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Floors-1/2" in 12' or 3/16" in 4'. Back to top. The excess moisture source must be immediately corrected, and the situation carefully monitored until the WMC returns to the 12-16 range. Cheers, Howard Pruden in Edmonton, Alberta where its cold and dry. They said if i wanted to spend the money, a humidifier would help keep the humidity inside the house more consistent throughout the year. And would it be normal for the MC to vary from board-to-board and one end of a board to the other? Just across the threshold to a white oak floor installed in ~1914 and the MC is 15%->16%. 28% and above Readings in this range are often accompanied by decay damage. Hi Larry, thanks for the great knowledge sharing. As far as the oil finish, the manufacturer of the oil will specify the correct moisture content for an application. Cracks in Concrete Slabs: Should I Be Concerned? Alternatively, you could set up a crawl space dehumidifier and draw the . 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. Please give us a call at (800) 634-9961 or email info@wagnermeters.com, if youd prefer. Hello and thanks for writing in. I had a water leak under my crawl space which has 3 inches of foam insulation applied to the underside of the sub floor. If he is using a high-quality product from companies such as Delmhorst, they provide a slide hammer pin attachment, and they need to use insulated-shaft pins. Yes, the wood can still be read for MC with a stain on it. We have had an abnormally wet spring and part of summer. Your reading of 12.5% tells me it is workable. Thank you so much for your time and expertise. The plumbing was improperly installed with the wrong cement to fit the pipes and could have been leaking from anywhere between 5-29 years while absorbing into the ground. Perhaps try to seal the vapor barrier better around the piers. Perhaps there is something different about the East and West walls. As the humidity decreases, the MC decreases, causing the wood to shrink. Hi, we live in a coastal area, had a recent water leak, and a hard wood floor MC is measuring about 25% the water did not contact this area directly. 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. All that needs to be done at this home is to close-up the foundation vents during every air conditioning season and make sure the ground cover vapor barrier is spread completely over the underlying ground surface. Substructures with WMC in this range may show decay or rot in floor joist, sills, and subflooring. For more information, see our article comparing Pinless Moisture Meters vs. Pin Meters. Water was coming out of this outlet and onto the floor? SE, Huntsville, AL 35802. The size of the lumber used for floor joists is the single greatest determining factor in terms of how far a joist can span. A high reading in one area indicates a problem that must be corrected. My question for you is: after a smallish unheated underground space (similar to a basement, i.e. The ideal moisture content for hardwoods is between 6% and about 9%, depending on the ambient conditions around the wood. First of all, it's normal for a below-grade concrete block wall in contact with the soil to have a high moisture content. 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. The other was for a $100 retail gift card. moisture will typically measure 7-10%. Does it have another common name? 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. Once the wood samples weight stops changing, its weight is compared to what it was before the drying process began. I checked it with my new moisture meter and had a reading of between 8-13.5%. The SG setting is on the card that comes with the meter. A company sealed off the foundation vents and removed all the insulation from the crawlspace with the humidifier mitigating the moisture from the leaks. Here is a link to a moisture meter I recommend: https://www.wagnermeters.com/shop/orion-910-deep/. What is the acceptable moisture level for plywood? 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. 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. It does the same for wood, and is especially hard on softwoods, such as pine or fir. Drying equipment removed 3 days ago. So chart would indicate around 9%. "R. i cored out a small section of the bottom beam (3 inches wide) all the way down to the foundation. %PDF-1.2 % I took readings of the moisture of the sub floor at the edges of the wall and it ranged from 5 to 16, problem is i cant take it in the middle of the floor unless i rip the floor out. I want to use it to build a table and will be moving it to the location where I will work on it shortly. 2. Were in northern Indiana, humid summers long cold winters. One type of wood moisture meter. Then placing his pin meter on the screws. 