Hayes, BromleyPlatinumflatroofingltd@gmail.com - 07533 92109307753 651460 HomeAboutServices Service Areas Our WorkReviewsContact07533 921093Request Estimate Flat roofing Bromley - Flat roofing services - Balconies & walkways Flat roofing specialists · Bromley, Kent & London # Balcony & WalkwayWaterproofingin Bromley & London A waterproof, anti-slip surface you can actually use, with thresholds, drainage and upstands resolved so water leaves the balcony instead of ending up in the room below. Free fixed-price quotation and a 10-year workmanship guarantee. Request your free estimate07533 921093 16 years in flat roofing · trafficked systems · fully insured 16 years specialising in flat roofing Anti-slip trafficked finishes 10-year workmanship guarantee Fully insured, RAMS for commercial Free fixed-price quotations Overview ## What Balconies & walkways Involves & When You Need It ### What it is Balcony and walkway waterproofing is flat roofing that has to survive being walked on. We use reinforced liquid systems with anti-slip finishes and, where appropriate, single-ply with walkway membrane, over a build-up detailed for thresholds, drainage and the balustrade fixings that penetrate it. ### Who it is for Homeowners with a balcony or roof terrace over a habitable room, flat owners and freeholders with communal access walkways and decks, managing agents responsible for block balconies, and commercial clients with roof terraces and plant access routes. ### When it is needed When water is appearing in the room or hallway beneath, when the existing surface is cracked, lifting, chalky or slippery, when a balustrade has been refixed through the waterproofing, or when a balcony is being built or refurbished as part of wider works. ### Why a specialist matters Balconies concentrate every hard problem in flat roofing into a small area: a door threshold that is often too low, tight falls, a perimeter upstand at the balustrade, penetrations from posts and fixings, and constant foot traffic on the finished surface. A domestic-grade coating will not survive that, and a sheet system alone will not wrap the details. The solution has to be specified for use, not just for waterproofing. What happens if it is left ## Flat Roof Problems Do Not Stay the Same Size ### Water goes straight into the room below Balconies sit over habitable space. A failure here does not show on a garage ceiling, it shows on a bedroom ceiling, along with the plaster, decoration and joinery around it. ### Threshold water ingress Where the door threshold sits level with or below the balcony surface, heavy rain and blocked drainage push water under the door line. It is the single most common balcony defect and it will not be solved by another coat of anything. ### Structural decay in the deck Balcony decks that stay wet degrade, and on a raised structure that becomes a safety issue rather than a maintenance one. ### Slip hazards on communal walkways Worn, smooth or algae-covered walkway surfaces in blocks are a liability for the freeholder and managing agent as well as a nuisance for residents. ### Common mistakes we are called in to correct - Applying an unreinforced coating to a surface that gets daily foot traffic - Refixing balustrade posts through the waterproofing without re-detailing the penetration - Tiling over a balcony without a functioning waterproof layer beneath - Ignoring a low threshold and simply resealing the door - Blocking or undersizing the outlet so water sits against the door line Our process ## Five Steps from First Call to Guaranteed Roof - 01 ### Inspection We check the deck, falls, outlet, threshold height, balustrade fixings and the existing surface, and look at what is happening in the space below. - 02 ### Diagnosis & specification We establish whether the failure is the surface, the details or the drainage, then specify a trafficked build-up and finish for how the balcony is actually used. Free fixed-price quotation. - 03 ### Preparation & remedial works Existing failed surfaces removed, deck repaired, drainage corrected or upgraded, and threshold arrangements resolved where the design allows. - 04 ### Waterproofing & anti-slip finish Reinforced liquid system applied and fully detailed around posts, upstands and thresholds, with an anti-slip aggregate finish, or single-ply with walkway membrane where that suits better. - 05 ### Completion & guarantee Surface cured and checked, drainage tested, area left clean, and the work covered by a 10-year workmanship guarantee. What you get ## The Practical Difference a Specialist Makes ### Walkable and safe Anti-slip finishes designed for regular foot traffic, including communal walkways in blocks. ### Seamless around fixings Reinforced liquid wraps balustrade posts, upstands and thresholds in a continuous membrane with no joints to fail. ### Thresholds addressed We deal with the door line and the drainage together, because fixing one without the other does not stop the leak. ### Protects the room below The point of the work is that the ceiling underneath stays dry, permanently, not until the next storm. ### Minimal disruption Cold-applied, no hot works, and usually completed in a short programme with the property in use. ### Guaranteed workmanship A 10-year workmanship guarantee, quoted at a fixed price before we start. In detail ## Balconies & walkways: Materials, Methods & Variations ### Trafficked finishes and slip resistance The top coat on a balcony is doing two jobs: protecting the waterproofing from wear and giving