74 inc. screed over insulation. jonathanc Guest. It is not. 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. 5m) It will have 50mm insulation boards on top of it, followed by 18mm/22mm. The lower sand ratio means a higher ratio of cement, which gives a stronger mix. The company keeps abreast of market developments by. If there is an operational DPM beneath the concrete you don't need one on top. For technical support please call. However to get BC off your back you can use a epoxy DPM and sand scatter it before it sets. DPM Membranes for Concrete Floors A range of high quality DPM membranes from Capital Valley Plastics, designed for use with solid concrete slabs. 001 Ardex Australia 2015 Bulding regs would require 100mm insulation and 70mm reinforced screed for this. O and the Answer to Mapei and Uzin is no. Which way would you go, 1000 gauge plastic under slab OR liquid dpm between slab and screed? renovateduk, Jul 17, 2009 #3. There is a small section along the chimney where. We could scrape up the tiles and start again. DPM's must be carefully protected where folded up the perimeter walls, and lapped under the DPC particularly at door openings. "Turn off electricity and gas only if it’s safe to do so," he said. 3) 50mm - Screed with Concrete Fibres, on top of the insulation boards. Our Epoxy DPM can be used on concrete floors and fine concrete screeds, of not less than 50mm thick in the case of un-bonded screeds. 20 mm thickness should do it and im looking for the. We need to raise one level by 6mm then screed then laying 2. This will leave bitumen (ironically) glue residue behind which is a problem to remove I believe - and must be completely gone. Yes. Hi All come across this forum and would really appreciate some assistance. Lay the damp proof membrane (DPM) (normally 1200g polythene sheet/300g micron or a radon barrier if specified), over the sand-blind base. doors. I am the Managing Director of the Multi-Award Winning Speed Screed. Size is 4m x 4m. 4 so you have around 1. 100mm thick (can be heated) - Levelling screed (as required: self levelling compound, sand/cement screed etc) - Flooring, e. Insulation must be provided under their entire area to ensure compliance with the Building Regulations is achieved. TB243. Maximum depths are around 10-15mm, however with the addition of bulking aggregates (normally kiln. Through DPM of course so a bit of silicone down the screw hole to seal the hole. To avoid such issues, it is therefore extremely important to make sure that the screeds are given sufficient time for drying. We've just had our garage converted and our builders have laid a screed floor. Well, when I did exactly this on my lower retaining wall - a mere footandahalf high - I lined the back with DPM, the stuff you put under screed to seal yer floors from rising damp. It is essential that this. There are two main options: 1. 45sqm to supply and fit. For bonded screeds, M-Bond Extra epoxy resin combinedWhen laying self-levelling screed, the thickness varies from product to product, however as a general guideline please find the depths below: Minimum depths are usually 2-3mm, however there are some products that can go down to “featheredge”. Where a concrete slab or a screed is to be poured on top, the VCL will also protect the foil face of the board from alkalis within the concrete, and stop poured concrete opening board joints and causing a thermal break. 5kN/m2. 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. Epoxy DPM itself (the actual product epoxy) wont fail once set. The surface should be of sufficient quality and. This barrier is intended to stop moisture passing from one to the other. Reinforcement to Suspended Floor SlabsClick and buy N-Virol Superseal Plus Damp Proofing DPM Paint which an be used for several applications including damp walls, floors and on basement walls. Block and beam grout/slurry wetness. Our Liquid DPM can be used on walls under a render to create a flexible waterproof layer. Self levelling compound is often known as floor screed or floor levelling compound and is essential for creating an even floor surface in preparation for upper flooring layers. If the insulation is going below the slab, the damp proof membrane (DPM) is laid next, followed by the insulation, a polythene separating layer, and the concrete slab. adamhardy Member. . This DPM is a ‘thick’ plastic sheet mostly 1000 – 1200 gauge polythene material. Care must be taken to a) ensure there are no holes or tears in the sheet that could allow. Our Liquid DPM can be used on walls under a render to create a flexible waterproof layer. . An expansion gap may be necessary around the edge of the floor finish in screed or. The blockwork above the DPC will become saturated and cause damp problems within the extension, the skirting boards will rot and the mould will occur on the plaster. Visqueen 2000 gauge Polythene - 12. 