Roger Kenworthy on 2021-08-13 17:59:40: Question:Durability: A befittingly developed floor screed will outlast the else modules of the building. sandwiched under the screed, were also common and usually in liquid form, e. 25W/m 2 K to meet with building regulations, even if you didn’t plan to. 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. 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. RFC Liquid Damp Proof Membrane (DPM) is a professional 2-component applied surface primer. #5. The subfloor. Yes it is a small breach on regs but would be up to building control to decide. Screed above dpm. 17 May 2010. I 've dug down and put 100mm of concrete down will liquid dpm to meet up with the existing dpm and 50mm screed ontop easy. Tramex reading at the time of vinyl removal was 3-4+. 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. – the UK’s leading manufacturer of flooring adhesives and floor preparation products for the contract flooring industry. The subfloor in my house is a concrete slab with no DPM. heated levelling screeds. He has sealed the joints as well so hopefully they won't squeak. • To provide a wearing surface. #1. 25 Apr 2010. Mark El-Kadhi New Member. If you are just trying to take a hollow out get a long straight edge and use a marker pen to mark out the perimeter of the hollow. The 40mm between the joists is about 0. Damp Proof Membranes. Hi guys. 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. As a rough guide, laying a conventional sand/cement screed costs around £15/m2, increasing by around £5/m2 when delivered ready-mixed. The surface should be of sufficient quality and. screed thickness. If Under floor heating is used It is essential that the pipes are laid on. 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). This self leveling concrete’s use of latex. It needs: 100mm or more of well compacted type 1 MOT, sufficient sand to blind, DPM, insulation, screed. It is essential that this. 0. It stops around 10mm away from the internal walls in all rooms. 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. 75mm pir but we have decided on 100. 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. They can therefore be laid under the DPM (the DPM is still necessary to prevent. A full sheet DPM is 250 microns (1000 gauge) thickness or above. Visqueen High Performance Damp Proof Membrane. 55mm of TS15 will impart around 1. someone suggested removing the blocks on the inside along the width of the bifold and screeding all the way to the brick course. ARDEX DPM 1 C may be used if; 1. Damp proof membranes (DPMs) can be used to help resolve damp issues which already exist or to avoid damp or moisture problems in. 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. 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. #7. 16) Concrete slab 300mm. 20m2, 50mm = 0. 14) Screed. Mapeproof One Coat is not recommended for heated subfloors where wood floor coverings are to be installed. . It is important to ensure that a proper seal is achieved around all services. The optimum thickness of a sand. 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. It's a complete lack of knowledge on your floorlayers part or possibly just a carpet fitter trying his luck. either way, as the other posts say, you would be better screeding which will also take out any irregularities in the concrete. JB Flooring Well-Known Member. For rafts, DPM and screed must be on top of raft and screed must be at least 65 mm thick. The advice of a structural engineer should be sought for any exceptional point loads in the design of the floor. I was planning on putting 1200g DPM down, then 80mm celotex insulation (taped at joints), then 65mm screed (approx 1. Assuming that the damp proof membrane (dpm) under the concrete has failed in areas then yes you possibly would get the odd patch of dampness showing in the floor. 1. hallbeck New Member. 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. Sunny Hampshire. Pumped anhydrite floor screeds are not much dearer than ready-mix sand/cement, costing around £25/m3 (laid to a 50mm depth). Concrete & Sand/Cement Screeds Concrete and sand/cement screeds must be dry and any laitance or surface treatments removed. is that do-able? if so, can I just run the DPM 1 course above DPC? it's too late to tuck. 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. A floor screed is usually a cementitious material made from a 1:3 or 1:4. hot bitumen, or cold bitumen in solution. I am assuming its asphalt with a bitumen top layer, 10-15mm thick. Using this latex based damp proof paint as a damp p. Remove and Smooth. The position would vary in. Damp proof membranes (DPM) A DPM should be a minimum thickness of 1200g polythene and linked to the DPC with a minimum 100mm overlap. Currently, the central heating pipes and mains water pipes are all buried below the damp proof membrane, under the screed. 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. Just lap the whole room up as normal, blobs of. Contact Us. You'll also need to take the dpm up the walls as well. Doggit. 50 Ex VAT £21. 14 m-1 P/A and use of edging insulation. Our Liquid DPM can be used on walls under a render to create a flexible waterproof layer. Country. Renovation property: £60 to £85 per square metre. The tiler can then latex or screed over the DPM. I will be tiling over the screed so looking for the simplest option. Then a primer like the one you have at 4-1 then if needed another coat at 2-1. "Turn off electricity and gas only if it’s safe to do so," he said. I intend to consult BC but would like to educate myself before I speak with them Thanks in advance. 