marginally exceeds 70%, a liquid damp proof membrane (DPM) is required. There is a DPM under the concrete as well, but primarily to keep the water in for curing. Ground-bearing concrete floor slabs should be protected against ground moisture by providing a continuous damp proof membrane (DPM). A competent contractor with pumping equipment and knowledge of the screeding process. So I have a block and beam floor which is 150mm below existing floor level. You only need one coat when used in conjunction with our MS Parquet adhesive. It is supplied ready to use. Alternatively, liquid DPM solutions based on reaction resin systems which can be applied on top of the substrate to control moisture up to 98% RH. 1. 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. £750 - £3,000. F78 Stopgap 1 Coat Rapid STOPGAP F78 is a solvent free, one component, ready to use system which dries rapidly to provide a waterproof surface membrane. the only issue you will have is when driving into the garage consider the floor although not level pretty flush with entry. ft. Liquid DPM and waterproofing paint to waterproof and damp proof your property. Iam a floor layer with 25 five years experience. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most. rogerk101 said: ↑. Ready to use, ultra-quick drying, flexible liquid membrane for internal and external waterproofing applications. floors. £9. The build up of a ground floor would typically be: DPM, Slab, Insulation, Vapour Barrier, Floor Screed. 175129. It is available in black or white with a consistency similar to that of thick emulsion paint. Suitable for all areas of a home, DPM is available in a choice of fabric and liquid forms. The specific liquid DPM system will depend on the type of substrate or screed. This DPM is normally created by the installation of a polyethylene or bituminous sheet within / below the main substrate structure. Joined 22 Jan 2007 Messages 15 Reaction score 0 Country. It is not suitable as a bond. For Interior & Exterior Use. This damp proof paint is supplied in 5 Litre containers, available in White or Black. Country. 8 Apr 2013. Suitable for the damp proofing of interior masonry wall surfaces. Liquid-applied membrane (LAM) is a monolithic, fully-bonded, liquid-based coating suitable for many waterproofing and roofing applications. A damp proof membrane is primarily used on solid material floor constructions and it is designed to act as a waterproof barrier, preventing moisture from travelling into other. Pot life: approximately 20-30 minutes. It is not suitable as a bond coat on walls where Drybase® Flex Membrane or. Especially suited to refurbishment projects where old adhesive residues are present. Covers approx. It is used to suppress residual moisture in concrete and sand/cement screeds allowing early installation of floor coverings. Solum Treatments The solum of a property is the subfloor base of the property (level under ground floorboards). SikaBond® Rapid DPM is a single part moisture curing polyurethane. BAL DPM is resistant to water, chemicals, grease and pollutants, and can be used internally or externally either as a DPM, primer, waterproofer or residual m. An ARDEX Damp Proof Membrane will protect the floorcovering installation from residual construction moisture and ground water vapour, where readings of up to 98% RH are measured. It, therefore, prevents moisture build-up beneath vinyl or other floor coverings. £30. Drybase® Liquid-Applied DPM is a single-pack barrier coating for above ground use. Chimney damp proof course (labour and scaffolding not included) £75 per roll. May be blended with quartz sand (while tacky) to create an anti-slip surface finish. kez, Apr 22, 2019. Visqueen Liquid DPM is a multi-purpose liquid damp proof membrane that provides an impermeable coating for floors' walls and roofs, etc. 1st post for me but desperately after some advice as to why my self levelling screed is cracking. Subfloor moisture measurement tools include the Protimeter Aquant or MMS for instant indications of potential moisture levels. Suitable for the damp proofing of interior masonry wall surfaces. g. Also forms a barrier to carbonation and ground gases. The installation of a liquid damp proof membrane is a vital stage in the construction process, for both new builds and refurbishment work where a structural DPM may be missing or damaged, or where residual construction moisture is present in the floor. Suitable for use as an overlay damp roof membrane to cementitious surfaces which were laid without an underlaying damp proof membrane. Applying Damp Proof Membranes. Looking lay a liquid dpm in the cellar floor followed by a self levelling compound as it uneven. 