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. I will post up a pic of the failed LVT in a minute for you! Screed seems to be getting damper. apparently some of the screeds had a cold or hot bitumen in or under them. Alan Jackson - Commercial Manager UK and Ireland - Gypsol. The purpose of DPM. A flat duct could now be layed over concrete (150×50 mm) this would encroach into insulation but as building regs are 75mm on floor insulation only 25mm. It may well require the re cement to be removed, a liquid dmp used with dry sharp sand thrown on it before it dries, and then use a flexible self levelling screed. Capital Valley Plastics Ltd Damp-Proof Membrane Black 1200ga 25m x 4m (47163) (55) compare. For this, a metal mesh standing with plastic pillars ( (feet) will be laid before the concrete is. Ultraplan Renovation Screed 3240 is suitable where good resistance to loads is required, also for castor wheel traffic and underfloor and undertile heating systems. Ask yourself where the gallons and gallons of water in the slab are going to go - apart from potentially lifting the DPM it will come through any defects in the DPM and cause problems. concrete slab. This could have been avoided by building the membrane on to the inner leaf only and protecting it with a 100mm DPC, or by protecting the wide horizontal DPC with an. Fit a damp proof membrane as above, then lay a separation layer. ARDEX DPM 1 C may be used if; 1. You can lay a fast track DPM (damp proof membrane) if your new concrete has had 2/3 weeks drying time. The liquid membrane forms a strong seal and makes a permeable layer to enable moisture to evaporate off. Installation systems for tiling and natural stone. user contributions licensed under CC BY-SA. •Suitable for use on cement/sand screeds containing water based under floor heating systems •Apply ARDITEX NA direct without priming JUNE 2019 (SUPERSEDES MARCH 2018) PRODUCT DATA SHEET (43) V. Just lap the whole room up as normal, blobs of. The oversized DPM was instead lapped with the DPM that was placed under the screed. The job is under Building control, so I'm sure the inspector will like a nice solution as well! The shower can't be lifted higher (elderly. The clips only pierce the thinner layer above the insulation, which is only really there to ensure an unbonded concrete/screed above. 6 March 2017 at 8:04PM edited 6 March 2017 at 8:59PM. Maybe better to use a fibre based leveling compound instead, like Granfix Fibreflex 50 or similar. Types of Liquid DPM. I thought common practice was to tuck the DPM under the DPC, but mine is the other way around: I'm about to start taping the insulation around the studwork and then I'm going. Insulation will then go on top and the screed layer would go over the whole lot. The total floor insulation cost will have two elements – the cost of materials and. DPM sheets should be overlapped by at least 300mm. #Screeding #Sc. +44 (0) 333 202 6800. 1200g DPM will be fine. 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. 25 Apr 2010. Firstly, there was no need to use a liquid dpm if you used underlay with a built in vapour barrier. UZIN has the right floor damp proof membranes for damp proofing floors. 50 Ex VAT £21. The DPM can be used as either below the slab application, directly below the flooring surface or in a sandwich construction, between base concrete and the screed. 23 Dec 2020. The advantage of having the foundation. ) • Floating (used to enable installation of thermal or impact sound insulation). above the slab I am having a screed to cover the UFH pipes. Unless there is an easy way. The concrete slab was usually 100 to 125mm thick. Temporary protection should be given As proven in this Celotex Floor Insulation Guide, Celotex insulation is a versatile and effective flooring insulant. Two coats will provide protection up to a maximum hygrometer reading of 95% RH. 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. DPM’s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. 16 Nov 2016. above the slab I am having a screed to cover the UFH pipes. To ensure a level finish to the floor, a layer of screed is added over the top of the concrete, which consists of sand and cement. Also checking, the dpm is meant to be underneath the insulation? Two options: - Jablite Jabfloor 70 100mm (or jabfloor 100 or 150 grade but not sure what the difference is, building merchant sells the 70) - Xthratherm/Kingspan 100mm. Most damp-proof floor coatings are applied directly to the concrete floor surface using a brush or roller. 