i'n not farmiliar with wickes dpm and the primer used for professional (if you like) screeds is neoprene. 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. We could scrape up the tiles and start again. 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. CSC screeding was very efficient that they screeded our floor in under 4 hours (around 91sqm) with the help of the Mixamate. I am assuming its asphalt with a bitumen top layer, 10-15mm thick. Then once the screed is dry use a liquid DPM such as F-Ball Stopgap F77. For unbonded and floating screeds, a DPM may be specified between the base slab and the screed. 50 /sqm. above the slab I am having a screed to cover the UFH pipes. Pro-Screed Gold is moisture tolerant and can be used under and over DPM’s. Lay and level the concrete slab, allowing sufficient time to dry out, as per BS 8203. £20 per m2. Unless there is an easy way. Insulation Below A Floor Screed. A standard sand/cement screed would need to be laid at a minimum depth of 65mm for a domestic property. Renovation of more than 25 per cent of a solid or suspended floor involving the replacement of screed or a timber floor deck would have to meet the standards required by the building regulations Approved Documents. This can only normally be guaranteed if its an new build or extension and most houses have been sold, inherited etc. g. 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. 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. 1200g DPM will be fine. Which is supposed to be a DPM equivalent. 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. Hi guys. Brian shows how to correctly fit a Damp Proof Membrain - DPM in a new build houseLink to the T-Rex tape Website Http://bodgeitwithbri. screed. 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. 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. 6. Just lay a couple of good thick beads on the dpm and stick it to the wall. Renovation property: £60 to £85 per square metre. 3. Installation systems for tiling and natural stone. Capital Valley Plastics Ltd Damp-Proof Membrane Black 1200ga 25m x 4m (47163) (55) compare. Discussion in ' Builders' Talk ' started by barnjules, Jan 30, 2017 . Step 3: Lay the watertight membrane. ), then 500 gauge plastic (or just use the leftover 1200 gauge DPM) then 100mm concrete slab. Step 3: Lay the watertight membrane. 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. The only way to tell properly, is to carry out a proper test. If there is an operational DPM beneath the concrete you don't need one on top. At the junction of wall and floor the membrane overlaps the damp-proof course in the wall. If it is the above type of screed and the latence hasn't been ground off, the screed won't be dry and will only start drying when the latence is taken. The best example of insulated floor thickness is 100mm (insulation) + 60mm (screed) + 20mm (floor tiles+adhesive). Concrete & Sand/Cement Screeds Concrete and sand/cement screeds must be dry and any laitance or surface treatments removed. Hi All, I'm purchasing a new build and want to put Amtico Spacia down throughout the downstairs. 3 Oct 2004. To add to this, when we bought the house about 6 months ago the existing felt roof (on the extension) had a gaping hole that was letting rain water. Fibreglass 1. Size is 4m x 4m. At the moment, there is a dpm under the patio door overlapping the cavity and meeting the main dpc which comes up from the slab and wraps around the inner bricks. 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. DPM is normally used in floors. bandejapaisa; 30 Jun 2023; Building; Replies 5 Views 1K. Use a thick bed adhesive unless your competent to use screed, it takes skill and practice to create a flat floor. Brief background: After buying a 1960s semi in south Birmingham house last year, and spending the summer managing (a) complete rewire; (b) installation of satellite and Ethernet wiring to all rooms; (c) plastering to make good chasing from (a). M. Buy Now. Drybase Liquid-Applied DPM should be used in situations where the final surface is going to be covered. How to Damp proof a floor and walls using synthaproof as a damp proof membrane is shown in this tutorial. 25W/m 2 K to meet with building regulations, even if you didn’t plan to. However the chance that the floor tiles or adhesive can release fibres and become respirable when disturbed is very low. They can feel wobbly when you walk on them but you get to the point when you can't get them any better and each give you walk on them or lift them you end up going around in circles. apparently some of the screeds had a cold or hot bitumen in or under them. 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. Through DPM of course so a bit of silicone down the screw hole to seal the hole. 6 March 2017 at 8:04PM edited 6 March 2017 at 8:59PM. 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”. Use 1000 gauge or thicker – ideal for this is the polyethylene use for the DPM under your concrete subfloor. The installation of the DPM is extremely important as this acts as a barrier to prevent damp rising up through the substrate, from the ground below. Hi, I'm doing a kitchen modernisation in my ex-Council house which was built in 1947. What the DPM is attached to can fail. Damp Proof Membranes. 