4M X 5M 500G Clear Heavy Duty Polythene Plastic Building Dust Rubble Sheet DIY. Tax: £18. rogerk101, Mar 13, 2020. The VPU-155 S is a versatile primer easy to apply by either trowel. Two-component, single coat application, damp proof membrane for controlling residual and constructional moisture in cementitious substrates. It is supplied ready to use. ★★★★★ ★★★★★ ( 3 ) Product code: 47327. Self levelling compound. Wykamol Technoseal DPM Damp Proof Paint. It's brilliant stuff and the new glueless karndean can literally just sit on top. you risk voiding the warranty of the flooring by not installing on a dust free, flat smooth surface. a suitable primer (depending on sub floor) should also be used. It is not suitable as a bond. weberfloor DPM can be applied on to concrete or cement based screed. It is suitable for use as a one or two application depending on the moisture content of the floor. Pouring liquid screed over under-floor heating pipes – image courtesy of JCW Floor Screeding. It protects a subfloor, keeping it warm and dry for long-term use. Select the department you want to search in. 2- Prime floor with neat p131 on non absorbent floors and water down on absorbent sand cement etc (approx 1-3 mix) 3- Next self level the floor with an acrylic levelling compound. 6 m2 1. Drybase® Liquid applied DPM is a single pack barrier coating for above ground use. The floor is old concrete and dips ~25mm in the middle. The dpm resin, is a sticky gooey 2 part epoxy based liquid to be precise. £20 per m2. Drying time of any brand and type of liquid DPM varies according to the application circumstances, e. 2/5. . As you say, it needed to be painted up the wall much higher. Damp most often comes up through the floor. Hello, I've finally identified the flloring in my house as ashphalt with a felt mat underneath. If you are using full contact adhesive to stick down your new wooden floor, a broadcasting of Kiln dried sand as you apply the 3rd coat of the Liquid DPM, will act as a superb adhesion promoter, if for example you use Lecol 5500 adhesive or Sika. ARDEX WPM 300 is a two component water based epoxy polyamide membrane/barrier coating. Characteristics / Advantages. . 00 Inc VAT. Liquid DPM for walls & floors. For example, if there is a significant problem with damp rising through your quarry tile. Drybase Liquid-Applied DPM is a single-pack barrier coating that is supplied ready to use. Self levelling and liquid damp proof membrane. It might seem a bit unusual. For advice on the correct epoxy floor coating for your requirements or specifics around epoxy DPM application methods please feel free to contact one of our technical advisers on 0117 982. Suitable as a damp proof membrane on solid concrete floors. Holds back rising damp where a damp proof membrane is either missing or defective. These attributes combined produce a unique multi-purpose liquid DPM with dozens of potential applications including but not limited to: • Damp proofing storage basements, where other tanking methods too costly • Damp proof paint for walls and ceilings • Concrete Floors: as a tough liquid floor DPM applied above or below screeds. The brickie has used extra wide Dpc which laps into the new extension over the blocks. Country. Liquid Applied Systems. I have an uneven concrete floor inside. The second coat should be applied as soon as the first coat has completely dried (typically 18 to 24 hours). Add to basket. Then you need couple coats of diluted SBR to aid adhesion between DPM and leveller. Lay and level the concrete slab, allowing sufficient time to dry out, as per BS 8203. 1-part, ready to use. No, I’m referring to the liquid DPM you put down today and you wish to lay flooring on tomorrow. Then 2 coats SBR 1-4 diluted. Suitable for extensions, basements and cellars. I need to put down a damp proof membrane and self levelling compound on top of that. Liquid DPM 5L Rating: 100%. 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. It has excellent adhesion to damp cementitious surfaces and once dried provides a dry barrier against moisture below. The product is applied in two coats. There has been a screed / self leveler been put down before the tiles have been laid. ON AVERAGE: £20 – £40 PER SQM. middle of a baking hot day in summer applied to a dry and subsequently warm surface, would take between 4 – 6 hours per coat. 45sqm to supply and fit. If you choose to lay the flooring straight onto the concrete then its advisable to carry out a damp test and if the results are more than 8% RH (relative humidity) 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. A liquid-applied DPM (damp proof membrane) is a simple solution and an excellent way to damp proof a concrete floor. My immediate thought would be to ensure the rest of the floor had a DPM or moisture suppressant, to give it the technical name. Apply the first coat in one direction, ensuring that the material is worked well into the substrate. substrate by the level / height of liquid. 