--- title: "Floor Line & Wall Joint Mastic in Chatham, Kent | SP Silicone Sealants" description: "Floor-line and wall-junction mastic in Chatham and across Kent. Consistent, hygienic, straight mastic lines for corridors, plant rooms and commercial floor plates. 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Consistent, hygienic, straight mastic lines for corridors, plant rooms and commercial floor plates. Free quotes.", "serviceType": "Floor line & wall joint mastic", "provider": { "@type": "LocalBusiness", "name": "SP Silicone Sealants Limited", "telephone": "+44 7342 520584", "email": "spsilicone@mail.com", "address": { "@type": "PostalAddress", "streetAddress": "The Historic Dockyard", "addressLocality": "Chatham", "addressRegion": "Kent", "postalCode": "ME4 4QX", "addressCountry": "GB" } }, "areaServed": [ "Chatham", "Kent", "London", "South East England" ] }, { "@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [ { "@type": "Question", "name": "How is floor-line mastic priced?", "acceptedAnswer": { "@type": "Answer", "text": "By measured run, quoted free in writing after a take-off from your drawings and a site walk. Bead width, product and profile are agreed as part of the quote so the standard is set before we start." } }, { "@type": "Question", "name": "How much can you get done in a day?", "acceptedAnswer": { "@type": "Answer", "text": "It depends on preparation and access, but high-volume mastic is our daily work — we plan visits so a floor plate is completed as a unit rather than left part-finished across weeks." } }, { "@type": "Question", "name": "When in the programme should we book you?", "acceptedAnswer": { "@type": "Answer", "text": "After flooring is laid and adhesives have cured, and normally after decoration unless the specification says the bead is to be painted. Booking us too early means the line gets damaged by the trades following." } }, { "@type": "Question", "name": "Can the mastic be painted?", "acceptedAnswer": { "@type": "Answer", "text": "Only if a paintable product is specified from the outset. Paint will not adhere to cured silicone, so tell us at quote stage if the bead forms part of a painted wall finish." } }, { "@type": "Question", "name": "How long will the mastic line last?", "acceptedAnswer": { "@type": "Answer", "text": "In normal commercial use a correctly applied junction lasts for years and typically outlasts the floor finish. Areas cleaned with abrasive machines or heavy chemicals wear faster. We do not advertise a guarantee; we specify the product for the cleaning regime instead." } }, { "@type": "Question", "name": "Can you match the mastic to the floor or wall colour?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — colour-matched sealant is available so the junction reads with the flooring, skirting or wall finish rather than framing it in white." } }, { "@type": "Question", "name": "Do you cut out existing mastic that has been rejected?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. Remedial runs are a regular request: we cut out the failed or inconsistent bead, prepare the junction and reapply to a set width, then walk it with your site manager." } }, { "@type": "Question", "name": "Can you work in an occupied building?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We phase runs so areas stay usable, work outside core hours where the site requires it, and keep the working zone clean and clearly marked." } }, { "@type": "Question", "name": "What paperwork do you provide for site?", "acceptedAnswer": { "@type": "Answer", "text": "RAMS on request, CITB and CSCS accreditation, and evidence of £2 million public liability insurance — sent before induction so nothing delays the first day." } }, { "@type": "Question", "name": "Which areas do you cover?", "acceptedAnswer": { "@type": "Answer", "text": "Kent, London and the South East from Chatham, including Maidstone, Sevenoaks, Tunbridge Wells, Kings Hill, Meopham, Whitstable, Tenterden, Bexley and the City of London." } } ] } ] --- SP. [07342 520584](tel:+447342520584)[spsilicone@mail.com](mailto:spsilicone@mail.com)Chatham, Kent Mon–Sat, 7am–7pm · Sunday closed [![SP Silicone Sealants logo](/__l5e/assets-v1/04f69d29-f7e4-4833-a846-7060bb9b1458/sp-logo-v5.webp)](/) [Home](/)[About](/about) Services Service Areas [Our Work](/our-work)[Contact](/contact)[07342 520584](tel:+447342520584)[Request Estimate](/contact) Menu ![Neutral-cure silicone mastic applied to a stone tile floor-to-wall joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) [Home](/)/ [Services](/services)/ Floor line & wall joint mastic Floor & wall junction mastic — commercial # Floor