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Mark J

Moisture meter suggestions

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3 hours ago, wdwerker said:

Just my thoughts, no science or anything. After boards have cracked, warped or twisted on you caution becomes second nature. 

Like you, no science. Just my thoughts: I think if I had a stack of lumber or even just a few boards that needed to be monitored, I would rather drive a pair of the smallest brads I could find through to the center and leave them. I could then remeasure periodically using the same nails until I got the readings I was looking for. With a little planning, I might find a location that would be cut away later. However, I think the odds are that they would not fall in a critical area; especially if you could plan to have the holes on the back side of project piece. Even without that, I think the small holes could be made very inconspicuous most of the time.

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Should be no problem to conceal a couple of small holes in the edge of a board. Depending on how wet the wood is a rust stain might be harder to conceal.

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Good point. I think oxalic acid or something similar will remove rust stains? Otherwise, we need to use a corrosion proof nail; ss, cooper, brass, etc. or galv.

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I think that stainless screws would work fine in so far as taking readings is concerned. Although, the holes would be larger. SS 23 ga pin nails might do the job. Just don't drive them all the way.

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23 gauge nails have about a 40% chance of snapping off when you try to pull it out of hardwood.  I go through at least 25-30 thousand micropin's a year.  I've had to pull quite a few for one reason or another. I've even got pliers designed to pull brads. Maybe 95 % or more long 18 gauge nails come out just fine but 23 gauge nails in hardwood will snap unexpectedly when you try to pull them. 

Pilot holes a bit smaller than a brad hand driven is another approach. Brass brads with a head are called escutcheon pins, those could work.

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Good point. I have some brass escutcheon pins that I use from time to time. Their shank is a bit fatter than I like for the purpose which means the holes might be more difficult to mask if necessary, but they would certainly work.

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Nail idea sounds great, theoretically, or for one board.  What about a stack of boards (the usual case.)

I can see nailing the ends, and/or nailing one in the center of the board;  I think some sampling is required.

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8 hours ago, Pondhockey said:

Nail idea sounds great, theoretically, or for one board.  What about a stack of boards (the usual case.)

I can see nailing the ends, and/or nailing one in the center of the board;  I think some sampling is required.

My understanding is that it is common to put nails into several boards in a stack and run wires to the outside of the stack in order to take periodic measurements without unstacking. This is only what I have read. I have no experience doing it.

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