using a moisture meter on solid fiberglass laminate|OVERVIEW OF HULL LAMINATES, HULL CORING AND FIBER : import The scale on the left is for reading wood, or a wood cored laminate and the scale on the right is for reading solid fiberglass. As you’ll notice a 30% moisture . webBetBus s.r.l. Strada Nazionale Est 45C 43044 Collecchio (PR) – Italy VAT ID: IT02913350340
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Over time, all fiberglass hulls absorb moisture, and while small amounts are not a cause for concern, it is crucial to monitor the hull's condition to prevent serious issues such as . Most believe that the moisture percentage of a fully saturated solid (no core) fiberglass hull will have no more than 2.5% to 3.5% moisture. Most all meters are designed . The most common applications for moisture meters, in the marine industry, are for the detection of moisture within cored composite structures, otherwise known as fiberglass .The scale on the left is for reading wood, or a wood cored laminate and the scale on the right is for reading solid fiberglass. As you’ll notice a 30% moisture .
No meter can accurately tell you a percentage of moisture in fiberglass or composite cored structure. That’s not how they work. All production boats have areas of .Some meter manufactures provide a conversion table for the actual readings conversion to fiberglass (eg., 25% wood = 3% glass) hence there is no correlation between the percentage of moisture indicated by the meter and .
A dry core with a solid laminate will produce a clean, crisp sound, while a wet core will result in a deep, hollow sound. . Using a moisture meter. . To convert the reading to fiberglass, use a conversion table or change the settings on the meter. Once again, the meter can determine if moisture is present in a solid laminate even if all looks well to the naked eye. Where osmosis repair is concerned, the moisture meter will let a fiberglass specialist determine how .Why Use a Moisture Meter? The object of taking moisture meter readings is to determine whether moisture is being absorbed and retained by the GRP laminate. Persistently high moisture readings (i.e. over a period of several weeks) may indicate the presence of hygroscopic solutes such as propylene glycol within the laminate; and
7. Using Moisture Meters 173 . What does a meter really detect? 176 Are meters affected by humidity? 176 Do Meters read fluids other than water? 176 Does old gel coat absorb high amounts of water? 176. Hydrolysis 177 Water Absorption by Solid Laminates 177 Reinforcement Fabrics 181 Balsa 183. Rot in Balsa 186 Hydraulic Destruction of Balsa 187Unfortunately, moisture meters have real limitations. First off, most moisture meters were not originally intended for testing fiberglass boat hulls, but rather for testing wood in buildings or in lumber yards, or concrete, or plas-ter, or grains, and so on. Use on fiberglass boats is an engineering after-thought. In fact, one entire
Electrophysics meter: WHAT THESE NUMBERS MEAN ON CORED STRUCTURE (Again ... only with the Electrophysics meter): Moisture content of my hand: 10 - 13: Low = Core is dry to the touch. 14 - 16: Slightly elevated = Faint moisture can be drawn by applying light pressure to the core through a paper towel. 17 - 23: Elevated = Slight amount of moisture is visible in core . A consistent, solid sound indicates a healthy hull, while a dull or hollow sound may point to problem areas. 3. Moisture Meter. Investing in a moisture meter can help you detect any excess moisture within the fiberglass laminate. High moisture readings could signify water intrusion or osmotic blistering, which can weaken the hull’s structural .Moisture meters will not read frozen water; place the meter on a piece of ice and the reading is zero. Humidity levels were proven to have little effect except on wood. The difference in meter readings on a laminate at 40% humidity versus 90% was only 4 points on the meter scale.
In the last installment of our continuing exploration of how fiberglass sailboats get built we looked at the different types of fabric that can be used to create a laminate. As mentioned in our first episode, however, any fiberglass laminate is in fact a composite material (just like papier-mâché), consisting both of glass fabric, which provides structural strength, and plastic .It is difficult to determine how much water a fiberglass hull laminate must absorb to cause gelcoat blistering. On some hulls the . blisters are present open them and grind to solid laminate. Scrub and rinse these areas with fresh water. Be sure bilges are dry as water . must be employed in using a moisture meter, as there are many factors . It's been a few years but I finally got around to doing an article on DIY use of a moisture meter. Moisture meters can be had for well under 0.00 and will pay for themselves ten fold over your boating life. In fact they are free usually after the first use. Please don't buy the hype and scare tactics used by "surveyors" about how "difficult .
