Moisture levels in your crawl space that go beyond 70% lead to mold growth and health concerns. Do you agree with this? ( 55 days transit by sea) What should be the moisture content while loading in Containers? 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Since your subfloor may be concrete or wood, you should make sure you choose a meter that is specially designed for the specific element you are testing. I get some water seepage through an exterior wall at basement floor level as a result of heavy rain. What are acceptable moisture levels in a subfloor? 7 Common I-Joist Installation Mistakesand How to Avoid Them Hello, I am renovating my kitchen and installing hardwood floors. A subfloor needs to be clean, dry, level and structurally sound. Houses with timber-framed floors can be at risk of having poor underfloor ventilation. Im down to ~13-19% MC near floor level, based on a cheapo moisture meters readings. With a concrete subfloor you should use a digital hygrometer, which needs to be left in place for at least 24 hours. And it's important to keep in mind that a glued-up panel behaves basically as one wide piece of lumber. Spruce isnt a hardwood so Im assuming I could get away with a shorter dry time. A 212 joist of the same species and quality can span nearly 25'. To avoid this problem, wood flooring should never be stored where environmental conditions are uncontrolled, such as garages and exterior patios. So, when looking at the relative humidity of the space, spaces left above 70% RH for extended periods will also promote mold growth. Oh no! Screwed 2x4s parallel into the joists as added support. A termite repair company (also licensed contractors) told me that I needed to replace the planks on my second story deck. We also ship to other European countries, for dryer country like Spain the EMC could be between 12 and 14. The boards have dried nicely so far with minimal warpage or checking. While playing around with my pinless meter and checking the interior East and west walls on hot days, I notice the moisture content being very high 60% mc to off scale. The different types of wet area floor construction - Level We dont know if we still should be having a commercial drying process? (As a percentage) Basically the chimney breast (in bedroom and downstairs room) has been measured with a digital moisture meter and states 'OL' on the display, the surrounding walls measure between 0.4% and 1.2%. Damn those shop classes I didnt take. As with any wood product, the environment where the finished product will Live will determine the correct moisture content. of water/day/1000 sq. Should I add a vapor barrier to floor joists under crawl space - Quora 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. Box 1088, Roseburg, OR 97470 Tel. Wonder if they are trying to cover themselves. Floor joists come in dimensional lumber lengths from 8 to 16 feet or more. Would it still be 9% for pressure treated wood? Last reviewed: 12 Sep 2021 Last published: 12 Sep 2021. Hi Larry, just finished a black Walnut dining room table back in November. What would one expect to read in plywood subfloor and old growth pine floor joist? In your area, wood that has been in an environment to a duration of time would be between 6-11%. If you need further clarification http://www.nwfa.org is an excellent source. Ceilings account for 35%, walls - 25% and windows 25%. %PDF-1.2 % Please provide us with regular updates. My plan is to make a wall-mounted headboard out of angle iron and these boards (boards will not be joined). They delivered the wood one day, and began to stain and install it over the next two days, finishing on the 6th day. My question: what is the complete saturation reading of wood? From a strictly static MC%, 16-20% MC for long duration is going to promote mold growth. Sagging or Uneven Floors Solutions. Hello Enjoyed the article. First of all, it's normal for a below-grade concrete block wall in contact with the soil to have a high moisture content. With a Wagner L606, I am getting MC readings 12%->15.5% . 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. The interior wood moisture level should be 12% or lower before painting. Or perhaps I should advise them to buy Wagner meters, for better accuracy ;-). He wants to install his companys system, seal all external openings around connections, etc. Thank you. The typical moisture content for hardwoods that will be indoors is 6-9 percent. Different joinery (currently using pocket holes)? All houses now use perimeter foundation so outside contact temperature stays at about 55 F all year. Would you be able to say anything about the optimal MC range for this specific situation? Its never constant. I live in Charlotte, NC. We have had on/off rain and humidity 80-90% range. Because ventilated crawl spaces throughout the Southeast United States allow high humidity and fungus spores to enter the enclosed space beneath the home. Your ideal MC will also depend on the outdoor humidity levels. 16% 20% Readings in this range indicate a possible elevated level of wood moisture. You can hardly see the humps except the first pier that popped up . The joists can be longer or shorter as required by space and size, and are typically spaced at either 450mm or 600mm apart. Here is a good source for mold and wood: 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..206760.0..0.100.1475.25j10.1..gws-wiz..0..0j0i131.PkfEQYRef9I. As a general guideline, an emission rate of 1.4 kg/100m (3 lbs/1000 ft) or less is considered acceptable for most floor coverings. So, is it really this wet or is our meter over-reading? Eventually, this internal moisture will evaporate by itself. 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. The next question is almost the same as before, if we have various kinds of wood, such as March wood, mango wood, pine. in other hardwood areas that wasnt close to the water, was measuring about 16-19%. . PDF Specification for Solid Timber Flooring Installation, Sanding - ATFA If any of these conditions occur, tell your installer right away. Many timber-framed floor problems can be traced to moisture levels, excessive loads or borer. A high reading in one area indicates a problem that must be corrected. Example: 1.2mm Hickory wear layer 9mm thick plywood compose of 7 layers, 2 layers acacia, 4 layers of Eucalyptus\2 layers Acacia and one layer Poplar. We will be building fir windows. Pinless moisture meters are even easier to use. Based on common guidelines or recommendations, the acceptable moisture levels for wood are as follows: Wood objects used indoors: 6-8% Wood flooring: 6-9% Construction: 9-14% Keep in mind that a wood's acceptable moisture level will depend primarily on how it will be finally used and the average RH where it will be finally used. With a degree in Computer Systems, Larry is involved in both hardware and software development of wood moisture measurement solutions. Wood moisture content is always varying. I am having a section of our 3.25 Maple hardwood floor replaced. hL this is an interesting read I landed upon as I was searching for MC in wood items. Typically, allow about 3 weeks for hardwood to acclimate in the environment. Utilize the chart on following page to record the environmental readings at the time of installation. The wood will still react in humid or dry conditions. Thats why I think the wood is either not dried to 14%, or it has picked up too much humidity after drying. Signs Of Moisture In Basement. 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. to keep the moisture content below 20 percent. Why and how can I say this? I do not have a hygrometer or a moisture meter as I am a hobbyist. There is over three foot of block above grade around the entire house. For example, if you were to have an EMC of 14%, then you would measure the woods moisture content and make sure its at 14%. This method uses the oven-dry method and then compares the results to those obtained using a moisture meter. Again, the correct moisture content will depend on the surrounding conditions. 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. Subfloor material such as plywood or OSB should measure between 10 and 14% moisture content. 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. Grain orientation matters You must be careful with a thick slab once you cut it. Your contractor may use something called a moisture meter to see what the approach should be for joist damage, or it may be more obvious based on the appearance of the wood.

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