--- title: "Window & Door Silicone Sealing in Chatham, Kent | SP Silicone Sealants" description: "Window and door perimeter silicone sealing in Chatham and across Kent. Draught-proof, weathertight frame joints for homes, refurbishments and new builds. 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Draught-proof, weathertight frame joints for homes, refurbishments and new builds. Free quotes.", "serviceType": "Window & door silicone sealing", "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 much does it cost to reseal windows and doors?", "acceptedAnswer": { "@type": "Answer", "text": "It is quoted per job, free of charge, based on the number of openings, the length of perimeter and how the openings are reached. Small ground-floor jobs can usually be priced from photographs; whole elevations are quoted after a site visit." } }, { "@type": "Question", "name": "How long does a house full of windows take?", "acceptedAnswer": { "@type": "Answer", "text": "Most domestic properties are a day's work for the openings that need doing, sometimes two where a lot of old sealant has to be cut out or access is awkward. We will tell you the duration with the quote." } }, { "@type": "Question", "name": "Will resealing stop my draught completely?", "acceptedAnswer": { "@type": "Answer", "text": "It stops draughts coming through the perimeter joint between frame and reveal, which is the most common source. If air is coming through the frame itself — worn gaskets, a dropped sash, a failed hinge — that is a window repair, and we will say so rather than seal over it." } }, { "@type": "Question", "name": "Can you seal in winter, or in the rain?", "acceptedAnswer": { "@type": "Answer", "text": "We seal year-round, but the joint has to be dry and above the product's minimum application temperature. Wet or frosty substrates get rescheduled — sealing damp masonry is how you buy a failed joint." } }, { "@type": "Question", "name": "How long will the new sealant last?", "acceptedAnswer": { "@type": "Answer", "text": "A correctly specified external perimeter joint typically gives many years of service and often well over a decade, depending on exposure, UV and how much the frame moves. Internal beads last longer because there is no weather or UV loading. We do not advertise a guarantee; we size and prepare the joint so it lasts on merit." } }, { "@type": "Question", "name": "Can the sealant be painted or colour-matched?", "acceptedAnswer": { "@type": "Answer", "text": "Internally, a paintable product can be used where the joint will be decorated. Externally, colour-matched silicone is available in a range of shades so the bead reads with the frame, render or brick instead of standing out as a white line." } }, { "@type": "Question", "name": "Do you seal newly fitted windows for other trades?", "acceptedAnswer": { "@type": "Answer", "text": "Yes. We work for main contractors, developers and window installers who want the perimeter pointing done properly across a project rather than rushed by the fitting teams." } }, { "@type": "Question", "name": "Do you work at height?", "acceptedAnswer": { "@type": "Answer", "text": "We work from the access equipment provided on commercial sites — scaffold, towers or MEWPs. On domestic jobs we cover what can be reached safely; where scaffold is needed we will say so up front so it can be planned." } }, { "@type": "Question", "name": "Do you cover Chatham and the surrounding towns?", "acceptedAnswer": { "@type": "Answer", "text": "Yes — we are based at The Historic Dockyard in Chatham and cover Kent, London and the South East, including Maidstone, Sevenoaks, Tunbridge Wells, Kings Hill, Meopham, Whitstable, Tenterden, Bexley and the City of London." } }, { "@type": "Question", "name": "How do I pay?", "acceptedAnswer": { "@type": "Answer", "text": "Smaller jobs by bank transfer on completion; larger and commercial jobs are invoiced. Quotes are always free." } } ] } ] --- 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 ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) [Home](/)/ [Services](/services)/ Window & door silicone sealing Perimeter frame sealing — Kent & London # Window & Door Silicone Sealing in Chatham weathertight perimeter joints Warmer rooms, no whistling draughts and no water running down the inside of the reveal — frame perimeters cut out, prepared and resealed in weather-grade silicone that stays flexible through a Kent winter. [Request a free estimate](/contact)[07342 520584](tel:+447342520584) Free quotes, £2m public liability cover, and honest advice when the problem is the frame or the cill rather than the sealant. £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 perimeter sealing covers Every window and external door sits in an opening slightly larger than itself. That gap — between frame