Information ARDEX DPM 1 C. With the number of planning applications for basement extensions rising by 183% according to research by Halifax, tilers need to be aware. Mark El-Kadhi New Member. Bostik Screedmaster Rapid DPM is a ready for use; one part, water-based damp proof membrane. Ideally I don't want to screed the floor inside now as it will primarily be a workshop so I'm trying to retain as much of the 2. 3. The only way to tell properly, is to carry out a proper test. Damp Proof Membranes. 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. 25W/m 2 K to meet with building regulations, even if you didn’t plan to. 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. This can include timber floors, tiles, laminate flooring and carpet. Packaging: 25kg bags. ← Installation of rigid floor insulation on ground floor concrete substrates to receive screed. Can be used over underfloor heating. Ultraplan Renovation Screed 3240 is suitable where good resistance to loads is required, also for castor wheel traffic and underfloor and undertile heating systems. 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. Our Liquid DPM can be used on walls under a render to create a flexible waterproof layer. . I'd like to change our tiled dining room room floor to a carpeted floor with underfloor heating. The minimum sand and cement screed thickness would be 40mm as defined by the British standard. #1. 1 tonnes per m²), which is suitable under a 75mm screed in normal domestic situations. you then have a continuous damp couse not inportant if concrete above dpc level. The surface should be of sufficient quality and. Using this latex based damp proof paint as a damp p. moisture can still transfer through the screed albeit at a slower rate. (DPM) with joints well lapped and folded. Then once the screed is dry use a liquid DPM such as F-Ball Stopgap F77. 5m2 at 1mm thickness 1. The guy doing it tried to compensate by using more adhesive and most of the wood has. £12 - £16 per m2. #1. If the coating is not going to be the final decorative surface and. This should be laid on a bedding material such as screed which doesn’t damage the sheet and has fully sealed joints. Then use the correct screed. If the property is 200 years old it won't have a DPM under the concrete slab so its sitting direct on. It needs: 100mm or more of well compacted type 1 MOT, sufficient sand to blind, DPM, insulation, screed. it could easily be up and down by up to 15mm. How to install vacuum insulation panels below a floor screed. . DPC and DPM are lapped together at this stage. Use 1000 gauge or thicker – ideal for this is the polyethylene use for the DPM under your concrete subfloor. top of my concrete slab was about 50mm below DPC, I finished with battens and floorboards. This can only normally be guaranteed if its an new build or extension and most houses have been sold, inherited etc. Magnesite must be completely removed. Performance can be significantly affected if the liquid DPM does not adhere to the base layer properly, therefore careful preparation must be done to make sure that the receiving surface is level and free from debris. £18 - £22 per m2. Concrete & Sand/Cement Screeds Concrete and sand/cement screeds must be dry and any laitance or surface treatments removed. 0. #5. The dpm is extended and taped around this opening. Trusted Trader, said safety must be a priority after a flood. He has sealed the joints as well so hopefully they won't squeak. DPM Membranes for Concrete Floors A range of high quality DPM membranes from Capital Valley Plastics, designed for use with solid concrete slabs. i'm you have gathered by now, you havn't left enough depth to do this. #2. 20m2, 50mm = 0. When sand-blinded, BAL DPM allows tiling onto difficult substrates such as steel. The bitumen adhesive also contained the same asbestos fibres. As an alternative to under concrete or surface damp-proof membranes a damp-proof membrane may be sandwiched between the site concrete and the floor screed, as illustrated in Fig. 2) 25mm - Celotex TB3000 Insulation Board. However the tiler should apply a Primer before screeding such as StopGap P141. DPM’s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. Brian shows how to correctly fit a Damp Proof Membrain - DPM in a new build houseLink to the T-Rex tape Website Http://bodgeitwithbri. Bonded Screed Maximum Depth. Right based on those joist spacings and dimensions the joists should easily accept 1. weberfloor DPM is a two-component epoxy based chemical damp proof membrane that is capable of being applied in one coat, dependent upon the condition of the substrate and quality of workmanship to ensure full coverage is achieved at the required thickness. 