Looking for a FLAT membrane as I am told the creases you get when you unfold 4m wide DPM / polythene from a 1m roll can cause cracks (plus its a real pain to lay). Some slate or concrete board should then bridge the cavity gap. Vac up any loose sand once it's set and then tile. 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. The insulation should not be stepped as this can act as an anchor point and cause cracking in bridging or on the screed under movement and cause weak spots in a void underneath. The screed has water anyway, so a bit of ingress isnt an issue. floating construction then a second "slip". 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. On the other hand, a dpm on top of the new concrete will push all the moisture towards the walls, so you would have to incorporate the dpm into. Use a thick bed adhesive unless your competent to use screed, it takes skill and practice to create a flat floor. We’d recommend using timber battens to act as a guide – apply a small amount of screed to the flooring to lay the battens on, and lay the battens in strips across the floor. There’s also ridges from where the tiles used to be. 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. Once set, you can then apply your screed flooring to the DPM base. #2. The position would vary in accordance with proposed methods of construction. 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. 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. 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. When incorporating under floor heating: Screeds should be isolated at all edges, abutments and columns to allow for movement due to thermal loadings; The manufacturers’ guidance for both the floor screed and the tiling must be followed to determine the minimum thickness of edge strip required to allow for expansion. Can you put DPM over screed? Liquid DPM is a system that is used over a base floor. If you are getting up to the 50mm, you would question whether you want to use a smoothing product really just from an economic point of view,. Damp Proof Membranes. 6 March 2017 at 8:04PM edited 6 March 2017 at 8:59PM. Our quarry tiles were pretty much laid on dirt so there were some big variations in height over the whole kitchen. Applying Damp Proof Membranes. LAY DAMP PROOF MEMBRANE. 500g Single Wound Polythene-2. Thin screed to level old concrete floor. TF. Damp Proof Membrane is intended for use within solid concrete floors to prevent the rise of moisture or damp through structure flooring. or email. DPM’s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. He also saw hairline cracks in the top layer of screed in places. 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. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. Alan Jackson - Commercial Manager UK and Ireland - Gypsol. 2. the DPM and new floor can then go on top of this. . 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. 21. ; Stiffness: Concrete floors generally possesses adequate prudery & does not parry under the applied load which result in generating problems in non-structural elements, e. If in the screed then no problem with this. Damp Proof Membranes. celotex goes UNDER concrete. Ball and Co. #1. 3. Country. This can only normally be guaranteed if its an new build or extension and most houses have been sold, inherited etc. Made from recycled materials. Damp proof membranes (DPM) A DPM should be a minimum thickness of 1200g polythene and linked to the DPC with a minimum 100mm overlap. Preparation is key with these coatings and the substrate must be sufficiently clean and dry. In both cases the surface on which the dpm is laid needs to be as smooth as possible. A standard sand/cement screed would need to be laid at a minimum depth of 65mm for a domestic property. 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. Hull. com Do I need a DPM under laminate flooring? Simply put yes. 30811761. 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. For rafts, DPM and screed must be on top of raft and screed must be at least 65 mm thick. We've just had our garage converted and our builders have laid a screed floor. Easy Handling & Installation. I was then able to put in a dpm and a hefty layer of cellotex and then screed to the level of the house. com. 4. #1. 1314. 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). The excellent adhesive qualities and quick drying time of Drybase Liquid-Applied DPM make it extremely versatile. British Standard (8204:1) says minimum 65mm for domestic floating. 