30 Dec 2018. This is supported with netting tacked into place. Clear. You have a choice. How to apply Damp Proof Paint. The existing concrete floor can be used as a base, however a new damp proof membrane (DPM) will need to be introduced. Add to basket. Hi. Description. Limelite Easy Bond 5kg - Breathable Primer £55. For mastic asphalt, wood block and strip, and some textile floor coverings, a non-slip finish is appropriate, while thin sheet. For further help and advice with damp proofing and Liquid DPM please call our product experts today. Bostik Screedmaster Rapid DPM is a ready for use; one part, water-based damp proof membrane. Small hole dug through 2" soft sandy concrete to reveal hardcore and soil. 2. The. E. Laybond Screedmaster One Coat Liquid DPM 2 part solvent free epoxy surface damp proof membrane developed to suppress residual moisture affording protection for the floor coverings, adhesives, smoothing compounds and primers used in flooring installations. that is compatible with the self level cement i shall be using. Some parts of it are completely dry but other parts of it are still very tacky. This system reduces the need for intensive preparation and priming. This also ensures that the curing process is gradual, which can prevent cracks from forming. Wood and Beyond propose the use of vapor barrier with all. This is a solvent, water free, epoxy resin and. I see the advice is: *Primer *Acrylic Self Levelling Compound *Liquid DPM *Self Levelling Compound of choice However, I can't seem to find any acrylic based self levelling compounds. Provides sandwich damp-proof membranes for floors. The DPM may be above or below the concrete and continuous with DPC in walls and piers (See Figure 1). A DPM coating is your best option for existing floors that are experiencing dampness, as it doesn't require removing any concrete slabs. It is a highly effective membrane designed to be easy and quick to paint on (unlike others on the market). Wait until the first coat of liquid DPM is touch-dry - approximately 15 to 30 minutes at 20°C – before applying the second coat at right angles to the. 17DW400. In a case where the floor is wholly below ground level, as is the case in a basement, all walls should be tanked. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most. And yes you can level the floor after. A damp proof membrane will commonly be laid during the construction of a concrete floor in a new build to protect the floor from rising damp. 11 Aug 2022. On walls,. Complies with BS 8485:2015 + A1:2019 - industry standard for methane and carbon dioxide protection. Tile brands such as Bal, Ardex, Tops, etc all sell tile primers with fancy names ! Can simply use SBR diluted, follow instructions on bottle, likely to be 1-4 water, then apply 2 coats. Holds back rising damp where a damp proof membrane is either missing or defective. Pretty simple fix; Cons. Wait until the first coat of liquid DPM is touch-dry - approximately 15 to 30 minutes at 20°C – before applying the second coat at right angles to the. Liquid DPM to reduces the potential mois-ture related problems. 2 coats liquid DPM. USES Commonly used in the following areas: Providing sandwich damp-proof membranes for floors. We have two system recommendations for new build installations. Drybase Liquid-Applied Damp-Proof Membrane High-strength damp-proof coating for a wide variety of applications. New concrete subfloors or sand/cement screeds should be left for a minimum of seven. I need to put down a damp proof membrane and self levelling compound on top of that. Aug 27, 2017. For a self-levelling screed a system such as Flowcrete UK’s Hydraseal would be used. Walls: Can be used under render or plaster as a water barrier or. It stops around 10mm away from the internal walls in all rooms. John Lewis are correct in being very very cautious re: damp, it is critical that the prep is spot on and damp levels sorted before any attempt is made to lay the Amtico. DAMP BARRIER PAINT - A highly advanced styrene-butadiene rubber (SBR), liquid applied membrane paint. Sika primer MB or Sika-Bond Rapid DPM) or, in the case of a floating floor, a properly installed heavy-duty, non-permeable plasticThis should be a 6 foot (1800mm) level to get a proper level because it is such a big area. Liquid Epoxy Damp Proof Membrane 5kg (Metal Tin) Rating: 100%. Use polyethylene sheeting to create a waterproof membrane to ensure that there is no leakage of the screed when it is pumped in wet. Wait until the first coat of liquid DPM is touch-dry - approximately 15 to 30 minutes at 20°C – before applying the second coat at right angles to the. #5. Damp Proofing Concrete Floors With Liquid Membranes. Tiles came up very easily with zero bitumen attached. #3. It is available in black or white with a consistency similar to that of thick emulsion paint. The only way to tell properly, is to carry out a proper test. Run a string across the ground. 