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 the home feel unclean and uninviting. Damp affecting Concrete Floors. A damp proofing concrete floor solution is particularly important. These problems are not only disrupting functions of the building due to maintenance operations but also costly. Mysteriously enough, even if you do not have bare concrete floors and you have carpet, tile, vinyl or wood flooring, moisture and condensation can still cause Sweating Slab Syndrome with temperature fluctuations. Why is the concrete floor under my carpet soaking wet? This is not actually a problem with the construction, however, but an issue that can often be controlled or eliminated by changing the upkeep of the area and, in some cases, the controlled climate conditions. Concrete floors especially can create problems that can be more difficult to solve. It is important to remove the damp smell and prevent it from coming back. The main purpose of under-floor waterproofing membrane is to prevent rising damp from entering concrete or other floor surfaces. If you have carpeted floors, search for areas that look darker or are unexpectedly damp. However, when it comes to concrete, the appearance isn’t quite so attractive, so you’ll want a more attractive floor covering instead. However, typically these are often fairly thin and are sometimes damaged even before they are laid. Damp concrete can lead to mildew and mold on the underside of the carpet or wood. Ideally you need to take it up and redo the entire floor, alternatively as was mentioned, paint it with a waterproof material. In this case damp air from the under floor area came through the floors and floor coverings into the rooms and eased the dampness under the floors. It will work up to point, trouble is it will 'sweat' under the dpm so it will be soaking underneath. This barrier is intended to stop moisture passing from one to the other. Its got a bichumin type paint over it.? After taking up the plastic chair mat under a desk chair, the carpet is wet. Effectively, a damp proof membrane (DPM) is used to create a barrier between a concrete (or screed) subfloor and a wood floor. Underfloor heating is well suited for use under carpet, provided that care is taken when choosing the carpet.The overall thickness of any materials above the heater needs to be taken into account too, as this will ensure efficient heat transfer. Concrete floors are susceptible to rising damp through the same capillary process as walls. I pulled back carpet and underlay (laid only 3 years ago) and notice that the concrete floor looks damp and the underlay smelt damp. For example, black […] Installing carpet over a basement concrete/cement floor can be a simple project and requires very few tools to accomplish. The floor has got soaking, I've just lifted the carpet and it's wet and mouldy underneath, what would cause this? Within a week or so, the "damp spot" progressed to a puddle 4 by 6 feet that a wet vac couldn't really keep up with. Wash the concrete with a bleach or TSP answer first to kill the mildew. Slab leaks create water build-ups underneath your concrete foundation. Water can leak through windows or roofs, but it can also damage the floor from below if the crawlspace is often damp. Damp in concrete floors are much more difficult to treat than having damp walls. This is because damp rising up through concrete floors is a pretty common issue. It's also a very slippery material so it's likely the carpet will slip all over it. Concrete is a naturally very porous material and water can rise up or travel through capillaries which can lead to damp floors and mould issues. Any floor that remains damp or wet for more than a day may grow mold. RADIANT FLOOR HEATING WITH CARPET. The damp-proof membranes installed in concrete floors to stop moisture rising through them can be ineffective. The reason for this is that concrete is a very porous material meaning that water can rise through capillaries and therefore lead the property to suffer from having damp floors. Damp rising through concrete floor slabs is fairly common, causing damp issues on carpets and floor coverings, warping wooden floors and increasing the likelihood of low-level mould growth. 3. If the walls and floors in your home and basement look clean, be prepared for a thorough inspection of the carpet. Ideal for use in: Living Rooms Dining Rooms Bedrooms Stairs/halls Our Damp Proof Membrane provides an additional barrier protection between the sub floor and the underlay preventing moisture from rising up into the wood/laminate floor covering and damaging it.  