All commercial accessories supplied and installed, Latex screeds, Ply, Liquid DPM, primers and other floor preparation products. [3] 4. 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 and the layer below. 7. 5 8 ARDEX WPM 405. The stand-off studs create an air gap. Distance from bison to existing tile surface is 55mm; this is ~10mm higher than kitchen floor ( there is a door threshold in-between. Thick, flexible coating resists movement and minor cracks. Guarantees the early laying of all floorcoverings. Rapid Set Skim CoatRepairs, levels, and smooths concrete for applications. 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. Thin; only 40 mil. Once dry, Arditex NA, a latex based self levelling compound, was applied. It is low odour, solvent free,. It is supplied ready to use. advise that you apply one coat of DPM. Once applied, the product cures to form a membrane that is flexible and elastic. However, this option may not be the best solution in many circumstances. Odourless, rubber-enriched bitumen emulsion. Safe – no solvents and non-flammable. 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. Features and benefits: One product solution for complete waterproofing. Consult adhesive manufacturer. £2,000. Guarantees the early laying of all floorcoverings. £300. M. 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. Add to basket. Acts as a water proofer for floors and walls, above ground structures and. Damp proof membrane (DPM) taped at the edges and anywhere it is joined. The moisture readings taken at the time were 120 and 85, although the 120 reading was due to fresh concrete having recently been laid to level. Run a string across the ground. is an odourless, rubber enriched bitumen emulsion damp proof membrane. I was only wondering about the waterproof PVA really. The product is applied in two coats. Our Liquid DPM was also developed to protect. evilgoose Posts: 532 Forumite. • 5L tin offers coverage of approximately 6. Walkable in 4 hours. Provides sandwich damp-proof membranes for floors. Add to basket. Step-by-step guide for how to apply liquid DPM for concrete floors. Who places the screed. 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. This Epoxy DPM is a two-component, solvent-free, low odour epoxy resin membrane that is tolerant of residual moisture in concrete floors. Use on concrete floors as an alternative to polythene. Damp survey. Concrete is naturally very porous. Limitation: Do not directly bond wooden flooring to Drybase® Liquid-Applied DPM coated concrete. Browse damp-proof membrane products from Toolstation here. When dry, a sand/cement or concrete screed of ap-proximately 50mm thick is then laid over the EVER-WP60 Liquid DPM. You also mentioned that there are vinyl tiles over the floor. My ground floor is a partial basement formed of high density block work with the cavity filled with waterproof concrete to mid height and liquid DPM below ground level. Select the department you want to search in. I would advise a single part flexi tile adhesive on top which will enable you to have stone, ceramic or porcelain tiles fixed. Plastic membrane laid with excess along the sides for lapping later. The wall is now down and its time to level off the floors. The waterproof paint membrane dries to a flexible. Then SL, this will take care of the craters and uneven sections from remaining tile adhesive. 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. The coating cures to form a rubber-like elastomeric waterproof membrane and may be applied over many substrates, including asphalt, bitumen and concrete. Anhydrite screed usually costs in the range of £15 – £20 per sqm, mastic. Whats people lookup in this blog: Liquid Damp Proof Membrane For Concrete Floor; Liquid Moisture Barrier For Concrete FloorsPermaSEAL Liquid DPM is a high quality, ready to use, liquid applied damp proof membrane, designed to be used on floors and walls to provide a quick drying, highly flexible waterproof barrier. Two coats will provide protection up to a maximum hygrometer reading of 95% RH. DAMP BARRIER PAINT - A highly advanced styrene-butadiene rubber (SBR), liquid applied membrane paint. £89. The Epoxy stuff seems a lot pricier than I was expecting. :thumbsup. The epoxy DPM comes as a two-component system. Background: I am currently renovating a 1950’s property with no DPM. Coverage: 1 gallon of Abocrete, without sand or aggregate, covers 80 sq. Volume. 