4,049. 9. Reinforcement is required when you’re concreting areas that will be subjected to heavy loads, such as garages and car parks. Consideration should be given to applying the DPM to the top of the slab, as the installation and moisture sensitive internal finishes are then protected from any residual moisture in the concrete. Alternatively, a mechanical key for the subsequent application of levelling materials such as a screed can be created by sprinkling fine washed sharp sand or kiln dried graded quartzFintan has travelled to Baden Württemberg in Germany to study passive housing and sustainable energy technology, gaining significant knowledge regarding the use of natural insulations in timber frame and solid wall constructions. You also should have removed the vinyl tiles before priming and screeding. Vac up any loose sand once it's set and then tile. Learn More Damp Proofing 15 Items DPM Handy Pack - 300mu 1200 gauge - 4m x 5m Rating: 2 £17. Our Epoxy DPM can be used on concrete floors and fine concrete screeds, of not less than 50mm thick in the case of un-bonded screeds. If in the screed then no problem with this. As for the rest of the bungalow, I noted that there is DPM under most the sole plates of the original stud walls around the bathroom, but it's. Should I lap DPM under or over Dpc then celotex, then another DPM lapped up the wall with 25mm up stands. the screeder I use sets up a laser level and sets out his screed to that, the finish is always really good, much better than using long levels to transfer from section to section. Perhaps you could paint a liquid DPM band all the way around the bottom, or flash band skirt, stapled on to the framework, tucked under the cladding. Staffordshire. -markie-, Feb 10, 2020. The main drawback. Can you put DPM over screed? Liquid DPM is a system that is used over a base floor. This seems to have been used in abundance before the original screed was put down. Below are a few photos of the extension so far which show the dpm that’s under the slab coming up next to the opening. DPM is usually below the concrete, then the insulation, then a polythene sheet to stop the insulation floating as the screed is poured. Checkatrade offers the following guide: Electric underfloor heating cost. Figure 2: Concrete floor cast into rebate in foundation wall. Screed. #1. Applying Damp Proof Membranes. A laminate wll be glued onto that. DPMs on top of the slab, i. Put an upstand of 25mm celotex around the perimeter of the room and a dpm under the concrete lapped up the walls, being higher than the dpc won’t matter Jimmycloutnail, Jan 23, 2019 #4. 10 Feb 2020. com Do I need a DPM under laminate flooring? Simply put yes. My questions are: Is there any reason to use a roll of DPM vs a liquid. pf flooring, Jul 28, 2015 #20. For a self-levelling screed a system such as Flowcrete UK’s Hydraseal would be used. Thin screed to level old concrete floor. do I still need a DPM under that insulation? it is internal and sitting on a structural slab that is wrapped in DPM externally. Perfect for new builds and refurbishment projects, our range of floor insulation products include optimum peformance OPTIM-R Vacuum Insulation Panels (VIPs) with an insulating performance up to five times better than commonly used insulation materials, and. The subfloor in my house is a concrete slab with no DPM. The builder wants to apply a DPM to the top of the slab before it is dry. A DPM should be impermeable to water in liquid or vapour form and should be tough enough to withstand possible damage during laying of screeds, concretes or floor finishes. If I did my external one at the same height then the outside floor height would sit very low so presumably I can put the external one at the same level as. Country. The position would vary in. They can be used under resin screed finishes and are applied in thinner sections than standard cement screeds. 3. The bitumen is about 20 mm thick and, I believe, serves as moisture barrier as well as an 'appearance' finish. When we stick any floor down to the sub floor, solid or engineered, we insist on installing a liquid DPM unless the existing is guaranteed to be 100% in tact. A DPM should be impermeable to water in liquid or vapour form and should be tough enough to withstand possible damage during laying of screeds, concretes or floor finishes. Renovation property: £60 to £85 per square metre. Temporary protection should. 21m2 1. 4 Screed. 22 August 2019 at 10:27AM. Buy Now. I see some under the wood bearers, so hopefully this will keep the base dry. The DPM (Damp Proof Membrane) is laid under the insulation on top of a soft blinding to ensure it is not punctured. 