To establish a baseline for wood flooring acclimation, the installer will need to calculate the optimal moisture level of the wood by dividing the regions high season and low season EMC. my question is, is there a possibility that the wood will shrink because of the weather condition?the wood that we used for the door frames and bidding is beechwood. Great info! We just had a hydrometer installed in the crawlspace and it is reading 38% as of today. On a hot, humid summer day, the air venting into the crawl space could be as much as 75% relative humidity and 85 degrees. Knowing were all the piers are, I can stand on top and feel a small hump in the floors. Will your meters work to find MC levels for composites? You will also see that the healthy wood moisture levels of 10% - 16% occur when the relative humidity is between 55% and 80% at 70 degrees. Two weeks is sufficient for softwood. P.O. An MC in this range, therefore, is considered sufficiently dry for exterior in-service wood. He, of course, said that type of product is insufficient. The cedar I have is now at 12-16%. Is this accurate? Studies have shown, however, that mold growth can occur on wood at moisture content levels above 15 to 18 percent, and corrosion of metal fasteners in treated wood can occur when moisture content exceeds 18 to 20 percent. Any moisture content measured higher than that might result in movement, such as warping and twisting, once it dries. Hello Enjoyed the article. Typically, allow about 3 weeks for hardwood to acclimate in the environment. Drying teak hardwood from a humid climate, for use outdoors in a much drier European climate? I would also consider the environment where the table will live. The process is time-consuming but produces accurate results if followed correctly. I suspect the screws may be skewing the measurements. I have removed the 1 3/4 edge and resawn to take out the splinter (1/4) re bicuited . 2. A moisture meter will help verify. I cant speak for the home inspector who has raised concerns, or what his experience level is, but I can assure you that the floor joists beneath this home are no different than 90% of the floor joists I have inspected over the past three decades. In your blog I read that furniture for outdoor is dried to a MC between 9 and 14%. Thank you, In wood products manufacturing, 6-8% is pretty much the norm, at least in North America. These are typical readings for exterior wood. I hope this helps. Larry Loffer is a senior technician at Wagner Meters, where he has over 30 years of experience in wood moisture measurement. What is the optimal MC of the fir stock for construction of the windows? 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. Hi Davetta, Youll need to contact a local mold inspection company that is certified. Wood is hygroscopic. I have a question. The excess moisture source should be corrected if found. We appreciate you writing in, best of luck! Call 256-318-0982 or contact us today. Spruce isnt a hardwood so Im assuming I could get away with a shorter dry time. You wrote that 15% humidity may induce mold? Many timber-framed floor problems can be traced to moisture levels, excessive loads or borer. Its never constant. Floor joists are generally 6, 8, 10, or 12 inches in width, with 8 or 10 inches as the most common sizes. h26P0Pw/+Q0L)66 Then placing his pin meter on the screws. Chris. The ideal moisture content will depend on the humidity indoors. I recommend one of our Orion models: https://www.wagnermeters.com/moisture-meters/. The new wood was brought in in bundles ~2 x 2 x 6 and left that way to acclimate for ~2 weeks. And would it be normal for the MC to vary from board-to-board and one end of a board to the other? So, when looking at the relative humidity of the space, spaces left above 70% RH for extended periods will also promote mold growth. The thinner veneers wont have much bearing on the reading. Well, tile, bricks, and stones are known to have a low water-holding capacity and therefore should be dry. With a concrete subfloor you should use a digital hygrometer, which needs to be left in place for at least 24 hours. It is a 2-3 feet wide wet area that drains to a line connected to the city system. The supplier says they dry the wood to an MC of 14%, which is according to them the standard for outdoor furniture. Simply put, the post offers some useful information. The plumber said that the floor has an elevated moisture reading and took a photo showing the 99.9% (maximum reading) on the meter while the meter was on the floor. Hi Moisture Experts, My house is 25 years old located in Oregon City OR (near Portland). Room size, L-shaped, is 21.5 x 12.5 and