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. Seems fine so far. BONDED VERSUS UNBONDED SCREEDS Bonded topping screed installations are the most common as this allows the minimum thickness (15mm) to be applied thus limiting the weight load on the structure. What is DPM under screed? Damp-proof membrane (often called DPM) is used in construction to prevent moisture from entering the building, usually through capillary action. Renovation property: £135 to £185 per square metre. top of my concrete slab was about 50mm below DPC, I finished with battens and floorboards. 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). 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. 100 hardcore, 50mm builder's sand to blind, 1200 gauge DPM, 70mm insulation (Celotex, Kingspan, etc. If the property is 200 years old it won't have a DPM under the concrete slab so its sitting direct on. I will post up a pic of the failed LVT in a minute for you! Screed seems to be getting damper. #1. 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. #2. Description. But too much water will extend the drying time and. 67. View complete answer on allthingsflooring. Complies with BS 8485:2015 + A1:2019 - industry standard for methane and carbon dioxide protection. The ground floor is wooden floor boards and there are 2 rooms I need to do. A full sheet DPM is 250 microns (1000 gauge) thickness or above. If the insulation is flat and supported by the slab, 50mm screed won't crack or - spend the DPM money on a roll of 25mm chicken wire. "Your insurance company should be able to instruct property drying. At the time of building the extension, due to new footings for structural walls to hold steels, drainage installed and the existing floor within the house showing signs of damp where the bitumen DPM had failed under floorboards nailed to the screed, I took the decision to remove all the floors, and oversited the whole house. Yes. Prime and reapply , then screed to level and tile. 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. Pricing. 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. 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. Brian shows how to correctly fit a Damp Proof Membrain - DPM in a new build houseLink to the T-Rex tape Website Http://bodgeitwithbri. Therfore putting foil faced boards under screed is a waste of time and is the principle reason kingspan make tissue faced boards. Applying Damp Proof Membranes. Cement screed. Roger Kenworthy on 2021-08-13 17:59:40: Question:Durability: A befittingly developed floor screed will outlast the else modules of the building. If the DPM is still wet you should have not tiled over. 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. Hi, I have an area of approx 6m by 3m on a ground floor extension which is block and beam construction, that I now need to insulate and screed to finished floor height. I intend to lay 75mm PIR. Warm water underfloor heating. Currently, the central heating pipes and mains water pipes are all buried below the damp proof membrane, under the screed. Fig. . As a rough guide, laying a conventional sand/cement screed costs around £15/m2, increasing by around £5/m2 when delivered ready-mixed. Property is mid 1960s, solid ground floor. Temporary protectionI had part of a 9" wall knocked down for a doorway. 28 Sandiwch damp-proof membrane. Brian shows how to correctly fit a Damp Proof Membrain - DPM in a new build houseLink to the T-Rex tape Website Http://bodgeitwithbri. Reinforcing concrete. With the number of planning applications for basement extensions rising by 183% according to research by Halifax, tilers need to be. Energy Efficiency: Concrete floors generally possesses lofty thermal mass & this may be. 1. Then prime the marked out area. Needs a dpm under it and i normally put one on top too - stops you accidentally sticking the boards to the insulation. My query is regarding the floor insulation, damp proofing and screed. UFH Pipwork. 5m) It will have 50mm insulation boards on top of it, followed by 18mm/22mm. Plastic DPM under slab everytime. 6. Let’s hope you have a good water table as that’s the wrong dpm used. 24 h After curing of screedSANS 10400, Part J Floors (which is the SABS “deemed to satisfy” regs) states: “Ventilation of the subfloor space in suspended ground floors shall be provided by means of openings spaced not more than 2,4. You now have a 'swimming. Robust - resistant to on site damage. Yes run the dpm up the wall to connect wall dpc with floor dpm. Based on a screed done in 1963 I’d say 95% there won’t be a effective damp proof membrane under it so a. So I have a concrete floor in the kitchen (concrete - DPM - 50mm screed), knocked through into the outside toilet which just had soil floor. What the DPM is attached to can fail. 