This can be measured by mainly two methods Standard Proctor Compaction Test and Modified Proctor Compaction Test.Both the tests help to determine the optimum moisture content that is required for soil to attain maximum compaction i.e maximum dry density for … Moisture Content of soil can be determined by two methods; 1. Mold starts growing if the moisture contents reaches about 25% moisture content. It’s more important to understand that the wood is kiln-dried down to a certain bell-shaped range of MCs. Measuring Moisture in Wood Flooring. Hello Larry hello I been getting very sick in my home so I had my manger do a mold and moisture test which came back high level of moisture levels which a contractor wants to take the sub floor up and 2 to 4 inches of the wall but my apartment manger is not releasing to report and he’s is saying the spore test didnt pick up any mold spore… question is it safe for me and my family to be in the home with high level of moisture in the restroom which the floor have been really soft for over 9 months now as well as the kids bedroom where a pipe burst. They said if i wanted to spend the money, a humidifier would help keep the humidity inside the house more consistent throughout the year. It’s never constant. In March of this year I had new white oak 2” flooring installed. The more specific way to know would be to measure the relative humidity and temperature in your homes air and then plug the numbers into a calculator like this This will tell you what the MC% should be based on your specific environment. It’s always a good idea to check with the manufacturer of the finish also. What Do These Moisture Meter Readings Mean? The next sheet is 21.5% adjacent to 2X4. So, when looking at the relative humidity of the space, spaces left above 70% RH for extended periods will also promote mold growth. Second, would the same pine slab, would it be okay to use for a side table or Kitchen island. One of our new line of moisture meters will help locate areas of high moisture, if it still exists. Moisture Content on Dry Basis. What would be the recommended MC for doors of my new building(under construction)? Sorry, that time of year. The other was for a $100 retail gift card. Perhaps better drainage around your house will do the trick… or treat. The laboratory analysis is required to be corrected to the actual moisture content in the field. With the WoodH2O-app I could deduct the EMC for The Netherlands would be between 15 and 16. The levels were between 20 and 23%. The National Wood Flooring Association (NWFA) has a chart that indicates the moisture content of wood at any given combination of temperature and humidity. Although some movement can be expected between 6% and 9%, wood flooring can shrink or swell more dramatically outside this range. Many of our customers are successfully using our hand held moisture meters on engineered flooring. Your table may have been a little too high in moisture, hence the crack as it dried slightly in the drier environment. The lumber was recently milled, although the tree had been cut months, years ago. This method uses the oven-dry method and then compares the results to those obtained using a moisture meter. Moisture Testing, About 5/16 penetration into the wood measures 8% using pins only. My question for you is: after a smallish unheated underground space (similar to a basement, i.e. This will be today's focus. Too little or too much can alter food properties. You are correct, furniture grade hardwood is typically dried between 6 to 9%. Be on the lookout for flooring failures such as swelling, buckling, cupping, etc. The floor (under carpet) had long-term water exposure supposedly from a shower in the adjacent bathroom (according to the plumber). It is also a good idea to use a moisture meter after the three weeks just to make sure. Moisture content can affect the physical and chemical properties of food, which directly correlate to the freshness and stability of … As the humidity decreases, the MC decreases, causing the wood to shrink. If an interior location has an average RH of 40-52%, wood placed there will have an average EMC of 8-9%. Thank you for the well described article. The normal outside equilibration moisture content (EMC) for Indiana is anywhere from 13% to 16%. Here is a link to our moisture meters, thermo-hygrometer, and Smart Logger. Room size, L-shaped, is 21.5’ x 12.5’ and leg of L is 8.5’ x 11’. I am having a section of our 3.25″ Maple hardwood floor replaced. If your subfloor is a wood product, make sure the reading is less than 20% on the moisture meter. You should be able to specify a lower moisture content. We have had an abnormally wet spring and part of summer. I installed a sump pump and 6 mil vapor barrier, but the barrier is not sealed around piers and the ground is moist under the barrier all year. I had a water leak under my crawl space which has 3 inches of foam insulation applied to the underside of the sub floor. Moisture content (M.C.) If that is the case you need to remove the flooring and examine the subfloor. I just bought a live edge slab of Cherry from a local sawmill that was kiln dried. A moisture content reading of 25% is borderline to support mold. The engineered wood floor appears ok. I live in upstate South Carolina. Keep monitoring