Mastic man in Southwark

Sealant jobs we do in Southwark

Southwark stretches from the riverside at Bankside and London Bridge down through Walworth, Camberwell and Peckham to Dulwich, and almost every type of London home can be found somewhere in it. When a shower tray starts leaking, a bath seal goes black or window mastic splits, the fix is the same: take the old sealant out properly and start again.

Mr Mastic is based in Crawley and covers the whole borough. We reseal baths, showers, basins and worktops, renew mastic around windows and doors and seal external joints. If you live in a flat and water is reaching the ceiling below, our guide to leaking shower sealant explains the usual causes and what we check first.

Estates, warehouses and Georgian squares

At the 2011 census Southwark had the highest proportion of social housing in England, at 43.7%. Much of it is in large post-war estates. The Aylesbury Estate in Walworth was built from 1963 to 1977 as large concrete slab blocks and has been under phased redevelopment since 2009, while the Heygate Estate at Elephant and Castle was demolished and replaced by Elephant Park. Concrete blocks move differently from brick, and the joints around frames and between panels need a sealant that can cope with that movement.

The borough also has 53 conservation areas, from Camberwell Grove and Dulwich Village to Bermondsey Street, Trinity Church Square and Rye Lane Peckham. Dulwich Village keeps nearly all of its 18th and 19th century buildings, and much of Peckham was covered in Victorian housing after the railway arrived in 1865. Sash windows and old timber frames are common here, and the mastic around them is often decades old.

Then there are the newer homes. Former warehouses at Butler’s Wharf and around Bermondsey Street are now flats, towers such as Strata SE1 rise over Elephant and Castle, and the Canada Water masterplan, approved in 2020, is adding more. Converted warehouses and new flats alike tend to have compact bathrooms where sealant takes heavy daily use.

Our services in Southwark

• Bathroom & kitchen resealing: Mouldy or split sealant around baths, shower trays, basins and sinks removed completely and replaced with a neat, hygienic bead.
• Window & door mastic: Window and door mastic that has dried out in the sun replaced with a weather-resistant joint that can move with the frame.
• Commercial & hotel sealant: Hotels, offices, washrooms and welfare areas resealed room by room, with out-of-hours working possible to arrange.
• Remedial sealant & repairs: Second opinions on sealant that keeps failing: we strip it out, check for movement or leaks and reseal it properly.
• Fire-rated sealant: Fire-rated sealant for service penetrations and frame gaps where it has been specified, applied to the tested details.
• External & façade joints: Expansion joints in brick, render and cladding cut out and renewed at the right depth so they can move without splitting.
• New-build mastic & snagging: New-build bathrooms, kitchens and frames resealed where the original sealant has cracked as the house settles.
• Floor & skirting joints: Floor and skirting joints in homes, shops and warehouses sealed neatly and to the right depth.
• Regrouting: Crumbling grout in showers and wet areas raked out and refilled, so water stays out of the wall behind.
• Glazing & conservatory sealant: Leaking conservatory and rooflight joints, glass panels and shower screens resealed with silicone made for glass.
• Gutter, fascia & soffit sealing: Leaking gutter joints, end caps, fascia and soffit joints resealed with exterior sealant.
• Sand mastic for sash & case windows: Sash and case window surrounds in stone and brick re-pointed with traditional sand mastic.

What you get with Mr Mastic in Southwark

Flats bring extra responsibility, because a poor seal can damage someone else’s home. That is why we take care over every joint. Mr Mastic has more than 20 years’ experience, full insurance and ARBOMaster approved applicator status, and we work with Arbo and Everbuild sealants. We have completed 2,847+ projects and hold a 4.9-star Google rating from 180+ five-star reviews. Before any work starts you get a clear quote, and afterwards a one-year guarantee.

Places we pass in Southwark

The nearest station to the town centre is Elephant & Castle station. Local landmarks include Gabriel's Wharf (0.7 miles north-west), Museum of Life Sciences (less than half a mile north-east) and Baynard's Castle (0.8 miles north). Closer in, we work on homes, rented flats and businesses near Charles Dickens Primary School, Ark Globe Academy, London School of Musical Theatre and Borough Welsh Congregational Chapel. Green spaces within reach include Bellenden Road Nature Garden and Ludgate Hill.