acceptable moisture levels in floor joists

The moisture content overall is almost always below 20%. We dont know if we still have leaks? However, this range will vary slightly according to the geographic region because of varying RH levels. Limit the length of notches to 1/3 of the joist's depth. Wonder if they are trying to cover themselves. 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. Any input would be most appreciated. We had boards that were also cracking/splitting and other places where small pinholes were showing up. I live in upstate South Carolina. summary Acceptable wood moisture readings on a meter normally range from 6% to 8% for woodworking. What is the optimal MC of the fir stock for construction of the windows? I have been testing the bottom stud/sill board of an exterior wall on a slab of an old house that exposed in order to put a floor in. The door is NE facing and protected from direct Sun light and rain by a porch roof. They are in an unheated and currently very cold barn The moisture ranges from 11% -16% according to my meter. Lower differential means slower heat loss. i want to make a headboard from it. 800-347-7260 Fax. Im looking for the % number that will be my upper boundary for oil application Would 12% be ok? I am shipping teakwood furniture from Indonesia to California. 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. I hope that helps. Typical moisture content for furniture in a home is 6-9%. It is also possible high moisture has entered the container during the trip to Europe. Should it be less? -XF% We have had on/off rain and humidity 80-90% range. Back to top. We have a free App called WoodH2O that will tell you the moisture content given certain temperature and humidity conditions. Here is a link to our website for more information: https://www.wagnermeters.com/shop/orion-950-smart/. A consistent humidity level of 40 percent will require wood to be about 8 percent moisture content. A consistent humidity level of 70 percent will require wood to be about 13 percent moisture content. hellow! Would you be able to say anything about the optimal MC range for this specific situation? Perhaps there is something different about the East and West walls. Even with lower temperatures, the ideal range for wood keeps relative humidity between 55% and 75%. info@rlcengineering.com 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. I checked it with my new moisture meter and had a reading of between 8-13.5%. I had a pin meter but found I had to put the pins in the ends or try to find an area that wouldnt be seen, so Im thinking a pinless might be better. Turn on the meter. Hug the ones you love when you see them! Finally the question I have is I-used your Wood H2O app and the humidity here (outside) is 55% and the temperature is near 70 (inside)am I correct that 10% is what Is the acceptable moisture of the wood should be for furniture building? Hi Larry, So a friend of mine has some pine and oak blabs at MC levels of (oak 11.5%) and Pine 13-14%. Would it still be 9% for pressure treated wood? Your help for resolving this issue would be highly appreciated . Do you have a suggestion? Do these levels seen appropriate considering the recent rainfall. In their warehouse, and perhaps partly also in the container. can be laid with falls and set downs. This is based on a chart in Wood Handbook: Wood as an Engineering Material. This will drastically speed up the drying process. My question for you is, now that it is stained, can I still get an accurate MC? Hardwood flooring needs to acclimate at least 2 weeks, in service conditions, before it is installed. I appreciate you sharing this important information with us at this time. The air vents stay closed year round. Different wood? I removed an of the foam insulation. Wood shrinks or swells as its moisture content changes, but only when water is taken up or given off from the cell walls. Wood is used to clean model railroad tracks. The pins are pressed into the wood to obtain a reading. The excess moisture source should be corrected immediately, and monitored until the WMC returns to the 12-16 range. It depends on the size of the project, but anytime you put a waterborne urethane on the wood you are adding moisture to your project. A moisture content reading of 25% is borderline to support mold. You can use our free APP called WoodH2O to help you decide on the best moisture content. z .XWb*QGF^v4MQ`_dRw{\;\'03Uhx-SeJlc!m\8X^,Z/hU5Ewdzz:`nZ!(7reWD4X. The normal outside equilibration moisture content (EMC) for Indiana is anywhere from 13% to 16%. For example, a 26 Southern Pine joist can span 12'. Thanks for any help you can provide! I had a quick looked around the crawl space and didnt notice any structure damage. I have built two table tops (douglas fir) that have both suffered major cracking in their final location. 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. If you know such International or Amercan or any other standard please let me know. Production, storage, delivery and construction and in-use conditions that will prevent exposure to external or internal moisture or conditions that would allow the moisture content to exceed 18% at any time: Untreated Douglas fir: Framing in a low-risk building and meeting the requirements of B2/AS1 paragraph 3.2.2.2: Where there is a risk of . Because ventilated crawl spaces throughout the Southeast United States allow high humidity and fungus spores to enter the enclosed space beneath the home. Varying humidity levels can cause wood to lose or gain water and shrink or expand. Most are reading are between 13-15%. I am building a farm style dining table with pecan 2 thick X 8-0 long boards. In the Midwest, the EMC of wood or lumber in Des Moines, Iowa, ranges from 12.4% to 14.9%. Generally the entire floor is dry. The SG setting is on the card that comes with the meter. The chart below will clear things up. The levels were between 20 and 23%. I read your article and really like it. Are the measurements of all wood the same? The thickness of flooring joists themselves will be determined by what's going on top of them. I suspect the screws may be skewing the measurements. 