Tryweryn
New member
Hi if anyone can read the moisture readings, can anyone interpret them. Are they good or bad? Its a Moody 30:ambivalence:Readings above the waterline 8-12%
Below on the A scale 14-16%
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Moisture readings
- Thread starter Tryweryn
- Start date
Hi if anyone can read the moisture readings, can anyone interpret them. Are they good or bad? Its a Moody 30:ambivalence:Readings above the waterline 8-12%
Below on the A scale 14-16%
TradewindSailor
Active member
What is that letter? I hope it's not a 'professional' survey.
The meter readings would indicate to me that there is no evidence of high moisture in the hull. HOWEVER, I do not know the competency of the data gatherers. Certainly it is for them to make a statement as to the condition of the hull. Moisture meter readings are only an indication to the Surveyor as to whether further investigations are required. They are not a result on their own.
The meter readings would indicate to me that there is no evidence of high moisture in the hull. HOWEVER, I do not know the competency of the data gatherers. Certainly it is for them to make a statement as to the condition of the hull. Moisture meter readings are only an indication to the Surveyor as to whether further investigations are required. They are not a result on their own.
Tryweryn
New member
Yes it was a 2011 survey but does anyone know if the A scale is correct as are those readings not impossible on GRP? It was a sovereign master meter.
Tranona
Well-known member
If that is from a professional survey then the surveyor should be able to give you an interpretation of what it means in relation to that particular boat.
As it is an old survey and presumably not commissioned by you, whatever is in it is of limited value anyway. If you are thinking of buying the boat then it's current condition is more important than what it was like 3 years ago.
As it is an old survey and presumably not commissioned by you, whatever is in it is of limited value anyway. If you are thinking of buying the boat then it's current condition is more important than what it was like 3 years ago.
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Tryweryn
New member
From what I can gather this is a timber scale so it registers a very low moisture content.
Tryweryn
New member
Ive got a 2011 survey and trying to decide if its worth a new survey to buy or walk away.
Tryweryn
New member
Found the following on the moisture meter operating instructions. I think its worth a survey
Tryweryn
New member
TradewindSailor
Active member
The link to that info would be useful. I'm rather curious as to what it says.
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Tryweryn
New member
TradewindSailor
Active member
Thanks ..... http://www.moisturemeters.uk.com/downloads/quantammarine.pdf ... I guess is where he image was grabbed from.
That seems to be for a different meter .... it has no A or B scale. The older meters do ..... it rather depends on the calibration of the meter.
Like I say the surveyors are responsible for the interpretation of their readings ......
Tryweryn
New member
Well the survey was 2011 and i 2012 the seller spent thousands on new engine etc so he must have been happy with it. So worth a survey i think.
Tryweryn
New member
http://www.passionforpaint.co.uk/downloads/sovguide.pdf interesting page 2
TradewindSailor
Active member
From the previous url:
To the client receiving a Marine Survey Report reading references to % H2O or Relative figures can be meaningless
and confusing. The survey should provide further definition on what the readings mean and what the prognosis is;
which will be based upon the evidence available at the time of the survey.
Where there are visible physical indications of problems then these will help the surveyor with the conclusions of the
report, but where there no visible evidence of a problem and high moisture meter readings are obtained, then these
will require careful interpretation. In such cases for a Surveyor to provide meaningful interpretations, then the service
history is particularly relevant, especially if previous remedial work, or preventative coatings, have been undertaken.
Where there are unexplained high readings the recommendation should be that they are investigated further.
Internal metal fixings, tanks, chain lockers, internal condensation etc may produce misleading readings especially
from electronic meters with a “deep” function that penetrates through the hull.
However, a yacht that has been out of the water for an extended drying out period may produce consistently low
moisture readings, suggesting no further disruptive examination is necessary, but could then become susceptible
once back in the water.
Regardless of the reading obtained it would be unwise to decide whether a yacht requires treatment, or no treatment,
based solely upon moisture meter readings alone. Where there is concern then a qualified surveyor should be used
to evaluate the readings in conjunction with all the other information and factors that are available.
To the client receiving a Marine Survey Report reading references to % H2O or Relative figures can be meaningless
and confusing. The survey should provide further definition on what the readings mean and what the prognosis is;
which will be based upon the evidence available at the time of the survey.
Where there are visible physical indications of problems then these will help the surveyor with the conclusions of the
report, but where there no visible evidence of a problem and high moisture meter readings are obtained, then these
will require careful interpretation. In such cases for a Surveyor to provide meaningful interpretations, then the service
history is particularly relevant, especially if previous remedial work, or preventative coatings, have been undertaken.
Where there are unexplained high readings the recommendation should be that they are investigated further.
Internal metal fixings, tanks, chain lockers, internal condensation etc may produce misleading readings especially
from electronic meters with a “deep” function that penetrates through the hull.
However, a yacht that has been out of the water for an extended drying out period may produce consistently low
moisture readings, suggesting no further disruptive examination is necessary, but could then become susceptible
once back in the water.
Regardless of the reading obtained it would be unwise to decide whether a yacht requires treatment, or no treatment,
based solely upon moisture meter readings alone. Where there is concern then a qualified surveyor should be used
to evaluate the readings in conjunction with all the other information and factors that are available.
Tryweryn
New member
yep time to call in the surveyor....many thanks
TradewindSailor
Active member
http://www.passionforpaint.co.uk/downloads/sovguide.pdf interesting page 2
The relative scale and the % H2O is on the same meter ...... so both can be used, but it is for the surveyor to interpret them.
The relative scale and the % H2O is on the same meter ...... so both can be used, but it is for the surveyor to interpret them.
TradewindSailor
Active member
Your welcome .....
maxi
Member
It seems that what is written down equates to meter readings & I don't know of any meter that shows percentage moisture content. A good surveyor would show "calibrated readings related to moisture content" in order that you can make sense of it. As a general statement GRP can only hold circa 7% moisture, so suggestions of 18% should be treated with more than just suspicion.
Most meters will read circa 5 for a totally dry surface, moving to circa 30 for a saturated surface - interpolation & interpretation are therefore necessary. Some meters have a different scale but work in the same manner. The type of meter should be specified in the survey.
For most meters reading of 16-18 would indicate the presence of absorbed moisture but, cannot predict that this will become osmotic, as very often it will not. By the way, osmosis is only the process by which moisture is absorbed, the damage is actually caused by hydrolysis if the moisture finds something to dissolve or absorb.
Most meters will read circa 5 for a totally dry surface, moving to circa 30 for a saturated surface - interpolation & interpretation are therefore necessary. Some meters have a different scale but work in the same manner. The type of meter should be specified in the survey.
For most meters reading of 16-18 would indicate the presence of absorbed moisture but, cannot predict that this will become osmotic, as very often it will not. By the way, osmosis is only the process by which moisture is absorbed, the damage is actually caused by hydrolysis if the moisture finds something to dissolve or absorb.
