A vessel that is fifteen years old now should still be sailing, motoring and giving enjoyment to owners and crew in another thirty years time. This emphasises the importance of the difference between the HMC and MC measured on samples"Nowhere in that Digest is it written or do they maintain, especially after damp-proofing works:* A moisture content of less than 5% is perfectly acceptable. We have a two level old row house with a brick wall. In unconditioned spaces indoor humidity levels reflect the atmospheric conditions and this combined with moisture created by occupants’ activities means that many buildings may be susceptible to mould. Providing adequate ventilation is a key step. This disadvantage can be overcome by use of a Salts Analysis Kit. Subsequently, one may also ask, what is an acceptable moisture readings? To keep exterior wall systems functioning properly, moisture must be prevented from infiltrating into and through the wall system; otherwise, it can cause mold and other biological growth to proliferate. The use of an electrical moisture meter may be used to measure the moisture content of a wall Put these two materials side by side and subject them to an unlimited amount of water then it becomes quite clear that the bonding plaster could hold in excess of 20% yet the brick could only reach a maximum of 6 - 7%. posted 2014-Aug-5, 10:21 am AEST ref: whrl.pl/Rd2XK4. If you don't have a mold or mildew problem I don't see anything wrong with hanging clothes to dry. posted 2014-Aug-5, 10:21 am AEST O.P. * A wall must have in excess of 5% hygroscopic moisture content before it has rising damp. Interpretation of '5%'There is nothing wrong with the contents of the Digest as it is actually written. Click to see full answer. Ideally you should mount the dehumidifier on the wall above the window to make draining easiest … and don’t worry about winter, as then you need a humidifier to add water. With a gypsum scale meter, users can simply stick the meter in the drywall and activate it. Combating Mould. • Even though this wall passes by the new mold criteria, OSB structural property degradation has likely occurred (and may be progressing) due to high moisture content cycling. At that point apply a coating of epoxy, there’s lots to choose from so do some research. Reply. The figure is referred to in a couple of paragraphs in the section on page 4, "Interpretation of results":-"If the found moisture content (MC) is less than five per cent at the base, it is unlikely that the wall is severely affected by rising damp." Generally speaking, for drywall, a safe moisture content (%MC) would be less than 1% MC. Here 100mm of polystyrene was the internal wall insulation used. Website Design & Hosting by WebWise Search. Similarly, if the moisture content in such a material is in excess of 5% then some action may be considered. Looking for Signs 4. Concrete slabs and floors can be excellent subfloor surfaces for tile and other floor coverings, but too much moisture in the concrete can cause problems with flooring installations. This makes it quite clear that one cannot directly compare the moisture contents of Relative moisture contentsdifferent materials: this is a common error! movement, cracking, fungal attack, chemical reaction, are initiated and aggravated by the presenc… The problem which formerly prevented a purely instrumental diagnosis of causes of damp is the effect of salts in the material: Salts left by rising damp, by penetration of water from an old flue, or by leaching out of old walls over many years can cause an electrical moisture meter to over-read the moisture level. This is a problem usually associated with new buildings caused by: Filling in the cavity above the level of the damp proof course e.g. You can buy an. You know that gypsum is a common raw material used for construction and it is very sensitive to water. Joomla! According to the the U.S. Green Building Council's Green Guide, moisture levels in a home should remain under 50 percent. Pinless meters are especially useful for assessing water buildup behind showers, bathroom tiles, and other finished surfaces. When used in other materials it can only record the presence of surface moisture and is unable to determine the true moisture content existing below the surface, i.e. the bathroom in the loft. Digest 245, "Risingtmc=hmc+fmc damp in walls: diagnosis and treatment", covers the same ground as the TIL but adds extra explanation relating to rising damp, distribution of moisture, and interpretation of results with special emphasis on determining the difference between total moisture content and hygroscopic moisture content; it also discusses treatment of rising damp and performance of injection damp-proof courses. Eventually, spalling can cause large sections of the masonry to crumble and fall off, potentially leading to structural damage. If the 1 location that gets wet gets worse or larger some exterior work may be needed to get the water away from the wall. Exterior walls may use a variety of materials, from wooden siding, to vinyl, aluminum, brick, and stone. The most common reason for paint peeling though is when the trim is not installed properly. Generally speaking, for drywall, a safe moisture content (%MC) would be less than 1% MC. "There's less than it 5% moisture content in the wall - the damp-proof course is working perfectly"How many times have we heard this statement? Excessive moisture also results in wall rot, an extremely unsig… With the levels you have listed I would not worry at all. Whats an acceptable moisture level for a brick wall in a house? A reading of up to 17 percent is generally considered moderate moisture and acceptable. dsn19. Acceptable moisture levels in concrete according to ASTM standard, when testing via ASTM F2170, the RH level of a concrete slab needs to be at or below 75% — unless the flooring system manufacturer provides alternate guidelines. Clearly, such statements do not form part of that Digest. The original contractor is called back and he too gets high moisture meter readings. And just in passing, hygrosopic salt contamination sufficient to cause HMC's in the order of 5% is pretty heavy and under some conditions probably sufficient to cause the material to appear damp solely as the result of their contamination!It becomes very clear that those 'quoting' the Digest have not actually read it properly: they report only what they believe it contains, or more likely what