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. Box 1088, Roseburg, OR 97470 Tel. endstream endobj 80 0 obj <>stream Having performed multiple (>500) soil moisture and density Sieve and Proctor, so I am well versed in moisture calculations (both add and subtract). I have seen home built in the dead of winter, covered in snow, and still dry out enough for a successful home build. Its more important to understand that the wood is kiln-dried down to a certain bell-shaped range of MCs. I dont know what type of floor you have, but if it gets wet enough, about 25% moisture content or higher, mold can grow. Most of it will dissipate. My plan is to make a wall-mounted headboard out of angle iron and these boards (boards will not be joined). 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. We also have an Orion 950 moisture meter that will automatically give you EMC (Equilibrium Moisture Content) and other useful statistics. Thats why I think the wood is either not dried to 14%, or it has picked up too much humidity after drying. I would have thought that if the floor gave a 99.9% water saturation reading, it would have had to have been noticeably wet. I have built two table tops (douglas fir) that have both suffered major cracking in their final location. I have seen that 13.5% is high for furniture and you should aim below 12%. In an air conditioned house the wood floor. You can use our free APP called WoodH2O to help you decide on the best moisture content. This must be done before attempting to dry out the wood. For instance, the subfloor may appear to be dry on the surface, but still have elevated moisture within the panels. It is possible, in some species, to have a moisture content higher than 100 percent. My question is regarding finishing. 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. Its not growing or feeding on the wood. Would the screws skew the measurements? Ev 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. Do you think that heated floor actually help to dry or do they make things worse and more humid! Fungus loves wet wood. 2013-10-14 03:14:29. Mobeen, If a wooden sample gains moisture, then the sample will increase in size. Im trying to find specs on treated lumber for NC. I have used spar urethane as a finish on a few other 12 to 18 MC (semi-wet) log projects that turned out wonderfully. Any suggestions .thanks. This summer I milled several 1.25 boards from a fir log that had been cut around 10 years ago. Im not sure I can really answer this question. As stated, fungal spores are beneath the home because they are in the air we breathe-the same air that gets circulated beneath the home. A moisture content that is too high will also slow the cure of the SLu and can affect the subsequent floor finish. at one spot, its 40%. The next sheet is 21.5% adjacent to 2X4. It is best to allow the wood to equilibrate to the room environment. 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. Most interior wood is in this range. We just had a hydrometer installed in the crawlspace and it is reading 38% as of today. About how long do you think we should allow the new wood to acclimate in the end use environment before installing it? This pinless meter is accurate, Ive got 2 other pin moisture meters and all 3 of them read within only 1-3% difference as checked on wood structures. It was such a good read. (864) 506-4701, South Carolina Residential Construction Standards, http://www.rlcengineering.com/wp-content/uploads/2019/04/RLC-Engineering-1.png. 12.5% is gettin there but not quite to the 6-9% mentioned in the article. What are Acceptable Moisture Levels in Wood? Check joints and bottom plates as moisture can get trapped here. We found the problem and the leak was resolve quickly! The acceptable moisture levels in a crawl space are between 30% and 50%, with under 55% being the ideal. Phil, what are you making with the cedar, and in what type of environment will it be? Limit the length of notches to 1/3 of the joist's depth. Outdoor temp is 99*F. Is this normal? Waterproof membrane . ft., based on a standard AStM F-1869 (Calcium Chloride) test, or 80% rh, based on AStM F-2170. However, many building materials may have been dried down to about 15% moisture content. for a mere $4900. This will drastically speed up the drying process. Using South Carolina Residential Construction Standards to Solve Problems, Website by Integritive Web Design :: Asheville, NC. Sorry, that time of year. Want this question answered? Your email address will not be published. I have 1 1/2 thick cherry boards that I had milled from a tree in my yard last fall. Using a moisture meter before painting can help you determine the moisture content of the wood. I have about 3,000 sqft on my first floor and this was relatively consistent throughout. Notice that the EMC of the in-use location is the same as the MC: So, using this chart, we know that in an area of the country where the RH inside a home or office is anywhere from 26-32%, both the EMC of the in-use location and the wood moisture content kept in that location will be 6%. I am not aware of a standard moisture content for packaging food or any other product. Other than causing structural damage, too much water can result in mold growth. Did the Contractor mention anything about the structural strength of the joists? Normal moisture