it. Thanks. It will continue to absorb and release moisture until it comes into balance with the surrounding air. 1. In this case, what Built in # that I can use to measure flooring. What do you recommend the reader to be at before insulation and drywall on new construction? At that point in time, we did not have a conditioned house. Doesn’t sound like this has been a problem in the past. 1. in Indonesia there are a lot of raw materials consisting of natural fibers, such as: pandanus, water hyacinth, rattan etc. Hardwood flooring needs to acclimate at least 2 weeks, in service conditions, before it is installed. I get some water seepage through an exterior wall at basement floor level as a result of heavy rain. Other articles where Moisture content is discussed: cocoa: Fermentation: …become plump and full of moisture, and the interior develops a reddish brown colour and a heavy, sharp fragrance. Wood is hygroscopic. It does the same for wood, and is especially hard on softwoods, such as pine or fir. Question for the expert: i recently replaced a toilet that had a leaky wax ring. If any of these conditions occur, tell your installer right away. In the Midwest, the EMC of wood or lumber in Des Moines, Iowa, ranges from 12.4% to 14.9%. I checked it with my new moisture meter and had a reading of between 8-13.5%. The moisture content of properly seasoned firewood should be under 20%, as firewood burns its most efficiently between moisture content levels of 15% and 20%. From a strictly static MC%, 16-20% MC for long duration is going to promote mold growth. Jerry, From a moisture standpoint, water in the basement can over time absorb into your subfloor. Colorado is cold and dry. Bound Moisture, Any time water can be absorbed into a material such as wood, drywall etc, it’s always a good idea to check for excessive moisture, especially if you suspect a leak. We don’t know if we still should be having a commercial drying process? Hi Moisture Experts, Thank you so much for your time and expertise. Moisture was around 25% when milled, and the ends were sealed. For example, from 25% to 45% or from 45% to 65%. Basically, wood moisture content is the We will be building fir windows. Or perhaps I should advise them to buy Wagner meters, for better accuracy ;-). He added that plastic sheet ground covering that his company laid over my crawl space had been moved in spots and that I no longer had full coverage. Lacquer will not make a reading difference as long as there are no metallic components in the lacquer itself. Thank you. 800-634-9961, or email The ASTM D4442 standard determines the accuracy of wood moisture meters. Percent moisture content in wood is the ratio of the weight of water compared to the overall weight of a piece of wood. Moisture Content. Since wood is hygroscopic, it loses or gains moisture depending on the relative humidity of the surrounding air. You mentioned it was installed just 3 days after it was delivered. A 10% moisture content reading means that 10% of a wood sample’s weight is due to water in the wood. It can be helpful to think of it as the percent by mass of water in a sample of a mixture or form of matter. I really need to know as I am getting so many different opinions The fastest way to measure moisture in floors is to use a moisture meter for wood. Your reading of 12.5% tells me it is workable. In your area, wood that has been in an environment to a duration of time would be between 6-11%. Water content is used in a wide range of scientific and technical areas and is expressed as a ratio, which can range from 0 (completely dry) to the value of the materials’ porosity at saturation. Make sure they’re aligned with the grain and not across it. Thank you. This is a great site about moisture content. Here is a link to our website for more information: Hello, Paul here. In this example, soil runoff was analyzed using a simulated rainfall study in order to determine the retention of a compound in moist soil. So, i had one installed a few weeks after we met. The boards have dried nicely so far with minimal warpage or checking. The difference is the moisture meter’s measurement error. Standard construction studs such as 2×4 and 2×6’s are typically dried to 19% moisture content before they are installed. Moisture content analysis in food is the cornerstone of prevention. In their warehouse, and perhaps partly also in the container. Continue reading MC in the home. Copyright © 2020 Wagner Meters|Warranty|Return Policy|Terms & Conditions|Privacy Policy. Moisture content is one of the most commonly measured properties of food materials. Instead of addressing the plumbing and damaged wood, they installed a dehumidifier in 2015. Moisture in coal varies from the point where it is received to the point where it enters the boiler. You can hardly see the humps except the first pier that popped up ¼”. The purpose of acclimating is to allow the flooring to equalize to the surrounding conditions, no matter how large the room is. by loss on drying, in which the sample is heated and the weight loss due to evaporation of moisture is recorded. Moisture States: Since aggregates contain some porosity, water can be absorbed into the body of the particles or retained on the surface of the particle as a film of moisture. What do you recommend? Set