Line & Wall Joint Mastic in Chatham straight lines, hundreds of metres The detail the client's eye follows down a corridor. We run floor-line and wall-junction mastic at consistent width and profile across whole floor plates, so the fit-out looks finished and the junction is sealed against water and dirt. [Request a free estimate](/contact)[07342 520584](tel:+447342520584) £2m public liability cover, CITB and CSCS accredited, RAMS on request, and free quotes taken off measured runs. £2m cover public liability insurance CITB & CSCS accredited on site RAMS on request for commercial jobs Free quotes photo quotes on small jobs Chatham based Kent, London & South East 01 The service ## What this work involves — and who it is for ### What floor-line and wall-joint mastic covers This is the sealing of junctions where a floor finish meets a wall, skirting, upstand or column, and where wall linings meet each other or meet a change of material. It is high-volume work — a single office floor or school corridor can carry several hundred metres of it — and it is the finish detail a client walks past at eye level for the life of the building. The work includes sealing to vinyl, safety flooring, resin, screed, tile and carpet edge trims, sealing skirting and upstand lines, sealing behind and beside IPS panels and duct casings, and closing wall junctions where plasterboard meets column casings, blockwork or existing structure. Beads are set out to a single consistent width, gunned in continuous passes and tooled to a clean concave profile. ### Who it is for Main contractors, developers and construction companies delivering office refurbishments, new builds, building refurbishments and schools, where the mastic package is a defined item that has to be complete and consistent for handover. Also fit-out contractors and flooring contractors who want the mastic line done by someone who does nothing else, rather than absorbed into another trade's snagging list at the end of a programme. ### When it is needed At finishes stage, after flooring is laid and adhesives have cured, and after decoration where the specification calls for the mastic to be applied last. Sealing before the floor finish is complete means the bead is cut, lifted or contaminated by the trades that follow. It is also needed remedially — where an existing mastic line has discoloured, split at the wall face, been damaged by cleaning machines, or was applied to such inconsistent widths that it has been rejected at inspection. ### Why professional application matters Nothing exposes inconsistent workmanship like a long straight line. Two hundred metres of mastic applied by whoever was free at the end of the job will wander in width, change profile at every restart, and pick up smears on the wall above it. The same run set out properly reads as a single deliberate detail, and it is the cheapest way to make a fit-out look expensive. There is a functional side too. Floor-to-wall junctions are where mop water, cleaning chemicals and spillage collect. A sealed, tooled junction stops water getting under the flooring and into the wall base, and gives cleaners a wipeable radius instead of an open crevice that traps dirt — which is why it matters in kitchens, washrooms, healthcare and education settings. 02 Recent work ## Floor line & wall joint mastic — completed jobs ![Neutral-cure silicone mastic applied to a stone tile floor joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) [See the full gallery](/our-work) 03 What it costs to leave it ## A failed seal never stays a small problem Mastic is the last line item on the programme and the first thing a client points at. Getting it wrong is not a structural failure — it is a credibility failure, plus a slow water problem at the base of every wall in the building. ### Water under the floor finish An open floor-to-wall junction lets mop and spill water track under vinyl and safety flooring, breaking down adhesive and lifting edges. The repair is flooring replacement, not resealing. ### Dirt traps and hygiene failures Unsealed or badly tooled junctions collect dirt and moisture that cannot be cleaned out. In kitchens, washrooms, healthcare and school settings that becomes an audit and hygiene issue rather than a cosmetic one. ### A snag list that runs the length of the building Wandering bead widths and smeared walls are written up run by run. Correcting them after decoration means masking, cutting out and touching up paint — days of work, at your cost, on the critical path. ### Mistakes we get called out to fix - Applying mastic before flooring adhesive has cured, so the bead is disturbed and the joint contaminated. - Running an unmasked bead against fresh emulsion, then smearing sealant across the wall face while tooling. - Restarting the bead every metre, leaving visible joins, width changes and cold joints along the run. - Using an unsuitable general-purpose product where the specification calls for a hygienic, cleanable or acoustic sealant. - Leaving the bead untooled, so it stands proud of the skirting and is torn off by the first cleaning machine. 