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. For this, a metal mesh standing with plastic pillars ( (feet) will be laid before the concrete is. The liquid membrane forms a strong seal and makes a permeable layer to enable moisture to evaporate off. framing joints secured with not less than 2 nails per joint. The work falls under building regs part L and you need minimum 70mm PIR insulation. An ARDEX Damp Proof Membrane will protect the floorcovering. I could put the dpm under the concrete which would be as effective. if your DPM were above the concrete, the uFH would be heating a large damp lump of concrete. -markie-, Feb 10, 2020. There will be a damp-proof membrane under the insulation and possibly a second membrane on top, depending on the type of screed. I intend to consult BC but would like to educate myself before I speak with them Thanks in advance. Deleted member 25896, Feb 2, 2021 #5. If you don't allow the screed to dry properly, the moisture will be trapped within the screed potentially causing failure. It originally had Marley tiles stuck down with bitumen 'glue', but many of them are missing and I will remove the rest. 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. 55mm of TS15 will impart around 1. Any existing floor screeds, coatings or adhesive residues. Visqueen EcoMembrane DPM. then ducting should be provided to allow air through the solid floor and into the void under the existing house. Suitable for most construction damp proofing requirements. When this is down I will then lay more sand or light concrete mix up to the level of the old screed or just below, then let this dry and then apply about 3 coats of bitumin floor paint. This DPM is a ‘thick’ plastic sheet mostly 1000 – 1200 gauge polythene material. They can therefore be laid under the DPM (the DPM is still necessary to prevent. The optimum thickness of a sand. It is much easier to work on sections of the floor than try to achieve an even finish across the whole floor in one go. Assuming for now that the DPM is below the screed (not yet found that out), I'll need to penetrate the DPM and cut into concrete for the waste pipe. Normally you would put a compacted bed of about 50mm sand under the DPM. Also there is no DPM under the slab. Apply ARDEX DPM 1 C to protect the floorcovering installation from residual construction moisture and ground bearing moisture. The advice of a structural engineer should be sought for any exceptional point loads in the design of the floor. We provide a range of solutions including DPM screed, flooring primers and more! We are also radon barrier suppliers, making us perfect for all your needs! Call: 0330 223 2364 ; Email: estimating@cscscreeding. 34. The best example of insulated floor thickness is 100mm (insulation) + 60mm (screed) + 20mm (floor tiles+adhesive). However I'm pretty sure there is no damp proof membrane (or course?) as our water source, a large well, is under the floor and a couple of years ago it flooded into the dining room. studs 63mm x 38mm at maximum 600mm centres. (DPM) with joints well lapped and folded. the cut. g. The water got under the DPM and wet the slab and blinding layer. The idea is that you are to prevent any screed material from falling down any joints and coming into contact with the cold slab. 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. DPM’s must be carefully protected where folded up the perimeter walls, and lapped under the DPC particularly at door openings. As a rough guide, laying conventional screed costs around £15/m2, increasing by around £5/m2 when delivered ready-mixed. It will - I believe - deteriorate with UV light, but that won't apply to anything cover by the soil itself. . New-build install: £50 to £75 per square metre. For technical support please call. • Unbonded (i. 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. DPM's must be carefully protected where folded up the perimeter walls, and lapped under the DPC particularly at door openings. In addition to the damp proof membrane (normally a 1200-gauge polythene sheet below the insulation), a 500-gauge polythene VCL. Brian McNaughton & Son Ltd. 65mm Screed. The old adhesive should of been removed. hot bitumen, or cold bitumen in solution. 9. Kingspan GreenGuard is available in a range of compressive strengths starting at 300 kPa 10% compression. Pumped Anhydrite Screeds. with the concrete but the insulation. 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. rev 2023. UFH inside plastic polypanels 75mm screed (probably not liquid). We are in the process of having an extension built. #2. The DPM is tied into the internal leaf of masonry. The main drawback. As with the Kooltherm installation, start by ensuring a clean and level surface. There is a small section along the chimney where. As a waterproofer, BAL DPM is an easy two-coat system when used with BAL Self-Adhesives Butyl Tape in corners and junctions. Use polyethylene sheeting to create a waterproof membrane to ensure that there is no leakage of the screed when it is pumped in wet. Screed. The concrete slab was usually 100 to 125mm thick. The advantages are the relatively low price of about £12 per square metre in combination with also relatively low installation costs of £8 – £12 per sqm as well as the high load- bearing capacity of cement screed. This essentially means that the screed has been laid in direct contact against the bottom of the aluminium door frame. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. 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. 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. This generally takes 1-2 days, depending on the thickness of the floor screed. TB243. The flooring that’s going down is polyflor safety flooring it’s. If under the screed this is normally a polythene dpm so the screed is then an. Should I lap DPM under or over Dpc then celotex, then another DPM lapped up the wall with 25mm up stands. Doggit. But if you’re on a tight schedule, allow at least 7 days before applying your vinyl floor covering. "Turn off electricity and gas only if it’s safe to do so," he said. 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. The surface should be of sufficient quality and. If modified screed is used you can get down to 55mm. 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. No this is designed to be used under floor screeds, tiles, render or plaster. Hi, I’m after some advice/suggestions regarding my floor…We’ve recently moved into a 60s house which has a screed floor, on top of a concrete base with no DPM. The surface should be of sufficient quality and. g. Sunny Hampshire. 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. The 40mm between the joists is about 0. The minimum sand and cement screed thickness would be 40mm as defined by the British standard. What do think? What if we're pouring one of these strong self. Reinforcement is required when you’re concreting areas that will be subjected to heavy loads, such as garages and car parks. Discussion in ' Builders' Talk ' started by barnjules, Jan 30, 2017 . . I see some under the wood bearers, so hopefully this will keep the base dry. 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. Hello, I have noticed some funny things going on under the floor of our recently bought house, which was originally built in 1905. apparently some of the screeds had a cold or hot bitumen in or under them. It's a complete lack of knowledge on your floorlayers part or possibly just a carpet fitter trying his luck. 3. The mat seperates the UFH and the (normally) floor tiles, and allows them to expand at different rates, so stops the tiles cracking. It needs: 100mm or more of well compacted type 1 MOT, sufficient sand to blind, DPM, insulation, screed. 250mu (1000G) Black Polythene Damp Proof Membrane (DPM) 4m x 25m (100m2/Roll) URN: 5004075. Eventually I will rip out the old floor and replace it but I would like to understand (as much as possible) what is going on under it without taking it off. Fast drying screed cost. Damp proof membranes (DPMs) can be used to help resolve damp issues which already exist or to avoid damp or moisture problems in. The dpm has added to the problem by removing any bonding capabilities within the floor screed. Don't think it will make much difference tbh, if you go the timber route use 22mm plywood instead of chipboard though. Uses/Subfloors:If you have under floor heating, you can use it to dry the screed 7 days after installation and the additional depth, (up to 65mm), becomes less important, But you’re still wasting money on screed you don’t need. Our expert team are ready to offer you the very best solution for waterproofing. g. Other benefits. not a good idea man. However, when I hammer-fix the battens to the concrete I'm going to punch holes in my DPM. Walkable in 6 hours. PermaSEAL Liquid DPM can also be applied to concrete floors below screeds. With the number of planning applications for basement extensions rising by 183% according to research by Halifax, tilers need to be aware. Your builder or yourself should have laid dpm under the dpc course on top of the hardcore Base laid on soft building sand . Find. #1 CGN Screwfix Select andyscotland said: ↑ The concrete slab I poured for my utility room extension is slightly uneven - a small dip into the centre. "Document any damage for insurance purposes. 8). 5kg multi chamber bags. 1200g dpm. Water is added to ensure a thorough mix and to aid workability. What should normally happen is the inner course should be removed to concrete slab level. This was due to a neighbour redirecting the water from his gutters. This will. Use screed on top of a concrete base to give your floor a level and smooth finish. But others are direct to earth, brick, rubble what ever. 