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 was then able to put in a dpm and a hefty layer of cellotex and then screed to the level of the house. Damp proof membranes (DPMs) can be used to help resolve damp issues which already exist or to avoid damp or moisture problems in. Trustpilot. 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. 12 Sep 2015. Discussion in ' Builders' Talk ' started by Liz990, Feb 21, 2021 . Temporary protection should be given As proven in this Celotex Floor Insulation Guide, Celotex insulation is a versatile and effective flooring insulant. Get it level then when it is dry and can screw through floor board into blocks. 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. Reinforcement is required when you’re concreting areas that will be subjected to heavy loads, such as garages and car parks. If DPM ok then. water will be likely to collect between the DPM and the old floor. Unbonded Sand and Cement Screed Minimum Thicknesshelppppppppppppppppppppppppp just had to quote for screed flooring. Some houses in early 70s don't have a DPM as I've found out over the years. concrete slab. For example, when installing Celotex under floor. That about sums it up, but if your DPM is also serving as a radon barrier (even in a low risk area) the DPM should lap across the cavity (with a downstand) to seal the cavity from radon. 5mm Polyflor . Insulation is a crucial consideration for UFH. Doggit. The concrete slab was usually 100 to 125mm thick. Posted July 28, 2021. •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. The main drawback. #1. the cut. Depends where the UFH pipes are. screed thickness. The membrane is manufactured in standard 125mu, 250mu, and 300mu thickness and in roll sizes of 1. Polycote DPM Primer is a superb twin pack high-performance epoxy coating that. "Document any damage for insurance purposes. Lay the damp proof membrane (DPM) (normally 1200g polythene sheet/300g micron or a radon barrier if specified), over the sand-blind base. 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. 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 concrete substrate before laying the heating elements of the under floor heating system. Diagram B38 - DPM lapping under DPC for thickness of inner leaf. As you would expect, you need as much heat as possible to flow upwards and into the room. Pro-Screed Gold is suitable for application over most underfloor heating systems. When it comes to the hearth I know that I need to have a constructional hearth at least 125mm thick that extends out 300mm in front of the stove. Made from recycled materials. We've just had our garage converted and our builders have laid a screed floor. An ARDEX Damp Proof Membrane will protect the floorcovering. hallbeck New Member. So he said to put the insulation on top of the slab. The floor is concrete slab, 100mm Kingspan PIR, DPM and then 70mm screed. DPM over a new underfloor heated screed, the heating system must be turned off 48 hours before application. I'm not saying this is the best thing to use. 90 per pack | Buy now from UK Flooring Direct. Then use the correct 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. 14) Screed. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. We always remove the masonry below allowing the floor screed to have a bit of 'meat' to help overcome the differential movement. Beam and block floors may need a levelling screed or grouting to ensure base level. 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. Can be used over underfloor heating. . The advantage of having the foundation. But if you’re on a tight schedule, allow at least 7 days before applying your vinyl floor covering. Some slate or concrete board should then bridge the cavity gap. Ball and Co. By definition, Relative Humidity (RH) is a measure of the amount of water vapour present in the atmosphere relative to the amount of water vapour it can hold at that given temperature. the advice by these two posters is absolutely incorrect, if your RH% is above 75% you absolutely need a surface dpm and dual screed the test takes 72 hours to take though, depending on size the price you were quoted is reasonable (surprisingly from Carpetright), there are certain BS you must follow for correctly preparing a sub. Solid floor insulation –screed finish: Per m 2: £70: £90: £80: Labour: Per day: £180: £250: £215:. A typical beam and block application would have beam and block 100mm depth, insulation between 150-300mm and screed 65-75, a total floor depth of between 325-475 which could require as many as three extra rows of brickwork. 