14 assuming 0. Just lap the whole room up as normal, blobs of. Reaction score. Express Liquid Screeds Limited. 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. weberfloor DPM is a two-component epoxy based chemical damp proof membrane that is capable of being applied in one coat, dependent upon the condition of the substrate and quality of workmanship to ensure full coverage is achieved at the required thickness. Am hoping for UFH in screed (supplied won't do 50mm, only 65mm). Mark El-Kadhi New Member. 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. Through DPM of course so a bit of silicone down the screw hole to seal the hole. Your privacy. It would have taken a lot of screed to make up the level - about 36 bags. Price: £4. Guidance on how to install insulation between a floor screed with Kingspan Kooltherm K103 Floorboard. rogerk101 likes this. #1. Is it possibly to lay a new insulated floor without a concrete slab, using only floor screed? For example: Level layer of hardcore; Layer of sand blinding; Damp proof membrane. The rest of the floor will be as follows (top down); flooring. 3) 50mm - Screed with Concrete Fibres, on top of the insulation boards. If you are using a final floor finish which will be fixed to the screed’s surface using an adhesive then you will need to lightly sand the laitance off the surface of the screed before using a compatible primer and adhesive. #5. Care must be taken to a) ensure there are no holes or tears in the sheet that could allow. Kingspan GreenGuard is available in a range of compressive strengths starting at 300 kPa 10% compression. The reasoning behind the 'sub-base:bedding' school of thought is that the membrane prevents the bedding from trickling down or being washed into any voids within the sub-base material, while the 'sub-grade:sub-base' orthodoxy, in which I include myself, maintains that keeping the sub-base material from mixing with the sub-grade, and reducing or. Country. 17 May 2010. The advantage of having the foundation. will come down and meet the insulation under the screed so the screed is totally floating. Im not quite sure where my DPC should be going. Pro-Screed Gold can be applied from depths of 2mm to 12mm in one application and with aggregate it can be applied up to 30mm thick. •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. Unfortunately soon after it was laid it started crumbling and holes were appearing in places, as electricians and plasters came in to do their work and walked all over it, they did put black sns plastic sheeting down to protect it though. royaloakcarpentry Senior Member. The tiler can then latex or screed over the DPM. 13) Polypropylene. 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. Checkatrade offers the following guide: Electric underfloor heating cost. He intended to stick the floor to the bitumen DPM. Complies with BS 8485:2015 + A1:2019 - industry standard for methane and carbon dioxide protection. But on the basis of more insulation is better, consider fitting more and laying cupboard flooring on top, or on joists. If the DPM is still wet you should have not tiled over. Said he'd provide a quote but didn't come back to me. 100mm **concrete base*. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. user contributions licensed under CC BY-SA. If the wall is very dusty I'd go round with the henry as well. Scaffold boards should be used for barrowing and tipping concrete and screed and a light mesh of chicken wire can be used over separating layers or dpms over insulation under screeds as added protection. DPM under block and beam. Apply sand-blind base (this base should be level to within 5mm along any 3m straight edge). "Remove water with pumps or buckets and contact your insurance company straight away. You should use them to protect all final floor finishes. An expansion gap may be necessary around the edge of the floor finish in screed or. 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. Preparation is key with these coatings and the substrate must be sufficiently clean and dry. This is why first choice is always strip footings. hallbeck, Jan 26, 2010 #5. 