leg of L is 8.5 x 11. I have come across this and havent made the purchase from my friend because I am not sure about the warp or breaking it will come. I have about 3,000 sqft on my first floor and this was relatively consistent throughout. guide-standards-tolerances.pdf. If after the inspection we find that your sagging floor joists need support or your home's foundation needs repair we may recommend using IntelliJack, JES Helical Piers, or JES Push Piers. Just across the threshold to a white oak floor installed in ~1914 and the MC is 15%->16%. Perhaps there is something different about the East and West walls. The floors have started cupping across the entire area with more in some parts. I live in Atascadero CA and had a coastal red oak tree cut down this past summer. Too wet and you get fuzzing. h_k0 r ?c|@+wpF=M^r? ( BzPxgA9P{j]s 3r\WQu\@U.Jy'h{>dccy. The failure in your case sounds as though the piece was exposed to a rapid loss of already low ambient moisture, causing the cracking in the piece. 24 and 26 framing studs should measure 19% moisture content or less. It seems to me the supplier is drying the Teak to 14% because that is what is needed in Indonesia. The excess moisture source must be immediately corrected, and the situation carefully monitored until the WMC returns to the 12-16 range. Also, if the leak was bad enough, it will be necessary to have a contractor make sure the strength of the subfloor isnt compromised. I have a couple questions. Step 1: Check the Floor. The EMC of wood or lumber exposed to an outdoor atmosphere varies across the U.S. For instance, in the coastal city of Seattle, the EMC of wood or lumber is higher than the EMC of cities inland or in the Southwest. Retain this information with your records. the concrete was completely dry, no standing water. Should I wait for the slabs to be within that 6-9% to cut and glue? A mold or mildew odor or appearance on surfaces. The substructure may show decayed areas, ranging from small to very large, of rotten floor joist, sills, and . Softwoods, such as spruce, can have more moisture. Many thanks for your advice, really appreciate it! This document describes the meaning and use of readings from a wood moisture meter. To achieve this, Acceptable Solution E2/AS1 says that, on near-level sites, the floor level must be no less than 150 mm above the crown of the road or the lowest point of the boundary. SE, Huntsville, AL 35802. Ideally, it should be between 7% and 9%. We havent gone any further since the condition was found so close to us purchasing the home. Hug the ones you love when you see them! In other words, the water weighs more than the wood fibers. I appreciate you sharing this important information with us at this time. 12% is good for softwoods, but again, it depends on the relative humidity and temperature where the finished product will be kept. within two percentage points of the EMC where the wood is going to be used. Alternatively, you could set up a crawl space dehumidifier and draw the . Using a moisture meter before painting can help you determine the moisture content of the wood. I live in coastal South Carolina .we are definitely afraid of mold formation. It will be there for a few months before I begin working on it. 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, Acceptable Moisture Levels in Wood Knowing the Moisture Content, Free Download 5 Ways Pinless Moisture Meters Save You Time and Money. Sorry, that time of year. From a strictly static MC%, 16-20% MC for long duration is going to promote mold growth. As the humidity increases, the MC increases, causing the wood to expand. Your email address will not be published. Once wood is dried below about 28% WMC, water is not available to support decay, unless the wood is exposed to liquid water. I live in michigan (humid summer, long cold winter). I understand that a home inspector expressed concern about fungal growth on the floor framing, so the buyer is concerned that the fungus needs to be removed/cleaned/mitigated from the joists. Over a year ago, I re-shim all the piers with metal shims. Doesnt sound like this has been a problem in the past. can be insulated and heated (insulation is mandatory if heated) require careful planning and . /U (li7":-JOBHO,9UY) /P 65492 >> endobj 14 0 obj << /S /GoTo /D [ 15 0 R /Fit ] >> endobj 27 0 obj << /S 45 /T 91 /Filter /FlateDecode /Length 28 0 R >> stream Make sure theyre aligned with the grain and not across it. Are the measurements of all wood the same? 