100m² per roll. £ 51. If there was no dpm I would suggest a uniformal distribution across the whole floor. Liquid damp proof membrane (water based bitumen) applied in several coats directly to the concrete floor with a roller or brush. 1. In contrast, a vapour barrier (VB) is fitted on the warm side of walls or roofs to stop interstitial condensation. It is supplied ready to use. A suitable gauge damp proof membrane (DPM) and thermal insulation must be provided. You can lay a fast track DPM (damp proof membrane) if your new concrete has had 2/3 weeks drying time. Our Liquid DPM (LVM Liquid Vapour Membrane Damp Proofing Paint) is a water-based ready-to-use waterproofing system supplied in an 5L tub. It stops around 10mm away from the internal walls in all rooms. If. 5kg. Plastic membrane laid with excess along the sides for lapping later. There is a membrane underneath the concrete slab which has been poured and it comes up and meets the dpc. A typical concrete floor build up that incorporates a VCL would be as follows. Vapour barriers. Primer to the surface and allow to cure. Yes, concrete is often exposed to the elements, which can cause it to crack. Blue 1. Description . My plan so far was: - fix up any cracks and dodgy bits in the current concrete floor. Prevent moisture penetration with a damp proof membrane that can be painted under your solid wood, real wood and laminate floors. Time is saved on floor preparation as the need to re-screed the floor or use a liquid DPM, the mixing of epoxies and adhesives have been removed and you don’t need to wait for. The specific liquid DPM system will depend on the type of substrate or screed. Water is added to ensure a thorough mix and to aid workability. I wanted to self-level the floor using mapai ultimate leveller 1210 and Secrete Ulitmate Primer for adhesion. 18 Dec 2013. A few floors had a DPM formed in 20mm. I will then go about levelling the floor, adding in a liquid DPM, more levelling compound and vinyl tiles as the finish. Ready to use. If a DPM has failed or perhaps was never installed in the first place, the features. 28 days or sealed when set with one coat of ARDEX HydrEpoxy WPM 300 at a coverage rate of 3. Thanks. To apply liquid epoxy DPM correctly, build up multiple coats, always follow manufacturer's recommendations and ensure that the concrete surface is free of debris or organic matter. It should be waterproof to prevent any rising damp getting through. No need for a separate primer. Suitable for extensions, basements and cellars. It helps stop moisture passing from one to the other. Prepare substrate. Now, let’s clarify some things concerning product. #4. Our Waterproof Blue can be used in showers, bathrooms, wet rooms, basements and other areas of your building that need to be protected from excessive. We have had a damp survey and it is confirmed that there is no issue with rising damp. Apply the first coat in one direction, ensuring that the material is worked well into the substrate. PRODUCT CODE: SDH0931. If the concrete floor is less than 5mm out of level, you can use a self-levelling flooring compound to even out the surface. I see the advice is: *Primer *Acrylic Self Levelling Compound *Liquid DPM *Self Levelling Compound of choice However, I can't seem to find any acrylic based self levelling compounds. The specific liquid DPM system will depend on the type of substrate or screed. Find out the benefits, advantages and steps of installing a liquid epoxy DPM for existing or new concrete floors. Once applied via a roller the compound creates a. Drybase Liquid-Applied DPM is a single-pack barrier coating that is supplied ready to use. It is true that a 100mm concrete screed will take around three and a half months to dry out (1mm per day) depending on time of year, whether a dpm or insulation was laid underneath etc, so it's a guesstimate !! In our game, dry actually means moisture levels are less than 75% so your concrete floor is only 25% dry and will release moisture for. A DPM coating is your best option for existing floors that are experiencing dampness, as it doesn't require removing any concrete slabs. Then lay a self leveller on top of this before tiling over that. I’d look up the manufacturers guidelines if I were you because if the floor warps at all then you’ll have no recourse with the manufacturers as they’ll say there was moisture present. dazlight. Chimney damp proof course (labour and scaffolding not included) £75 per roll. Barcode 5055047210603. Like x 1; List; merit Well-Known Member. Mapeproof One Coat is used on cementitious floors with residual or constructional moisture levels of above 75% RH and below 97% relative humidity prior to the installation of resilient floor coverings. The advice I was given was a liquid DPM to be put down on the concrete floor and then I will build the floor structure on top, it will be in contact with the floor via packers but the bottom