4 Apr 2017. DAMP PROOF MEMBRANE. Most damp-proof floor coatings are applied directly to the concrete floor surface using a brush or roller. heating installations with cementious screeds provided a temperature of 27°C is not exceeded. Before screeding can commence the area to be screeded must be made watertight to prevent leakage. The. As you would expect, you need as much heat as possible to flow upwards and into the room. I'm looking for opinions on the best self leveling screed to use on my slightly wonky concrete garage floor. Insulation is laid on the concrete and covered with a screed. 1. Top. Alan Jackson - Commercial Manager UK and Ireland - Gypsol. Insulation must be provided under their entire area to ensure compliance with the Building Regulations is achieved. The concrete slab was usually 100 to 125mm thick. 11 Protection against heat, and BS 8204 Part 1 2003, Section 6. 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. 8mm2 at 6mm 1. Effectively a thick plastic sheet, a damp proof membrane (DPM) is used to create a barrier between a concrete (or screed) subfloor and a wood floor. The concrete slab was usually 100 to 125mm thick. The subfloor. Mine is below the concrete. They are happy for the 25mm board to be laid on the screed, pipes clipped in then 9mm ply on top finally topped off with ceramics. For unbonded and floating screeds, a DPM may be specified between the base slab and the screed. (DPM) between the concrete and screed. Fig. An ARDEX Damp Proof Membrane will protect the floorcovering. sandwiched under the screed, were also common and usually in liquid form, e. To remove this type of asbestos containing floor. This will allow the screed to. Use polyethylene sheeting to create a waterproof membrane to ensure that there is no leakage of the screed when it is pumped in wet. Cement screed. now what i know of screeding is very little but i can do a good job i have used in the past chicken wire under floor insulation, slurry coats on concrete etc but the guy who wants the job doing is going on about a barrier around. I am the Managing Director of the Multi-Award Winning Speed Screed. I intend to lay 75mm PIR. Trustpilot. You will need to tear the lot up. Visqueen 2000 gauge Polythene - 12. The 40mm between the joists is about 0. Or have you asked them can you install Surface DPM on a Wet subfloor that does still have a DPM under it? Don't confuse the TWO. Liquid DPMs gave the best protection but were more expensive. For bonded screeds, M-Bond Extra epoxy resin combined DPM and bonding agent may beToday, new solid floors are far more substantial, typically comprising 150mm of compacted hardcore, 50mm of sand, a polythene sheet DPM, 100mm of concrete, then around 100mm of insulation plus a 60mm screed — in total, more than 450mm thick. Reinforcing concrete. I want to level my workshop floor. 14) Screed. 21 Sep 2016. We have our sub concrete floor in, and there will be a 1200g dpm, then 100mm insulation, then another dpm and finally 65-70mm screed. You now have a 'swimming. But others are direct to earth, brick, rubble what ever. It offers thermal conductivities as low as 0. The screed manufacturer agrees that their screed can receive an epoxy DPM. g. 34 dpm under insulation and screed. screed finish over the insulation to match existing floor levels. 30 Jun 2023. The oversite is then constructed internally along with polythene DPM, insulation and floor screed etc. 28. 3. Sand / Cement screeds must have a moisture reading of less than 75% RH before work. Warm water underfloor heating. 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. Size is 4m x 4m. Installing floor insulation boards above the concrete slab and below the floor screed is an effective insulation method particularly for underfloor heating systems where the underfloor heating pipes are contained within the floor screed. I am assuming its asphalt with a bitumen top layer, 10-15mm thick. Apply ARDEX DPM 1 C to protect the floorcovering installation from residual construction moisture and ground bearing moisture. 5kg multi chamber bags. Moisture in the base will impede the drying of the screed. I could put the dpm under the concrete which would be as effective. Country. Scaffold boards should be used for barrowing and tipping concrete and screed and a light mesh of chicken wire can be used over separating layers or dpms over insulation under screeds as added. Can be used as a Damp Proof Membrane on sub-floors not under hydrostatic pressure. It originally had Marley tiles stuck down with bitumen 'glue', but many of them are missing and I will remove the rest. The screed has water anyway, so a bit of ingress isnt an issue. So latex one its more likely the addy will be affected. framing joints secured