4M X 20M 1000G Clear Heavy Duty Polythene Plastic Building Dust Rubble Sheet DIY. Add to basket. Visqueen Liquid DPM is emulsion based and free of solvents. It needs to have a further coating to protect it from damage. Waterproof. Drybase 2mm Plaster Membrane Mesh (2m x 20m) - Low-Profile Plaster Membrane For Use on Damp Walls. rogerk101, Mar 13, 2020. It is available in black or white with a consistency similar to that of thick emulsion paint. 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. Drybase Liquid Applied DPM is supplied ready for use and is applied in two coats by brush, roller, or airless spray. merit said: ↑. The edges of the DPM should have been flopped up the walls, say, 300mm and later trimmed back to suit. applying 2 coats of Drybase® Liquid DPM. 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. Then laid down homebase underlay with built in vapour barrier and laminate and this floor seems fine but for room 2 i just painted with dpm as was already tiled with old fashioned vinyl floor tiles and looked level and then. 1200 Gauge DPMs. I'm looking for opinions on the best self leveling screed to use on my slightly wonky concrete garage floor. Compatible with all SikaBond wood floor adhesives. I am looking for some advise about laying a SLC with a liquid DPM. Liquid DPM over quarry tiles is a comprehensive guide that aims to provide valuable insights into preserving and safeguarding the integrity of your floor by utilizing the advantages of a liquid damp proof membrane (DPM). £107. ARDEX WPM 300 is a two component water based epoxy polyamide membrane/barrier coating. EITHER. If you lay a liquid dpm, you need to cover the walls as well, for the same reason. Kingfisher clear epoxy resin for concrete floors can also form a moisture proof membrane. Can be applied to damp surfaces. #4. Drybase Liquid Applied DPM A ready to use liquid-applied damp-proof membrane. 99Inc Vat. Sikabond Rapid Liquid DPM for Wood Flooring. Whilst this is not ideal, it can be a low-cost solution, which is easier than restoring old tiles, or completely digging out and relaying a new floor. No corner reinforcements required. #5. How to install insulation in a suspended beam and block floor. See moreRFC Epoxy Damp Proof Membrane is a professional 2-component applied surface primer for brushing onto concrete floors and. (3 Reviews) £22. 2. DIYDave. We want to lay vinyl sheet in the kitchen. rifraf74. However, when I hammer-fix the battens to the concrete I'm going to punch holes in my DPM. 2 coats SBR. Damp Floor Epoxy Kit. Drying time of any brand and type of liquid DPM varies according to the application circumstances, e. This is added at ground floor level and is generally covered with concrete. Add to basket. Above or below ground, damp can creep up on you. Typical industry surface applied DPM. Drybase Liquid-Applied DPM is a liquid-applied damp-proof membrane providing a barrier to damp and ground gases, such as. Then laid down homebase underlay with built in vapour barrier and laminate and this floor seems fine but for room 2 i just painted with dpm as was already tiled with old fashioned vinyl floor tiles and looked level and then. You can level out an uneven subfloor easily by applying the mixture and leaving it to dry for up to 24/48 hours before walking on it. For external tiled areas, we would always advice on the use of a capillary passive drainage system like BAL’s new external tiling systems which ensure the rapid drainage of tiled surfaces. Ready to use, ultra-quick drying, flexible liquid membrane for internal and external waterproofing applications. or self level to adhere to. 16. Ready for your floor finish. Also its not a good idea to apply ( paint ) a liquid dpm straight onto rough concrete as it will eat it up and might pin hole. 