100mm **concrete base*. Will prim t be okay as primer on top of turbo? Thanks PeteUnless designed otherwise, the minimum specification for all partitions should be: sill and head plates 63mm x 38mm. bandejapaisa; 30 Jun 2023; Building; Replies 5 Views 1K. Country. This is resorted to only under the duress of severe time constraint. not a good idea man. It is advisable to have a minimum of 100mm insulation covered with 60-80mm screed. 6. 1200 Gauge DPMs should be used when a floor is direct to the ground. . . This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. Out of the 7sqm of floor i guess about 1. by sound of it you could latex that floor 3x with the amount of screed you intend buying and you can't prime under a dpm or dpm over a water based screed. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. £14 per m2. 3k. So the floor has been there for 70. Before screeding can commence the area to be screeded must be made watertight to prevent leakage. Using this latex based damp proof paint as a damp p. Floor under carpet marked with chalk for wet areas. Small domestic areas that are going to have carpet, wood or synthetic floors as the final surface are ideal to use in conjunction with. 3. someone suggested removing the blocks on the inside along the width of the bifold and screeding all the way to the brick course. Can anyone advise me if this needs to be completely dried out before put the screed down? I have exposed part of the slab by removing th insulation and peeling back the upper dpm and this has slowly drie over the week but the dpm is keeping the wet in where its stil. The screed manufacturer agrees that their screed can receive an epoxy DPM. weberfloor flex is a self-smoothing floor levelling compound — often incorrectly referred to as a self levelling screed or self levelling floor compound — which can be tiled onto and is an easy screed for applying onto floor substrates subject to some movement, such as wood or underfloor heating. Seems fine so far. 3. Unbonded Sand and Cement Screed Minimum Thicknesshelppppppppppppppppppppppppp just had to quote for screed flooring. This is why first choice is always strip footings. It is good practice to either fit another DPM or tape the insulation joints, when adding a screed on top of inso'. Mot1 Sand/hardcore sub base. Insulation would be a good idea, but it also may not be a bad idea to knock the whole thing down and start again if the walls are only 4", the floor is rough, and the roof probably leaks too. Using pin m/m's on a concrete or s&c screed floor needs experience - more important is what is the composition of the slab or the in-situ screed and if there is an actual DPM below the floor. Unbonded screeds are used either to install a damp proof membrane (dpm) between the base slab and the screed or where the base slab surface is unsuitable for a bonded screed due to problems such. either way, as the other posts say, you would be better screeding which will also take out any irregularities in the concrete. But what I dont understand is what to do to. 50 /sqm. For under screed use: Must have from ground up: dpm (under subfloor in this case), insulation, plastic vapour check, sand-cement screed or fibre-concrete. not really, you said that you intended to use DPM under SLC, compound won't adhere to dpm and if will will install tiles to the SLC and it will crack your tiling will be spoiled, you can do SLC, next apply liquid DPM and install tiles to it- that's the way in my opinion. 5mm Polyflor . 2. British Standard (8204:1) says minimum 65mm for domestic floating. hallbeck New Member. The polythene damp proof membrane (DPM) – generally a 1200 gauge- can now be rolled out into place ensuring the perimeter abutments are adequately covered. In the attached photo I have removed poorly laid DPM and insulation boards with a view to starting again. These can over time allow a build up. You are talking about a solid concrete floor which has to be on load bearing stable ground. Then a DPM on top to avoid them floating in the screed. I would guess, that a standard mix was used, as that would be cheapest, so could assume 1mm per day, but that`s why a test would be needed. If the applied DPM is still very tacky, this1. Hello, I have noticed some funny things going on under the floor of our recently bought house, which was originally built in 1905. rogerk101 likes this. The option of 50mm insulation between battens is appealing. Changed mate!constructed as a separate concrete (Figure 2) or concrete masonry (Figure 3) perimeter foundation wall with the slab laid later. Care must be taken to a) ensure there are no holes or tears in the sheet that could allow. Pro-Screed Gold is suitable for application over most underfloor heating systems. M. having a solid wall causes damp bridging problems for the floor (there is a dpm on top of the floor anyway, but the beam and block is supposed to sit on a dpc) as there is no cavity. Request a callback. – the UK’s leading manufacturer of flooring adhesives and floor preparation products for the contract flooring industry. Express Liquid Screeds Limited. One thought is to plug it at the junction under the draincover and then screed round it, and lay floor over; then it can be reinstated in future if ever needed. Currently, the central heating pipes and mains water pipes are all buried below the damp proof membrane, under the screed. Acknowledgement : The Concrete Society. 