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? If this is confusing, dont worry. Yes, our moisture meters read MDF. Which Orion moisture meter model would you suggest for my application? The difference between the wood subfloor and the hardwood flooring shouldn't exceed 4% for solid strip hardwood . Below a 17% MC of wood, virtually no microbial growth will occur on even the most susceptible materials. Very educational! To do so: Make two vertical cuts through the joist a safe distance away from each end of the rotten section. Did the Contractor mention anything about the structural strength of the joists? We also have an Orion 950 moisture meter that will automatically give you EMC (Equilibrium Moisture Content) and other useful statistics. This chart highlights the ideal levels of moisture in wood at various temperatures and relative humidity (RH) levels: In this chart, you can see a small highlighted section. Use a wet/dry shop vacuum, sump pump, or rags to clean up standing water or excess moisture from the floor and from the surface of the wood. moisture will typically measure 7-10%. The company they hired measured 47% in the wood and declares that this must be ripped out and replaced. Replaced the subfloor, which is . Good luck. "R. The door is NE facing and protected from direct Sun light and rain by a porch roof. I want to use it to build a table and will be moving it to the location where I will work on it shortly. endstream endobj 79 0 obj <>stream Wood is a hygroscopic material, meaning it picks up or loses moisture based on the ambient conditions. This type of floor-leveling is DIY-friendly and costs approximately $1.50 per square foot when applied 1/8-inch thick. While oven-dry testing, if followed correctly, offers accurate results, there are a few drawbacks: These three drawbacks mean that oven-dry testing usually isnt the option of choice for hobbyists who work with wood. Does Brick Veneer Cracking Mean Foundation Problems? After my inspection I wrote the following report: As per your request, I visited the subject residence today to evaluate mold or fungus growth on the floor joists. While the surface of the floor might feel dry, there could be higher moisture inside. I checked it with my new moisture meter and had a reading of between 8-13.5%. Elaine. can be laid with falls and set downs. The electrical current will then move from pin to pin and measure the resistance encountered. I am based in The Netherlands. Different wood? Copyright - RLC Engineering, LLC. All Rights Reserved. Engineering & Inspection Services, Licensed PE - Alabama & Tennessee, JADE Engineering & Inspection | 5405 Whitesburg Dr. We dont know if we still should be having a commercial drying process? Post and beam constructions don't have to be kiln-dried but should be air-dried. we are getting hardwoods from our Uk Suppliers and accoya coming in at 2% and once we use the timber we are reading 0% we have tested the reader and its accurate even joinery grade sapele wood and Tulip wood coming in at 0% we cover these in 3 coats of sikkens paint and sometimes we get jobs where we are having to go back as our joinery is moving and we are guessing its because of these moisture levels and had never checked previously. Would you be able to say anything about the optimal MC range for this specific situation? : Mold & Fungus In the Crawlspace. Its always a good idea to check with the manufacturer of the finish also. Phil, what are you making with the cedar, and in what type of environment will it be? Any opinions. The fastest way to test the moisture content of wood is to use a moisture meter. My first question is how to determine the MC of eng wood flooring which composite of different species layer, face and different species to form plywood core. Wood is used to clean model railroad tracks. Decay fungi need liquid water to grow. The next question is almost the same as before, if we have various kinds of wood, such as March wood, mango wood, pine. Turn on the meter. 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. When exposed to a constant RH, the moisture content of wood or lumber will come to equilibrium with its environment, resulting in an EMC for that species of a wood-based composite. The average RH of the environment where the wood will be used. The wood has been kiln dried and packed in corrugate. Best, Kyle. The lumber was recently milled, although the tree had been cut months, years ago. Whether youre a woodworker making cabinets, a wood flooring professional installing hardwood floors, or if you use wood in construction, wood moisture content (MC) should be always on your mind. Were looking to replace the floor in an old (unheated) hay barn with treated tongue & Groove 26 flooring and need to know if the advertised 19% MC will be ok and not shrink too much. 11 0 obj << /Linearized 1 /O 15 /H [ 1017 209 ] /L 26721 /E 14333 /N 2 /T 26383 >> endobj xref 11 18 0000000016 00000 n 0000000724 00000 n 0000000820 00000 n 0000000963 00000 n 0000001226 00000 n 0000001393 00000 n 0000001566 00000 n 0000001771 00000 n 0000002827 00000 n 0000002934 00000 n 0000004271 00000 n 0000005322 00000 n 0000005517 00000 n 0000007871 00000 n 0000007949 00000 n 0000009756 00000 n 0000001017 00000 n 0000001206 00000 n trailer << /Size 29 /Info 10 0 R /Encrypt 13 0 R /Root 12 0 R /Prev 26373 /ID[<2277e06d91c56aa37caf41071ab29f47><2277e06d91c56aa37caf41071ab29f47>] >> startxref 0 %%EOF 12 0 obj << /Type /Catalog /Pages 9 0 R /PageMode /UseThumbs /OpenAction 14 0 R >> endobj 13 0 obj << /Filter /Standard /V 1 /R 2 /O (D+K\r,s\n?$+%{Nhjp-!) The joists can be longer or shorter as required by space and size, and are typically spaced at either 450mm or 600mm apart. I have 1 1/2 thick cherry boards that I had milled from a tree in my yard last fall. However, and unless otherwise permitted by a flooring product manufacturer, the following maximum moisture emission levels over a 24 hour period are permissible for the following floor coverings types: Soil is almost always damp. This means a very absorbent wood can retain more water, weight wise, the weight of the wood itself. The engineered wood floor appears ok. Eventually, this internal moisture will evaporate by itself. >V@Ica4R%f%l&/R*liDqx/nB*?1MH}Su>VeyZ3?>vMLqcwY^U. I would like to rip two slabs and glue them together to make a nice large dining room table. 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. The joist span tables start with 26 lumber and it goes all the way up to 212. My question for you is, now that it is stained, can I still get an accurate MC? A consistent humidity level of 70 percent will require wood to be about 13 percent moisture content. Concrete floors. This will stop the wet/dry cycle that exists every year, in every ventilated crawl space containing A/C ductwork in the SE United States, over their lifetime. I live in upstate South Carolina. i dont understand how the bottom beam looks like swiss cheese from all the holes ive drilled and has had a commercial blower on it for days yet the number is still high despite there being no visible water to keep the wood wet. Ev I have an unusual question, if I was to sandwich recycled paper (similar to hardwood floor paper only heavier) between 2 layers of wood as a draft stop what should the moisture content be to avoid the paper absorbing any water and ending up with a mold issue thanks in advance for any info you can provide. Either one should be acceptable for finishes. Outdoor temp is 99*F. Is this normal? I have a black walnut slabbed up that has been air drying outside for 2 yrs. (Itd effectively seal the cavity under the vanity, so once the trim is back on, i dont think itll dry out much more.) Hello! Squeaks from subfloors The floor installer is often the 'first cab off the rank' when there is a squeaking floor and the problem may Lay the panels perpendicular to floor joists, allowing 1/4 inch of space between panels and the wall. A consistent humidity level of 40 percent will require wood to be about 8 percent moisture content. As with the hardwood flooring, it is essential to check the OSB's moisture content using a moisture meter. During the summer months, when outdoor humidity is high, the hot/humid air enters the crawl space through the foundation vents and condenses on cool objects. Thank you for the information, I use a lot of trimmed for for children toys, menu times I use rings of 1-3 inch in diameter, For these purposes I dont care for wood shrinkage or wraping, Two things are important for me that wood will not crack, and that mold wont develop. I suggested replacing my dehumidifier (Sears brand, bucket collection) which has been inoperable this past year. Surface molds may develop. And it's important to keep in mind that a glued-up panel behaves basically as one wide piece of lumber. Typical humidity levels inside a home is between 40 to 50%. The three main sources of moisture: Condensation, Foundation wall transfer, and leaks. I am presently drying it to around 8%-10% and then rotary polishing it, but I am facing the issue of burrs on the edges. I dialed the 800 number for Wagner meters and all I got was two sales pitches for a Life alert type device. Stopping the moisture is much cheaper and easier than repairing the structure. What would one expect to read in plywood subfloor and old growth pine floor joist? Good luck. We dont know if we still have leaks? My question is microwaving twice turned bowls what would be the general rule of thumb for a target by