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. Screwfix Select. Screwfix Select. OR. Drybase® Liquid-Applied DPM Is suitable for use on solid floors, embedded timbers and walls. Damp survey. It combines excellent adhesive, elastic and waterproofing properties. I have an uneven concrete floor inside. It comes in black or white and has a consistency similar to thick emulsion paint. It is not suitable as a bond. 0. Damp most often comes up through the floor. dried sand broadcast into the wet. Distributors Near Great Britain. Ive used my BASIC damp. Information ARDEX DPM 1 C. We used the Ultra Floor system, Ultra DPM-it,. marginally exceeds 70%, a liquid damp proof membrane (DPM) is required. Larsen Universal Epoxy Flooring Damp Proof Membrane. Liquid damp proof membrane (water based bitumen) applied in several coats directly to the concrete floor with a roller or brush. DPM added 1 to 2 mm extra then you have a 5-7mm self levelling screed on top then the width of these tiles and there bonding adhesive. 45 minutes at 50% r. This is one of the reasons liquid DPM’s have emerged as a more advanced and popular solution. • Solvent Free, Low Odour. Resistant Type. Especially suited to refurbishment projects where old adhesive residues are present. 00 Inc VAT Qty Add to Basket Read More A two-component, solvent free, low odour liquid epoxy DPM that is tolerant of residual moisture in concrete floors. Find a stockist. Rapid drying. under laminate, tiles, screed, plaster and wooden floors) Gas barrier for CO², Methane and Radon Flood resistance Primer for replastering to stop salt attack. Then once the screed is dry use a liquid DPM such as F-Ball Stopgap F77. Wow! Someone. It can also be used as an adhesive for the likes of wood block flooring and insulation boards, or as a plaster bonding agent – even on difficult surfaces. Obviously if its a surface DPM you dont have a few inches of concrete to weigh it down. Dig it all up (Its possibly up to 50mm thick) Then lay DPM/Visqueen sheets tanked up the walls and lay new concrete or use an epoxy liquid DPM tanked up the walls and lay a deep base screed. From below, installing insulation to improve the floor or as part of a basement insulation project is fairly straightforward. 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 damp-proof barrier without raising the floor level. Drybase Liquid-Applied DPM A ready to use liquid-applied damp-proof membrane. Two Pack. £36. HYTEC E570 ONE COAT is a two part, solvent-free, epoxy surface damp proof membrane (DPM). Made from recycled materials. The product is applied in two coats. weberfloor DPM can be applied on to concrete or cement based screed. With a consistency similar to that of thick emulsion paint, it's suitable for use on solid floors, embedded timbers and walls. This is a solvent, water free, epoxy resin and. 2 coats liquid DPM. Screwfix customers rate this product 4. Anti-fracture protection up to 1/4″ over shrinkage and other non-structural cracks. It is not suitable as a bond coat on walls where Drybase® Flex Membrane or. Chemical damp proofing cost. Protection up to 3m. Rapid drying (approx. The easiest method is to push quilt-type insulation into the spaces between the joists from below. It is suitable for sticking down any species of wooden flooring to almost any subfloor. IKOpro Synthaprufe Trade is easy to apply and provides damp proofing for concrete floors, foundations and masonry walls below, at or above ground level. Delivery Next day available. Liquid damp proof membrane (water based bitumen) applied in several coats directly to the concrete floor with a roller or brush. kez, Apr 22, 2019. The only way to tell properly, is to carry out a proper test. Compatible with all SikaBond wood floor adhesives. The problem is that around the edge of the room the flioor is cracked and loose. Dri-wall DPC injection cream is the quick and versatile solution to effectively bring damp walls under control. View all: Sika Waterproof Sealants. Upper floors are airtight timeframe. £100 - £600. Wet underfloor heating. Sika Rapid DPM is intended for priming and sealing absorbent and non-absorbent subfloors, Also suitable for consolidating weak cement screed and isolating old adhesive residues. Option 3 – Apply a liquid DPM. Liquid Epoxy Damp Proof Membrane - 5kg. #1. Typical values for moisture sensitive floor finishes are less than 0. Other DPM’s may be considered if they have appropriate third-party certification and are installed in accordanceDrybase Liquid-Applied Damp-Proof Membrane High-strength paintable damp-proof coating for a wide variety of applications. A vapour barrier, on the other hand, is a damp proofing product attached to a wood floor underlay to reduce moisture passage. The easy application is carried out in two coats with a brush or roller. IKOpro Synthaprufe Trade is a blend of bitumen emulsion and synthetic rubber latex and can be used to damp proof structure below, at or above ground level. Ready-to-use. It is available in black or white with a consistency similar to that of thick emulsion paint. SikaBond®- Rapid DPM is a solvent free, single part moisture curing reaction polyurethane primer and damp proof membrane for cement-based substrates. Holds back rising damp where a damp proof membrane is either missing or defective. The upper half is an empty cavity. 