grip in the wet. Anti-slip aggregate is broadcast into the resin and sealed, producing a durable textured surface. Finish choice takes account of how the balcony is used, a communal escape route in a block needs a different specification from a private balcony with two chairs on it. ### Thresholds and door details Adequate height between the finished balcony surface and the door threshold is what keeps water out, backed up by drainage that removes water before it can build. Where existing thresholds are too low, options include a threshold drain or channel, relocating and upsizing outlets, and adjusting the finished level within what the structure allows. We identify what is achievable at survey rather than promising it blind. ### Balustrades, posts and penetrations Every balustrade post that passes through the waterproofing is a potential leak. Posts are detailed individually with reinforcement dressed and sealed around the base, and where possible we prefer arrangements that fix into the upstand or fascia rather than through the horizontal surface. Refixing a balustrade after waterproofing without re-detailing is one of the fastest ways to undo the work. ### Terraces, tiled and raised finishes Roof terraces sometimes carry paving on pedestals or a tiled finish over the waterproofing. The waterproofing beneath still has to be a complete, fully detailed system with functioning drainage, decorative surfaces are not waterproofing, and any drainage layer below them has to reach an outlet. ### Communal walkways in blocks Access decks and walkways in blocks of flats take heavy footfall, need to stay usable during the works, and often have to be phased so residents keep access. Anti-slip specification, edge and upstand detailing, and outlet capacity are the priorities. RAMS are provided for the works and photographic reporting can be supplied to managing agents. ### Commercial roof terraces and plant access Where a roof is walked for plant maintenance, we specify a defined walkway route so traffic is not wearing the field membrane, protecting the roof and giving maintenance staff a marked path. On commercial sites we work to RAMS and are asbestos awareness trained for older buildings. ### Related services - Liquid waterproofing - Flat roof refurbishments & remedial works - Commercial flat roofing ### Where we work - Bromley - Kent - London - Buckinghamshire - Dartford - Orpington - Sevenoaks - Beckenham - Croydon - NationwideSee all service areasAll flat roofing servicesPlatinum Flat Roofing homeContact us Common questions ## Balconies & walkways, Your Questions Answered How much does balcony waterproofing cost?Every balcony is quoted individually, size, deck condition, threshold and drainage work and balustrade detailing all affect it. Quotations are free and fixed price as standard, with no 'from' prices. How long does the work take?Most single balconies are a short job of a few days, allowing for cure times between coats. Communal walkways in blocks are phased so access is maintained. Timings are confirmed in the quotation. Can you fix a leak coming through my balcony into the room below?That is exactly the work. We inspect the surface, threshold, drainage and penetrations to identify the actual entry point rather than recoating and hoping. Will the surface be slippery?No: trafficked areas are finished with an anti-slip aggregate specified for how the balcony or walkway is used. Can you waterproof under existing tiles or decking?The finish usually has to come up so the waterproofing can be applied to a properly prepared substrate and detailed at the edges. Paving on pedestals can often be lifted and relaid over the new system. My door threshold is very low, can that be fixed?Often, yes, through threshold drainage, upgraded outlets or adjusting finished levels within what the structure allows. We assess it at survey and tell you what is realistically achievable. How long will it last?A correctly prepared and reinforced trafficked system is a long-life surface. Wear depends on footfall and maintenance, and we back the workmanship for 10 years. Do you work for managing agents and freeholders?Yes, on communal balconies and walkways, with RAMS provided and photographic reporting available for records and service charge documentation. Which areas do you cover?Bromley, Kent, London and the South East, including Orpington, Beckenham, Croydon, Dartford and Sevenoaks. ## Get a Free Fixed-Price Quote for Balconies & walkways Tell us about the roof and your postcode. We will inspect it, tell you what has actually failed and give you a fixed price, backed by a 10-year workmanship guarantee. Request your free estimate07533 921093 16 years in flat roofing · Sika, Danosa and Bauder trained · fully insured · 10-year workmanship guarantee Single-ply and liquid-applied flat roofing specialists serving Bromley, Kent, London and the South East. ### Services - Single-ply roofing - Liquid waterproofing - Refurbishments & remedial works - Warm roof systems - New builds & extensions - Balconies & walkways - Rooflights - Fascias, soffits & guttering ### Service areas - Bromley - Kent - London - Buckinghamshire - Dartford - Orpington - Sevenoaks - Beckenham - Croydon - Nationwide ### Contact - Hayes, Bromley - 07533 921093 - 07753 651460 - Platinumflatroofingltd@gmail.com - @platinumflatroofingltdCompany No. 17149842Fully insured · 10-year workmanship guarantee © 2026 Platinum Flat Roofing Ltd. All rights reserved.ReviewsPrivacy policyTerms & conditions Call nowFree quote