weight. If the MC of plywood is above 20%, can it be redried in a kiln or would that harm the glue? i cored out a small section of the bottom beam (3 inches wide) all the way down to the foundation. Its still there and causing stains and scaring inexperienced home inspectors who frighten buyers, but its dormant. Although, in this example, the moisture content of the timber rarely goes above 17%, it is not uncommon for winter moisture contents, in pitched roofs, to peak above 25%. The house was not in the flood area however they did receive 20 inches of rain. They are in an unheated and currently very cold barn The moisture ranges from 11% -16% according to my meter. provide a good substrate for a wide range of wet area finishes. Before installing plywood underlayment, ensure that the existing flooring is thoroughly vacuumed, free from debris, and stripped of wax. What is the acceptable water/moisture content in cassia bark?- in south east asia. There is over three foot of block above grade around the entire house. I strongly recommend using a moisture meter, along with a thermo-hygrometer, or even a smart logger before you start building, to ensure the wood is at an optimal moisture content in an environment that has an acceptable relative humidity and temperature range. This is a perfectly normal moisture content and one that will not support fungal growth. Normal moisture content of wood ranges from 7% to 19%. Mold growth can be limited if the MC of wood can be kept below 20%. Since wood is hygroscopic, it loses or gains moisture depending on the relative humidity of the surrounding air. Remove Moisture From The Air - If your crawl space has a lot of ventilation, you should be able to set up a large fan in the opening of the crawl space and leave it to run for 10 to 12 hours. If a board reads 100% (Difficult to measure accurately) then the weight of the water equals the weight of that wood. Next, check the moisture of new floorboards. This site uses Akismet to reduce spam. Treated wood is typically still wet when its delivered to the job site. Some of the unfinished wood you see on the market has been kiln-dried to reduce its water moisture content to around 8% so that it wont suffer from moisture-related defects like warping and buckling. Below 12% Readings in this range are common to kiln or oven dried woods and furniture grades of wood, and represent dry conditions. You can determine the correct percent moisture content by using our free app called WoodH2O. Hi and good day , I would like to find out what r the right temperature readings for workable wood slabs in South Africa specially Matumi wood slabs. The interior was 3/4 BW the tables dimensions were 40x 70 . Truss Uplift: Who Would Have Ever Thunk It? . Thank you. The wood looks awful, and the staining the did is even worse. These varying humidity levels of the surrounding air cause wood to not only gain or lose water moisture but to expand or shrink as well. Its mc is 11- 12% . The Building Code states that houses must be built so that a 50-year flood will not enter the building. ft., and averaging the results. Wood freshly cut or kiln-dried is always interacting with environmental moisture. Based on common guidelines or recommendations, the acceptable moisture levels for wood are as follows: Keep in mind that a woods acceptable moisture level will depend primarily on how it will be finally used and the average RH where it will be finally used. If decay or WMC readings over 28% are present, find and fix the sources of liquid water quickly. Hello, Paul here. Signs Of Moisture In Basement. The chart below will clear things up. Ive been following your in depth blog on moisture meters for around 1 year now. The same study showed a 40% loss in joint strength and concluded that a 20% MC may significantly compromise shear resistance of exterior walls. Including some high-end species like Rosewood, ebony, Mahogany, White Cedar, Bija Sal, Walnut, Gmelina, etc. Lacquer will not make a reading difference as long as there are no metallic components in the lacquer itself. However, kiln drying is used to speed up the process. With a Wagner L606, I am getting MC readings 12%->15.5% . Where are you located? So the question is are those burrs or fuzzing on the edges?, Wed love to have you give us a call to discuss which moisture meter is best for you. However, many building materials may have been dried down to about 15% moisture content. If possible, keep indoor humidity below 60 percent (ideally between 30 and 50 percent) relative humidity. He wants to install his companys system, seal all external openings around connections, etc. They are currently nearing equilibrium (around 12 MC) and are stored within the house. Water Level Survey: Are You Smarter Than an Egyptian? This must be done before attempting to dry out the wood. Moisture contents of 12 to 17% is ok. You dont want to see any subfloor reach about 25% which is where mold will start to grow. Other signs of high moisture readings include surface mold, evidence of water flows in the crawl space, evidence of water stains or evaporation from foundation walls and columns, evidence of condensation on ducts and evidence of water drops impacting the soil under ducts. 