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Beetle damage in oak

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Forum topic by gtp1500 posted 02-08-2017 07:00 PM 409 views 0 times favorited 5 replies Add to Favorites Watch
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gtp1500

2 posts in 312 days


02-08-2017 07:00 PM

New here, I completed this reclaimed barnwood oak table a few months ago, some of the oak had significant beetle damage but I hoped it was old as I never saw any beetles while I was building.

Where there was damage I cleaned the trails and epoxied them then applied several coats of spar urethane.

Now the customer has sent me this pic of one of the benches, I’m afraid it’s possibly beetle dust or chewed urethane?
As you can see it’s a large table so I am concerned on my next move.
Thanks…


5 replies so far

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WDHLT15

1695 posts in 2315 days


#1 posted 02-09-2017 01:19 AM

It is best to heat reclaimed hardwood in a kiln to a temp of 150 degrees and hold for 24 hours. Too late to do that now. Powderpost beetles can live in dry hardwood timbers and boards for years.

-- Danny Located in Perry, GA. Forester. Wood-Mizer LT40HD35 Sawmill. Nyle L53 Dehumidification Kiln. hamsleyhardwood.com

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pintodeluxe

5466 posts in 2652 days


#2 posted 02-09-2017 01:26 AM

An outdoor table will be subject to re-infestation, even if it was properly heat sterilized.

The bigger problem may be that the end grain is edgebanded :(

-- Willie, Washington "If You Choose Not To Decide, You Still Have Made a Choice" - Rush

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TheFridge

8333 posts in 1325 days


#3 posted 02-09-2017 01:45 AM

I’ve cut ash that had no activity for months and hit a larvae when jointing it.

Whatever you do it will probably not be fun.

And the mitered end caps will separate before long as the top expands.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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JBrow

1275 posts in 759 days


#4 posted 02-09-2017 01:57 AM

gtp1500,

I am no bug expert but have used previously infected lumber. I have not used epoxy on an outdoor project where the epoxy is exposed to sunlight. In spite of my shortcomings I offer a guess as to what might be happening, which I hope is helpful.

From the photo I mainly see the tracks that were made by the beetles and revealed during milling. My understanding is that wood boring insects bore into the wood and do not eat from the surface except to enter the wood. I do see a few “shotholes” which may be pre-existing since I failed to observe the fine powdery dust left by the boring critters (frass) and since frass was not mentioned by the client or you.

The insect tracks no longer appear to be filled with epoxy but many have a white residue in/near the exposed tracks. Therefore, I wonder whether what the client is observing is a failure of the epoxy. If the epoxy filled areas are exposed to sunlight, perhaps the epoxy has broken down in spite of the spar urethane. I suppose the credibility of my guess is whether and what extent the bench was protected from sunlight. I also wonder whether large and rapid temperature changes could have effected the epoxy.

Here is an article concerning powder post beetles that may be of some value…

https://entomology.ca.uky.edu/ef616

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gtp1500

2 posts in 312 days


#5 posted 02-09-2017 02:32 AM

Thanks everyone for the replies, yes the banding has concerned me, the customer really wanted the look of the banding as he’s seen other tables that were banded.
I’m curious when you see tables banded by some of the “major” barnwood table makers are they doing something special to keep them from separating?

I am hoping the white is just something going on with the epoxy.
I admit that I’m very new to all of this and am eager to learn everything I can, I’ve deffinately made mistakes and hope I don’t need to haul that heavy thing home, rip the banding off and “remanufacture” it.

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