To do so: Make two vertical cuts through the joist a safe distance away from each end of the rotten section. 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. Can I a cut them first, then glue them once they are dryer? BD-2100 Pin Meter. Perhaps there is something different about the East and West walls. Thanks for the email. 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. The plywood setting is .57. The normal moisture content of wood (or EMC) varies from 7%-19% depending on the RH in the air. Cracks in Concrete Slabs: Should I Be Concerned? Utilize the chart on following page to record the environmental readings at the time of installation. You can now understand the meaning of moisture content 5.5%, 15 g/m2/24 hours, and relative humidity 75% with these facts. Wood exposed to air with a RH of about 90% will reach a Wood Moisture Content of about 20%. 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. Like all wood materials, I-joists are susceptible to moisture. Here is a link to a calculator and table: http://www.csgnetwork.com/emctablecalc.html. I have built two table tops (douglas fir) that have both suffered major cracking in their final location. For solid strip flooring (less than 3 wide) there should be no more than a 4% difference in moisture content between properly acclimated wood flooring and subflooring materials. As with plywood subfloors, if there is movement or squeaks, refasten the subfloor to the joists and set protruding fasteners into the subfloor. Please dont pay for a Borate spray unless the buyer wants to pay for it. Well, tile, bricks, and stones are known to have a low water-holding capacity and therefore should be dry. Wood is a hygroscopic material that contains water, even after it is cut from a tree. If an interior location has an average RH of 40-52%, wood placed there will have an average EMC of 8-9%. Let's repeat that again. Thanks Phil. Your table may have been a little too high in moisture, hence the crack as it dried slightly in the drier environment. Im in Milwaukee, wi if that matters. To avoid this problem, wood flooring should never be stored where environmental conditions are uncontrolled, such as garages and exterior patios. After all, the wall is in contact with damp soil. Larry Loffer is a senior technician at Wagner Meters, where he has over 30 years of experience in wood moisture measurement. Thanks for the the information, very detailed and useful. Your reading of 12.5% tells me it is workable. Add 1 to this value and round up the answer to the next whole number: 7.40625 + 1 = 8.40625 9 floor joists. Its never constant. . Timber logs & Lumber into India company remained actively involved in harvesting and sale of Hardwood logs of Indian origin. 15% is too high, at least for hardwoods. Call JADE today for a crawlspace inspection and we can give you definitive answers to your crawl space problems! 1. You must be careful with a thick slab once you cut it. 800-347-7260 Fax. The difference between the wood subfloor and the hardwood flooring shouldn't exceed 4% for solid strip hardwood . 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 amount of swelling or shrinkage depends on how much the . This can lead to rising damp, dry rot, timber decay, fungal growth and borer. 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. . The ceiling in the bedroom above the chimney breast shows signs of damp however doesn't feel damp/moist. Request Answer. What is a Proper Structural Engineering Inspection? Since wood is hygroscopic, it loses or gains moisture depending on the relative humidity of the surrounding air. 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. The moisture content of wooden substructure members is routinely being disclosed in the closing process of real estate transactions. Reaching these moisture content levels does not mean mold growth or corrosion . The house was not in the flood area however they did receive 20 inches of rain. Maximum Moisture Content Of Concrete This is a nominal value most product manufacturers specify when concrete is dry enough to allow their product to lay down on it. That is way beyond fibre-saturation. 25-30 - Actual, and often extensive, damage is evident when readings reach this level. Prior to the re-shim, the pier in the area that floods in the spring could be felt pushing up the floor, meaning the beam is warping and been monitoring it. As long as the moisture content does not exceed those readings you should be ok. My meter tells me anything above 12% is wet but I cannot find any source of leaking or signs of water. The home inspectors working for fees today seem to have one primary motive in mind: to cover their liabilities. Hi Larry, thanks for the great knowledge sharing. Be sure to acclimate the wood to desired EMC of the interior environment before you use it. The National Wood Flooring Association (NWFA) has specific installation guidelines for wood flooring and how they relate to moisture content. If a wooden sample has moisture content range of 2-6% only and if it has moisture content of 9 or 10% then what does this mean?? Had fans and dehumidifer running for 17 days starting 2 days after leak. The subfloor registered from 12% to 17% . 