14 assuming 0. Since that period I've take out the bitumen screed/dpm and been on the concrete slab since about mid February/March. This barrier is intended to stop moisture passing from one to the other. DPM's must be carefully protected where folded up the perimeter walls, and lapped under the DPC particularly at door openings. Aug 18, 2010. 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. Price: £4. 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. In both cases the surface on which the dpm is laid needs to be as smooth as possible. 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. Bostik Screedmaster Rapid DPM is a ready for use; one part, water-based damp proof membrane. 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. blocking/nogging for support of plasterboard 43mm x 38mm. This site contains a wealth of information on our extensive product range, along with a selection of videos demonstrating their application. . I have flowed screed planned for the finish rather than sand/cement. DPC and DPM are lapped together at this stage. Right based on those joist spacings and dimensions the joists should easily accept 1. Deleted member 25896, Feb 2, 2021 #5. The correct installation of polythene DPM, rigid insulation and separating layers are highly important to the. Care must be taken to a) ensure there are no holes or tears in the sheet that could allow. Plastic DPM under slab everytime. Curing Under Polythene 12 hrs 12 hrs Drying Time To Receive Finishes - from removal of curing polythene sheet 50mm thickness and 50% RH. 15) DPM under screed. . 0. I'm looking for opinions on the best self leveling screed to use on my slightly wonky concrete garage floor. The tiler can then latex or screed over the DPM. This seems to have been used in abundance before the original screed was put down. The Epoxy DPM 5kg is supplied in two 2. 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. Notch7. 100mm **concrete base*. It has had an extension about 50 years ago and that is the problem room as the flooring was laid without any DPM under the existing concrete floor, so there are some rising damp issues (I think). The only way to tell properly, is to carry out a proper test. uk ;. floating construction then a second "slip". Pro-Screed Gold is suitable for application over most underfloor heating systems. ; Stiffness: Concrete floors generally possesses adequate prudery & does not parry under the applied load which result in generating problems in non-structural elements, e. 5kg multi chamber bags. Instead of a membrane, use a foam underlayment material which will keep the wood from touching the screed directly (avoiding any moisture transfer) but which will also allow the screed to breathe and thus dry over time. I think underfloor heating would work if you layed DPM, insulation (as much as poss) woodchip flooring and don't use a screed. 20)Reinforced concrete floor. 6 March 2017 at 8:04PM edited 6 March 2017 at 8:59PM. However, when I hammer-fix the battens to the concrete I'm going to punch holes in my DPM. (DPM) with joints well lapped and folded. Country. 5sqm has blown. If the property is 200 years old it won't have a DPM under the concrete slab so its sitting direct on. 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 or laminate. As you would expect, you need as much heat as possible to flow upwards and into the room. Insulation will then go on top and the screed layer would go over the whole lot. The guy doing it tried to compensate by using more adhesive and most of the wood has. 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. Posted July 28, 2021. AN INTRODUCTION TO. We could scrape up the tiles and start again. 10) Timber block between U channel and Cavity Weep Holes 11) Galzing unit (window/glass) 12) Tiles glued 13) Polypropylene 14) Screed 15) DPM under screed 16) Concrete slab 300mm 17) DPM under. Brian McNaughton & Son Ltd. Request a callback. The clips only pierce the thinner layer above the insulation, which is only really there to ensure an unbonded concrete/screed above. I was with Mapei last week inspecting a failed DPM that had been laid on a subfloor with no DPM under it. So I have a concrete floor in the kitchen (concrete - DPM - 50mm screed), knocked through into the outside toilet which just had soil floor. This barrier is intended to stop moisture passing from one to the other. 1. 13) Polypropylene. 100mm thick (can be heated) - Levelling screed (as required: self levelling compound, sand/cement screed etc) - Flooring, e. #1. 99 Inc Vat. Cushion Ultra Silver Wood 10m² Underlay: The best laminate underlay for damp protection. All other sheet membranes can be used with unbonded toppings. Pumped anhydrite floor screeds are not much dearer than ready-mix sand/cement, costing around £25/m3 (laid. Vac up any loose sand once it's set and then tile. It is not. The DPM should extend up the external foundation walls to meet. ARDEX DPM 1 C may be used if; 1. Gaz, you need to change your message setting as I can't reply. Mastic Asphalt – this is the earliest form of liquid DPM and is usually laid on the top of another membrane or a fibreglass surface. There will be a damp-proof membrane under the insulation and possibly a second membrane on top, depending on the type of screed. An ARDEX Damp Proof Membrane will protect the floorcovering. Express Liquid Screeds Limited. Issues to be taken into account include: installation. 49 per m2. FlexiDry said: Yes laying the screed direct onto insulation is standard practise for a floating floor. Jabfloor 70 has a nominal 1% compression value of 21kPa (2. To avoid such issues, it is therefore extremely important to make sure that the screeds are given sufficient time for drying. VAT £ 0. Floor under carpet marked with chalk for wet areas. These can over time allow a build up. DPM's must be carefully protected where folded up the perimeter walls, and lapped under the DPC particularly at door openings. 