and brick, render, stone or timber reveal — is closed with sealant, internally and externally. External beads keep driving rain and wind out; internal beads stop draughts and air leakage across the junction. We remove failed or missing perimeter sealant, clean and prepare both faces of the joint, size the joint with backing rod where it is deep or irregular, and apply a weather-grade silicone tooled to a clean, even line that follows the frame. Cills, thresholds, trickle-vent junctions and mullion-to-frame joints are included, because those are the points where water actually finds its way in. ### Who it is for Homeowners with draughty or leaking windows, especially in older Kent housing stock where frames have been replaced into openings that were never made good properly. Also landlords preparing properties for letting, and anyone who has had new windows fitted and been left with thin, patchy or already-split perimeter beads. On the commercial side: main contractors and developers needing perimeter pointing across new builds, office refurbishments, building refurbishments and schools, where hundreds of metres of frame perimeter need sealing to a consistent line at handover. ### When it is needed When you can feel air movement around a closed window, when there is a visible gap or a shrunken bead between frame and reveal, when the sealant has gone hard and crazed rather than rubbery, or when water appears on the inside of a reveal or cill after wind-driven rain. Also immediately after window or door replacement, after render or brickwork repairs around openings, and as part of any external refurbishment where access equipment is already in place — sealing while the scaffold is up costs a fraction of sealing after it has been struck. ### Why professional application matters Perimeter joints are the hardest working joints on a building. They face UV, wind-driven rain and daily thermal movement — an aluminium or uPVC frame expands and contracts noticeably between a frosty morning and a sunny afternoon. That movement is why a hard, over-thin or three-sided bead splits within a couple of seasons. Getting it right means matching the product to the substrate (coated aluminium, uPVC, timber, brick, render and natural stone all behave differently), sizing the joint so the sealant can stretch, priming where the manufacturer requires it, and tooling the bead so water is shed off the face rather than sitting on a flat ledge of silicone. 02 Recent work ## Window & door silicone sealing — completed jobs ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) [See the full gallery](/our-work) 03 What it costs to leave it ## A failed seal never stays a small problem A failed perimeter joint costs you money every day it stays open — first in heat straight out of the building, then in damage to the fabric around the opening. Neither shows up as a dramatic event, which is precisely why it gets ignored until the plaster is spoiled. ### Heat and money out of the gap Air leakage around frames is one of the largest uncontrolled heat losses in an older house. You feel it as a cold room that never quite warms up, and pay for it on every heating bill through the winter. ### Water into the reveal and cill Driving rain finds any break in an external bead, tracks behind the frame and wets the reveal, cill and internal plaster. Left alone it lifts paint, blows plaster and rots timber sub-cills and window boards. ### Damp, mould and stained finishes Persistently wet reveals grow mould around the frame and stain decoration in a hard band you cannot paint out. The repair then involves replastering and redecorating, not just resealing. ### Mistakes we get called out to fix - Sealing over a split, hard bead instead of cutting it out, so the new silicone moves with the old failing layer. - Using a cheap acrylic frame sealant externally — it has almost no movement capability and crazes within a season or two. - Filling deep or irregular perimeter gaps solid with sealant instead of using backing rod to control depth. - Sealing over damp render or brickwork after rain, or without cleaning dust from the reveal, so adhesion fails on the masonry side. - Sealing external trickle vents and drainage slots closed, trapping water inside the frame instead of letting it escape. 04 How a job runs ## The order of work, start to finish ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) Step 01 — Inspection of the openings 1. 01 ### Inspection of the openings We check every perimeter for splits, gaps, hard sealant and evidence of water tracking, and identify whether the problem is the joint, the frame or the cill detail. ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) 2. 02 ### Free quote by opening count You get a fixed written price based on the number of openings, the perimeter runs and the access needed — from photos on small jobs, after a site visit on larger ones. ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) 3. 03 ### Cut out & preparation Old sealant removed from both faces, joints cleaned of dust and residue, damp substrates allowed to dry and porous reveals primed where required. ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) 4. 04 ### Backing rod & application Deep or irregular joints are packed with closed-cell backing rod to control depth, then a weather-grade bead is applied and tooled to shed water. ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) 5. 05 ### Weather check & clean up We check the completed line against the frame drainage, confirm nothing is bridged that should stay open, and remove all masking and debris. ![Large glass sliding doors sealed to a timber-beamed opening](/__l5e/assets-v1/ecbc5ba9-a7e9-4177-bd7c-0b26a00a2cec/window-door-silicone-sealing-01.jpg) 05 What you get ## The difference a properly detailed finish makes ### Rooms that hold their heat Closing air leakage around frames removes the draught you feel at ankle height and the cold spot next to the window. ### Weathertight in driven rain External beads sized and tooled properly keep wind-driven Kent rain out of the reveal instead of channelling it in. ### Protects the frame and cill Water kept off timber sub-cills and out of frame junctions extends the life of the whole window, not just the joint. ### Flexible through the seasons Low-modulus, weather-grade products accommodate the daily expansion and contraction of uPVC and aluminium frames without tearing. ### A clean line to the frame Consistent width and a straight run along the frame edge, cut in neatly at cills, heads and mullions. ### Cheap while access is up Sealing while scaffold or a tower is already in place removes the biggest cost in external work — getting back up to the opening. 06 In detail ## Materials, methods and the variations we cover ### Products and substrates Perimeter joints are sealed in weather-grade, movement-accommodating silicone from Mapei, Illbruck, CT1 and Arbo, chosen against the substrate. Neutral-cure low-modulus silicones are used where the joint meets coated aluminium, powder-coated frames, natural stone or polished finishes, because acidic-cure products can attack coatings and stain porous stone. uPVC, timber and render each get a product and preparation regime that suits them. Porous masonry and render often require priming for reliable adhesion; freshly painted or freshly rendered reveals need to be genuinely cured before sealing, not just dry to the touch. Where a joint will be decorated over internally, a paintable sealant is specified instead of pure silicone, because paint will not hold on a silicone face. ### Method: geometry, depth and drainage The perimeter gap around a replacement window is rarely even. Old openings are out of square, brick reveals are irregular, and gaps of 3mm at one end and 15mm at the other are normal. Sealing that as one continuous bead of whatever depth the gap happens to be produces a joint that is far too thick in places and cannot flex. Closed-cell backing rod is pressed into the deeper sections first to establish a consistent depth and prevent adhesion to the back of the joint, which is what allows the bead to stretch across two faces only. The second detail is drainage. Windows are designed to let water that gets into the frame escape through drainage slots and to breathe through trickle vents. Those must stay open. A bead run blindly along a frame can seal a drainage path shut and turn a working window into a reservoir, which is why we check the frame detail before sealing rather than after. ### Variations of window and door sealing we cover External perimeter pointing to uPVC, aluminium, timber and composite frames. Internal perimeter sealing at reveals, heads and window boards. Cill and sub-cill junctions, threshold and door-frame bases, French and bi-fold door perimeters, patio and sliding-door tracks. Bay window junctions, mullion and transom joints, and glazing-bead pointing where appropriate. Sealing to render, brick, block, stone, timber cladding and rainscreen reveals. On commercial sites the same work scales up to whole elevations, often alongside curtain walling and cladding joints, worked from the access equipment provided and phased around other trades on the facade. ### Domestic and commercial differences In a house, the job is typically a handful of openings, reachable from the ground or a tower, completed in a day, with the priority on draughts, comfort and a tidy line. We are also honest when sealant is not the answer: if a cill is failing, a frame is not packed correctly or the render detail above the head is dumping water into the joint, sealant will only hide it for a season and we will tell you that at the quote stage. On commercial elevations the concerns are consistency, access and inspection. Beads must read the same width from ground level across the whole facade, work must be planned around scaffold or MEWP availability, and joints have to survive a clerk-of-works walk-round. £2m public liability cover, CITB and CSCS accreditation and RAMS on request keep that side straightforward. 