04 How a job runs ## The order of work, start to finish ![Neutral-cure silicone mastic applied to a stone tile floor joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) Step 01 — Take-off & site walk 1. 01 ### Take-off & site walk We measure the runs off drawings and confirm on site which junctions are in scope, what the floor and wall finishes are, and where profiles change. ![Neutral-cure silicone mastic applied to a stone tile floor joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) 2. 02 ### Free quote by measured run A fixed written price per metre of run, with the product named and the bead width agreed so there is no argument about consistency later. ![Neutral-cure silicone mastic applied to a stone tile floor joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) 3. 03 ### Preparation & protection Junctions vacuumed and wiped free of dust and adhesive residue, adjacent finishes masked, and any failed existing mastic cut out. ![Neutral-cure silicone mastic applied to a stone tile floor joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) 4. 04 ### Continuous application Beads gunned in long continuous passes to a set width and tooled immediately, keeping profile and shadow line identical along the run. ![Neutral-cure silicone mastic applied to a stone tile floor joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) 5. 05 ### Inspection walk & clean up We walk the runs with your site manager, cut in late additions, remove masking and leave no residue on floor or wall finishes. ![Neutral-cure silicone mastic applied to a stone tile floor joint](/__l5e/assets-v1/a70f1c6d-6266-454c-b553-ad933839b6aa/floor-line-wall-joint-mastic-application-01.jpg) 05 What you get ## The difference a properly detailed finish makes ### One consistent line, floor to floor Set-out width and profile held across the whole plate, so the detail reads the same in every corridor and every room. ### Sealed against mop and spill water A closed, tooled junction keeps water out from under vinyl, safety flooring and resin edges where adhesive failure starts. ### Cleanable and hygienic A concave tooled radius can be wiped and machine cleaned instead of trapping dirt in an open crevice. ### Finishes left undamaged Masking and disciplined tooling mean no sealant residue on fresh paint, flooring or panel faces — nothing to touch up afterwards. ### Speed at volume High-volume mastic is what we do daily, so hundreds of metres get delivered in planned visits rather than dragged out across the programme. ### Signed off, not snagged Runs walked with your site manager on completion, so the package closes out instead of reopening at client inspection. 06 In detail ## Materials, methods and the variations we cover ### Materials for floor and wall junctions Product selection follows the finishes and the use of the space. Neutral-cure silicones from Mapei, Illbruck, CT1 and Arbo are used where flexibility and cleanability matter and where the joint will not be painted. Where the specification requires the bead to be decorated as part of a wall finish, a paintable hybrid or acrylic-based mastic is used instead, because paint will not adhere to cured silicone. In wet and hygiene-critical areas — commercial kitchens, washrooms, changing facilities, healthcare and education wet zones — mould-resistant sanitary-grade products are used so the junction does not grey off within months of handover. Where the specification includes acoustic performance at partition junctions, an acoustic sealant is used to maintain the tested performance of the partition rather than a general-purpose product that looks the same and performs differently. ### Method: set-out, continuity and tooling Long runs are won or lost at set-out. We fix the bead width at the start and hold it, masking where the finish demands a hard edge, and plan each pass so it runs the full length of a wall rather than in short bursts. Continuous application is what removes the visible joins and width changes that make a long line look amateur; every restart is a potential shadow, so restarts are placed at corners and junctions where the eye expects a break. Tooling follows