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. • To provide a wearing surface. Made from a combination of sand, cement and water, usually in a sand/cement mix ratio of anywhere between 3:1 and 5:1. . The screed layer is damaged by damp, and is easily disturbed/crumbled. The DPM should come up in an upstand and tie into the DPC on the. 5kg multi chamber bags. Resin and cementitious floor finishes combining performance and design. the advice by these two posters is absolutely incorrect, if your RH% is above 75% you absolutely need a surface dpm and dual screed the test takes 72 hours to take though, depending on size the price you were quoted is reasonable (surprisingly from. 21m2 1. The screed will be only ~50 max (not yet dug any up). I moved into my new build nearly 2 months ago now and am having quite a few issues. The excellent adhesive qualities and quick drying time of Drybase Liquid-Applied DPM make it extremely versatile. 8 Oct 2015 #4 So you have a concrete slab laid on a DPM, and later a 65mm sand & cement screed laid on the Extn. I was with Mapei last week inspecting a failed DPM that had been laid on a subfloor with no DPM under it. Used the primer neat as guidelines suggested. Yup so the plan is: Existing garage is concrete which is a 75mm lower than the current house level. This will allow the screed to bond to the dpm. Im not quite sure where my DPC should be going. Effectively, a damp proof membrane (DPM) is used to create a barrier between a concrete (or screed) subfloor and a wood floor. above the slab I am having a screed to cover the UFH pipes. pf flooring, Jul 28, 2015 #20. This DPM is a ‘thick’ plastic sheet mostly 1000 – 1200 gauge polythene material. i'm you have gathered by now, you havn't left enough depth to do this. 21 Sep 2016. Ideally there should be a fully working dpm under the main concrete slab but where this does not exist or where the time for the slab to dry out sufficiently is longer than the building programme can permit, a dpm can be included either above or below the screed. Fast drying screed cost. Damp proof membranes (DPM) A DPM should be a minimum thickness of 1200g polythene and linked to the DPC with a minimum 100mm overlap. 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. For unbonded and floating screeds, a DPM may be specified between the base slab and the screed. Do you need DPM under screed? What DPM is Required? If the hygrometer reading comes back above 75% relative. Give it a good wipe with a damp cloth and let it dry before you start. 34 dpm under insulation and screed. #1. 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 the. The dpm is still continuous but laid down in the trough to maintain damp proofing. Country. The previous concrete floor failed due to a lack of DPM and has now been removed. If the DPM is still wet you should have not tiled over. #5. 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. I recently had a new boiler installed and new radiators fitted, and the plumber has cut the old copper. It is essential that this. It should be waterproof to prevent any rising damp getting through. fix battens to subfloor - I can't raise the floor height with battens on the screed, but I could lift and remove the 50mm screed layer, fix 50mm battens at 400mm centres direct to the concrete slab, and then boards fixed on top of the battens. 2m3). View complete answer on allthingsflooring. Will prim t be okay as primer on top of turbo? Thanks Pete Unless designed otherwise, the minimum specification for all partitions should be: sill and head plates 63mm x 38mm. 67. For guidance on using DPM One Coat Membrane with screed products refer to the individual ScreedPro Data sheet concerned. Brian McNaughton & Son Ltd. A latex based screed isnt as affected by moisture/damp as a water based is. Damp Proof Membrane is intended for use within solid concrete floors to prevent the rise of moisture or damp through structure flooring. Pricing. I intend to consult BC but would like to educate myself before I speak with them Thanks in advance. TB243. would it beneficial to change the floor structure to incorporate circa 250mm of eps insulation under the concrete slab, instead of the 150mm pir above. USES For priming, consolidating and sealing of: Absorbent and non-absorbent sub-floors, consolidat-ing weak cement screed and isolation of old adhesive residues. Norfolk. not bonded to the base – typically where a DPM is placed under the screed. RFC Liquid Damp Proof Membrane (DPM) is a professional 2-component applied surface primer. My house has a solid screed floor throughout the downstairs, with a Damp proof membrane about 100mm down. Greater thickness of screed may lead to a colder floor. Hi I have fibreboard underlay in the instructions for the underlay it states if using this product on ground floor you should also use vapour barrier or damp proof membrane beneath the underlay. blocking/nogging for support of plasterboard 43mm x 38mm. com. C. 1: Fill the gaps with concrete and get an asphalt company to lay an asphalt screed over it to restore the DPM. jeds. uk ;. With a laser. First, divide the floor up. Water under tiles. Screed. 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. 4m x 50m x 500g (200sqm) Black Polythene Vapour Control layer 4m x 25m (100sqm) TPS. Vac up any loose sand once it's set and then tile. The flooring that’s going down is polyflor safety flooring it’s. 0. You can usually achieve this with at least 100mm of good quality foam insulation or 150mm of mineral wool insulation, but this figure will vary depending on the make-up and size of your. 