they have heard it contains. All Rights Reserved. Solution to a Drafty Brick Wall. This article focuses on moisture in liquid state that infiltrates the wall from the exterior and migrates toward the interior. Other 'additions' to the DigestAnother 'spin-off' from the 5% figure has just become evident. While relative humidity can have some effect on moisture levels, drywall is considered to have an appropriate level of moisture if it has a moisture content of between 5 and 12%. I may occasionally say the readings are ‘excessive’ or ‘acceptable’….use your own thesaurus for equivalents. This phenomenon, commonly known as spalling, is caused by excess moisture in the masonry that exerts pressure outward. Ongoing Care 10. Example A timber skirting which records a moisture reading of 12% (air dry), the plaster could be around 0.5% and the brick about 1%. Archive View Return to standard view. Hi Tina. What are the relevant parts of the Digest which relate to 5% in masonry? Effectively in the above quote the hygroscopic moisture content is irrelevant to water ingress arising from rising damp - the importance is the difference between the MC and HMC (ie, free moisture) as described in the BRE Digest above! The acceptable moisture content in wood depends on two factors: The wood’s final use. And 5% in a material that can only hold say 8% (63% saturated) is probably not acceptable. Try to place it on an exterior wall near a window where you can run a hose outside to empty it as getting rid of the water can be a challenge. However, it does show how they may be used to determine total moisture content and hygroscopic moisture content of materials, i.e., a full moisture analysis. The walls should be re-plastered with a waterproof render and skim. Zero moisture is unrealistic -- even wood used to frame a house contains some amount of moisture. When water enters brick, concrete, or natural stone, thermal expansion can cause the surface to peel, pop out, or flake off. It can be seen that knowing the percent moisture content of a building material (other than wood) does not tell you whether that material is wet or dry. I would like to know if a reading of 28% is exceptionally high or if it's acceptable. With unwanted moisture intrusion, masonry units and mortar can crack. Our contractor recommended pointing and sealing the exterior brick, which we did. Bryan. Accurate measurements of the moisture content of brick or mortar cannot be obtained by the use of electrical moisture meters because the presence of salts increases the electrical conductance of the water, giving falsely high readings. Well-Constructed drywall should have a moisture content below 1% and that is why if the amount of moisture ranges from 0.1% to 0.2% drywall scales can detect it more accurately. * For a wall to have rising damp and it must have a moisture content in excess of 5%. In fact the exact moisture content is rarely important; 3% may be excessive in one type of plaster/brick and be acceptable in others… Thank you for looking in, I hope the article helped you. Remedial Actions 2. Poor bricklaying practice is a common cause, but footing movement which creates cracking or defective flashings may also be problematic. as a solid (ice, snow); liquid (wind-driven rain) and gas (water vapour). With a cold slab, you may experience a low level of vapor transmis-sion from a moisture-laden concrete struc-ture. Well-Constructed drywall should have a moisture content below 1% and that is why if the amount of moisture ranges from 0.1% to 0.2% drywall scales can detect it more accurately. Our living room reading is 28% and we are currently having three walls taken down, a damp proof course put in and the walls replastered. Accurate measurements of the moisture content of brick or mortar cannot be obtained by the use of electrical moisture meters because the presence of salts increases the electrical conductance of the water, giving falsely high readings. Anything above 1% MC in drywall would indicate a level of moisture that could compromise the integrity of the gypsum board. In one particular report it was stated that if the moisture content is not brought down to below 5% after damp-proof course injection then the damp-proof course has failed. In severe conditions you may see higher readings of skirting 22%, plaster 1% - 3% and brick around 2% - 5%. 1.1: This Guide describes common field methods for the determination of moisture content in painted and unpainted exterior concrete and masonry walls (CMU, brick, stone [manufactured and natural], poured-in-place, pre-cast, and tilt-up), Exterior Insulation Finishing Systems (EIFS), stucco, and concrete and masonry ceilings (panels, planks and cast-in-place). 1.1: This Guide describes common field methods for the determination of moisture content in painted and unpainted exterior concrete and masonry walls (CMU, brick, stone [manufactured and natural], poured-in-place, pre-cast, and tilt-up), Exterior Insulation Finishing Systems (EIFS), stucco, and concrete and masonry ceilings (panels, planks and cast-in-place). In most cases this will bring the moisture content down to acceptable levels. The speedy chemical moisture meter gives a quantitative reading of the total moisture content in masonry. If you really must quote the readings then the modern accepted parlance is to use the term Wood Moisture Equivalent (WME). For saturationexample, bonding plasters can hold well in excess of 20% moisture before they become saturated whereas a dense brick may only hold around 6 - 7% before it too is saturated; neither can hold any more water because they are both saturated. Exterior walls may use a variety of materials, from wooden siding, to vinyl, aluminum, brick, and stone. These electrical moisture meters can only be used to accurately assess the level of moisture in timber as this is the primary task they were designed for. Moisture content in solid brick walls moisture reading step up group moisture levels in wood moisture content in brick walls moisture content in brick walls moisture meter to detect damp. Read our. last updated – posted 2014-Aug-13, 7:31 pm AEST posted 2014-Aug-13, 7:31 pm AEST User #645831 2 posts. THIS is the culprit - a piece of electronic gadgetry that does NOT measure water content - it measures conductivity. Wood moisture scale (wood moisture equivalent 'WME') is the most common and is recognised by professional bodies.
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