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. Truss Uplift: Who Would Have Ever Thunk It? Floors should be: level within a 3mm deviation per 1m for floors up to 6m across (measured at the furthest points across the full width of the floor) a maximum of 20mm out of level for floors over 6m across flat within a 5mm deviation, measured using a 2m straight edge with equal offsets. I live on the fl coast so what should the moisture level be? Very simple and understandable. Headers, columns, and joists are rotting. Hi Larry, thanks for the great knowledge sharing. Cracks in Concrete Slabs: Should I Be Concerned? 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. I really need to know as I am getting so many different opinions Thanks. Thank You. Its hard to gauge anything off of a cheapo meter, but if and I mean if, we were to assume it was reading effectively, the numbers are too high. They need to carry a moisture meter with them under houses and probe the floor joists to measure wood moisture content. 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. Screwed 2x4s parallel into the joists as added support. Does it have another common name? 10 14% moisture content is too high. If so, then you'll want to know. The best way to do this is to use an accurate moisture meter. The home inspectors working for fees today seem to have one primary motive in mind: to cover their liabilities. Call 256-318-0982 or contact us today. These mold spores land on the wet wood and take root. Damn those shop classes I didnt take. Thanks Phil. in other hardwood areas that wasnt close to the water, was measuring about 16-19%. You should be able to tell where the water reached the subfloor because it will be discolored and may also be swelled up. Standard moisture contents for hardwoods are 6% 9% MC. Hi Larry, just finished a black Walnut dining room table back in November. Just press the scanning plate against the woods surface, turn on the meter, and receive the reading. Two weeks is sufficient for softwood. The moisture content of freshly cut wood is typically somewhere between 40-200%. Cut out a portion (approx 1/2" I think) from the top of the floor joists. Ideally, you want to check the EMC in the area you will be working on your slab, along with the area it will live in. 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. Does that seem normal. Any opinions. For severely rotten joists though, you're going to want to remove the rotten section. Seattles EMC ranges from 12.2% to 16.5%. The shipping time is approximately 45 day in a 40 container to the west coast . Fresh cut trees can have a wood moisture content over 200%, while completely dried wood will have a wood moisture content of 0%. If you want, just give me a call at 800-634-9961, ext 225. Hello, I am renovating my kitchen and installing hardwood floors. I am planning an under-house excursion tomorrow. Squeaks from subfloors The floor installer is often the 'first cab off the rank' when there is a squeaking floor and the problem may When you do this, you not only ensure that the entire batch is okay on average, but youre also far likelier to catch boards that are statistical outliers and could cause problems. hj0Ed=h].J-)_q},jR3$\ eH"wCk)E)J8 This summer I milled several 1.25 boards from a fir log that had been cut around 10 years ago. Good moisture content for hardwoods is 6% to 9% moisture. primer, the moisture vapor transmissions rate (MVtr) from the substrate should not be in excess of 5 lbs. Wood freshly cut or kiln-dried is always interacting with environmental moisture. Thanks. Thanks in advance for your input! Your ideal MC will also depend on the outdoor humidity levels. One of his own service guys said foundation caps needed to be replaced. can be insulated and heated (insulation is mandatory if heated) require careful planning and . We have a free app called WoodH2O for Android or iPhone. This weight difference is then used to calculate the woods original moisture content. Wood in buildings usually has a wood moisture content of 5% to 15%. meter readings of up to 2.0% and in-slab relative humidity (RH) below 75%. i am baffled. One type of wood moisture meter. I was thinking 10% MC would be ok but after reading your article Im not sure. i cored out a small section of the bottom beam (3 inches wide) all the way down to the foundation. This week, I notice the next pier on the same beam is starting to push up, warping the floor. According to Dr. Eugene Wengert, professor and specialist in wood processing at the University of Wisconsin-Madisons Department of Forestry, wood should be dried to a water MC thats within two percentage points of the EMC where the wood is going to be used. As the humidity decreases, the MC decreases, causing the wood to shrink. I have a black walnut slabbed up that has been air drying outside for 2 yrs. In March of this year I had new white oak 2 flooring installed. I did not find any information on Matumi. I built the tables in west Texas, but their final home is in Colorado. 