5 8 ARDEX WPM 405. Damp proof membranes are installed in all new properties as a way of protecting from damp. RFC Liquid Damp Proof Membrane (DPM) is a professional 2-component applied surface primer. 7. What is liquid DPM flooring? Liquid DPM is a system that is used over a base floor. The upper half is an empty cavity. Clear Epoxy Primer & Coating. Drybase Liquid-Applied Damp-Proof Membrane High-strength damp-proof coating for a wide variety of applications. Nitoflor DPM permits early overlaying with vinyls,. . It is not suitable as a bond. You are essentially painting a concrete floor, after all! But it is an effective way to do it. PRODUCT CODE: SDH0931. Consideration should be given to applying the DPM to the top of the. link with wall DPCs to form an impervious barrier to prevent moisture reaching the interior of the dwelling. Altro Wood™ adhesive-free (5000m²) Altro Wood adhesive-free. 73 Kg CO 2. It should accommodate 0mm to 5mm (or thereabouts) It will cover an area of 26m2 (4m x 6. You also mentioned that there are vinyl tiles over the floor. DPM’s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. 186. The polyethylene needs to be curled up at the edge of the area to be screeded and stuck to the walls. You also mentioned that there are vinyl tiles over the floor. It is also suitable for application on damp surfaces, such as sand/cement and cement floors subject. HYTEC E570 ONE COAT is a two part, solvent-free, epoxy surface damp proof membrane (DPM). Hi Pete, I have the answer. & 20C). Liquid Epoxy DPM - 2. Martyn Bell, good evening again. Temperature, air flow and type of mix, being just a few. 5kg Our Epoxy Damp Proof Membrane is a two-component, solvent free, low odour epoxy resin membrane that is tolerant of residual moisture in concrete floors. BAL DPM can be used on anhydrite screeds up to 87% RH. Hi All come across this forum and would really appreciate some assistance. DIYDave. Capital Valley Plastics Ltd Damp-Proof Membrane Black 1200ga 25m x 4m (47163) (55) compare. Drybase Liquid-Applied DPM is water-. Mastic Asphalt – this is the earliest form of liquid DPM and is usually laid on the top of. Primer 1. £ 21. Add to Basket. £24. Great ridge formation and retention. Liquid Applied Systems. 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. Below Floor Screed 1. Might be worth having the floor checked properly first though as it sounds like you may have existing problems going by what you have already said. 99Inc Vat. The house is an ex-council 1950 semi. 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? I bought 16mm deep rubber gym tiles to finish the floor. Durham. Old laminate flooring is coming up, and underneath the laminate the underlay is very damp. Once applied, the product cures to form a membrane that is flexible and elastic. Our Liquid DPM (LVM Liquid Vapour Membrane Damp Proofing Paint) is a water-based ready-to-use waterproofing system supplied in an 5L tub. Distributors Near Great Britain. This barrier is intended to stop moisture passing from one to the other. Drybase White Liquid Damp Proof Membrane - 1L. for Floors 1. Can be easily applied by brush. Two-component, single coat application, damp proof membrane for controlling residual and constructional moisture in cementitious substrates. Description. PU280-S. Liquid membranes may be used for basement tanking and damp proofing, plant rooms, podium decks and radon. Walkable in 6 hours. Drybase® Liquid-Applied DPM Is suitable for use on solid floors, embedded timbers and walls. For areas where the coating needs to be trafficable, a tougher two-part epoxy coating, such as Drybase ECS Epoxy. . The cavity allows moisture within the floor to evaporate and the. Upgrade your underfloor heating installation with one of our high-quality liquid DPM products from top brands Ultra Floor, Tilemaster Adhesives, Ardex and Mapei and experience the ultimate in moisture. Size. Once applied, it cures to form a flexible and elastic membrane that resists. CaCl Test. 22 August 2019 at 10:27AM. £ 21. • 5L tin offers coverage of approximately 6. Rapid drying. ARDEX DPM has excellent. Sika primer MB or Sika-Bond Rapid DPM) or, in the case of a floating floor, a properly installed heavy-duty, non-permeable plasticThe liquid DPM coating dries to a flexible membrane with high crack-bridging properties, airtight values and adhesion. It varies in depth from around 12mm to 15mm. Blue 1. Use a liquid surface DPM. Liquid Composition. This seams to come up pretty easily The workmanship on the floor is of a shocking standard. Country. This Epoxy DPM is a two-component, solvent-free, low odour epoxy resin membrane that is tolerant of residual moisture in concrete floors. 