the meter to the species that makes up the bulk, in this case, the plywood. Measured in the 10% area. Wood must always be allowed to acclimate or come into balance with the RH of the end-use location. The chart below will clear things up. I have 1 1/2 ” thick cherry boards that I had milled from a tree in my yard last fall. i want to make a headboard from it. However, this is the recommendation for the moisture in a home and does not necessarily provide an accurate reflection of what percentage of moisture sheet rock should have. I’m trying to find specs on treated lumber for NC. Does that seem normal. The National Wood Flooring Association (NWFA) has specific installation guidelines for wood flooring and how they relate to moisture content. In the world of material testing, moisture content is different things to different people.However, there is a common concern. So we are seeking redress, but there are jacks present underneath the home which the home inspector didn’t report either and didn’t know if this was extra support for the water heater or what. WME? Would you be able to say anything about the optimal MC range for this specific situation? Insert the pins into the surface of the wood you want to test. Water content is used in a wide range of scientific and technical areas, and is expressed as a ratio, which can range from 0 (completely dry) to the value of the materials' porosity at saturation. Hi, in MN where extreme temperatures are very hard on homes. Beekeepers must be able to control the moisture level with a good degree of accuracy. I don’t know what to believe except the company who installed the vapor and dehumidifier said the vapor barrier needs to be changed out because of all the sewage and drainage stains after the plumbing is fixed. Thanks for the question. I suggested replacing my dehumidifier (Sears brand, bucket collection) which has been inoperable this past year. It is also possible high moisture has entered the container during the trip to Europe. Karl Fischer Titration, As with any wood product, the environment where the finished product will “Live” will determine the correct moisture content. I would think it would vary depending on the contents. 17 and the flooring is at 6 to 7. The following four moisture states are defined: I think that I know my own answer, but thought I might reach out for some possible better insight. Thanks for the reply. Question: Just to make sure that you get accurate moisture measurements, has your moisture meter been checked for calibration? Any moisture content measured higher than that might result in movement, such as warping and twisting, once it dries. However, this range will vary slightly according to the geographic region because of varying RH levels. That’s why I think the wood is either not dried to 14%, or it has picked up too much humidity after drying. Home » Moisture Meters » Acceptable Moisture Levels in Wood – Knowing the Moisture Content. Is it possible to get a 99.9% moisture reading (using a Cassain GM-200 hydrometer) on a particle board floor which looks and feels completely dry? For example, if the expected EMC ranges from a low of 6% to a high of 9%, the baseline moisture content of the wood would be 7.5%. or finally the product will be placed where. It will be there for a few months before I begin working on it. Pin-type meters use penetrating electrodes and measure the wood’s moisture content using electrical resistance. Let us indulge in a short digression to the main techniques we use to get closer to some answers. The moisture ranges from 11% -16% according to my meter. Again, the correct moisture content will depend on the surrounding conditions. Elaine, It was such a good read. To establish a baseline for wood flooring acclimation, the installer will need to calculate the optimal moisture level of the wood by dividing the region’s high season and low season EMC. In fact, according to M. Steven Doggett, Ph.D. LEED AP, the founder of Built Environments, Inc., wood moisture content as high as 15% can cause corrosion of metal fasteners and at 16% may lead to fungal growth. MC d = m h2o / m d (1). So a friend of mine has some pine and oak blabs at MC levels of (oak – 11.5%) and Pine 13-14%. summary We use cookies to personalize your shopping data and ads. That doesn’t make much sense to me. Here is a good source for mold and wood: Just press the scanning plate against the wood’s surface, turn on the meter, and receive the reading. Click on the button. Because wood shrinks and warps as it dries, woodworkers want it to be pre-shrunk before they use it. I want to use it to build a table and will be moving it to the location where I will work on it shortly. The fir windows and exterior doors will be affected by the the exterior and interior RH. Furniture maker Lonnie Bird weighs in, “I don’t want the wood to shrink after I use it because the wood will warp or split.”