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. 2 Feb 2010. 100mm **concrete base*. Warm water systems, such as those available at The Underfloor Heating Store, feature an array of pipes, laid just below the surface of your floor. But too much water will extend the drying time and. 100 hardcore, 50mm builder's sand to blind, 1200 gauge DPM, 70mm insulation (Celotex, Kingspan, etc. If you are installing where existing floors have been removed, check that there are no traces of previous adhesive residue. What is liquid DPM? Liquid DPM is a system that is used. There’s also ridges from where the tiles used to be. 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. Temporary protectionI had part of a 9" wall knocked down for a doorway. Do you need DPM under garage floor? Solid floor The existing concrete floor can be used as a base, however a new damp proof membrane (DPM). Information ARDEX DPM 1 C. DPM sheets should be overlapped by at least 300mm. This can include timber floors, tiles, laminate flooring and carpet. Kitchen floor, underfloor heating, screed and DPM. 00 per roll. 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. Care must be taken to a) ensure there are no holes or tears in the sheet that could allow. If there is an operational DPM beneath the concrete you don't need one on top. This reduces the risk of harmful interstitial condensation by ensuring that any moisture within the. It is usually abbreviated to 'DPC', and in most buildings less than 30 years old, it consists of a DPM, which is a Damp Proof Membrane, an impermeable layer of material, most often a polyethylene or bitumen-polymer, that is laid in the bedding joint between two courses of bricks. DPM sheets should be overlapped by at least 300mm. Let the slab dry first. Guarantees the early laying of all floorcoverings. UFH inside plastic polypanels 75mm screed (probably not liquid). Air bricks are. 3. 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. The idea is that you are to prevent any screed material from falling down any joints and coming into contact with the cold slab. Which way would you go, 1000 gauge plastic under slab OR liquid dpm between slab and screed? renovateduk, Jul 17, 2009 #3. #5. You will need to tear the lot up. UZIN has the right floor damp proof membranes for damp proofing floors. These can over time allow a build up. New-build install: £120 to £135 per square metre. All tiles and sand cement screed removed and last remaining suspect area. If the concrete in-fill is low, after patching the DPM, putting the screed on it will cause the centre of the DPM to drop and pull away at your new seal around its. . Fit a damp proof membrane as above, then lay a separation layer. Ground-bearing concrete floor slabs should be protected against ground moisture by providing a continuous damp proof membrane (DPM). Anyway, my DPC/DPM seems to have been done wrong, but I just wanted to ask what I should do next to make it work. 6 March 2017 at 8:04PM edited 6 March 2017 at 8:59PM. My questions are: Is there any reason to use a roll of DPM vs a liquid. I've dug down and exposed part of the DPM sheet under the slab so I'm happy using trade plan, turbo then renovation screed. Try it free. 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. You also should have removed the vinyl tiles before priming and screeding. #2. Once set, you can then apply your screed flooring to the DPM base. 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. 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. The floor originally had a carpet laid on top of the tiles, when I lifted it nothing felt, looked or smelled damp. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. Like x 2; Agree x 2; List (You. #2. 5. 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. Country. The dpm has added to the problem by removing any bonding capabilities within the floor screed. The old adhesive should of been removed. For a self-levelling screed a system such as Flowcrete UK’s Hydraseal would be used. California Country. The Epoxy DPM 5kg is supplied in two 2. Traditional screeds. Thanks for the reply. rogerk101 likes this. 001 Ardex Australia 2015 Bulding regs would require 100mm insulation and 70mm reinforced screed for this. Apply ARDEX DPM 1 C to protect the floorcovering installation from residual construction moisture and ground bearing moisture. T ·Öà 4 ·Öò 8 ·Ñ• 2, Jun 15, 2007. 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. When applied on top of screed, it needs to have a further coating to protect it from damage such as laminate, tiles, vinyl, wood and carpets. 21) Timber block. Do you know whether the fitter did any kind of damp proofing under/on top of the screed? And have you had any damp problems since then?Screeds – general. Misinformed on this as he had put a dpm under the chipboard. Is this okay? Or does this present a real risk of corrosion of the frame in the future?that's rising damp mate, need to dig up subfloor new concrete base, dpm leave 30 days then screed and surface membrane that should help fix the problem. it could easily be up and down by up to 15mm. 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. £12 - £16 per m2. 