3. Discover important FAQs including what is liquid DPM, what is the best liquid DPM and more. To be honest it’s worth having some sort of moisture suppressant put down just to make sure. 23 Jul 2018. BAL DPM is resistant to water, chemicals, grease and pollutants, and can be used internally or externally either as a DPM, primer, waterproofer or residual m. Adheres well to wet concrete even at 10°C. you cant put the dpm directly on to the. Sovereign Liquid DPM & Gas Barrier (DrySure) is a ready for use specialist styrene butadiene latex based liquid applied membrane. Build the external leaf first and then paint it with a liquid DPM (eg Black Jack DPM) and then build the internal. All you need to do is brush or roller it straight from the tub on to a sound, clean masonry surface to create a flexible damp proof and vapour. 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. Fosroc Nitoflor DPM is a two-component, solvent-free liquid applied surface damp proof membrane and residual moisture suppressant for concrete floors. #5. we sell the following epoxy resin DPM products:. The biggest advantage of using a liquid Damp Proof course, is that you do not have to rip up concrete floors. Ball offers a complete system for the measurement and control of subfloor moisture. Applications: Wet rooms Embedded timbers Sunken posts Floors (e. ft-24hrs. Hardwearing – high abrasion resistance. The most common type of DPM is installed during the building process. Waterproof. Resin Floor Coatings UK (RFC UK) offer floor and wall coatings, screeds, resin floor paints, primers, repair and cleaning products to the home and commercial markets. Pouring liquid screed. The easiest method is to push quilt-type insulation into the spaces between the joists from below. £12 - £16 per m2. Go to product. The DPM should not be cut at the floor junction as this will prevent correct lapping with the DPC. Discover how and why you should be. Floors: a damp proof floor paint that can be applied above and below screeds to provide a damp proof membrane. Apply ARDEX DPM 1 C to protect the floorcovering installation from residual construction moisture and ground bearing moisture. From the mid 1960s to the mid 1990s a typical concrete floor comprised a layer of hardcore, a polythene damp proof membrane laid on a thin bed of sand (to prevent puncturing), and a floor screed. Hydra Flex – Flexible Tanking Membrane. Drybase® Liquid applied DPM is a single pack barrier coating for above ground use. Rapid drying. 2 - 0. It is a highly effective membrane designed to be easy and quick to paint on (unlike others on the market). It is available in black or white with a consistency similar to that of thick emulsion paint. If the floor has no dpm, it'll have a damp history. 4M X 20M 1000G Clear Heavy Duty Polythene Plastic Building Dust Rubble Sheet DIY. It is ideal for use on damp floors and walls, before the application of floor and wall coverings. Drybase White Liquid Damp Proof Membrane - 1L Drybase® Liquid applied DPM is a single pack barrier coating for above ground use. Drybase Liquid-Applied DPM is a single-component two-coat paintable damp-proof coating that is easily applied to substrates by brush, roller, or spray. A damp-proof membrane (DPM) is a membrane material applied to prevent moisture transmission. Anhydrite screed usually costs in the range of £15 – £20 per sqm, mastic. A liquid-applied DPM (damp proof membrane) is a simple solution and an excellent way to damp proof a concrete floor. Your solid floor is porous (which is normal), trouble is water is getting into it either from underneath or from the sides. After hardening the ARDEX DPM produces a membrane with high inherent strength and excellent bond strength to appropriate substrates including very damp concrete and screeds. The only way to tell properly, is to carry out a proper test. 