250mu (1000G) Black Polythene Damp Proof Membrane (DPM) 4m x 25m (100m2/Roll) URN: 5004075. It is a thermally effective solution that is equally efficient in concrete floors, beam and block floors, and suspended timber floors. TiT. It stops around 10mm away from the internal walls in all rooms. Material. USES For priming, consolidating and sealing of: Absorbent and non-absorbent sub-floors, consolidat-ing weak cement screed and isolation of old adhesive residues. Replacing over half of your floor will mean you’ll have to insulate to at least 0. Temporary protection should be given As proven in this Celotex Floor Insulation Guide, Celotex insulation is a versatile and effective flooring insulant. screed finish over the insulation to match existing floor levels. rogerk101 likes this. 19 Mar 2011. 5m x 100m, 2m x 100m, and 2m x 50m. 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. All waxes or sealers must be removed, and patching/leveling or embossing must be brought to a flatness of 3/16” in 10’. For unbonded and floating screeds, a DPM may be specified between the base slab and the screed. 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. . Epoxy DPM itself (the actual product epoxy) wont fail once set. Flowable liquid floor screed suitable for applying up to a depth of. Ie work down from FFL. This allows for the full 5kg or just half to be mixed at once depending on the area to be covered. As with the Kooltherm installation, start by ensuring a clean and level surface. The Epoxy DPM 5kg is supplied in two 2. Capital Valley Plastics Ltd Damp-Proof Membrane Black 1200ga 25m x 4m (47163) (55) compare. Ok so I have drawn the attached image. Then prime the marked out area. apparently some of the screeds had a cold or hot bitumen in or under them. It still might not have a DPM under the floor. if your DPM were above the concrete, the uFH would be heating a large damp lump of concrete. 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. Brian shows how to correctly fit a Damp Proof Membrain - DPM in a new build houseLink to the T-Rex tape Website Http://bodgeitwithbri. Resin and cementitious floor finishes combining performance and design. 250mu Polythene DPM is suitable for use as a damp proof membrane under screed floors. Let’s hope you have a good water table as that’s the wrong dpm used. Flexible - easy to detail and install on site. 5mm = 2. 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. £14 per m2. We are one of the leading manufacturers of advanced barrier technologies and design-based solutions for specifiers, contractors and builders merchants throughout the UK and Europe, you can count on Visqueen for product quality. Spoke to makers of UFH system. e. What should normally happen is the inner course should be removed to concrete slab level. The floor make up is compaced hard core, 125mm concrete, dpm, 100mm insulation, 75mm concrete screed ( polished and heated). First, divide the floor up. com. Jan 24, 2019. The bitumen is about 20 mm thick and, I believe, serves as moisture barrier as well as an 'appearance' finish. Greater thickness of screed may lead to a colder floor. Find. 5kg multi chamber bags. Nice. 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. Then a DPM on top to avoid them floating in the screed. Cement screed. Many can be used over a variety of existing uneven substrates, using gravity to allow the latex mixture to self-level. 21. pf flooring, Jul 28, 2015 #20. you then have a continuous damp couse not inportant if concrete above dpc level. 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. You will need to tear the lot up. 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. 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. Alan Jackson - Commercial Manager UK and Ireland - Gypsol. The screed will be only ~50 max (not yet dug any up). Wet underfloor heating. 34. 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”. #1. This can include timber floors, tiles, laminate flooring and carpet. Drybase Liquid-Applied DPM should be used in situations where the final surface is going to be covered. 3. My questions are: Is there any reason to use a roll of DPM vs a liquid. My work will be (in order of layers): 1) DPM 1000 gauge with joints taped with Polythene joint tape. 300 dries very hard Bitumen is soft so not compatible. ORDER LINE 0800 047 6775. 00. The purpose of DPM. Liquid DPMs gave the best protection but were more expensive. Country. The current pipes to it will be diverted to another drain to the left of the photo. You adjust the concrete slab to let your. Perfect for new builds and refurbishment projects, our range of floor insulation products include optimum peformance OPTIM-R Vacuum Insulation Panels (VIPs) with an insulating performance up to five times better than commonly used insulation materials, and. 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. My DPM was these tiles that were bitumnned/black jacked to the floor. We've just had our garage converted and our builders have laid a screed floor. It has to breath to survive. Answered 18th Aug 2020. 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. phatboy. That seems to be the recommended practice but I'm not sure how many bother with the one on top. For unbonded and floating screeds, a DPM may be specified between the base slab and the screed. 2. bandejapaisa; 30 Jun 2023; Building; Replies 5 Views 1K. Insulation Below A Floor Screed. I think this is too expensive, so got a quote of another supplier of £2565 plus any potential floor preparation, with latex screen costing £13 /sqm or a feather finish at £2. Polycote DPM Primer is a superb twin pack high-performance epoxy coating that. The screed layer is damaged by damp, and is easily disturbed/crumbled. It may be applied onto either a solid in-situ concrete ground floor slab or onto a precast concrete floor unit. 