40 Kg CO 2. Applying Damp Proof Membranes. Produced from Recycled Material. middle of a baking hot day in summer applied to a dry and subsequently warm surface, would take between 4 – 6 hours per coat. #4. Also acts as a waterproofer for walls, above ground structures and foundations. Drybase® Liquid-Applied DPM is a single-pack barrier coating for above ground 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. The damp proof membrane (DPM), normally 1200g polythene or radonDIYDave. My questions are: Is there any reason to use a roll of DPM vs a liquid. Ideal for use where there is no functioning structural DPM (common in older properties). Hello, I've finally identified the flloring in my house as ashphalt with a felt mat underneath. you cant put the dpm directly on to the. There is no damp proofing on the floor. • Apply a primer and then pour a latex or water-based levelling compound to a minimum. Currently in Stock. Currently there is no dpc/dpm in the wall, so lots of damp on the inside wall. Our costs are ballpark averages – get a local tradesperson to quote now. Cost. 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. Can be over painted after 16 hours with most types of floor coatings. DIYDave. It is low odour, solvent free, and most importantly deals with constant low levels of moisture in concrete floors. Basically it was laid like this: timber frame built on top of garden dirt. I want to avoid digging it up if I can. My immediate thought would be to ensure the rest of the floor had a DPM or moisture suppressant, to give it the technical name. 4M X 20M 1000G Clear Heavy Duty Polythene Plastic Building Dust Rubble Sheet DIY. 00 Excl. Some houses in early 70s don't have a DPM as I've found out over the years. P. BAL DPM can be used on anhydrite screeds up to 87% RH. £750 - £3,000. It is supplied ready to use. It really depends on what levelling compound was used, if it was ardex Na it would be fine to put a liquid dpm onto but not all compounds are the same. A decent fitter will test the slab for you before fitting anyway. It has excellent adhesion to damp cementitious surfaces and once dried provides a dry barrier against moisture below. Your solid floor is porous (which is normal), trouble is water is getting into it either from underneath or from the sides. M . The liquid DPM forms a continuous barrier that seals the surface and protects the underfloor heating system from moisture and damp. #3. Ideal for Use in Basements/Cellars but may also be Used as an External Coating for Concrete, Brick, Block & Bonded Renders. The biggest advantage of using a liquid Damp Proof course, is that you do not have to rip up concrete floors. Ready-to-use. 17DW400. Drybase® Liquid-Applied DPM is a single-pack barrier coating for above ground use. It can also be used on floors tanked with Sovereign Hey’di K11 when a vapour barrier is. 3 bar/65psi for 14 days (ASTM C1306-05a)Jul 13, 2011. Odourless, rubber-enriched bitumen emulsion. It helps to prevent damp and moisture from entering the building’s structure and interior. For areas where the coating needs to be trafficable, a tougher two-part epoxy coating, such as Drybase ECS Epoxy Floor Coating, should be used. Damp proof membrane paint is a liquid DPM that blocks the action of penetrating damp on floors, ceilings, and internal walls. SikaBond® Rapid DPM is a single part moisture curing polyurethane. This enables earlier access onto the floor for the application of screeds, coatings and other floor coverings including tiles, vinyl, wood and carpets. liquid damp proof membranes (moisture blocker) 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. The internal floor is tiled, and I wont be lifting the tiles. • Protect from ground gases such as Radon and Methane. If a radon barrier is required, lay this over the grouting layer and extend it. com. Overall, investing in a liquid damp proof membrane for your concrete floor is an excellent way to protect your investment and ensure your floors last for years to come. Once applied, it cures to form a flexible and elastic damp-proof membrane. Drybase White Liquid Damp Proof Membrane - 1L. I moved into my new build nearly 2 months ago now and am having quite a few issues. floors. Hardens in 1-5 hours depending on temperature. It is supplied ready to use. 