. New roof first week of November. Over a year ago, I re-shim all the piers with metal shims. This is all very helpful information, thanks! Moisture content of 11.5% for the oak is a little high for furniture grade hardwoods. It can be given on a volumetric or mass (gravimetric) basis. Page 1 of 6 ‘Good Hygiene Practices along the coffee chain’ Let’s go over the basics of each…, Oven dry testing is the oldest method for measuring the moisture content of wood. The electrical current will then move from pin to pin and measure the resistance encountered. There are legal limits to the maximum or minimum amount of water that must be present in certain types of food. I have used spar urethane as a finish on a few other 12 to 18 MC (semi-wet) log projects that turned out wonderfully. I buy many Artificial Trees for our Stores, which has Wood Stems/Barks, mainly produced in China & Shipped to UAE. These include warping, cracking, buckling, diminished wood strength, corrosion of fasteners, and even fungal growth. Turn on the meter. Last week, as I was reflecting on a recent moisture content problem, I recalled our series “Loss-on Drying and Other Moisture Mysteries.” In that series I examined moisture chemistry in products. They were installed over existing plywood subfloor. How to test moisture /water content in cassia bark? When I purchase it it’s soaking wet and I’ve always given it a few weeks, stickered and covered for at least 2 weeks, sometimes up to a month, to get it down to around 17-19%. where Less than 5% total moisture content at the base of a wall is unlikely to represent severe rising dampness, and around 5% at the base of a wall (the base of a wall means the base, i.e., at the floor/wall junction - not 100mm, 250 mm, etc, above!) Most types of wood species will mold above 25% moisture content, including pine. The water eventually came out a electric outlet located three inches off the floor. The water wasn’t properly dried and organic growth was discovered by previous owner. I would love to be able to give you the perfect answer but unfortunately, there isn’t one. It is impossible for me to tell you what the percentage of furniture should be, but if you know the EMC in the area it will be kept, you can check the MC continuously until you reach its EMC. Looking back at pictures of the build process, they brought the hardwood bundles into my home in late October of 2017 and installed them 3 days later. Do you agree with this? One note is that we did have some fungus growth in our crawlspace during the construction phase prior to the crawlspace being sealed and had the contractor come and spray and clean the floor joists and subflooring where applicable. I’m not sure which part of Europe you are from, but typically the Indonesian climate is very humid compared to other parts of the world. Wagner Meters has a couple of resources to help you determine the moisture content more suited to your outdoor environment. They do no give up moisture unless rubbed hard. our question is do we need to replace the floor to avoid fungal problems? The company they hired measured 47% in the ‘wood’ and declares that this must be ripped out and replaced. Should I wait for the slabs to be within that 6-9% to cut and glue? P.P.S. Three years ago, the floor sank in a heavy traffic area and an engineer told me Masonite was used to shim and had compressed. Installers should also measure the moisture in wood subfloors and concrete slabs as they can also affect wood flooring. I don’t know what type of floor you have, but if it gets wet enough, about 25% moisture content or higher, mold can grow. And would it be normal for the MC to vary from board-to-board and one end of a board to the other? My house is 24 years old. About how long do you think we should allow the new wood to acclimate in the end use environment before installing it? The National Association of Home Builders’ Green Home Building Guidelines for solid strip flooring and wide-width flooring are as follows: summary Moisture content is a measure of the amount of water or water vapor contained within a substance. The moisture content of a seed will equilibrate with the relative humidity of the air surrounding it. Different wood? L − 1 KCI by suspending a soil aliquot in solution for 30 min, followed by measurement with a standardized Fisher Scientific Accument 50 pH meter. Also, the glue manufacturer should ideally give you some specifications for max and min moisture content. Here is a link to a calculator and table: I so appreciate your treatise on this issue. In the end, we must compromise rather than seek absolutes, focusing on what actually works for each product, process and end result desired. Writing all the way from Australia, Steven. The manufacturer of the oil-based poly should have a specification on the maximum allowable moisture content of the wood. hbspt.cta._relativeUrls=true;hbspt.cta.load(75757, 'ae9ae817-d7a4-4033-940f-2b079941b03d', {}); Topics: With a degree in Computer Systems, Larry is involved in both hardware and software development of wood moisture measurement solutions. Phil. The fir stock was originally KD’d to around 8% but has been covered and stored outside for over a year and currently MC is around 12%. Thanks! To make sure the wood is properly dried, he always uses a moisture meter before working with it. Wood moisture meters for flooring applications come in two varieties: pin-type and pinless. The process is time-consuming but produces accurate results if followed correctly. Then placing his pin meter on the screws. Thanks for the question. When the complexity of that task becomes apparent, we are tempted to question whether we care. I found your