with not less than 2 nails per joint. A water based is more likely the screed itself will blow as it cant take moisture at all, so it would be the 1st thing to blow. Insulation Below A Floor Screed. Only one coat though. If under the screed this is normally a polythene dpm so the screed is then an unbonded screed, whereas if the dpm is on top of the screed an epoxy-type dpm is used. 4,049. Can you put DPM over screed? Liquid DPM is a system that is used over a base floor. In order to prevent damp rising through the concrete floor and causing issues, a DPM should be used under all final floor types including wood flooring, laminate, vinyl and floor tiles. Based on a screed done in 1963 I’d say 95% there won’t be a effective damp proof membrane under it so a epoxy dpm should of been used like Ardex DPM1c. As nod mentioned, your DPC will actually be the first layer of DPM you put down bef ore the insulation. It is advisable to incorporate a light mesh within the raft for reinforcement. Our quarry tiles were pretty much laid on dirt so there were some big variations in height over the whole kitchen. There is a concrete slab in place with a DPM underneath. 100 hardcore, 50mm builder's sand to blind, 1200 gauge DPM, 70mm insulation (Celotex, Kingspan, etc. Ideal for use where there is no functioning structural DPM (common in older properties). Dig the oversite ground to whatever height allows your hardcore, insulation, blinding, slab,screed. C. with the concrete but the insulation. Currently, the central heating pipes and mains water pipes are all buried below the damp proof membrane, under the screed. It is advisable to have a minimum of 100mm insulation covered with 60-80mm screed. I recently had a new boiler installed and new radiators fitted, and the plumber has cut the old copper. 1200g dpm. That seems to be the recommended practice but I'm not sure how many bother with the one on top. Lay and level the concrete slab, allowing sufficient time to dry out, as per BS 8203. Spoke to makers of UFH system. DPC and DPM are lapped together at this stage. Then mix up the high performance stuff as that is fibred and can be taken to a feather edge. Staffordshire. Made from recycled materials. 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. com Do I need a DPM under laminate flooring? Simply put yes. 1 or just a bit less. It may be applied onto either a solid in-situ concrete ground floor slab or onto a precast concrete floor unit. Guidance on how to install insulation between a floor screed with Kingspan Kooltherm K103 Floorboard. Non-structural floor screeds shall be adequate for the location and intended use, and provide a suitable background for floor finishes. Our expert team are ready to offer you the very best solution for waterproofing. Step 3: Lay the watertight membrane. Which type of coating is chosen will depend on the intended use of the floor. 1: Fill the gaps with concrete and get an asphalt company to lay an asphalt screed over it to restore the DPM. Some houses in early 70s don't have a DPM as I've found out over the years. CS Flooring. 6 March 2017 at 8:04PM edited 6 March 2017 at 8:59PM. I was then able to put in a dpm and a hefty layer of cellotex and then screed to the level of the house. Complete range, complete solution. 22) Steel. Country. Applying Damp Proof Membranes. 1 Feb 2010. flooringman Well-Known Member. 22 August 2019 at 10:27AM. The plan was to lay American Black Walnut but the hallway floor was not level. 50 /sqm. 6 March 2017 at 8:04PM edited 6 March 2017 at 8:59PM. Onto the concrete. You need a flooring professional to use an epoxy liquid DPM and screed suitable for this area and is not a job you should think to attempt 1 pinhole is a failed floor. Produced from Recycled Material. 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”. Try it free. 4m x 50m x 500g (200sqm) Black Polythene Vapour Control layer 4m x 25m (100sqm) TPS. 21. The work falls under building regs part L and you need minimum 70mm PIR insulation. Fintan has been involved extensively in a deep energy retrofit of a property to the Enerphit standard in the west. This will. TB243. Air bricks are. 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. Now we realise this cannot be done and are trying to get out of a fix. There will be a damp-proof membrane under the insulation and possibly a second membrane on top, depending on the type of screed. Which is supposed to be a DPM equivalent. In this article, I am going to give you the low-down on liquid DPM, where and how it is used and some of the things you need to consider. 