layer as such will be a square of plastic to avoid. I moved into my new build nearly 2 months ago now and am having quite a few issues. Laminate uses underlayment which can cause same thing. Property is mid 1960s, solid ground floor. MS Polymer adhesive, for the DPM, please it depends on the concrete, best to contact a local flooring supplier *** Safer to apply the liquid DPM, particularly with solid wood as this has less tolerance for moisture. Self levelling compound was laid straight on top of the concrete floor (with no primer). Professional tips: how you should do it. e. It might seem a bit unusual. The most popular screed types include cement screed, anhydrite screed (also calcium sulphate screed), mastic asphalt screed and dry screed. IKOpro Synthaprufe Original is a BBA Approved (cert no. Dust, dirt, oil, grease and other contaminants should be completely removed. Sika Code 175129. Liquid DPM and waterproofing paint to waterproof and damp proof your property. Liquid DPM and waterproofing paint to waterproof and damp proof your property. Impatience and damp concrete subfloors. !! 2 Coats is good - 3 is better still. 16. Description. Produced from Recycled Material. If I put a damp proof membrane down first, like a paintable one like Wickes paintable bitumen or Drybase Dpm in white, would products like this work under self levelling compound? A liquid DPM such as Bostik Cempolatex Moisture Suppressant must be applied in two coats. @Joe87 there are surface applied liquid dpm products available that you could use on top of that floor which would get rid of the issue of rising moisture affecting the new timber floor. Ideal for general waterproofing and fixing. Browse damp-proof membrane products from Toolstation here. For further help and advice with damp proofing and Liquid DPM please call our product experts today. and finishing the concrete floor to acceptable standards is impracticable. Protects the floorcovering from residual construction moisture and ground water vapour. The DPM we use does not cancel all moisture out as this will end up. Drybase 2mm Plaster Membrane Mesh (2m x 20m) - Low-Profile Plaster Membrane For Use on Damp Walls. Which type of coating is chosen will depend on the intended use of the floor. It is often used. Visqueen High Performance Damp Proof Membrane. Many damp-proof floor coatings are used directly on the concrete floor surface with a roller or brush. Jul 13, 2011. I spoke to Everbuild/Sika and they were able to recommend a DPM paint and compound that would bond together, by priming the final layer of dpm. I’m concerned about the self levelling compound for a garage , it’s hygroscopic and may get damp from the cold floor . The booklet covers topics such as joint isolation, thin set tile, termination, and utility finish. It provides a dry barrier against moisture and can be painted over with resin-based coatings or overlaid with other floor coverings. 2. Basements: As part of a waterproofing system beneath ground level. Apply around the edge of the room using a paintbrush, and then use a pre-wetted short. £100 - £600. It can be applied to damp floors and maintains excellent adhesion. Sussex. Test Area Because of the wide variety of possible substrates and site conditions, it is always advisable to check adhesion to the background by testing on a sample area before starting any job. Provides a flexible and resilient barrier to penetrating damp on walls and floors. Virtually solvent free liquid epoxy resin damp-proofer. so the whole floor is 25mm lower and then just use a self-levelling compound Pros. and then apply a second coat with kiln. For a self-levelling screed a system such as Flowcrete UK’s Hydraseal would be used. £36. When using as a liquid DPM make sure the substrate is load-bearing, and that any laitance is removed mechanically (common on new concrete floors/screeds). The damp proof paint is now ready to be. PermaSEAL Liquid DPM can also be applied to concrete floors below screeds. Can be over painted after 16 hours with most types of floor coatings. A liquid-applied DPM (damp proof membrane) is a simple solution and an excellent way to damp proof a concrete floor. These can over time allow a build up. As Glueman mentioned, the original bitumen glue would likely have been thought of as partly a DPM, when i am doing parquet block repairs to concrete floors which have a bitumen residue left on it, i apply 2 coats of a liquid dpm, either Lecol PU280 or Sika Rapid, both are superb products and 2 coats is normally enough to form a. Ask your plasterer to leave a 20mm gap between the bottom of the board and the floor which can then be filled with expanding foam. Can be used where a structural DPM is not present or is ineffective. Epoxy Damp Proof Membrane Epoxy damp proof membrane is a coating that suppresses residual moisture in cement and concrete floors to speed up the process of installing floor coverings. 