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. The interior was 3/4 BW the tables dimensions were 40x 70 . I am building a farm style dining table with pecan 2 thick X 8-0 long boards. At this home, cool objects include the air conditioning ductwork, the ground and the overlying wood floor system, which is exposed to very cool temperatures due to air conditioning duct leakage. Ideally Ill wait until reaching final drying but sometimes I need to use wood before that point. Im down to ~13-19% MC near floor level, based on a cheapo moisture meters readings. It will be there for a few months before I begin working on it. We really cant overstress the importance of taking plenty of moisture readings. Is this accurate? somewhere. 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. provide a good substrate for a wide range of wet area finishes. 7. You are correct, furniture grade hardwood is typically dried between 6 to 9%. I have used spar urethane as a finish on a few other 12 to 18 MC (semi-wet) log projects that turned out wonderfully. Also, if the leak was bad enough, it will be necessary to have a contractor make sure the strength of the subfloor isnt compromised. or finally the product will be placed where. Mold and fungus in the crawl space can definitely become a problem, but dont be fooled into thinking that a Borate spray HAS to be applied in EVERY situation. Jerry, From a moisture standpoint, water in the basement can over time absorb into your subfloor. 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. If humidity levels in the crawlspace with all these measures taken place is above 60% the joist and the subfloor will have a high MC reading. Typically, allow about 3 weeks for hardwood to acclimate in the environment. They are returning to remove one plank and take it back to see what they can do to meet my satisfaction. Post and beam constructions don't have to be kiln-dried but should be air-dried. Add an answer. I am planning an under-house excursion tomorrow. Wagner has a free app called WoodH2O to help you determine the proper moisture levels based on consistent humidity and temperature. Its not growing or feeding on the wood. I had engineered hard wood installed and it is curling at the joints. This week, I notice the next pier on the same beam is starting to push up, warping the floor. 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. Which do you recommend? We are manufacturer of eng wood flooring. 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. The acceptable wood moisture content normally ranges from 6% to 8% for woodworkers who build cabinets, fine furniture, musical instruments, dishes, toys, decorative art, boat restoration, or various other wood products. Higher values could mean a wet or saturated material. Typical humidity levels inside a home is between 40 to 50%. Brilliant article. With the WoodH2O-app I could deduct the EMC for The Netherlands would be between 15 and 16. Each piece of lumber is unique and carries physical characteristics that may include the following: knots, warping, shrinkage, swelling and/or splitting. 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. Above 90% RH or 20% WMC, mold can grow on the wood. Installers should also measure the moisture in wood subfloors and concrete slabs as they can also affect wood flooring. The humidity in the room is currently 40! It is not uncommon for wood to expand or contract as much as a 1/8 per foot of width, so maintaining a stable environment is important. Your help for resolving this issue would be highly appreciated . The moisture content of freshly cut wood is typically somewhere between 40-200%. Hello Larry I am from Bangladesh. )IS0i 1P *V? U? Hello and thanks for writing in. hL They need to carry a moisture meter with them under houses and probe the floor joists to measure wood moisture content. 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. The table had a 1 3/4 X 3 1/2 thick boarder with mitred corners and biscuited. It constantly absorbs and releases vapour into the . Thanks Mark, The EMC outside and the wood should be the same. 2013-10-14 03:14:29. We found out that RH at the final location was under 20%. I am not aware of a standard moisture content for packaging food or any other product. RH where they were built is about 29-30%. 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. I would also consider the environment where the table will live. Here is a link to our new line of meters: https://www.wagnermeters.com/moisture-meters/. The thinner veneers wont have much bearing on the reading. I have one question with regards to pinless moisture meters and wallboard/Sheetrock. SE, Huntsville, AL 35802. 10? Please help with T%, I have seen where 30% moisture loss by weight is a good rule of thumb to shoot for. of water/day/1000 sq. But when you touch the pins to the embedded screws, you get between 14 and 24 % in various areas of the board. I dialed the 800 number for Wagner meters and all I got was two sales pitches for a Life alert type device. The wood joists are not soaked wet, its just a light film of moisture on the wood members. -ThA?> =v\0r5#v ,J\Byt)%*?I!PT`FdCE N a^1IMm[?x>7RFH +=\ I so appreciate your treatise on this issue. When I purchase it its soaking wet and Ive 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%. The other question is what should the moisture content be on treated lumber that will be for the framing of the deck? "R. Observed water leaking along seams of several sheets of original plywood in attic. The three main sources of moisture: Condensation, Foundation wall transfer, and leaks. Subfloor material such as plywood or OSB should measure between 10 and 14% moisture content. Back to top. What You Should Know About Septic Systems, Interior Slab Foundation Settlement: Evaluations and Cost of Repair. Condensation present on the . Thank you. Thank you for your very informative knowledge about all of the items on this page. The Building Code states that houses must be built so that a 50-year flood will not enter the building. Knowing were all the piers are, I can stand on top and feel a small hump in the floors. For instance, the subfloor may appear to be dry on the surface, but still have elevated moisture within the panels. I am shipping teakwood furniture from Indonesia to California. i did not waterproof the outside of the curb (kerdi), so the wood got wet. ( 55 days transit by sea) What should be the moisture content while loading in Containers? i am baffled. We will be having a deck built off my woodshop. These home inspectors are insecure and inexperienced. 