4 so you have around 1. Yes. Trusted Trader, said safety must be a priority after a flood. 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. You now have a 'swimming. 3k. It is not. Liquid DPM for Walls. Find. Looking for best method to both level and damp proof the concrete, to then be covered with a thin layer of celotex, then engineered wood. The heating must be switched off at least 48 hours before and after application Bostik Screedmaster One Coat DPM and Bostik Screedmaster One Coat Accelerator are both solvent free products and are suitable for use in all project workHow-to video with step-by-step instruction on how to apply liquid damp proofing, priming and then self leveling. . 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). 5m) It will have 50mm insulation boards on top of it, followed by 18mm/22mm. 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. Request a callback. Visqueen 2000 gauge Polythene - 12. Alan Jackson - Commercial Manager UK and Ireland - Gypsol. The DPM should: have sealed laps of at least 300mm wide link with wall DPCs to form an impervious barrier to. I really need to get the living room useable for my family and am hoping that a dpm under the engineered wood is possible. the DPM and new floor can then go on top of this. This told us tha. weberfloor DPM can be applied on to concrete or cement based screed surfaces with a. This will allow the screed to. I think underfloor heating would work if you layed DPM, insulation (as much as poss) woodchip flooring and don't use a screed. I am putting down a 22mm engineered oak floor so will use an underlay without a dpm. Wet underfloor heating installation cost. Am hoping for UFH in screed (supplied won't do 50mm, only 65mm). Like a lot of houses of that age, the ground floor is bitumen/asphalt over a concrete screed. Screed on top of slab is cracked/crumply/blown so that’s come off and now down to the concrete. 2. For reference, screed is a thin layer of concrete poured over a floor base. 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. Mastic Asphalt – this is the earliest form of liquid DPM and is usually laid on the top of another membrane or a fibreglass surface. royaloakcarpentry Senior Member. so FBall seems the way to go). My DPM was these tiles that were bitumnned/black jacked to the floor. Firstly, there was no need to use a liquid dpm if you used underlay with a built in vapour barrier. LKAB Minerals +44 (0) 7966 651006. Fax: 0800 270 7368. It is good practice to either fit another DPM or tape the insulation joints, when adding a screed on top of inso'. As a rough guide, laying a conventional sand/cement screed costs around £15/m2, increasing by around £5/m2 when delivered ready-mixed. Ultraplan Renovation Screed 3240 is suitable where good resistance to loads is required, also for castor wheel traffic and underfloor and undertile heating systems. Thanks, Gastines3, FreeBear, and gwynlas! Well, I called a damp proofing guy in, he had a look said if it was him he would put in a screed at least 2 inches high and concrete outside. The difficulty is getting the underneath concrete to have a flat surface at exactly the right level. Many can be used over a variety of existing uneven substrates, using gravity to allow the latex mixture to self-level. dthobhani; 18 Mar 2011; Floors, Stairs and Lofts; Replies 2 Views 1K. Vac up any loose sand once it's set and then tile. A hydronic setup is connected to your central heating system, powered by a boiler or some form of renewable tech (eg a heat pump). Start of next year i will be putting in my finished floor in our new extension, as it stand we got it water tight late last night with the glazing. 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. #Screeding #Sc. Flexible - easy to detail and install on site. 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. Aug 18, 2010. If Under floor heating is used It is essential that the pipes are laid on. I am assuming its asphalt with a bitumen top layer, 10-15mm thick. We have a few options: 1. Thin screed to level old concrete floor. studs 63mm x 38mm at maximum 600mm centres. J. 5-10mm thick. Your builder or yourself should have laid dpm under the dpc course on top of the hardcore Base laid on soft building sand . Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn,. To avoid damage to the insulation layer and the dpm it is necessary to take care in tipping, spreading and compacting wet concrete or screed. LAY DAMP PROOF MEMBRANE. Figure 1: Concrete floor slab and integral footing. The engineer (who is a bit belt and braces) recommended a block and beam floor supported by new foundations so as not to add extra load to the existing 1930s foundations. Be very careful by rushing. 22 August 2019 at 10:27AM. Self levelling compound was laid straight on top of the concrete floor (with no primer). Pumped anhydrite floor screeds are not much dearer than ready-mix sand/cement, costing around £25/m3 (laid to a 50mm depth). Labour costs. 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. 8 Apr 2013. #1. sandwiched under the screed, were also common and usually in liquid form, e.