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. As the airs RH increases, so does the moisture content of any wood exposed to the air. When determining the acceptable moisture levels in wood flooring before installation, the NWFA states that the flooring professional should establish a baseline for acclimation. 20% 28% Readings in this range indicate that conditions are border-line for decay. This article is really helpful. You mentioned it was installed just 3 days after it was delivered. However, this time I was planning to use oil based poly rather than the spar urethane to reduce the amount of yellowing. I had several of the varnished decorative hardwood laminated ply panels replaced in the lounge on an air conditioned luxury yacht. h26P0Pw/+Q0L)66 The photo shows a floor that is out of level over four or so boards adjacent to the external wall. The purpose of acclimating is to allow the flooring to equalize to the surrounding conditions, no matter how large the room is. Furniture maker Lonnie Bird weighs in, I dont want the wood to shrink after I use it because the wood will warp or split.. Im planning on using some of it to build a new front door for the house and was wondering what MC I should be shooting for. Should I remove more foam to be sure. If a board reads 100% (Difficult to measure accurately) then the weight of the water equals the weight of that wood. What is a Proper Structural Engineering Inspection? 24 and 26 framing studs should measure 19% moisture content or less. This means that wood intended for interior use in this location should not only be dried to around 6% but should be kept at this moisture content both before and during the manufacturing process. : Mold & Fungus In the Crawlspace. Be notified when an answer is posted. 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. Floor joists are generally 6, 8, 10, or 12 inches in width, with 8 or 10 inches as the most common sizes. 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. Where floor s have been covered by previous floor coverings acceptable values are up to 3.5% and 80% in-slab RH. board. Wood is hygroscopic. The joists can be longer or shorter as required by space and size, and are typically spaced at either 450mm or 600mm apart. The next question is almost the same as before, if we have various kinds of wood, such as March wood, mango wood, pine. They need to carry a moisture meter with them under houses and probe the floor joists to measure wood moisture content. You can Google moisture content of wood necessary to support fungal growth and see for yourself. We have had very bad cracking in sheetrock and floors. Hi Moisture Experts, My house is 25 years old located in Oregon City OR (near Portland). Although some movement can be expected between 6% and 9%, wood flooring can shrink or swell more dramatically outside this range. Room size, L-shaped, is 21.5 x 12.5 and leg of L is 8.5 x 11. A company sealed off the foundation vents and removed all the insulation from the crawlspace with the humidifier mitigating the moisture from the leaks. Do you agree with this? Kiln-dried wood usually shows a moisture reading of 10% on the outside and then 25% on the inside. moisture meter testing a floor joist In this image we measure a reading of 37% in this floor joist. There will most likely be some shrinkage, so if possible, choose the clearest boards possible to lessen the possibility of any major cracking. Were so sorry for the inconvenience. Percent moisture content in wood is the ratio of the weight of water compared to the overall weight of a piece of wood. It constantly absorbs and releases vapour into the . 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. The ASTM D4442 standard determines the accuracy of wood moisture meters. Drying teak hardwood from a humid climate, for use outdoors in a much drier European climate? Floor joists come in dimensional lumber lengths from 8 to 16 feet or more. Perhaps better drainage around your house will do the trick or treat. But this wetness is only surficial. Im in Milwaukee, wi if that matters. The solution seems to be drying the wood longer & bettter, to a lower measured MC. Simply put, the post offers some useful information. Please give us a call at (800) 634-9961 or email info@wagnermeters.com, if youd prefer. Here current humidity is 76%. Subfloor material such as plywood or OSB should measure between 10 and 14% moisture content. -25% moisture content in a VENTED crawl space. Insert the pins into the surface of the wood you want to test. So chart would indicate around 9%. Lets go over the basics of each, Oven dry testing is the oldest method for measuring the moisture content of wood. 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. Drying equipment removed 3 days ago. 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 have any recommendations on how to prevent mold from getting on the wood? However, it The size of the lumber used for floor joists is the single greatest determining factor in terms of how far a joist can span. Copyright - RLC Engineering, LLC. Have I been wrong? 25-30 - Actual, and often extensive, damage is evident when readings reach this level. Continue reading MC in the home. Hope this helps. Live in Tn. You must be careful with a thick slab once you cut it. Next, check the moisture of new floorboards. So we are seeking redress, but there are jacks present underneath the home which the home inspector didnt report either and didnt know if this was extra support for the water heater or what. Thanks. 