moisture levels column through a search for “good wood for low humidity”. Either one should be acceptable for finishes. Observed water leaking along seams of several sheets of original plywood in attic. There are two main ways of measuring wood moisture content: oven-dry testing and moisture meter testing. For wide-width solid flooring (3” or wider), there should be no more than a 2% difference in moisture content between properly acclimated wood flooring and subflooring materials. Because pinless meters scan the wood’s surface and cover a larger area than pin-type meters, they provide a more thorough picture of the wood’s moisture content. A separate reference scale setting can be used for getting qualitative readings of moisture in other wall materials (like plaster). He wants to install his company’s system, seal all external openings around connections, etc. Also, please feel free to provide us with the number that you called so we can make sure that all of our phone numbers are printed/posted accurately! We built our home from ground up and have a sealed crawl space dehumidifiers, etc… In January of 2019, we had our builder and hardwood floor contractor come out because our hardwoods were starting to separate a lot. (EMC) than other pieces of wood, depending on its location. Why You Should Use Relative Humidity (RH) Testing, Become a Wagner Meters Authorized Distributor, Flooring, Millwork, Furniture and Cabinet Manufacturers, Musical Instrument Manufacturer and Luthiers, Building Restoration and Inspection Professionals, Acceptable Moisture Levels in Wood – Knowing the Moisture Content. An easy, catch-all method to get at water content levels remains elusive. Speedy Moisture Test. So please help us to know what should be required moisture level in Acacia board in final product if we need to restrict wood movement at Colorado . I hope this helps. Hi Larry, thanks for the great knowledge sharing. What can we do to get the row products closer in moisture content, we are currently using fans, I am building a farm style dining table with pecan 2″ thick X 8′-0″ long boards. I’m on a grade-level concrete slab, and the water made its way over (under the tiles) to my sink vanity. (He didn’t cite a figure.) The acceptable moisture levels of wood and lumber are in the range of 6% to 8% for interior and 9% to 14% for exterior wood or for building envelope components within constructed assemblies. The conversion puts the adjusted MC between 9.5 -> 12%. I had a quick looked around the crawl space and didn’t notice any structure damage. This particular moisture meter is ideal for checking the moisture content of walls because it has reading scales for both drywall and wood that allow for precise, quantitative moisture measurements in these materials. I really appreciate your treatise on this matter. It is a 2-3 feet wide wet area that drains to a line connected to the city system. i used my dremel with a shaping bit about 1/8 in to cut vertical slits or vents about an inch deep and a couple of inches tall into the bottom 2×4 and have kept a commercial floor blower on the wood several hours a day for more than a week yet, the number is not going down. I have about 3,000 sqft on my first floor and this was relatively consistent throughout. 2. There are joists that display splitting. My question: what is the complete saturation reading of wood? My house is 25 years old located in Oregon City OR (near Portland). I would also consider the environment where the table will live. Was told that’s not done. Mold starts to grow in the mid to high 20 percent moisture contents. We dry materials until they stop losing weight and tentatively assert that the difference between the starting and ending weights is that of the water. all concrete) is framed and sheetrocked (though not mudded or sealed in any way) is then the studs are tested for humidity, what would be a reasonable level here in Seattle, living approximately 100 yards Puget Sound? My last Wagner was appropriated by the individual who appropriated other tools out of my old sho. Timber for 9-12 months and then kiln-dry it % using pins only moisture standpoint, in. Number of different reasons: Legal and Labeling Requirements a couple of resources to help you determine correct. Back in November to some answers 's Green Guide, moisture content of products will the. Boards have dried nicely so far have arrived wet and mouldy drill bit, no how. Means the weight of the deck it swells when it gains or loses moisture, hence the crack as dries! Astm D4442 standard determines the accuracy of wood is the cornerstone of.! Measuring wood moisture content column through a search for “ good wood for low humidity ” curling! On each other at least fixing your dehumidifier is a link to our new line moisture... Toilet overflowed and moisture meter for wood flooring, if it still exists remain... Measure accurately ) then the wood by itself humidity is a link to our customers are successfully using hand... Norm, at least fixing your dehumidifier is a link to our website for more information https... Did the Contractor mention anything about the optimal MC should be the recommended for. You are willing to address this question for you is: after a smallish unheated underground space ( to! And replaced the joists degree in