07 Questions ## What customers ask before booking How much does it cost to reseal windows and doors? It is quoted per job, free of charge, based on the number of openings, the length of perimeter and how the openings are reached. Small ground-floor jobs can usually be priced from photographs; whole elevations are quoted after a site visit. How long does a house full of windows take? Most domestic properties are a day's work for the openings that need doing, sometimes two where a lot of old sealant has to be cut out or access is awkward. We will tell you the duration with the quote. Will resealing stop my draught completely? It stops draughts coming through the perimeter joint between frame and reveal, which is the most common source. If air is coming through the frame itself — worn gaskets, a dropped sash, a failed hinge — that is a window repair, and we will say so rather than seal over it. Can you seal in winter, or in the rain? We seal year-round, but the joint has to be dry and above the product's minimum application temperature. Wet or frosty substrates get rescheduled — sealing damp masonry is how you buy a failed joint. How long will the new sealant last? A correctly specified external perimeter joint typically gives many years of service and often well over a decade, depending on exposure, UV and how much the frame moves. Internal beads last longer because there is no weather or UV loading. We do not advertise a guarantee; we size and prepare the joint so it lasts on merit. Can the sealant be painted or colour-matched? Internally, a paintable product can be used where the joint will be decorated. Externally, colour-matched silicone is available in a range of shades so the bead reads with the frame, render or brick instead of standing out as a white line. Do you seal newly fitted windows for other trades? Yes. We work for main contractors, developers and window installers who want the perimeter pointing done properly across a project rather than rushed by the fitting teams. Do you work at height? We work from the access equipment provided on commercial sites — scaffold, towers or MEWPs. On domestic jobs we cover what can be reached safely; where scaffold is needed we will say so up front so it can be planned. Do you cover Chatham and the surrounding towns? Yes — we are based at The Historic Dockyard in Chatham and cover Kent, London and the South East, including Maidstone, Sevenoaks, Tunbridge Wells, Kings Hill, Meopham, Whitstable, Tenterden, Bexley and the City of London. How do I pay? Smaller jobs by bank transfer on completion; larger and commercial jobs are invoiced. Quotes are always free. ## Related sealant services - [External silicone sealant](/services/external-silicone-sealant) Weatherproof external joints specified for UK exposure and movement — brick, render, stone, cladding and copings. - [Cladding & curtain walling sealing](/services/cladding-curtain-walling-sealing) Facade and curtain walling joints sealed to line and detail at height, from the access provided. - [Sealant replacement — removal & reseal](/services/sealant-replacement-removal-reseal) Old, split or blackened sealant cut out completely, substrate prepped and treated, then resealed properly. - [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. [Window & door silicone sealing in Chatham](/service-areas/chatham)[Window & door silicone sealing in Maidstone](/service-areas/maidstone)[Window & door silicone sealing in Sevenoaks](/service-areas/sevenoaks)[Window & door silicone sealing in Tunbridge Wells](/service-areas/tunbridge-wells)[Window & door silicone sealing in Kings Hill](/service-areas/kings-hill)[Window & door silicone sealing in Meopham](/service-areas/meopham)[Window & door silicone sealing in Tenterden](/service-areas/tenterden)[Window & door silicone sealing in Whitstable](/service-areas/whitstable)[Window & door silicone sealing in Bexley](/service-areas/bexley)[Window & door silicone sealing in the City of London](/service-areas/city-of-london) [See all service areas](/service-areas) ## Stop paying to heat the outside of your building Tell us how many openings need sealing and send us a photo of a typical opening. You will get a free fixed price back, and an honest answer about whether sealant alone will solve it. [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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