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 hes 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. I found your website at just the right time. Also, if the leak was bad enough, it will be necessary to have a contractor make sure the strength of the subfloor isnt compromised. Wood Handbook: Wood as an Engineering Material, https://research.cnr.ncsu.edu/blogs/wpe/files/2016/08/Equilibrium-Moisture-Content-of-Exterior-Wood-in-the-US.pdf, https://www.wagnermeters.com/shop/orion-950-smart/, http://www.csgnetwork.com/emctablecalc.html, https://www.spikevm.com/calculators/logging/equilibrium.php, https://www.wagnermeters.com/shop/orion-910-deep/, https://www.google.com/search?source=hp&ei=j6WRW76_NdmT0PEPkN29kAc&q=wood+moisture+content+and+mold&oq=moisture+content+and+mold&gs_l=psy-ab.1.0.0i22i30l3.8963.15970, Restoration Expert Says Moisture Management Critical to Health of Any House or Building, Correct Moisture Content: Critical to Your Woodworking Projects, Mckinleyville Middle Schoolers Learning about Wood Moisture Content, Ambient Data Loggers: Peace of Mind in a Box for Wood Flooring Installers, 5 Things Not to Do When Measuring Moisture in Wood Flooring, Alabama Wood Crafters Share Wood Woes When Overlooking a Moisture Meter. Post and beam constructions don't have to be kiln-dried but should be air-dried. Thanks for the email. These home inspectors are insecure and inexperienced. These are the "safest" conditions for most types of woodbetween 60 and 80 degrees Fahrenheit and 30% to 50% RH. This only occurs when wood changes moisture content below the fibre saturation point. With regard to mold growing on your furniture, I would have to defer you back to the shipping company as they have more experience dealing with these types of issues. Your cost could be more or less, depending on the size of the floor area. Its always a good idea to check with the manufacturer of the finish also. Under the floor. We are very arid where the tops were built so I figured the tables would be just fine knowing that it is arid where they were goingbut that doesnt seem to be the case. the curb is built with 3 2/4s stacked on each other. Though on occasion, they are made of 2x10s and tripled for additional . This is a perfectly normal moisture content and one that will not support fungal growth. I have seen that 13.5% is high for furniture and you should aim below 12%. There is only so much moisture a piece of wood can give up, over time, before a failure occurs. The process is time-consuming but produces accurate results if followed correctly. Let's repeat that again. 12% 16% Readings in this range are common to lumber during construction, air dried lumber and healthy residential substructures (beneath first floor in crawl spaces). About how long do you think we should allow the new wood to acclimate in the end use environment before installing it? endstream endobj 80 0 obj <>stream As this moisture condenses on the floor system, it wets the wood. 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The other was for a $100 retail gift card. Step 1: Check the Floor. In an air conditioned house the wood floor. Timber logs & Lumber into India company remained actively involved in harvesting and sale of Hardwood logs of Indian origin. For example, from 25% to 45% or from 45% to 65%. There is over three foot of block above grade around the entire house. With a Wagner L606, I am getting MC readings 12%->15.5% . The wood scale provides accurate, quantitative readings of moisture over the range of 5% to 30% MC in wood. My house is 24 years old. Joists that sit below end matched joints must be at least 35mm thick. Treatment levels for timber and timber-based materials used under tiles in wet areas where the waterproofing membrane cannot easily be inspected or maintained should be: H1.2 for timber floor joists and wall framing around showers; H3 (CCA treated) for plywood. Because of the different materials involved, they will react differently to high heat, thus giving you an un-even plywood surface. Also, the glue manufacturer should ideally give you some specifications for max and min moisture content. Be sure to acclimate the wood to desired EMC of the interior environment before you use it. I live in Atascadero CA and had a coastal red oak tree cut down this past summer. Here is a link to our new line of meters: https://www.wagnermeters.com/moisture-meters/. Failure to allow the wood to acclimate or come into balance with the RH at its end-use location could result in any number of moisture-related problems after the wood product is constructed. Larry: I recently had my annual termite inspection. "Mold requires moisture to survive, so protecting lumber and wood structures from moisture will prevent mold growth. In general, all wood products will swell with an increase in moisture content and shrink with a decrease in moisture content. could you please guide or on how much should be the Expected Humidity % in high Humid areas like UAE considering these are mostly for Indoor purpose where ACs are on 247 at say 24 Degrees. Toilet overflowed and moisture meter is reading 30% in worst area. It seems to me the supplier is drying the Teak to 14% because that is what is needed in Indonesia. h_k0 r ?c|@+wpF=M^r? ( BzPxgA9P{j]s 3r\WQu\@U.Jy'h{>dccy. 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. summary Wood must always be allowed to acclimate or come into balance with the RH of the end-use location. Hello Larry I am from Bangladesh. Please help with T%, I have seen where 30% moisture loss by weight is a good rule of thumb to shoot for. Whats the Difference Between a Home Inspection and an Engineering Inspection?

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