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. We have our own in-house delivery fleet of FORS Gold vehicles with Moffett mechanical off-loads delivering nationwide. Easy Handling & Installation. You are therefore at the edge of the joists capability. 4) at a thickness of 3" inches The guidelines state that a damp proof membrane that is placed under the flooring should be around 1200 gauge and constructed of polyethene. concrete slab. Hello, I have noticed some funny things going on under the floor of our recently bought house, which was originally built in 1905. • GG500 – 500kPa. 5kN/m2. The work falls under building regs part L and you need minimum 70mm PIR insulation. There’s also ridges from where the tiles used to be. Should I lap DPM under or over Dpc then celotex, then another DPM lapped up the wall with 25mm up stands. 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. It is good practice to either fit another DPM or tape the insulation joints, when adding a screed on top of inso'. 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. The DPM should come up in an upstand and tie into the DPC on the. Our costs are ballpark averages – get a local tradesperson to quote now. In addition to the damp proof membrane (normally a 1200-gauge polythene sheet below the insulation), a 500-gauge polythene VCL. 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. DPM’s can be applied to either a suitable blinding layer under the slab or internally to the top of the slab. J. ), then 500 gauge plastic (or just use the leftover 1200 gauge DPM) then 100mm concrete slab. Seems fine so far. However the tiler should apply a Primer before screeding such as StopGap P141. 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. 4,049. Temporary protection should. These black DPMs can also be used with underfloor heating - under normal operating conditions this will not adversely affect the membrane. 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. Firstly, there was no need to use a liquid dpm if you used underlay with a built in vapour barrier. Prime and reapply , then screed to level and tile. 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. Where screed is laid on top of insulation, screed should have a minimum depth of 65mm. 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. If in the screed then no problem with this. Insulation is laid on the concrete and covered with a screed. 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. 2 Feb 2010. 5sqm has blown. . #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. 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. #1. Ultraplan Renovation Screed 3240 is suitable where good resistance to loads is required, also for castor wheel traffic and underfloor and undertile heating systems. Two coats will provide protection up to a maximum hygrometer reading of 95% RH. For traditional screed, the usual total will fall within the range £18. the cut. . 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. 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. 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. m10 cement based levelling and wearing screeds 160 m12 resin flooring 163 m13 calcium sulfate based screeds 165 m20a plastered coatings 166 m20b rendered and roughcast coatings 169 m21 insulation with rendered finish 172 m40 stone, quarry and ceramic tiling or mosaic 173 m42 wood block composition block and mosaic parquet flooring 1763. Mot1 Sand/hardcore sub base. - Polythene membrane (DPM) - Insulation (rigid board type) - Concrete slab min. If the applied DPM is still very tacky, this1. The current recommendations for an effective damp proof membrane are that the ground should be constructed using screed with the damp proof membrane laid either on top or below that layer. Checkatrade offers the following guide: Electric underfloor heating cost. do I still need a DPM under that insulation? it is internal and sitting on a structural slab that is wrapped in DPM externally. But what I dont understand is what to do to. 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. 4 Apr 2017. 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. Customer asked me how did they stop rising damp before the Dpm sheet was used and it made me think ( that hurt ) . The asphalt screed provides a membrane to the surface of the concrete floor preventing moisture within the constructional slab causing decay to the floor coverings. This barrier is intended to stop moisture passing from one to the other. It is advisable to incorporate a light mesh within the raft for reinforcement. The 'vapour barrier' attached to your underlay will only protect your floor from a slab reading 75% RH or less. The DPM should: have sealed laps of at least 300mm wide. The ground floor is wooden floor boards and there are 2 rooms I need to do. 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. I am the Managing Director of the Multi-Award Winning Speed Screed. 17 May 2010. But others are direct to earth, brick, rubble what ever. Hi, Thanks for this, so it sounds like you would normally just overlap (and seal) the floor DPM and one over the threshold which extends to the outer leaf? I've filled the cavity with concrete under the door opening and poured the slab and the screed will go across the cavity to the outside leaf (which has the perimeter insulation to stop cold spots). Was looking to do liquid DPM sandwich with fball 1200/F77/1200 (or NA/1cDPM/NA but that’s costing another 30% more. All tiles and sand cement screed removed and last remaining suspect area. If you're laying Karndean over existing flooring, be sure it is properly prepared. Complies with BS 8485:2015 + A1:2019 - industry standard for methane and carbon dioxide protection.