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What is an acceptable moisture reading for the different types of materials and surfaces? Observed water leaking along seams of several sheets of original plywood in attic. You also have the option to opt-out of these cookies. Hello Larry I am from Bangladesh. The engineered wood floor appears ok. thanks so much in advance. Do you have any recommendations on how to prevent mold from getting on the wood? The moisture reading scales are designed to determine a specific, quantitative amount of moisture content (%MC) in a particular type of material. As lumber dries, it may split, cup and warp. I suspect the screws may be skewing the measurements. Therefore, all wood moisture meters must be calibrated before use. Again, thank you for reaching out, we are always here to assist. If the conditions are too wet, dehumidify, and if they are too dry, humidify. Method 01: Use a Moisture Meter Step 1: Purchase a moisture meter. Hi Larry, We are a joinery company and we have a project here in UAE which is located in another part of the emirates and the humidity in that area is very high especially during summer because it is near the coastal area. After reading your article and following comments, my question is : How much does the finish of a wood project for indoor use affect the moisture content? The BD-2100's drywall moisture meter readings are accurate in gypsum to moisture content percentages as low as 0.2% and as high as 50%. I would think at least fixing your dehumidifier is a must. I recommend one of our Orion models: https://www.wagnermeters.com/moisture-meters/. I am extremely worried about this as we also found mold on his wood furniture but not on the walls. Free Download Is a Pin or Pinless Moisture Meter Best For You? The cookie is used to store the user consent for the cookies in the category "Performance". When questioned, he said because Room is under 200 sq feet it is not a problem. Instead, it just means that the moisture content of the material represents 20% of the reference scale. Having performed multiple (>500) soil moisture and density Sieve and Proctor, so I am well versed in moisture calculations (both add and subtract). Necessary cookies are absolutely essential for the website to function properly. In this article, we wanted to share whats out there on the web and other reliable sources about normal moisture meter readings. As it dries, you should expect slight changes in width and length. The same goes for wood, concrete, and plaster. We are trying to understand what happened & how to prevent it from happening with a new floor. I would think it would vary depending on the contents. Additionally, some meters also offer a third scale for readings of gypsum. The moisture content typically ranges from 6-8% for hardwood floors. Moisture meters are subject to false positive readings for a number of reasons that are well documented in the industry. Indoor humidity levels should be between 30% to 50%, with the ideal level being about 45%. Perhaps reach out and contact me directly as your time allows: 1-800-634-9961 ext 212. 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. Currently the RH is 76%, the residence RH will be set at around 35%. Thanks for the question. The reference scale helps to provide a qualitative estimation of moisture across different types of materials. Why You Should Use Relative Humidity (RH) Testing, Flooring, Millwork, Furniture & Cabinet Manufacturers, How to Choose a Moisture Measurement System for Your Sawmill Buying Guide. This website uses cookies to improve your experience while you navigate through the website. Because wood shrinks and warps as it dries, woodworkers want it to be pre-shrunk before they use it. Failure to account for temperature variations and a woods chemical makeup will reduce the accuracy of even the best pin-type moisture meters. This is the standard in the construction industry. Therefore, in order to avoid post-construction problems, a woodworker building a cabinet for this particular interior environment would need to dry his wood to a moisture content of 8- 9% beforehand and then keep it that dry during the construction process. When it comes to the moisture content of plywood or dimensional lumber, an MC of 17% to 19% reduces the overall strength of plywood, and an MC of 20% or more reduces the strength of dimensional lumber (i.e., lumber cut to certain predefined sizes, such as 2x4s). For many industries, its very necessary to determine moisture content. You might think that the 1% shrinkage caused by a 4% change in moisture content isnt that much. A normal moisture meter reading on wood ranges between 6% and 10%. This would depend on the expectations of the person receiving the product in India, how large of diameter the logs are, and some average estimate of what the conditions would be inside the container during the 55 days. They are in an unheated and currently very cold barn The moisture ranges from 11% -16% according to my meter. This article is really helpful. A moisture content reading of 25% is borderline to support mold. Wood is used to clean model railroad tracks. It comes with Bluetooth, an app for your smart device, an RH sensor, and an EMC calculator. 