4 so you have around 1. Figure 3: Concrete masonry foundation wall and concrete floor. What do think? What if we're pouring one of these strong self. The DPM (Damp Proof Membrane) is laid under the insulation on top of a soft blinding to ensure it is not punctured. No need for double DPM. Location. DPM's must be carefully protected where folded up the perimeter walls, and lapped under the DPC particularly at door openings. Nice. I always put the Celotex under the slab to ensure that it doesn't deteriorate between laying it down and screeding. The maximum depth you would use a smoothing compound would generally be around out 10mm, you can add aggregates, to bulk up the screed going up to 30, 40, 50+mm. 17) DPM under slab. Small domestic areas that are going to have carpet, wood or synthetic floors as the final surface are ideal to use in conjunction with. Yes run the dpm up the wall to connect wall dpc with floor dpm. Norfolk. Laying new floor - needs DPM? dunroving Posts: 1,881 Forumite. also alot of the insulation manufacturers specify a 500/1000 gauge membrane between the insulation and the screed inkpad, Aug 6, 2009 #7. 0m is a low density polythene membrane for use under floor screeds which are not subject to hydrostatic pressure, to protect buildings against moisture from the ground. insulation 60mm. do I still need a DPM under that insulation? it is internal and sitting on a structural slab that is wrapped in DPM externally. do I still need a DPM under that insulation? it is internal and sitting on a structural slab that is wrapped in DPM externally. Issues to be taken into account include: installation. Do your slab as intended, single course of brickwork around the perimeter, then build your frame. Brian shows how to correctly fit a Damp Proof Membrain - DPM in a new build houseLink to the T-Rex tape Website Http://bodgeitwithbri. Seems fine so far. LAY DAMP PROOF MEMBRANE. When I origianlly pulled it up it was damp under the bitumen screed/dpm around some cracks in the slab (guess trapped moisutre was trying to escape there), it dried in about 10-15 minuntes and has been done dry and. DPMs on top of the slab, i. 90 per pack | Buy now from UK Flooring Direct. The polyethene slip membrane installed over the insulation must be overlapped and sealed to prevent loss of screed. 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. Don't use a bitumen at all, you are correct eventually your screed will fail. A damp proof membrane (DPM) is used to create a barrier between a concrete (or screed) subfloor and the floor covering that is laid on top such as wood, ceramic or quartz tiles, laminate or carpet. Effectively a thick plastic sheet, a damp proof membrane (DPM) is used to create a barrier between a concrete (or screed) subfloor and a wood floor. 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. Hi All, I'm purchasing a new build and want to put Amtico Spacia down throughout the downstairs. Issues to be taken into account include: installation. 5mm Polyflor . DPM, Celotex, 1000 gauge poly, 100-150mm concrete with or without reinforcement, 50-80mm screed. 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. I am happy to employ gs guy to do pipe and install boiler but don't want to be calling the guy several times months appart, hence the attempt to make. studs 63mm x 38mm at maximum 600mm centres. The liquid membrane forms a strong seal and makes a permeable layer to enable moisture to evaporate off. Damp proof membranes (DPM) A DPM should be a minimum thickness of 1200g polythene and linked to the DPC with a minimum 100mm overlap. •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. Cutting open would void dpm so should be avoided. hot bitumen, or cold bitumen in solution. All modern buildings have what is known as a Damp Proof Course. I would think a strip out and start again would be your best option, you should consider where/why there is water evident before. In terms of where the insulation should be placed, it can either be placed under the slab or between the slab and the floor screed. Alan Jackson - Commercial Manager UK and Ireland - Gypsol. A standard sand/cement screed would need to be laid at a minimum depth of 65mm for a domestic property. Roger Kenworthy on 2021-08-13 17:59:40: Question:Durability: A befittingly developed floor screed will outlast the else modules of the building. 