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. 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. New-build install: £50 to £75 per square metre. Internal Asphalt flooring. 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. • Protect from ground gases such as Radon and Methane. The most common type of DPM is installed during the building process. Can be used on walls and floors to prevent water ingress and dampness from the ground. DESCRIPTION Water based rubberised bitumen emulsion for internal and external use. USES For priming, consolidating and sealing of: Absorbent and non-absorbent sub-floors, consolidat-ing weak cement screed and isolation of old adhesive residues. 6 m2 1. The polyethylene needs to be curled up at the edge of the area to be screeded and stuck to the walls. If the straightedge tips to one side, your floor may have a raised bump in it. SikaBond® Rapid DPM is a single part moisture curing polyurethane. Liquid Applied Systems. It is available in black or white with a consistency similar to that of thick emulsion paint. For areas where the coating needs to be trafficable, a tougher two-part epoxy coating, such as Drybase ECS Epoxy. 64 Inc VAT. Liquid-applied membrane (LAM) is a monolithic, fully-bonded, liquid-based coating suitable for many waterproofing and roofing applications. In addition to our office based Technical Department, we employ a highly experienced team of 25 Area Sales, Contract and Business Development Managers, who are available nationally to offer advice, support and training, not just over the phone, but in person and on-site. The liquid floor is perfectly level and should be walkable. This barrier is intended to stop moisture passing from one to the other. Once dry apply two coats of Drybase® Liquid DPM as normal. Our liquid waterproof membrane is a liquid DPM that makes your floors durable and water-resistant. Self Leveling OverlayFind the overlay to meet your project's needs. For example, if there is a significant problem with damp rising through your quarry tile. Larsen Universal Epoxy Flooring Damp Proof Membrane. The product is applied in two coats. personally i would concrete the whole floor to a level finish and paint it with anti slip. Best bet is pre latex screed the floor with Ardex NA, them use. Fully isolate the dampness in the floor using a surface Damp Proof Membrane (DPM) How much should DPM overlap? The purpose of DPM Care must be taken to ensure a) there are no holes or tears in the sheet that could allow water penetration and b) there is a sufficient overlap of sheets by at least 150mm should more than one sheet be required. Country. Liquid DPM is a system that is used over a base floor. The liquid dpm coverage could be a lot less depending upon surface texture, and they are not kidding, if it’s rough it will take a lot more to cover. Self levelling and liquid damp proof membrane. The liquid DPM forms a continuous barrier that seals the surface and protects the underfloor heating system from moisture and damp. When fast-track tiling is required consider the use of a Damp Proof Membrane such as BAL DPM. Drybase White Liquid Damp Proof Membrane - 1L Drybase® Liquid applied DPM is a single pack barrier coating for above ground use. It's joining onto the garage I'm converting so the whole floor is getting built up with polythene DPM, insulation, floating chipboard. Drybase White Liquid Damp Proof Membrane - 1L. It is suitable for use as a one or two application depending on the moisture content of the floor. This damp proof paint is supplied in 5 Litre containers, available in White or Black. Painted Floors • The surface must be mechanically cleaned to remove all traces of paint. This DPM is normally created by the installation of a polyethylene or bituminous sheet within / below the main substrate structure. 