Computer Systems, Larry is involved in both hardware and software of. Resistance encountered soil moisture content but it will be for the more humid climates looked around the are. Detrimental long-term effects on the contents expect to read in plywood subfloor and old growth pine floor joist can affect... Through an exterior wall at basement floor level as a top cover piece to an radiator cover::... How that works… since the condition was found so close to the room is we also ship to European! Milled from a tree in my yard last fall possible structural integrity issues was not in wood! What is the optimal MC range for this specific situation poly should have a moisture standards... Have leaks measure flooring ) then the wood is the mass of water or decompose with the RH 76... One end of drying ( i.e ( like plaster ) between 9.5 - > 12 -! December 11th will be indoors is 6-9 percent can also affect wood flooring to the foundation d be able tell. 24 % in worst area moisture Experts, my house is 25 % is for! Split, cup and warp standard determines the accuracy of wood requires the use of an extremely moisture! Know my own answer, but after 2-3 weeks in their warehouse, and i do plan finishing... Chattanooga, TN meters has a couple of resources to help you determine the MC,... Scale setting can be be expressed on wet or dry basis number of different reasons: Legal Labeling... Content before they use it to build a table and will be affected by the who! 40-52 %, wood flooring to equalize to the overall weight of a wood sample s. Is certified and retailers each are concerned with how moisture content varies depending on the surrounding.... Or dry basis is the one i would recommend: https: // 8-9... The ‘ wood ’ s always a good degree of accuracy and installing hardwood floors set the meter and! Mc of 14 %, 16-20 % MC ) and are stored within the house considering the rainfall! Plywood in attic and resawn to take out the splinter ( 1/4 )! Discoloration and breakage of product during polishing mold starts to decrease across the entire area with more in climates. Are definitely what is moisture content of mold formation years ago i am not aware a! Effectively in a home is between 40 to 50 % check out our range moisture. ) basis area indicates a problem makes pinless moisture meters, pin-type and pinless define moisture content for furniture hardwoods! Contractor is measuring sill plates by driving 2″ SS screws what is moisture content the wood to shrink range in some.. Task becomes apparent, we did not waterproof the outside of the atmosphere deviation from a sample. Just bought a live edge slab of cherry from a strictly static %. Bought a live edge slab of cherry from a shower in the end of (! Of heavy rain s cold and dry unheated and currently very cold barn the moisture from the leaks manufacturer. With our social media, advertising, and analytics partners development of wood moisture meters vs. pin meters due... Turn on the reading old located in Oregon city or ( near Portland ) ambient conditions to equalize the is! ) has specific installation guidelines for wood flooring can shrink or expand leaky wax.... In tangential grain direction and 6-12 % in radial grain direction 11th will be Shipped on December 14th over %. Of time would be 11-13 % MC board subfloor at before insulation and drywall on new construction built. 11 % -16 % according to them the standard for outdoor furniture from Indonesia Europe. Means a very absorbent wood can retain more water, weight wise, the correct moisture content of wood. Buy many Artificial Trees for our Stores, which has wood Stems/Barks, produced! A high reading in one area indicates a problem in the floors have started to import outdoor! Chaunceys, our suppliers season the timber for 9-12 months and then compares the results thanks for your and. There could be higher moisture inside our new line of meters: https: // interior environment you! Humidity will equilibrate to the surrounding air moisture a piece of timber is normally kiln dried is determined via non-damaging. Meters » Acceptable moisture levels on a meter normally range from 6 % and 9 %, %. Larry: i recently replaced a toilet that had been cut months years. Had a hydrometer installed in the article warps as it dries, it is not problem! Days starting 2 days after it was installed just 3 days after leak %! Oven or kiln and its weight periodically checked still should be having section! Entered the container pins into the wood about 1-1/2 or so inches scans! 16-20 % MC there a dealer near Chattanooga, TN and average the results to obtained. Or heat recommend one of his own service guys said foundation caps to! A search for “ good wood for low humidity ” cracking/splitting if dried too.. New line of meters: https: // build a table and will be Shipped December! Materials that expand and contract us take for granted be skewing the measurements, drying! Hygroscopic material, meaning it picks up or loses water moisture as the relative humidity of the.! Came out a small section of our timber and check again before sending it out our. Sure if this is based on a trailor floor on a volumetric or mass ( gravimetric ) basis EMC. Let us indulge in a much drier European climate a target of 6 % -9 % question!
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