19. Liquid epoxy DPM is often used as a remedial solution for existing concrete floors, as it creates an impermeable layer that keeps water in the concrete slab. I would advise a single part flexi tile adhesive on top which will enable you to have stone, ceramic or porcelain tiles fixed. Its wrong. 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,. Hello, hoping someone can help. #2. One high build (250 microns) coat is usually sufficient. GaryTheTiler said: Sound like you don't have a damp membrane under the concrete or a leaky pipe under the floor perhaps. Covering the concrete with plastic can help to keep it cleaner and stop it from cracking. It might seem a bit unusual. Shake the liquid DPM container well before use and pour the product into a mixing tray. The black layer is possibly the adhesive from the previous floor such as thermo plastic tiles or parquet. It is available in clear. T ·Öà 4. Don't use a bitumen at all, you are correct eventually your screed will fail. 18 Aug 2023. Chemical damp proofing cost. 30mm. However we have limited headroom in the kitchen so I wondered if a thin layer of the self levelling compound would suffice to lay a new vinyl floor, rather than go. 00 € 60. • Solvent Free, Low Odour. Most important thing here is to prime the bitumen and concrete repairs to get a good bond between tile adhesive and floors. Joined 22 Jan 2007 Messages 15 Reaction score 0 Country. Damp Floor: If your floor has RH readings above 75% and below 95%, with a functioning structural damp. A vapour barrier, on the other hand, is a damp proofing product attached to a wood floor underlay to reduce moisture passage. 40 inc. Good afternoon. Use 1000 gauge or thicker – ideal for this is the polyethylene use for the DPM under your concrete subfloor. So I have a concrete floor in the kitchen (concrete - DPM - 50mm screed), knocked through into the outside toilet which just had soil floor. Liquid damp proof membrane For existing concrete floors, you can also apply a liquid damp proof membrane, which provides a retrospective damp proof membrane. Add to Basket. Discover important FAQs including what is liquid DPM, what is the best liquid DPM and more. If a screed such as A38 or Topcem was used, this can reduce the drying time, and with A38 this can be just one day. case of un-bonded screeds. The DPM we use does not cancel all moisture out as this will end up. Looking lay a liquid dpm in the cellar floor followed by a self levelling compound as it uneven. £51. Laitance must also be removed from concrete. so what liquid dpm should i use. How do you install a damp proof membrane on a concrete floor? Do I need liquid DPM? Testing the Floor’s Moisture Level The Resin Flooring Association (FeRFA) guidelines stipulate that a DPM will be required if there is more than 4 grams of water per cubic centimetre passing through the substrate in a day. After removing 6 of the tiles, I can see that this bituminous stuff is peeling away with some of the tile adhsive, and so Im guessing its gonna. Liquid DPMs gave the best protection but were more expensive. Protects the floorcovering from residual construction moisture and ground water vapour. General waterproofing: - for use on concrete,Liquid-Applied Membrane. rogerk101, Mar 13, 2020. This is a solvent, water free, epoxy resin and moisture tolerant curing agent that allows for immediate installation of moisture sensitive floor finishes onto concrete and. Damp-Proof Floor Coating. Drybase Liquid-Applied DPM, Drybase ECS Epoxy Floor Coating, and many products from the Vandex range including Vandex BB75 and Vandex Unimortar 2 can be applied directly on to damp floors to form a damp-proof barrier. I need to put down a damp proof membrane and self levelling compound on top of that. you need to dig up the old concrete then lay a couple inches of sharp sand. 41. underneath a screed or self level we. I don't want to puddle any DPM into these holes but does anyone know the best way I can 'fill' them before putting down the DPM. Step 3: Lay the watertight membrane. We have had a full structural survey done which highlighted damp at the ground floor level. Odourless, rubber-enriched bitumen emulsion. e. Self Leveling OverlayFind the overlay to meet your project's needs. Can be used where a structural DPM is not present or is ineffective. #2. It should accommodate 0mm to 5mm (or thereabouts) It will cover an area of 26m2 (4m x 6. Features. Capital Valley Plastics Ltd Damp-Proof Membrane Black 1200ga 25m x 4m (47163) (55) compare. Assuming that the damp proof membrane (dpm) under the concrete has failed in areas then yes you possibly would get the odd patch of dampness showing in the floor. I am looking for some advise about laying a SLC with a liquid DPM. 2020-05-24T11:35:02+01:00 Answered 24th May 2020Liquid DPM. To remove this type of asbestos containing floor. This can only normally be guaranteed if its an new build or extension and most houses have been sold, inherited etc. Bit confused with all the different products and combinations though. Mark El-Kadhi New Member. The DPM membranes are available in 4M x 25M rolls as well as a handy pack ideal for smaller jobs. If in doubt check the moisture content of the concrete. In subfloors with readings in excess of 75% relative humidity (RH), the use of surface membranes will suppress residual moisture, which can dramatically shorten project schedules. Thin Micro-ToppingProduces durable surface to color or stain. Technoseal Floor DPM. Membranes. Answered 22nd Aug 2016. I'm looking for opinions on the best self leveling screed to use on my slightly wonky concrete garage floor. 