10 14% moisture content is too high. As Sales Manager for Wagner Meters, Ron has more than 35 years of experience with instrumentation and measurement systems in different industries. Typical moisture content for furniture in a home is 6-9%. Record the reading you get and use this as a baseline. Also, the glue manufacturer should ideally give you some specifications for max and min moisture content. The acceptable moisture content in wood depends on two factors: These two factors make it difficult to say anything specific about acceptable wood moisture content. Additionally, for wood moisture meters, its important to check if there is a species correction feature for the meter. I had engineered hard wood installed and it is curling at the joints. There are two main types of wood moisture meters, pin-type and pinless. It is best to allow the wood to equilibrate to the room environment. Do these levels seen appropriate considering the recent rainfall. The purpose of acclimating is to allow the flooring to equalize to the surrounding conditions, no matter how large the room is. Failure to do this will result in warping, cracking, and other problems after the construction of the wood product. This range allows you to measure the moisture content of nearly every currently known wood species, including softwoods and temperate and tropical hardwoods. I am shipping teakwood furniture from Indonesia to California. The other question is what should the moisture content be on treated lumber that will be for the framing of the deck? With pin meters, the standing water on the top of a piece of wood can cause the electrical current to be routed through the water instead of the material being tested. However, even with large moisture changes, wood barely shrinks or expands at all along the grain. 541-582-0541 or from North America, 800-634-9961. However, this time I was planning to use oil based poly rather than the spar urethane to reduce the amount of yellowing. Thank You. Subsequently the woodgrain has reflected in the previously mirror-finish, only on the new panels and we suspect moisture content issues in the wood before it was varnished. We will be building fir windows. The boards have dried nicely so far with minimal warpage or checking. Well, tile, bricks, and stones are known to have a low water-holding capacity and therefore should be dry. You may be picking up something behind the sheetrock. There are different methods for determining moisture content, and among them, using a moisture meter is the most popular way. Mansel, I would just keep an eye out for now. So, when testing different building materials, its important to check for these kinds of flaws. Mandi, I recommend you contact the National Wood Flooring Association (NWFA) in St. Louis. The BD-2100's drywall moisture meter readings are accurate in gypsum to moisture content percentages as low as 0.2% and as high as 50%. Discolored areas or crumbling patches are tell-tale indicators that the wall has been exposed to too much humidity. 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. That said, I would be curious what meter you are using to get the 30% reading? Thank you. Look for a device that has features such as a digital display, adjustable measuring range, and user-friendly operation. It is possible, in some species, to have a moisture content higher than 100 percent. They are returning to remove one plank and take it back to see what they can do to meet my satisfaction. on Feb 13, 2019 12:44:17 PM. My plan is to make a wall-mounted headboard out of angle iron and these boards (boards will not be joined). Being that we live in Central Florida, 40 miles North of Tampa and using this chart page 5 ( https://research.cnr.ncsu.edu/blogs/wpe/files/2016/08/Equilibrium-Moisture-Content-of-Exterior-Wood-in-the-US.pdf) were it states EMC for wood exposed outside for our area of 12.5 to 14.0 when I put the moisture meter to the wood it should be in those ranges if going to be used outside? Do you think that heated floor actually help to dry or do they make things worse and more humid! 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. Both times, the tables were flawless, but after 2-3 weeks in their new home both table tops had major crack issues. Put differently, if the reference scale shows a reading of 20%, it does not mean that 20% of the dry weight of the tested material is water. Your subfloor moisture level should be no greater than seven to nine percent when you are installing flooring. The more common situation involves any one of the core materials with high moisture readings but no degradation. Therefore, just because the wood is kiln-dried doesnt mean it has lost the ability to absorb moisture. He, of course, said that type of product is insufficient. Part of knowing how to understand moisture meter readings to get accurate results is understanding the capabilities of the meter itself and ensuring the meter is in the correct reading mode. Americas Leading Water Damage Restoration & Mold Remediation Company. The optimal humidity in a home is generally 35%-55% and anything under 20% is actually considered unhealthy, as it dries out the skin. The same study showed a 40% loss in joint strength and concluded that a 20% MC may significantly compromise shear resistance of exterior walls. My thought is maybe to get one of your meter for greater accuracy? The floor (under carpet) had long-term water exposure supposedly from a shower in the adjacent bathroom (according to the plumber). Therefore, they need to be set to the proper wood density before taking a moisture reading. It is important to have the same temperature and humidity during those 2 weeks that will be maintained after installation. Good moisture content for softwoods is 10% to 14% moisture. An important factor to consider when using a moisture meter is the amount of moisture on the surface to be tested. For this purpose, the paper scale is used. If youre willing to accept a moisture reading with +/- 5% accuracy, you can probably get away with buying a cheap meter in the $25-50 range. The relative humidity of the concrete is then tested over the course of 72 hours. Three years ago, the floor sank in a heavy traffic area and an engineer told me Masonite was used to shim and had compressed. I really appreciate your treatise on this matter. 