it to prevent further Oxygen exposure, you will still have the Sun's UV rays to contend with.  Sealers like "Helmsman Spar Urethane - Exterior Polyurethane"  have UV "inhibitors", but they are not "preventers".   :-\
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Offline Ronnie

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Re: Preserving walnut on outdoor pavilion
« Reply #3 on: June 15, 2017, 12:46:01 pm »
I guess I am wondering if theres any point in building it out of walnut? If its going to turn grey and I have to stain it to give it some color it may not even be identifiable as walnut? Was hoping maybe someone had built an outdoor structure using walnut.
TK2000, JD5075, Stihl 660,270,170. Sure wish I had a kiln and a swing blade mill.

Offline Magicman

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Re: Preserving walnut on outdoor pavilion
« Reply #4 on: June 15, 2017, 09:29:25 pm »
It should not turn gray like Oak or Poplar, but get darker.  Darker could be good.
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Never allow your "need" to make money to exceed your "desire" to provide quality service.....The Magicman

Offline Jim_Rogers

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Re: Preserving walnut on outdoor pavilion
« Reply #5 on: June 16, 2017, 10:43:37 am »
I thought I had heard that dark woods lighten with age and light wood darken with age.

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Offline woodworker9

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Re: Preserving walnut on outdoor pavilion
« Reply #6 on: June 17, 2017, 10:24:31 am »
There are quality finishes available for protecting a species like walnut, but you can not use non-dried wood.  Epifanes is a finish used by the best boat builders, and I have used it several times on exterior projects.  It is fabulous, last a long time, but nothing lasts forever.  The finishing schedule is grueling, with 7 coats applied, and plenty of wet sanding work in between.  It is spectacular, but labor intensive, and quite expensive.

Short of that, I'm not familiar with any product that will work on "green" walnut that will last. 

Walnut is a beautiful wood, but there are better choices for exterior uses that will hold up to the elements much better.

Not what you want to hear,  but I can only tell you what I've learned in a career of woodworking.

If you learn of something new that works well, please let us all know.   Walnut is one of my favorite woods.
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Offline Don P

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Re: Preserving walnut on outdoor pavilion
« Reply #7 on: June 18, 2017, 10:39:41 pm »
I've never tried walnut outdoors but my understanding is that it is listed as quite "durable".
https://www.fpl.fs.fed.us/documnts/TechSheets/HardwoodNA/htmlDocs/juglans2.html