Use moisture meters or conduct a relative humidity (RH) test to check for moisture under vinyl flooring. . I often see flooring problems where new laminate or vinyl flooring products are applied over top of existing hardwood flooring, both on concrete slabs and on wood subfloors elevated above crawlspaces. The new flooring acts a vapor .I had recently responded to a blog post on Linkedin about the effectiveness and accuracy of moisture meters on fiberglass boat hulls. My post had to be approved by the moderator which was ran by a yacht broker.Which it never was approved or posted, however other posts condemning the use of moisture meters and insinuating in some other posts that marine . Check for Moisture: Use a moisture meter to check the moisture levels in the transom. Timber has a natural moisture content of between 5 and 15%, so higher readings could indicate a problem. If you don't have access to .Benefits of using a non-destructive moisture meter for boat surveys One of the primary benefits of using a non-destructive moisture meter, such as the Tramex Skipper 5 Moisture Meter, is that it allows boat owners, operators, and .
Well, that’s where moisture meters come in handy. But first, some background. Strands of fiberglass, whether in chopped or mat form, don’t absorb moisture. Neither does resin. If water intrudes into a panel that’s just a gelcoated fiberglass laminate, not much really happens — provided the resin was fully catalyzed and cured to begin with.
A pin-type moisture meter works by using electrical resistance to measure the moisture content of a material. When the meter's pins (electrodes) make contact with the surface of the material being tested, they complete an electrical circuit.However, pinless meters require a flat, solid surface to work properly—if the scanning plate cannot make smooth contact with the surface of the material being checked, the meter’s accuracy will be reduced. Pin meters, on the other hand, are better able to determine the distribution of moisture throughout a material sample from the shell to .
The Dolphin will provide accurate readings to a depth of 2.54cm (1”) in fiberglass. In use for over a decade, moisture meters were originally designed for use on wood but they are equally valued for measuring the moisture content of man-made wood composites as well as fiberglass, concrete and brickwork. com). When Perette inspects the laminate of a boat, he takes two tools with him: a moisture meter and an architectural hammer. “Your average Joe probably doesn’t have a moisture meter, but you can get an architectural hammer at just about any hardware store for about to ,” he says. 10. Not using a moisture meter at all; A moisture meter is a necessary and valuable tool, whether you lay down wood flooring, build furniture, or fashion violins. Whatever type of woodworking you do, you need to use the moisture meter properly, or it’s not doing you – or your project – any good.
Understanding The Moisture Meter
It had spent its entire life docked on a canal in South Florida where summertime water temperatures are as high as 92 degrees. This is a very well built hull of solid laminate, of conventional roving reinforcement. It was so thick and hard that when we sounded it with a steel hammer, the hull "rang." This moisture meter measures the moisture in drywall, masonry, softwood and hardwood. I have used it to measure moisture levels after repairing drywall, painting and applying mortar to concrete block. Using the meter to measure the moisture content provided information on when I could apply a second coat of paint, mortar and drywall mud.Klein Tools ET140 Moisture Meter is designed to non-invasively detect hidden relative moisture content up to 3/4-Inch (19 mm) depth. Easily select between materials with mode button to test surface of drywall, masonry, hardwood, and softwood. The ET140 has easy viewing with bright, reverse-contrast display and LED bar graph.
It’s obvious that the pressure from the bunks is the direct cause of whatever this is. Either it aided in the osmosis of water into the laminate, or it caused some physical change that can be read by a moisture meter. Maybe it’s a change in density or some effect on the resin. The meter I am using is a General Tools MMD7NP.
These stray elements can react with any moisture in the laminate to form expanding bubbles of mixed chemicals and can even develop within a few years of a new boat being launched. . you will need to determine the extent of the hull damage using a moisture meter. . polyethylene foam pads, or use an extra thick base of solid GRP. Fixtures and .
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using a moisture meter on solid fiberglass laminate|OVERVIEW OF HULL LAMINATES, HULL CORING AND FIBER