1. in Indonesia there are a lot of raw materials consisting of natural fibers, such as: pandanus, water hyacinth, rattan etc. If the wood is covered by a material like MDF or other, do we take 2x the measurements? We also ship to other European countries, for dryer country like Spain the EMC could be between 12 and 14. It can even cause warping and cracks in the finish. Therefore, all pin-type wood moisture meters should ask the user to input the type of wood before taking a reading. It is best to obtain a wood moisture content that will match the environment. So if theyre worth it to you will depend on how serious you are about soil moisture. In other words, wood in interior locations will equilibrate in this range. Ideally Ill wait until reaching final drying but sometimes I need to use wood before that point. This cookie is set by GDPR Cookie Consent plugin. In the Midwest, the EMC of wood or lumber in Des Moines, Iowa, ranges from 12.4% to 14.9%. Are the measurements of all wood the same? Tom Laurenzi i did not waterproof the outside of the curb (kerdi), so the wood got wet. Outside of these ranges, hardwood floors might start . Because of this fact, its important to test the accuracy of a moisture meter before putting it to use. Furniture maker Lonnie Bird weighs in, I dont want the wood to shrink after I use it because the wood will warp or split.. You are correct, furniture grade hardwood is typically dried between 6 to 9%. if a reading of 30% in engineered wood should it be replaced possible mold ? (The EMC of air is equal to the moisture content the wood will attain when stored indefinitely at a particular humidity level. Toilet overflowed and moisture meter is reading 30% in worst area. These cookies track visitors across websites and collect information to provide customized ads. To determine if your hardwood floors need to be acclimated, you can use a wood floor moisture test. There will be statistical outliers on both the low and the high end and youll want to catch these by using a quality moisture meter. I believe you are asking for the percent moisture content (humidity) of South African woods. Although some movement can be expected between 6% and 9%, wood flooring can shrink or swell more dramatically outside this range. My meter tells me anything above 12% is wet but I cannot find any source of leaking or signs of water. A moisture meter will help verify. This summer I milled several 1.25 boards from a fir log that had been cut around 10 years ago. In their warehouse, and perhaps partly also in the container. The chart below will clear things up. Most types of wood species will mold above 25% moisture content, including pine. A normal moisture meter reading on wood ranges between 6 and 10%. Is it possible the 40% moisture is not the cause of the mold or is it the most likely suspect? Thanks!!! I love trying out new equipment, and together with my team I've been creating in-depth blog articles since 2016 to help loyal readers with tools & crafting tips. Broken or rusted contact pins might not conduct electricity as readilyincreasing resistance so materials read as being drier than they actually are. I built the tables in west Texas, but their final home is in Colorado. Timber logs & Lumber into India company remained actively involved in harvesting and sale of Hardwood logs of Indian origin. For paper manufacturers, determining the moisture content is very necessary to produce papers of good quality. For example, if the moisture content of the delivered wood is 12% and the optimal MC is 6%, then physical problems will occur during the acclimation process. What % does it have to get down to before it would be usable to make a table top ? In general, a moisture value of 0-15% is not a reason for alarm. Here is the one I would recommend: https://www.wagnermeters.com/shop/mmc220-extended-range-moisture-meter/, My potential house in North Carolina Fayetteville area was just checked for moisture content in the crawl space. This throws off the moisture readings accuracy. Normal readings measure between 7 and 13 percent moisture. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. If an interior location has an average RH of 40-52%, wood placed there will have an average EMC of 8-9%. The shipping time is approximately 45 day in a 40 container to the west coast . Levels between 25-30% indicate that there may be water ingress, meaning that remedial work could be required. Fill the. However, a low-end moisture meter can be wildly inaccurate. This means a very absorbent wood can retain more water, weight wise, the weight of the wood itself. Readings can be elevated if there is a stud directly behind the sheetrock. Prepare a set number of holes to a depth of 40% of the slab's thicknessat least three holes for the first 1,000 sq. What is the SG setting? Outdoor temp is 99*F. Is this normal? Instead, these are just estimates where high values mean high moisture levels and low values mean low moisture levels. Two weeks is sufficient for softwood. The interior home conditions are, AC running at 68-70*F. Exterior wall condition 104*F as checked with an IR thermometer of East wall not in the sun. ft. of concrete, and another hole for each additional 1,000 sq. I live on the fl coast so what should the moisture level be? With this information, the software in the meter is . With furniture or cabinets, a 1% shrinking or swelling can result in poor-fitting drawers, doors, and joints. Thanks Mark, The EMC outside and the wood should be the same. Designed by Damp Solving -Water Damage Restoration & Mold Remediation Services 1995-2023 All Rights Reserved. This will hopefully save you lots of time searching different resources and tell you what values require intervention in order to stop dampness from spreading before it becomes challenging and incurable. Any input would be most appreciated. I requested the treated lumber be brought in a few weeks prior to build, stickered and put under cover to acclimate and dry it. (He didnt cite a figure.) Pin-type moisture meters are also sensitive to the chemical makeup of wood, which varies from species to species.

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