Re: Zygote: 11 years later: Hull moisture
Posted by: dwkayaks
Date: December 20, 2011 04:05PM
Category: Hull maintenance
Ahoy Bil , more info will follow , but for now ,,, the "deadwood" area, just ahead of the prop and below it, can be suspected to absorb heaps of moisture , Ouch !
During hull construction , there was a plywood dam placed into the hull. There were two such dams, one aft , and one forward at the aft end of the lead balast.
The filler resin , behind the dams, maybe could be called an "end pour", was poured into a mish-mash of floor sweepings and f/g rolled up cloth .
This could later be considered an undesirable hull fabrication practice !
On BCC Calliste hull # 72 , the moisture readings, in the aft "end pour" have always been high .
The real key , is does this high moisture reading cause a blistering concern, in that "dead wood" area or not ?
Sorry , that I am not familiar with ether Alexseal , or Milux , ?
If Fletch is still at Scarbourough , he would be a most realiable consultant, for advice.
Please do understand , that even wood in your house furniture , will measure any where from 10% (very dry) to 18 % a bit wet , moisture content.
For us boat owners we most be concerned about the difference of moisture readings in our boat hulls , those above the water line, and those below the water line !
Marine surveyors suggest taking a moisture reading at our cabin sides, then compare that to the underwater areas, when on the hardstand .
This reading may or may not show a problem area with excessive moisture absorbution.
Moisture absorbution in our hull f/g laminates , may or may not be a concern !
I have seen epoxy resin laminated boat hulls with 20% or higher hull moisture readings , but zero amount of blisters, anywhere on those hulls !
You may remember that on my boat , the f/g shaft log broke loose and allowed moisture to migrate down into the "dead wood" , below the shaft , an area that was riddled with air passages and voids , just ripe to absorb and hold moisture, thus creating high moisture readings from the outside, in those areas .
More to follow ,,,,