10) Timber block between U channel and Cavity Weep Holes 11) Galzing unit (window/glass) 12) Tiles glued 13) Polypropylene 14) Screed 15) DPM under screed 16) Concrete slab 300mm 17) DPM under. As you are always relying on the subfloor surface strength you are always at risk if there is no sheet DPM under the floor as it will be under pressure. Under Floor Heating; Screed Care; Testing; Tips; Blog; Contact; A Practical Guide to Screed Testing: What Do the Experts Say? Download. Let the slab dry first. enquiries@visqueen. UFH inside plastic polypanels 75mm screed (probably not liquid). If its not right. Once set, you can then apply your screed flooring to the DPM. Suitable for most construction damp proofing requirements. 34. 100mm c35 concrete with mesh. If modified screed is used you can get down to 55mm. There is a membrane underneath the concrete slab which has been poured and it comes up and meets the dpc. Hi, just laying insulation on 1200g DPM and now looking for a cheap / simple VCL to lay on top of the insulation and under the screed. I'm not saying this is the best thing to use. Nice. I could put the dpm under the concrete which would be as effective. Only one coat though. The 'vapour barrier' attached to your underlay will only protect your floor from a slab reading 75% RH or less. SikaBond® Rapid DPM is a single part moisture curing polyurethane. This process is not 100% foolproof and so during screeding an extra pair of hands is useful to tuck the materials together until the weight of. 16) Concrete slab 300mm. it could easily be up and down by up to 15mm. Any existing floor screeds, coatings or adhesive residues. 1 left. 30 Jun 2023. heated levelling screeds. Ok so I have drawn the attached image. • GG500 – 500kPa. Sand / Cement screeds must have a moisture reading of less than 75% RH before work. The DPM should extend up the external foundation walls to meet. "Your insurance company should be able to instruct property drying. Ball and Co. 0. Visqueen High Performance Damp Proof Membrane. Used the primer neat as guidelines suggested. Ground-bearing concrete floor slabs should be protected against ground moisture by providing a continuous damp proof membrane (DPM). This is usually a simple 1200 gague polythene membrane and sometimes a more complex drainage membrane or liquid DPM. link with wall DPCs to form an impervious barrier to prevent moisture reaching the interior of the dwelling. screed finish over the insulation to match existing floor levels. Vac up any loose sand once it's set and then tile. This will give calculated u-value of 0. Can anyone help me with the DPM under a stud partition? What's the usual way of putting it down when you're dividing a room. Damp Proof Membranes. 14) Screed. indd 2 08/08/2016 16:50:21DPM underneath and a plastic sheet on top to stop the screed getting between the insulation panels. . Complete product range for installation, renovation and maintenance of wood flooring. You'll also need to take the dpm up the walls as well. All tiles and sand cement screed removed and last remaining suspect area. Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn,. We always remove the masonry below allowing the floor screed to have a bit of 'meat' to help overcome the differential movement. Am hoping for UFH in screed (supplied won't do 50mm, only 65mm). 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. Reinforcing concrete. also alot of the insulation manufacturers specify a 500/1000 gauge membrane between the insulation and the screed inkpad, Aug 6, 2009 #7. The extension is yanked and the architect has spec'd Marley Dampseal for the dpm which will sit under 60mm of Kingspan and 75 mm of screed. Concrete & Sand/Cement Screeds Concrete and sand/cement screeds must be dry and any laitance or surface treatments removed. How to Damp proof a floor and walls using synthaproof as a damp proof membrane is shown in this tutorial. jeds. you can then lay your celotex or similar then concrete then screed or dpm concrete insulation screed . 