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! It seems to me the supplier is drying the Teak to 14% because that is what is needed in Indonesia. At that point in time, we did not have a conditioned house. If so, then you'll want to know. Therefore, just because the wood is kiln-dried doesnt mean it has lost the ability to absorb moisture. Thanks!!! For joists where the rot infestation has been thoroughly dealt with: it is acceptable to leave the joist as it is. I requested the treated lumber be brought in a few weeks prior to build, stickered and put under cover to acclimate and dry it. wood using pins while the MDF uses pinless? 9Chrv;plt[nh%:fOl8e^5e cM(?=6?y8{6uZkpz[TgLXD9feUm.L;l7:5C:hf=tE&U[&8 ^ wu*Vz*##;PKk? The SG setting is on the card that comes with the meter. 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. Readings can be elevated if there is a stud directly behind the sheetrock. We also have an Orion 950 moisture meter that will automatically give you EMC (Equilibrium Moisture Content) and other useful statistics. This is based on a chart in Wood Handbook: Wood as an Engineering Material. And it's important to keep in mind that a glued-up panel behaves basically as one wide piece of lumber. Thats why I think the wood is either not dried to 14%, or it has picked up too much humidity after drying. guide-standards-tolerances.pdf. When wood is subjected to an environment that is higher in humidity, it will swell or expand. 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. Houses with timber-framed floors can be at risk of having poor underfloor ventilation. 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-!) Here is a link to a moisture meter I recommend: https://www.wagnermeters.com/shop/orion-910-deep/. Standard moisture contents for hardwoods are 6% 9% MC. 78 0 obj <>stream Grain orientation matters You should be able to tell where the water reached the subfloor because it will be discolored and may also be swelled up. Cheers, Howard Pruden in Edmonton, Alberta where its cold and dry. 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. Joist spans may not be on the minds of most do-it-yourselfers, but joist spans are everywhere: above our heads in the ceiling joists and below our feet as flooring joists. Any suggestions to this being possible to correct? Many of our customers are successfully using our hand held moisture meters on engineered flooring. This method uses the oven-dry method and then compares the results to those obtained using a moisture meter. i also drilled into the wood every few inches, several inches deep with a typical drill bit. Floor joists support most of your home's weight and play a crucial role in structural integrity. I have a couple questions. The average annual relative humidity will play the biggest role in determining what the optimal MC should be. They are in an unheated and currently very cold barn The moisture ranges from 11% -16% according to my meter. If the moisture is less than 20% and the floor joists are structurally sound, like the joists at this home, there is no need to worry about any fungal staining that might exist. A wood moisture content of 47% is too high. I live in coastal South Carolina .we are definitely afraid of mold formation. Do you think that heated floor actually help to dry or do they make things worse and more humid! 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. Heres how it works. Does coating wood with oil stabilize the moisture content in wood? Freshly cut wood has a lot of moisture in it. I wanted to talk to someone at Wagner about moisture guages and is there a dealer near Chattanooga, TN. What % does it have to get down to before it would be usable to make a table top ? Many timber-framed floor problems can be traced to moisture levels, excessive loads or borer. Remember that the meter assumes it is reading timber. I suspect the moisture was the culprit? 0 WM=8DBaHh10tIKR/OH}X5Kpt'_]4Mfg9@w8~ n$R They were installed over existing plywood subfloor. Not using the correct procedure. In March of this year I had new white oak 2 flooring installed. Hi Moisture Experts, My house is 25 years old located in Oregon City OR (near Portland). Hello Brian, I am a moisture meter expert, not a woodworking expert but from your description, the problem points to the conditions, not the wood or joinery. If the conditions are too wet, dehumidify, and if they are too dry, humidify. I buy many Artificial Trees for our Stores, which has Wood Stems/Barks, mainly produced in China & Shipped to UAE. Whats an acceptable moisture level for a brick wall in a house? Eventually, this internal moisture will evaporate by itself. 