immediately behind the gun, before the sealant skins. A concave profile pushes the material into contact with both faces, seats it against the floor finish and skirting, and produces the even shadow line that reads as a designed detail. Waste, masking and residue are cleared as we go, because sealant residue left on vinyl or fresh paint is far harder to remove once cured — and it is exactly what gets written up at inspection. ### Variations we cover Floor-to-wall junctions to vinyl, safety flooring, resin, screed, tile, timber and carpet trims. Skirting and upstand sealing. Coved flooring top-edge sealing. Column, casing and duct base junctions. IPS panel and sanitary duct perimeters. Wall-to-wall and wall-to-soffit junctions. Plasterboard to blockwork, concrete and existing structure. Threshold and door-stop lines. Plant room, riser and back-of-house junctions where the requirement is function rather than appearance. Kitchen and food-preparation area junctions where hygiene products are specified. We also take on remedial packages: cutting out and replacing discoloured, split or inconsistent mastic installed by others, including runs that have already been rejected at inspection. ### Commercial focus, domestic application This is predominantly commercial work, priced per measured run and delivered against a programme with RAMS on request, CSCS-carded operatives and £2m public liability cover in place. On occupied buildings we phase the runs so corridors and floors stay usable, and we work around cleaning schedules rather than through them. The same detail appears at domestic scale in utility rooms, boot rooms, garages, home gyms and large tiled floors, where a sealed skirting line keeps water out of the wall base. The method is identical; only the quantity changes. 07 Questions ## What customers ask before booking How is floor-line mastic priced? By measured run, quoted free in writing after a take-off from your drawings and a site walk. Bead width, product and profile are agreed as part of the quote so the standard is set before we start. How much can you get done in a day? It depends on preparation and access, but high-volume mastic is our daily work — we plan visits so a floor plate is completed as a unit rather than left part-finished across weeks. When in the programme should we book you? After flooring is laid and adhesives have cured, and normally after decoration unless the specification says the bead is to be painted. Booking us too early means the line gets damaged by the trades following. Can the mastic be painted? Only if a paintable product is specified from the outset. Paint will not adhere to cured silicone, so tell us at quote stage if the bead forms part of a painted wall finish. How long will the mastic line last? In normal commercial use a correctly applied junction lasts for years and typically outlasts the floor finish. Areas cleaned with abrasive machines or heavy chemicals wear faster. We do not advertise a guarantee; we specify the product for the cleaning regime instead. Can you match the mastic to the floor or wall colour? Yes — colour-matched sealant is available so the junction reads with the flooring, skirting or wall finish rather than framing it in white. Do you cut out existing mastic that has been rejected? Yes. Remedial runs are a regular request: we cut out the failed or inconsistent bead, prepare the junction and reapply to a set width, then walk it with your site manager. Can you work in an occupied building? Yes. We phase runs so areas stay usable, work outside core hours where the site requires it, and keep the working zone clean and clearly marked. What paperwork do you provide for site? RAMS on request, CITB and CSCS accreditation, and evidence of £2 million public liability insurance — sent before induction so nothing delays the first day. Which areas do you cover? Kent, London and the South East from Chatham, including Maidstone, Sevenoaks, Tunbridge Wells, Kings Hill, Meopham, Whitstable, Tenterden, Bexley and the City of London. ## Related sealant services - [Commercial silicone sealant application](/services/commercial-silicone-sealant-application) Sealant packages for office refurbishments, new builds, building refurbishments and schools, worked to the main contractor's programme. - [Expansion joint sealing](/services/expansion-joint-sealing) Correctly sized and backed movement joints that flex with the structure instead of splitting through the middle. - [Acoustic sealant](/services/acoustic-sealant) Noise-reduction sealing to partitions, junctions and service penetrations where sound transfer matters. - [Colour-matched silicone