75m2 at 3mm, 1. It has had an extension about 50 years ago and that is the problem room as the flooring was laid without any DPM under the existing concrete floor, so there are some rising damp issues (I think). ) chrysotile (white) asbestos fibres. What’s the difference between a DPC and DPM? The DPM dries to form a permeable membrane that allows moisture to evaporate off in a controlled way. The tiler can then latex or screed over the DPM. the cut. Country. Covering it in denso tape and maybe putting some dpm over the top before screeding? Yes copper is best and lasts forever, but in this situation what would you do? So far I'm leaving towards plastic which makes like easier, less stress thinking that there are all those copper joints under the screed and underfloor heating. i'n not farmiliar with wickes dpm and the primer used for professional (if you like) screeds is neoprene. (DPM) with joints well lapped and folded. I would also gripfill under the plate to supplement the fixings if it were screed. A section of the old screed layer has broken up around the edge of the patio door threshold. Anhydrite (liquid calcium sulphate) screeds offer a number of advantages: They’re not much dearer than ready-mix sand/cement, costing around £25/m3 (laid to a 50mm depth). Wet underfloor heating. You also should have removed the vinyl tiles before priming and screeding. Prime and reapply , then screed to level and tile. 5 ratio of cement to sharp sand. He has sealed the joints as well so hopefully they won't squeak. View complete answer on allthingsflooring. Let’s hope you have a good water table as that’s the wrong dpm used. Our team of highly experienced technical experts are always on hand to provide the highest level of support and advice to our customers. Would a liquid dpm work,in past I had similar problem, I've just poured some liquid dpm in to the hole & help it with a trowel to find it's way under the concrete,seem to work as I never had damp issue when I moved indoor stop cock to new position at previous place & here when I laid new pipe under utilty floor after clay pipe failed, 10 years on, not. Spoke to makers of UFH system. The asphalt screed provides a membrane to the surface of the concrete floor preventing moisture within the constructional slab causing decay to the floor coverings. Guidance on how to install insulation between a floor screed with Kingspan Kooltherm K103 Floorboard. We have our own in-house delivery fleet of FORS Gold vehicles with Moffett mechanical off-loads delivering nationwide. Figure 1: Concrete floor slab and integral footing. 2. I was with Mapei last week inspecting a failed DPM that had been laid on a subfloor with no DPM under it. HYDRONIC UNDERFLOOR HEATING A CONCISE GUIDE FOR ARCHITECTS & SPECIFIERS ON PLANNING UNDERFLOOR HEATING SYSTEMS Introduction This guide is intended as a basic guide to the fundamentals of hydronic underfloor heating to assist specifiers to incorporate underfloor heating in their design. 2 Feb 2010. #3. Location. My query is regarding the floor insulation, damp proofing and screed. The DPM should: have sealed laps of at least 300mm wide link with wall DPCs to form an impervious barrier to. Energy Efficiency: Concrete floors generally possesses lofty thermal mass & this may be. Apply ARDEX DPM 1 C to protect the floorcovering installation from residual construction moisture and ground bearing moisture. The old floor tiles do contain a small amount of asbestos ( Marley tiles etc. POLYTHENE DPM & VAPOUR BARRIERS. They can therefore be laid under the DPM (the DPM is still necessary to prevent. It's joining onto the garage I'm converting so the whole floor is getting built up with polythene DPM,. I was planning on putting 1200g DPM down, then 80mm celotex insulation (taped at joints), then 65mm screed (approx 1. Floor screed PIR cavity board Lay, level and compact the hardcore in layers (usually 150mm min / 250mm max). New-build install: £120 to £135 per square metre. Our highly experienced team of technical experts are here to offer help and advice every step of the way! Dependable Deliveries. The liquid membrane forms a strong seal and makes a permeable layer to enable moisture to evaporate off. The screed layer is damaged by damp, and is easily disturbed/crumbled. Diagram B39 - Proper sealing. 3. I laid the conc slab badly about 6 years ago ( did the whole shed in one hit 75m2, but my workshop is athird of the shed, so 25m2 wants levelling). The 40mm between the joists is about 0. Drybase Liquid-Applied DPM should be used in situations where the final surface is going to be covered. For guidance on using DPM One Coat Membrane with screed products refer to the individual ScreedPro Data sheet concerned. e.