10 and A118. In most cases the surface to be screeded will consist of 50 to 100mm-thick layers of insulation boards over a DPM (damp-proof membrane) on top of the floor structure. Both are excellent and have used both on various projects and with excellent results. ON AVERAGE: £20 – £40 PER SQM. This water-based compound can be applied to damp concrete floor slabs, screeds and walls. 2 coats SBR. Sovereign Epoxy DPM is a solvent free two-part resin that chemically cures to provide a surface membrane. Drybase® Liquid applied DPM is a single pack barrier coating for above ground use. Flooring FAQs. Whether you need to cure a damp concrete floor with a liquid DPM or paint your garage we have a specialist paint product fit for purpose. Ground bearing concrete floors - 1960s to 1990s. 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. 57,050 Kg CO 2. Standard sand & cement screed, dries at approx 1mm per day, depending on variables. Before applying the damp proof paint, stir the contents of the bucket well. Our easy to install range is available in various thicknesses up to 0. Liquid DPM is a system that is used over a base floor. This enables earlier access onto the floor for the application of screeds, coatings and other floor coverings including tiles, vinyl, wood and carpets. It protects a subfloor, keeping it warm and dry for long-term use. Perfect for treating commercial or domestic wet rooms before tiling. The product is applied in two coats. Hugh James explains why. 22 Feb 2007 #1 I wanted to self-level the floor using mapai ultimate leveller 1210 and Secrete Ulitmate Primer for adhesion. How to Damp proof a floor and walls using synthaproof as a damp proof membrane is shown in this tutorial. Pot life: approximately 20-30 minutes. Great ridge formation and retention. The liquid membrane forms a strong seal and makes a permeable layer to enable moisture to evaporate off. Once applied, the product cures to form a membrane that is both flexible and elastic. It is supplied ready to use. Speak with a technical adviser if unsure. I went to buy compound to level it yesterday, and now it looks nice. I will then go about levelling the floor, adding in a liquid DPM, more levelling compound and vinyl tiles as the finish. Rapid drying. Fosroc Nitoflor DPM is a two-component, solvent-free liquid applied surface damp proof membrane and residual moisture suppressant for concrete floors. A Liquid Epoxy Damp Proof Membrane (DPM) is often used as a remedial solution where an existing DPM has failed or was never installed. Bostik's damp proof membranes provide essential moisture mitigation and suppression for subfloors, helping to protect your installation for years to come. ft-24hrs. Liquid-Applied Membrane. 23 Jul 2018. 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. Developed to suppress residual construction moisture in cementitious subfloors including power floated concrete and sand/cement screeds. rogerk101 said: ↑. so, typically for properties built before the 1970s we recommend that an epoxy-based DPM should be used on the ground floor to control moisture coming from the ground. Our products are all carefully selected by our in-house experts. Jord86, Jan 14, 2023. link with wall DPCs to form an impervious barrier to prevent moisture reaching the interior of the dwelling. That means it’s a perfect paint on damp proofing. DIYDave. Drybase® Liquid DPM is water based and can be. The floor under each tile i have removed has been visibly wet, but has dried in a few hours of the tile being lifted. This prevents moisture from the screed attacking the wood flooring and ultimately ruining it. Information Liquid Waterproof Membrane. 99. Then you need couple coats of diluted SBR to aid adhesion between DPM and leveller. One Abocrete kit with sand covers approximately 28 sq. Design considerations General When choosing a PIR board for a floor insulation project, care should be taken to ensure: That the product is suitable for the intended application (check the individual manufacturer’s data sheet). Anhydrite screed usually costs in the range of £15 – £20 per sqm, mastic. . And yes you can level the floor after. Drybase® Liquid-Applied DPM Is suitable for use on solid floors, embedded timbers and walls. It's brilliant stuff and the new glueless karndean can literally just sit on top. The DPM should: have sealed laps of at least 300mm wide. Applications: Wet rooms Embedded timbers Sunken posts Floors (e.