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. You could asphalt but it will eventually fail one day and you'll need to do it again although it is the cheaper immediate option. I'm not saying this is the best thing to use. There needs to be one under the beams that rest on the internal wall. A full sheet DPM is 250 microns (1000 gauge) thickness or above. You also should have removed the vinyl tiles before priming and screeding. 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. With a laser. New-build install: £50 to £75 per square metre. so FBall seems the way to go). My DPM was these tiles that were bitumnned/black jacked to the floor. P. J. you might just have a low spot along the old wall where the concrete meets the wooden floor. Depends where the UFH pipes are. 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. A Damp Proof Membrane or DPM is a waterproof barrier that’s introduced between your sub floor and your wood floor. 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. Description. A suitable gauge damp proof membrane (DPM) and thermal insulation must be provided. POLYTHENE DPM & VAPOUR BARRIERS. So I have a concrete floor in the kitchen (concrete - DPM - 50mm screed), knocked through into the outside toilet which just had soil floor. There are two main options: 1. 30811761. Visqueen EcoMembrane DPM. To avoid such issues, it is therefore extremely important to make sure that the screeds are given sufficient time for drying. The basic screed construction for under floor heating systems generally follows the ‘floating’ screed construction, where a Damp Proof Membrane (DPM) and tacker insulation panels are laid over the. You'll also need to take the dpm up the walls as well. In both cases the surface on which the dpm is laid needs to be as smooth as possible. Wet underfloor heating. Flowable liquid floor screed suitable for applying up to a depth of. I would use 100mm x10mm frame fixings, especially in screed because it is weak. Registered Office: 6 Acre Close, Rustington, West Sussex BN16 3PG. For a self-levelling screed a system such as Flowcrete UK’s Hydraseal would be used. Celotex PIR’s closed-cell, moisture-resistant composition helps to prevent water ingress. DPM (1200 gauge visqueen) Old Concrete Slab. Diagram B39 - Proper sealing. phatboy. studs 63mm x 38mm at maximum 600mm centres. 16) Concrete slab 300mm. The dpm is still continuous but laid down in the trough to maintain damp proofing. I was planning on putting 1200g DPM down, then 80mm celotex insulation (taped at joints), then 65mm screed (approx 1. 2. Our highly experienced team of technical experts are here to offer help and advice every step of the way! Dependable Deliveries. Reinforcement is required when you’re concreting areas that will be subjected to heavy loads, such as garages and car parks. My query is regarding the floor insulation, damp proofing and screed. However to get BC off your back you can use a epoxy DPM and sand scatter it before it sets. 8 Apr 2013. 19 Jul 2015. Then use the correct screed. The liquid membrane forms a strong seal and makes a permeable layer to enable moisture to evaporate off. i'n not farmiliar with wickes dpm and the primer used for professional (if you like) screeds is neoprene. But too much water will extend the drying time and. Out of the 7sqm of floor i guess about 1. Curing under polythene 12 hrs 12 hrs Drying time to receive finishes - from removal of curing polythene sheet 50mm thickness and 50% RH. Location. 00 per roll. below this liquid screed I am adding 50mm EPS100 to build up the depth (which reduces the thickness of the screed) and also to fix the UFH pipes to. TF. 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. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. DPM sheets should be overlapped by at least 300mm. SikaBond® Rapid DPM is a single part moisture curing polyurethane. This is done to maintain energy efficiency and prevent. This barrier is intended to stop moisture passing from one to the other. Sunny Hampshire. But if you’re on a tight schedule, allow at least 7 days before applying your vinyl floor covering. if your DPM were above the concrete, the uFH would be heating a large damp lump of concrete. Buy Now. Cement screed is the most commonly installed type of screed and is suitable for both interior and exterior surfaces. My question is thoughts on floor layout. A traditional sand and cement screed is normally a 1:4 or a 1:3. They left the bitumen glue on the floor (apparently, this is often ground off before laying screed), and applied PVA to seal the bitumen, which also contains small amounts of asbestos.