Cupped Canarywood boards

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Forum topic by Jim Crockett (USN Retired) posted 01-22-2010 11:18 PM 790 views 0 times favorited 1 reply Add to Favorites Watch
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Jim Crockett (USN Retired)

852 posts in 3154 days

01-22-2010 11:18 PM

A couple of months ago, I purchase a couple of 6” wide x 22” long x 3/8” thick canarywood boards on ebay. The lumber arrived and was absolutely gorgeous, nicely planed/sanded and perfectly straight.

I immediately stickered it and placed it in the overhead of my garage/workshop to keep it away from the concrete floor. 3/4” stickers and plenty of airspace around the boards.

With the holidays and all, I hadn’t dug it out for a project until yesterday. The pieces are cupped at least 1/8” across their width!. I’ve had this before with oak and maple and I’ve been able to at least partially remedy it by wetting the concave side and overclamping them for a short period. Well, I tried it with the canarywood and ”SNAP”, split nearly the length of the board and I hadn’t really applied much pressure at that point.

I’m so disappointed and upset – the wood is so beautiful! I’m sure I can glue the split but that isn’t going to get rid of the cupping problem. Can’t really sand them down because it wouldn’t leave much left to work with (I don’t have a planer). Don’t know if I can even up the moisture in the two sides by placing the board on a table in front of a window – if it were summertime, I’d place it outside in the sun on the grass for a few hours and that sometimes works. But our grass is under 20” of snow right now – don’t think sitting it on a snowbank would have quite the same effect!

Anyone have any suggestions or an explanation of why the cupping may have occurred in the first place. I still have one piece left of the canarywood that is cupped but I haven’t screwed up yet.

My only thought is that at this time of year my garage/workshop is maintained at about 55ยบ and with the cold outside and the heat on inside the humidity is pretty low. So I suppose it may have been a difference in humidity between the seller’s shop and mine causing a moisture imbalance between the two sides of the wood. But I thought stickering was supposed to prevent that.

I suppose I shouldn’t be so upset but I can barely afford to buy wood and when a piece of two gets ruined it’s difficult. On top of this both my knee and back feel like someone is driving hot spikes into them and I can barely get around. But I wanted to get started with this great wood and make something regardless of my pain. Oh well, there will be other days!


-- A veteran is someone who, at one point in his/her life, wrote a blank check made payable to "The United States of America," for an amount of "up to and including his/her life".

1 reply so far

View EricRFP's profile


106 posts in 2514 days

#1 posted 01-23-2010 06:31 AM

“Anyone have any suggestions or an explanation of why the cupping may have occurred in the first place.”

The wood was either not dry enough(under 12% MC).... or the wood was “dry” but your local climate, temperature, humidity was different(most likely lower) than where the wood was sent from.

Wood is hydroscopic and will lose or gain moisture on a continuous basis.

On Ebay, it’s hard to say but it may not be the sellers fault. PM me the seller’s ID and I might be able to give you a little insight.


-- Eric, NorCal

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