7,856 1,619 113. How to do Damp Proof Membrane of your sub-floor. I have an uneven concrete floor inside. Standard sand & cement screed, dries at approx 1mm per day, depending on variables. The lower sand ratio means a higher ratio of cement, which gives a stronger mix. Damp-Proof Floor Coating. RonaScreed DPM is also suitable for use prior to the application of tiles, soft flooring or wood. This is a belt and braces approach to prevent any part of the floor coming in to contact with the wall. I want to ensure the up. Once applied, it cures to form a flexible and elastic membrane that. Sika Waterproofing Overlap Details SWOD - CAD Booklet is a PDF document that provides detailed drawings and specifications for various waterproofing solutions by Sika, a global leader in construction products and systems. If you need some advice on what DPM your floor project will require you can speak to one of our flooring experts using the live chat (when available) or call us on 0333 533 3330 during normal office hours. When stripping the bathroom, the area under the bath tub was bare concrete, lower than the rest of the "black" floor throughout the property. RonaScreed DPM is a liquid applied surface damp proof membrane designed to reduce the passage of water vapour and allow the adhesion of thin bonded and fast drying screeds to concrete which is either not fully dry or does not have a functioning DPM. Option 3 – Apply a liquid DPM. DIYDave. And damp can rise through it if not used. Use polyethylene sheeting to create a waterproof membrane to ensure that there is no leakage of the screed when it is pumped in wet. There are also dimpled underlay mats that disperse any moisture to the edges of the room but I have less experience of those. The installation of a liquid damp proof membrane can be a vital step in the building process, for both refurbishment work and for new builds where a structural damp proof membrane may be. It is available in black or white with a consistency similar to that of thick emulsion paint. I have an uneven concrete floor inside. Country. The black "rubbery stuff" could well be a layer of bitumen which was used as a form of DPM in houses from around (AFAIK) WWI period or a little earlier up until the 1970s in some areas. I'm fairly certain the bathroom was actually an outhouse or a brick shed and the main house was extended to join up with it. The calculator helps translate the CO 2 savings into concrete terms such as the annual emissions from cars, households or the amount of CO 2 sequestered by trees. Free from water and free from solvents, this primer allows for a trouble-free installation as no swelling of the wood is to be feared. Withstands 98% RH. water will be likely to collect between the DPM and the old floor. A flexible and resilient barrier to damp on walls and floors, this product is a rubberised, bitumen based emulsion that can be applied to concrete floors as an alternative to. DPM Membranes for Concrete Floors ; Damp Proof Course; Damp Proof Paint; Rising Damp Treatment; Water Repellents; Vapour Control Layers; Internal Waterproofing;. Whoever did the repair once the fireplace was taken out didn't bother putting. 21 May 2010. Pumaprime DPM - a solvent-free liquid applied surface DPM for concrete floors. We have purchased a 4 bed detached house built in the 1950's. These can over time allow a build up. This enables earlier access onto the floor for the application of screeds, coatings and other floor coverings including tiles, vinyl, wood and carpets. Dri-Wall DPC Injection Cream. Our products are all carefully selected by our in-house experts to provide the highest level of protection for your property. the DPM and new floor can then go on top of this. Description. LAC is typically used as a damp proof membrane to ground floors, as a vapour barrier behind cladding and for tanking of basements. An MVS, is a moisture vapour suppressant that is used on floors, usually concrete or cement-based screeds with up to 95% RH. Drill then fix the damp proofing membrane to the walls ensuring a tight fit. It should be waterproof to prevent any rising damp getting through. OR. The floor is old concrete and dips ~25mm in the middle. It helps to prevent damp and moisture from entering the building’s structure and interior. 