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. Timber framing needs to be dried to acceptable moisture content levels as stipulated in NZS 3602:2003 Timber and wood-based products for use in building. Have I been wrong? I was able to get the MC down to 15%. We just bought a home where we discovered the plumbing was leaking over a number years with a kitchen flood occurring in the last 3-5 years due to a busted water line. 9Chrv;plt[nh%:fOl8e^5e cM(?=6?y8{6uZkpz[TgLXD9feUm.L;l7:5C:hf=tE&U[&8 ^ wu*Vz*##;PKk? They are now saying that they will replace whatever boards are bad and resand and finish the floors, however Im concerned that there is an underlying issue that will resurface here? It does the same for wood, and is especially hard on softwoods, such as pine or fir. So, to sum up, Moisture in crawlspaces is bad. Many of our customers are successfully using our hand held moisture meters on engineered flooring. Cheers, Howard Pruden in Edmonton, Alberta where its cold and dry. However, it Wonder if they are trying to cover themselves. ( 55 days transit by sea) What should be the moisture content while loading in Containers? One of our new line of moisture meters will help locate areas of high moisture, if it still exists. The fir windows and exterior doors will be affected by the the exterior and interior RH. look forward to your comments. Substrates must be protected by: The ASTM D4442 standard determines the accuracy of wood moisture meters. It is not fair to ask the seller of this home to pay some pest control firm to spray Borate on the floor system. You can check for moisture by using a moisture meter. They are putting desiccants in the container to absorb the moisture but we feel its going to be a long time enclosed in the container without any air circulation. I wanted to talk to someone at Wagner about moisture guages and is there a dealer near Chattanooga, TN. I have seen home built in the dead of winter, covered in snow, and still dry out enough for a successful home build. What can we do to get the row products closer in moisture content, we are currently using fans, We are in northern lower Michigan I am the general contractor for the house, and want to avoid any problems, would love to talk to you on the phone, my number is 9894647248, Mark Skiba, This is a great site about moisture content. 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 average annual relative humidity will play the biggest role in determining what the optimal MC should be. The EMC in the recommended temperature/humidity range coincides with the 6% to 9% range used by most flooring manufacturers during the manufacturing and shipping process. Its not growing or feeding on the wood. 17 and the flooring is at 6 to 7. Every home's foundation repair needs are different based on soil type, type of foundation problem, and climate. Timber logs & Lumber into India company remained actively involved in harvesting and sale of Hardwood logs of Indian origin. I manufacture ice cream sticks and disposable wooden cutlery from European Baltic birch wood in India. 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). 10 14% moisture content is too high. You can use our free APP called WoodH2O to help you decide on the best moisture content. Let's repeat that again. Be sure to acclimate the wood to desired EMC of the interior environment before you use it. The normal moisture content of wood (or EMC) varies from 7%-19% depending on the RH in the air. Im down to ~13-19% MC near floor level, based on a cheapo moisture meters readings. The reading was sky high in the pan and up two tiles high on the wall. Call JADE today for a crawlspace inspection and we can give you definitive answers to your crawl space problems! One type of wood moisture meter. Moisture content (MC) in raw slabs can take additional time to reach its Equilibrium Moisture Content. We really cant overstress the importance of taking plenty of moisture readings. My meter tells me anything above 12% is wet but I cannot find any source of leaking or signs of water. 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