sealant](/services/colour-matched-silicone-sealant) Beads matched to grout, frames, stone or cladding so the joint disappears into the finish instead of framing it. - [All sealant services](/services) ## Where we work Based at The Historic Dockyard in Chatham, covering Kent, London and the South East — including Sevenoaks, Tunbridge Wells, Maidstone, Kings Hill, Tenterden, Whitstable and City of London. [Floor line & wall joint mastic in Chatham](/service-areas/chatham)[Floor line & wall joint mastic in Maidstone](/service-areas/maidstone)[Floor line & wall joint mastic in Sevenoaks](/service-areas/sevenoaks)[Floor line & wall joint mastic in Tunbridge Wells](/service-areas/tunbridge-wells)[Floor line & wall joint mastic in Kings Hill](/service-areas/kings-hill)[Floor line & wall joint mastic in Meopham](/service-areas/meopham)[Floor line & wall joint mastic in Tenterden](/service-areas/tenterden)[Floor line & wall joint mastic in Whitstable](/service-areas/whitstable)[Floor line & wall joint mastic in Bexley](/service-areas/bexley)[Floor line & wall joint mastic in the City of London](/service-areas/city-of-london) [See all service areas](/service-areas) ## Hand over a floor plate with one straight mastic line through it Send the drawings and the programme date. We will take off the runs, agree the bead width and product, and come back with a free fixed price per metre. [Request a free estimate](/contact)[Call 07342 520584](tel:+447342520584) £2m public liability cover · CITB & CSCS accredited · RAMS on request · Mon–Sat, 7am–7pm · Sunday closed ![SP Silicone Sealants logo](/__l5e/assets-v1/ccba0574-1fb2-45c8-9c24-82adeb90c706/sp-logo-v5-light.webp) Specialist silicone sealant and mastic applicators serving domestic and commercial clients across Kent, London and the South East. [@SPSilicone](https://www.instagram.com/spsilicone) ### Opening Hours - Monday 7am – 7pm - Tuesday 7am – 7pm - Wednesday 7am – 7pm - Thursday 7am – 7pm - Friday 7am – 7pm - Saturday 7am – 7pm - Sunday Closed ### Contact - [07342 520584](tel:+447342520584) - [spsilicone@mail.com](mailto:spsilicone@mail.com) - The Historic Dockyard Chatham, Kent ME4 4QX ### Sealant Services - [Commercial silicone sealant application](/services/commercial-silicone-sealant-application) - [Bathroom, wet room & kitchen sealing](/services/bathroom-wet-room-kitchen-sealing) - [Window & door silicone sealing](/services/window-door-silicone-sealing) - [External silicone sealant](/services/external-silicone-sealant) - [Expansion joint sealing](/services/expansion-joint-sealing) - [Floor line & wall joint mastic](/services/floor-line-wall-joint-mastic) - [Sealant replacement — removal & reseal](/services/sealant-replacement-removal-reseal) - [Colour-matched silicone sealant](/services/colour-matched-silicone-sealant) - [Swimming pool & leisure sealant](/services/swimming-pool-leisure-sealant) - [Anti-mould sealant](/services/anti-mould-sealant) - [Acoustic sealant](/services/acoustic-sealant) - [Cladding & curtain walling sealing](/services/cladding-curtain-walling-sealing) - [All silicone sealant services](/services) ### Areas We Cover - [Sealant specialists in Chatham](/service-areas/chatham) - [Sealant specialists in Maidstone](/service-areas/maidstone) - [Sealant specialists in Sevenoaks](/service-areas/sevenoaks) - [Sealant specialists in Tunbridge Wells](/service-areas/tunbridge-wells) - [Sealant specialists in Kings Hill](/service-areas/kings-hill) - [Sealant specialists in Meopham](/service-areas/meopham) - [Sealant specialists in Tenterden](/service-areas/tenterden) - [Sealant specialists in Whitstable](/service-areas/whitstable) - [Sealant specialists in Bexley](/service-areas/bexley) - [Sealant specialists in the City of London](/service-areas/city-of-london) - [Every area we cover in Kent](/service-areas) Looking for something specific? We handle [bathroom silicone sealing in Chatham](/services/bathroom-wet-room-kitchen-sealing), [old sealant removal and reseal](/services/sealant-replacement-removal-reseal), [window and door perimeter sealing](/services/window-door-silicone-sealing), [commercial mastic applicators in Kent](/services/commercial-silicone-sealant-application), [expansion joint sealing for main contractors](/services/expansion-joint-sealing), [cladding and curtain walling sealing](/services/cladding-curtain-walling-sealing) and [swimming pool sealant work](/services/swimming-pool-leisure-sealant). See [photos of our recent sealant work](/our-work) or [meet the family-run team behind SP Silicone Sealants](/about). © 2026 SP Silicone Sealants Limited. 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