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). If you would like to know more about the range of damp proofing and other products we have available you can contact us on 01329 235252 or via e-mail info@allianceremedialsupplies. Time, money, and space for increasing the floor level are tight unfortunately - but I need something which will work. I moved into my new build nearly 2 months ago now and am having quite a few issues. Iam a floor layer with 25 five years experience. Coverage: 1 gallon of Abocrete, without sand or aggregate, covers 80 sq. Hardens in 1-5 hours depending on temperature. Sika Waterproof Coating Grey 5kg. Generally the coating needs further mechanical protection but this is taken care of by your screed. 2 coats SBR. Jord86, Jan 14, 2023. USES For priming, consolidating and sealing of: Absorbent and non-absorbent sub-floors, consolidat-ing weak cement screed and isolation of old adhesive residues. A ready to use liquid-applied damp-proof membrane. £18 - £22 per m2. Use 1000 gauge or thicker – ideal for this is the polyethylene use for the DPM under your concrete subfloor. 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. It might seem a bit unusual. Ideal for use where there is no functioning structural DPM (common in older properties). Ideal for Use in Basements/Cellars but may also be Used as an External Coating for Concrete, Brick, Block & Bonded Renders. Screwfix Select. 00. The product is applied in two coats. This Epoxy DPM is a two-component, solvent-free, low odour epoxy resin membrane that is tolerant of residual moisture in concrete floors. If the coating is not going to be the final decorative surface and a floor covering will be applied afterwards then a ready-to-use latex-based coating, such as Drybase Liquid Applied DPM, can be used. If you notice a gap between the straightedge and the floor, your floor is dipping in that area. In this video I apply a damp proof membrane / tanking slurry to a concrete floor to stop moisture coming in to the building where we have issues with mould a. Also acts as a waterproofer for walls, above ground structures and foundations. 13 W/m2K dependant upon the p/a ratio Benefits of Insulslab Lightweight foundations Single point of contact from foundation to finished floor level Finished slab level Finished slab levelArdex do a excellent one and will that smoothing compound ontop as well , Instarmac also do one aswell and then use there smoothing compound ontop . Standard sand & cement screed, dries at approx 1mm per day, depending on variables. Chimney damp proof course (labour and scaffolding not included) £75 per roll. under laminate, tiles, screed, plaster and wooden floors) Gas barrier for CO², Methane and Radon Flood resistance Primer for replastering to stop salt attack. 73 Kg CO 2. Can be used as a Damp Proof Membrane on sub-floors not under hydrostatic pressure. A damp-proof membrane is a layer of material usually laid below concrete floors during construction. SKU: AD040 Categories: Liquid DPM, Wood Floor Preparation. Then if solid floor, Mapei Ultimate, SF, on special at moment and yes it’s available - again, click and collect only. 30 Dec 2018. I wanted to fit LVT flooring or self adhesive vinyl tiles. #1. Drybase Liquid-Applied DPM is a single-pack barrier coating that is supplied ready to use. If a DPM has failed or perhaps was never installed in the first place, the features. This versatile product is available in black or white and offers long-lasting protection against dampness. 45 minutes at 50% r. An ARDEX liquid Damp Proof Membrane will protect the floorcovering installation from residual construction moisture and rising damp, where the highest measurable. If you have a engineered wood floor and your new slab is dry below 75%rh then technically you don’t need one. applying 2 coats of Drybase® Liquid DPM. Can be over painted after 16 hours with most types of floor coatings. The liquid floor is perfectly level and should be walkable. £96. Currently in Stock. Its easy application and quick drying times make it a convenient choice for all your wall coating needs. 60 – £ 110. Bit confused with all the different products and combinations though. 15 November 2008 at 4:54PM. Our products are all carefully selected by our in-house experts to provide the highest level of protection for your property. Apply this liquid membrane to your subfloor to prevent residual moisture from the concrete penetrating your natural wood floor. It can also be used on floors tanked with Sovereign Hey’di K11 when a vapour barrier is required. Robert Chambers New Member. 