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. DPM Membranes for Concrete Floors A range of high quality DPM membranes from Capital Valley Plastics, designed for use with solid concrete slabs. Still struggling with how to retrofit the DPM (on rough old solid concrete floor) and insulation etc Am not going to manage brilliant insulation as I failed to realise we couldn't take the DPM above the DPC ( at 150mm), even tho there is the head height. 0113 2455450 sales@rawlinspaints. 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. 50mm C&S (1:4) screed towelled smooth. You also mentioned that there are vinyl tiles over the floor. All tiles and sand cement screed removed and last remaining suspect area. com. Screeds are covered by BS 8204, Screeds, bases and in-situ floorings, (2004). I was with Mapei last week inspecting a failed DPM that had been laid on a subfloor with no DPM under it. 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. A laminate wll be glued onto that. This will allow the screed to. 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. 4 Apr 2017. com. Ideal for use where there is no functioning structural DPM (common in older properties). Sealing a patch of DPM around its edge to the old is easy, just use silicone goo. You will need to tear the lot up. It is advisable to incorporate a light mesh within the raft for reinforcement. 100mm thick (can be heated) - Levelling screed (as required: self levelling compound, sand/cement screed etc) - Flooring, e. 2m3). #1. Many can be used over a variety of existing uneven substrates, using gravity to allow the latex mixture to self-level. 17 May 2010. When stripping the bathroom, the area under the bath tub was bare concrete, lower than the rest of the "black" floor throughout the property. xednim, Apr 6, 2019. Learn More Damp Proofing 15 Items DPM Handy Pack - 300mu 1200 gauge - 4m x 5m Rating: 2 £17. The DPM should: have sealed laps of at least 300mm wide link with wall DPCs to form an impervious barrier to. Coverage: Approx 6 m at 3 mm thickness. The vinyl that was laid bubbled up, so contractor removed it. This barrier is intended to stop moisture passing from one to the other. • GG300 – 300kPa. 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). DPM over a new underfloor heated screed, the heating system must be turned off 48 hours before application. 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. is that do-able? if so, can I just run the DPM 1 course above DPC? it's too late to tuck. They can therefore be laid under the DPM (the DPM is still necessary to prevent. 034 W/mK, and is used to insulate inverted roofs, basements, car park decks, and heavy-duty commercial, industrial and cold store flooring. There is a concrete slab in place with a DPM underneath. The position would vary in. For bonded screeds,4 weeks will depend on the depth - keep the screed as thin as possible - with wet UFH normally 50mm - any more will delay the drying time. 3. It’s only to stop the screed running under the insulation. £18 - £22 per m2. heating installations with cementious screeds provided a temperature of 27°C is not exceeded. 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. ) chrysotile (white) asbestos fibres. There are two main options: 1. CSC screeding was very efficient that they screeded our floor in under 4 hours (around 91sqm) with the help of the Mixamate. This should be laid on a bedding material such as screed which doesn’t damage the sheet and has fully sealed joints. Ground-bearing concrete floor slabs should be protected against ground moisture by providing a continuous damp proof membrane (DPM). 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. 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. Acknowledgement : The Concrete Society. Visqueen 2000 gauge Polythene - 12. Property is mid 1960s, solid ground floor. Generally fairly high grade stuff too. 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. 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. above the slab I am having a screed to cover the UFH pipes. SikaBond® Rapid DPM is a single part moisture curing polyurethane. A traditional sand and cement screed is normally a 1:4 or a 1:3. 25W/m 2 K to meet with building regulations, even if you didn’t plan to. The floor is concrete slab, 100mm Kingspan PIR, DPM and then 70mm screed. I'm not saying this is the best thing to use. 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. Small domestic areas that are going to have carpet, wood or synthetic floors as the final surface are ideal to use in conjunction with. Alan Jackson - Commercial Manager UK and Ireland - Gypsol. When sand-blinded, BAL DPM allows tiling onto difficult substrates such as steel. 2) 25mm - Celotex TB3000 Insulation Board. DPMs on top of the slab, i. Country. Mapeproof One Coat is not recommended for heated subfloors where wood floor coverings are to be installed. 00. Flexible - easy to detail and install on site.