We were re-plumbed a few years ago so there shouldn't be an active pipe there, but this room is next to a bathroom. Here we tank a concrete floor that has no physical damp proof course. Floors can easily suffer from moisture ingress otherwise known as penetrating damp. Therefore, it is recommended to implement necessary […] Carpet provides elegance, warmth and comfort but can be complicated to lay directly over concrete […] Carpet Underlay for Concrete Subfloor. Damp proof membranes are routinely used during the construction of a concrete floor. The second, and most likely being a basement flat, is that the damp proof membrane in the slab (floor) has broken down, allowing moisture to travel up through the slab and cause a problem. Concrete flooring can sometimes accumulate a damp smell. Answer Save. Damp proofing concrete floors isn't terribly difficult, although it can be time-consuming and confusing. Any moisture that does reach your carpet can cause it to become moldy and start to rot. A damp proof membrane (DPM) is used to create a barrier between a concrete (or screed) subfloor and the floor covering that is laid on top such as wood, ceramic or quartz tiles, laminate or carpet. They are produced in varying degrees depending on the species of mold that is present. In commercial applications, when carpet, wood, or vinyl flooring is installed over damp concrete, moisture creates real havoc, since the dampness and high alkalinity will lead to mold, emulsified adhesives, and warped flooring (see Flooring System Failures: How it Happens, from W.R. Meadows). As such, it’s vital you seal your concrete floor properly before laying any carpet. In principle all concrete floors should include a damp proof membrane across the whole floor area and this should be linked to the damp proof courses in the surrounding walls to provide continuity of protection against ground moisture. Damp proof membranes (DPMs) can be used to help resolve damp issues which already exist or to avoid damp or moisture problems in the future. With carpet, there is much more choice as you aren’t limited so much by the thickness and a damp proof membrane isn’t essential. What you do relies upon on how enormous the area is.  Not damp, but wet. How to Keep Wet Carpet From Molding. But there are other factors to consider, such as the room or area of the home that the carpet is being laid. Commonly, concrete floors are vulnerable to moisture and suffer from different detrimental influence of moisture such as lifting tile off the floor, rotting hardwood, damping carpet, coating delamination and many more. Mold under your carpet and on concrete can cause serious damages to your health and property. Wet carpet can be a perfect breeding ground for mold, especially if the air is humid and the water remains in place longer than 48 hours. Some types of flooring are naturally beautiful, giving the option to leave the surface exposed without sacrificing any style. Many carpets and carpet padding are vapor-permeable, so if your concrete basement is showing moisture, it can continue to evaporate up through the pad and carpet. Therefore, it's advisable to have a floor tested for moisture content prior to installing flooring or moisture barriers. Why Mold Is Dangerous/Toxic Mold is hazardous in various ways, but mostly because it produces and disperses mycotoxins into the atmosphere. Often found in basements and garages, the unpleasant floor smell can emit throughout the entire house. To escape, this water may pool on top of your floors, yard, or the concrete itself. I even put a piece of kitchen roll under the underlay but it REALLY smelt when I took it up after just a few hours. I cleaned it off, dried the floor with a hair dryer, hoping this would solve the problem. I have a window ac unit in my bedroom and, at first thought it was leaking into the wall/floor somehow. Wardrobes in these two both had damp concrete/carpet. If you notice that your carpet is damp, the cause may be a leak from the floor underneath. This scenario occurs mostly in basements. Damp Carpet. Many viewers ask if they can put carpet over a concrete floor.  What are the chances this is a result of moisture in the carpet from a cleaning over a year ago versus a leak in the slab? If left unchecked, the mold can spread to the walls and create a mold infestation that is not only dangerous, but also costly. As I would have thought the paint would have sealed any damp from coming up underneath the floor? I ripped the carpet off and noticed that the exposed concrete slab is also damp. Users have the option of choosing black or green sheets or co-extruded membranes with one side in black and the other side in green. mildew would not eat concrete, notwithstanding this is obtainable pourly put in concrete will be porous and also enable water vapor less than the slab emigrate by the slab and collect on the bottom of the carpet pad. If you have concrete in your home that routinely appears to be wet or feels damp, then you may have sweating slab syndrome. … Fixing Subfloor Under Carpet: Demolition There's no way to fix the subfloor under carpet without pulling up the carpet. What I'd recommend is that you buy a 100% Olefin carpet roll end at any retail flooring store and use double sided carpet tape to tape the perimeter of the carpet down to your concrete floor. Look for pools of water, damp carpet, or warped wood floors. In addition it prevents contamination of concrete during the pouring process. Upon closer inspection, the carpet on the floor of the wardrobes were wet! The temporary fix was to rip up the carpet, knock a hole in the concrete slab, repair the leaking pipe, fill in the hole with quickcrete cement, and restretch the carpet … Without an underpad under the carpet, any moisture that accumulates under the Olefin carpet will simply evaporate through the carpet. 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