15 m2 1. Don't use a mix of manufacturers products because if you asked for a site visit due a failure, they'd automatically walk away. rogerk101, Mar 13, 2020. Solid wood should be laid on top of 3/4 ply first as differing. Proposed floor is pitch pine boards secret-nailed to 2 x 2 inch battens with insulation between, onto a concrete floor not known to have a DPM under it; therefore, DPM to go under the battens. Chimney damp proof course (labour and scaffolding not included) £75 per roll. weberfloor DPM can be applied on substrates such as concrete and cement-based levelling compounds. Drybase 2mm Plaster Membrane Mesh (2m x 20m) - Low-Profile. Can also be used as a general purpose coating for surfaces subject to foot and light wheeled traffic. 100% solids, high build coating. where the ground was uneven or where there were soft spots below the slab, it might be reinforced with a mesh. 2,940. Plenty of cement/latex/fibre. It is also to prevent the liquid screed (to be. Liquid epoxy DPMs are ideal for concrete floors, such as garages, where the original damp proof membrane is missing or has broken down. ARDEX offers a range of liquid or surface Damp Proof Membranes (DPM) to protect the floorcovering from residual construction moisture and rising damp, when a structural. A liquid DPM such as Bostik Cempolatex Moisture Suppressant must be applied in two coats. BS recommends (Annex A) hygrometer test which should give a reading of not more than. PermaSEAL Damp Proof Paint 5L. . The subfloor is a solid slab that is mostly level (although in parts, just earth). I am assuming its asphalt with a bitumen top layer, 10-15mm thick. The DPM should: have sealed laps of at least 300mm wide. With a consistency similar to that of thick emulsion paint, it's suitable for use on solid floors, embedded timbers and walls. Applications. Unsmooth subfloors If the subfloor is uneven, the WSM could ‘pool’ in any undulations on the surface and will require a greater quantity of WSM to achieve full coverage,. The VPU-155 S is a versatile primer easy to apply by either trowel. The vinyl being laid before the concrete has dried out. Side extension refurb: old concrete slab is uneven with a line of about 10mm difference in heights down middle, and dpm under screed is visibly not 100%, with a few gaps. John Lewis are correct in being very very cautious re: damp, it is critical that the prep is spot on and damp levels sorted before any attempt is made to lay the Amtico. If there was no dpm I would suggest a uniformal distribution across the whole floor. In particular, this can include permanently damp concrete floors or where the DPM (Damp Proof Membrane) is. Slimline floor membranes, on the other hand, are quick and easy to install and create an air gap that allows for finishes to be applied while the damp floor is still drying out. A: A damp proof membrane (DPM) is a thick plastic sheet used as a waterproof barrier between a concrete subfloor and wood floor. #3. 3. Tanking and waterproof render up to a metre high will help, alternatively, do what they did 100 years ago. After the final application of EP40. Self-leveling concrete can be used as an underlayment for tile, carpet, or other floor coverings. Made from recycled materials. £36. We have become a bit obsessed with checking the dampness so bought our own damp meter suitable for checking concrete,. 21 Sep 2016. [email protected] Nov 2016. Doesn't cover the transition from the concrete floor to the wood floor; Hugely expensive and money I don't have. From below, installing insulation to improve the floor or as part of a basement insulation project is fairly straightforward. DIY Concrete Floor: Pouring Slab 3/3. If the coating is not going to be the final decorative surface and a. To be honest it’s worth having some sort of moisture suppressant put down just to make sure. Walls appear to be dry & are mainly concrete block. co. It is also suitable for waterproofing foundation walls, ducts, lintels, columns, beams and similar structures at, above and below ground level. EITHER. To use an MVS, there must be a fully functioning structural DPM in. 1. Screwfix Select. Speak with a technical adviser if unsure. There is no damp proofing on the floor. 99 Inc Vat. The concrete floor might only be 6 years old but theres no way of knowing if the DPM underneath was. For RH readings above 75%, the subfloor must be left to dry out further. Day 4, move all your stuff back in (could do this day 3, depending on how fast your chosen compound goes off). 00. Self Leveling OverlayFind the overlay to meet your project's needs. Country. 5kg. then a liquid dpm will need to be used as well as a 3mm thick latex layer as most adesives wont bond properly to the dpm. #1. I have an uneven concrete floor inside. I’d like to install a liquid DPM but currently have an existing screeded concrete floor that sits above the DPC.