4- When dry (24hrs+) you can give first coat of dpm (F75) 5- Second coat of dpm (f75) when first is dry. Cement based coating for preventing water and damp penetration in walls and floors. Typical industry surface applied DPM. It is low odour, solvent free, and most importantly deals with constant low levels of moisture in concrete floors. Durham. Safe – no solvents and non-flammable. Use on concrete floors as an alternative to polythene. Resin Floor Coatings UK. Best bet is pre latex screed the floor with Ardex NA, them use. I think this is too expensive, so got a quote of another supplier of £2565 plus any potential floor preparation, with latex screen costing £13 /sqm or a feather finish at £2. Maximum bond can be achieved by vigorously brushing the primer coat into the floor substrate using a stiff bristled broom. Application of a liquid dpm after extensive sub - floor preparation, the sub floor being a new build extension, we had to make up 30mm to level floors, becau. You are essentially painting a concrete floor, after all! But it is an effective way to do it. No need for a separate primer. It can be used as a damp-proof membrane on sub-floors that are not under hydrostatic pressure. Guarantees the early laying of all floorcoverings. ARDEX DPM is a solvent free, low viscosity, two-component epoxy resin. 100% solids, high build coating. Thick, flexible coating resists movement and minor cracks. Odourless, rubber-enriched bitumen emulsion. Easy Handling & Installation. Ideal for Use in Basements/Cellars but may also be Used as an External Coating for Concrete, Brick, Block & Bonded Renders. 1. Plastic membrane laid with excess along the sides for lapping later. 15 W/m. Any recommendation on products to use- most I've found say only suitable for concrete, I've only found multi tite 2k suitable for both but it's not cheap. Drybase® Liquid-Applied DPM is a single-pack barrier coating for above ground use. Can be used over underfloor heating. Withstands reverse hydrostatic pressure to 4. Conclusion. Step-by-step guide for how to apply liquid DPM for concrete floors. That’s assuming quarry tiles are in good condition, no loose tiles, no known problems with major damp, no issue with raising floor height by leaving tiles in place, etc. Using Damp-Proof Membranes on Walls. Limitation: Do not directly bond wooden flooring to Drybase® Liquid-Applied DPM coated concrete. - finish with a self levelling compound. A liquid epoxy damp proof membrane (DPM) is a two-component epoxy resin membrane, specifically designed to be applied to damp floors to create a barrier between your floor. New NHBC regulation comes into. Benefits • Hard wearing & flexible DPM • Ready-to-use straight from the bucket • Quick drying - typically touch dry in 1 hourIf you choose to lay the flooring straight onto the concrete then its advisable to carry out a damp test and if the results are more than 8% RH (relative humidity) 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. we sell the following epoxy resin DPM products:. Really dont understand this dpm stuff but first flat so want to get it right and not alot of money. 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. For a self-levelling screed a system such as Flowcrete UK’s Hydraseal would be used. Our costs are ballpark averages – get a local tradesperson to quote now. • Apply a primer and then pour a latex or water-based levelling compound to a minimum. F. • 1 or 2 coat application. STOPGAP F78 impedes the passage of residual construction moisture from affecting subsequent floor covering installations, therefore. Cost. It is not suitable as a bond. co. Search by distributor Kellaway Building Supplies Travis Perkins. #3. Installing a DPM might introduce problems that don't currently exist plus I have to pay for it. The waterproof paint membrane dries to a flexible. com. The product is applied in two coats. £. The Drybase range of liquid-applied coatings including Drybase ECS Epoxy Floor Coatings and Drybase Liquid-Applied DPM can be applied directly to damp floors to create a. Rather than a liquid DPM you might be better using something that will continue to allow moisture out of the concrete e. #3. 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. Originally for the first room I used pva primer , wickes self levelling compound and then painted with wickes liquid dpm. Coverage - Typically 10 - 20 m 2 per 5 kg pack (based on two coats). rogerk101 said: ↑. Drybase Liquid-Applied Damp-Proof Membrane High-strength damp-proof coating for a wide variety of applications. Find a stockist. A decent fitter will test the slab for you before fitting anyway. applying 2 coats of Drybase® Liquid DPM. Liquid Applied Membranes ARDEX Product Property Guide 2.