2. Hello! Was told thats not done. Every home's foundation repair needs are different based on soil type, type of foundation problem, and climate. Will the reading be accurate? What wood do you recommend that does not have a high oil/water content? It will continue to absorb and release moisture until it comes into balance with the surrounding air. Does Brick Veneer Cracking Mean Foundation Problems? Stopping the moisture is much cheaper and easier than repairing the structure. A 10% moisture content reading means that 10% of a wood samples weight is due to water in the wood. how do I determine the mc standard for this material, is it the same as wood or has its own specifications, 2. The fir stock was originally KDd to around 8% but has been covered and stored outside for over a year and currently MC is around 12%. In this case, what Built in # that I can use to measure flooring. How to test moisture /water content in cassia bark? 28% and above Readings in this range are often accompanied by decay damage. 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 https://www.spikevm.com/calculators/logging/equilibrium.php This will tell you what the MC% should be based on your specific environment. Furniture maker Lonnie Bird weighs in, I dont want the wood to shrink after I use it because the wood will warp or split.. In general, 12% moisture or above is too wet to install flooring. How long will it take to get to the ideal moisture reading and is it better to be stored in a garage or inside a house? Wood freshly cut or kiln-dried is always interacting with environmental moisture. Set the meter to the species that makes up the bulk, in this case, the plywood. -XF% to keep the moisture content below 20 percent. So, to sum up, Moisture in crawlspaces is bad. Thank you for sharing such valuable information. The moisture content overall is almost always below 20%. The cedar I have is now at 12-16%. Longer pins with insulated shafts are designed for the purpose. 541-679-2612 www.Roseburg.com. As it dries, you should expect slight changes in width and length. Furniture grade wood is typically dried to a target of 6%-9%. water leaked over the edge. I appreciate you sharing this important information with us at this time. This is for furniture-grade hardwoods. The joists can be longer or shorter as required by space and size, and are typically spaced at either 450mm or 600mm apart. Why Do So Many Homes Have Cracks in Their Brick Veneer? It is possible, in some species, to have a moisture content higher than 100 percent. I believe you are asking for the percent moisture content (humidity) of South African woods. Sometimes moving the air around is enough to remove moisture and dry surfaces. Because the moisture content of wood is equal to the weight of the water in the wood divided by the weight of the wood without the water, its possible for the moisture content to exceed 100%. h_k0 r ?c|@+wpF=M^r? ( BzPxgA9P{j]s 3r\WQu\@U.Jy'h{>dccy. It gains or loses water moisture as the relative humidity (RH) of the surrounding air changes. A mold or mildew odor or appearance on surfaces. Wagner Meters has a couple of resources to help you determine the moisture content more suited to your outdoor environment. Wonder if they are trying to cover themselves. Once the wood samples weight stops changing, its weight is compared to what it was before the drying process began. 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. We are checking moisture levels in several areas each day. The engineered wood floor appears ok. Any thoughts as to what the issue was with the first install so we dont have the same issue again next year after we go through a new install? 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? The NWFA recommends testing wood subfloor moisture in at least 20 locations per 1,000 sq. A good moisture content is between 6 9% for Colorado. ft., based on a standard AStM F-1869 (Calcium Chloride) test, or 80% rh, based on AStM F-2170. Below a 17% MC of wood, virtually no microbial growth will occur on even the most susceptible materials. They are currently nearing equilibrium (around 12 MC) and are stored within the house. Including some high-end species like Rosewood, ebony, Mahogany, White Cedar, Bija Sal, Walnut, Gmelina, etc. We have started to import teak outdoor furniture from Indonesia into Europe. It is important to have the same temperature and humidity during those 2 weeks that will be maintained after installation. This is more likely to occur to occur in lower-grade boards, where knots and uneven grains are already present. My question is regarding finishing. Two weeks is sufficient for softwood. In general, all wood products will swell with an increase in moisture content and shrink with a decrease in moisture content. You will however, need to become familiar with reading your local floor joist span tables for floor beams, floor joists, window and door lintels, ceiling joists, roof joists, roof rafters, and roof ridge beams, as well as the sizing and spacing of wood studs tables. Want this question answered? First, test the moisture level of the subfloor. 1 4 The normal outside equilibration moisture content (EMC) for Indiana is anywhere from 13% to 16%. This can be a problem once installed in furniture or a floor. We have a free app called WoodH2O for Android or iPhone. Truss Uplift: Who Would Have Ever Thunk It? 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. Simple and regular maintenance can prevent serious problems developing. Hello Folks, I am new to wood turning and do not have a ready supply of dry/seasoned (my wood is green) wood. Softwoods, such as spruce, can have more moisture. Box 1088, Roseburg, OR 97470 Tel. Joists that sit below end matched joints must be at least 35mm thick. 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