content of wood ranges from 7% to 19%. Although some movement can be expected between 6% and 9%, wood flooring can shrink or swell more dramatically outside this range. One of the beauties of spar is that it allows the wood to move quite a bit, while still retaining good adhesion. I really need to know as I am getting so many different opinions Thanks. For most areas of the United States, acceptable moisture levels of wood and lumber can be in the range of 9% to 14% for exterior wood or for building envelope components within constructed assemblies. Do you agree with this? or finally the product will be placed where. Wide-spread and often extensive moisture damage occurs in residences across the state of South Carolina and elsewhere in the Southeast due to the regions warm, humid climate. I hope this helps. However, the ideal humidity range in some climates may be higher or lower. h26P0Pw/+Q0L)66 wood using pins while the MDF uses pinless? Readings can be elevated if there is a stud directly behind the sheetrock. There is over three foot of block above grade around the entire house. 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. If the conditions are too wet, dehumidify, and if they are too dry, humidify. Great article! This means the weight of the water exceeds the weight of the wood by itself. The house was not in the flood area however they did receive 20 inches of rain. 16% - 20%- Readings in this range indicate a possible elevated level of wood moisture. Before installing carpet, you will need to dry the subfloor first. 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. 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. I live in michigan (humid summer, long cold winter). Effects of Moisture on I-Joists and LVL April 2007 P.O. Floor joists come in dimensional lumber lengths from 8 to 16 feet or more. They are in an unheated and currently very cold barn The moisture ranges from 11% -16% according to my meter. When it hits the cooler air of the crawl space, it increases the relative humidity by about 2% per degree! Lets go over the basics of each, Oven dry testing is the oldest method for measuring the moisture content of wood. This is the standard in the construction industry. On truss/joist spacing of 16" (406mm) o/c or less, the industry standard for single- panel subflooring is nominal 5/8" (19/32", 15.1 mm) CD Exposure 1 Plywood subfloor panels ( CD Exposure 1) or 23/32" OSB Exposure 1 subfloor panels, 4' x 8' sheets. This makes pinless moisture meters perfect for measuring the moisture content of things like expensive hardwood floors. I believe you are asking for the percent moisture content (humidity) of South African woods. Remember that the meter assumes it is reading timber. Do these levels seen appropriate considering the recent rainfall. We have a free app called WoodH2O for Android or iPhone. Now would the pine be okay to use as a top cover piece to an radiator cover? I-joists are comprised of top and bottom flanges, which resist bending, united with webs, which provide outstanding shear resistance. Subtract the width of your floor joist from your floor's length: 120" 1.5" = 118.5". There are areas where organic growth was very active to cause deep, black discolorization. Additional care is necessary if laying parallel to the joists and sheet subfloors can sag between the joist. Since Im drying them outside, being in AK I would like to work with them if possible before the long moist winter. Thanks for the question. The excess moisture source should be corrected immediately, and monitored until the WMC returns to the 12-16 range. We are checking moisture levels in several areas each day. we are presently constructing a new timber frame residence on ocean front in BC, Canada. Home Moisture Meters Acceptable Moisture Levels in Wood Knowing the Moisture Content. I think mine is +-3% Is it possible being near the door just means greater humidity and there isnt actually a leak? It is also possible to have moisture content readings over 100%. My house is 24 years old. The next question is almost the same as before, if we have various kinds of wood, such as March wood, mango wood, pine. You must be careful with a thick slab once you cut it. Wood in buildings usually has a wood moisture content of 5% to 15%. This can be a problem once installed in furniture or a floor. Wood is used to clean model railroad tracks. 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. One of his own service guys said foundation caps needed to be replaced. During the summer, moisture content readings above . Keep indoor humidity low. I get some water seepage through an exterior wall at basement floor level as a result of heavy rain. I just bought a live edge slab of Cherry from a local sawmill that was kiln dried. 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. Obviously, the ambient conditions within which the wood or paper is present can alter the MC% of the wood or paper. info@rlcengineering.com Also, there is a risk of mold. Surface molds may develop. 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