Wokingham · England
Mastic man in Crowthorne
Resealing and mastic for Crowthorne’s Victorian roads, Edgcumbe Park’s mid-century homes and newer houses between Wellington College and Broadmoor.
- Fully insured
- Arbo and Everbuild sealants
- Clear quote before we start
Sealant jobs we do in Crowthorne
Crowthorne was only a hamlet until Wellington College opened in 1859. Broadmoor Hospital followed in 1863 and the railway station in 1860, and the village grew quickly around them. Today its homes sit mostly in Crowthorne parish, in Bracknell Forest, with part of the built-up area running into Wokingham Without. Mr Mastic covers the whole village from our base in Crawley.
We reseal baths, showers, kitchen worktops and basins, renew window and door mastic, and replace tired joints outside. Every job starts the same way: the old sealant comes out completely, mould is treated, the surface is cleaned and dried, and only then does new silicone go on. Silicone laid over silicone does not bond, so we never cut that corner. If black spots keep coming back, our anti-mould resealing page explains how we deal with it.
From Victorian growth to Edgcumbe Park
The college, the hospital and the railway gave Crowthorne its first wave of houses in the later nineteenth century, and many of those properties have since had kitchens and bathrooms replaced more than once. Layers of old sealant, baths that have dropped a few millimetres on timber floors and worktop joints pulled away from the tiles are typical of what we find.
Edgcumbe Park, off Dukes Ride, is the village’s most recognised estate. It was built between 1958 and 1972 by the Renway Construction Company and is an award-winning example of mid-century modern design. Houses of that era often have generous glazing, and the joints where frames meet brick, timber or panels are usually on their second or third set of mastic. Where the original sealant has hardened, it no longer moves with the frame and splits; we replace it with a flexible, weatherproof bead and backing rod where the gap is deep.
Newer houses have their own pattern. Builder sealant in showers often fails within the first couple of years as the house settles, and our new build mastic page sets out what we check.

Woodland, heath and leafy roads
Crowthorne is surrounded by pine woodland and heath, with Pinewood to the north, Heath Lake on the northern edge and the Sandhurst to Owlsmoor Bogs and Heaths to the south-east. Trees close to houses mean shade and damp on north-facing walls, and pine needles and debris collect on sills. External mastic in those spots stays wet for longer and picks up dirt and algae, so we clean back to sound material before sealing and choose a product suited to the exposure.
Most homes here are houses rather than blocks, so access is usually simple. Where you live in a flat, we can liaise with the managing agent about keys and parking before the visit.
Schools, care settings and the TRL site
The village’s large institutions, Wellington College and Broadmoor Hospital, shape its working life, and alongside them is the former Transport Research Laboratory site. In 2012 Bracknell Forest Council identified the original TRL site as suitable for around 1,000 homes, so new housing and its snagging are part of Crowthorne’s future. For care homes and clinics, our healthcare sealant page explains how we work around residents and patients.
We also reseal for landlords and letting agents, usually between tenancies.
From first call to finished joint
- Get in touch. Call or email with the job, your postcode and a few photos if you have them.
- Quote and booking. We quote clearly before anything starts and fix a day that works for you.
- Strip back the old joint. Every bit of old sealant is removed and the joint is cleaned, treated for mould and dried.
- Neat new sealant. Each joint gets the sealant that suits it, laid and smoothed to a tidy finish.
- Guaranteed work. You’ll know the cure time before we leave, and every job comes with a one-year guarantee.
What we do in Crowthorne
- Bathroom & kitchen resealing: Every joint in the bathroom and kitchen, from the bath edge to the worktop, stripped back and resealed with anti-fungal silicone.
- Window & door mastic: Frame perimeters inside and out resealed with flexible, colour-matched sealant, with backing rod where the gap is deep.
- Commercial & hotel sealant: Sealant programmes for offices, hotels, care settings and schools, with early or late working where it helps.
- 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 and intumescent sealant around gaps, frames and service penetrations, to the product’s 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: Shower and splashback grout replaced where it has cracked or stained, with silicone in the movement joints.
- Glazing & conservatory sealant: Glazing joints on conservatories, roof lanterns and screens renewed with a sealant suited to glass and frames.
- Gutter, fascia & soffit sealing: Dripping gutter joints and end caps, and gaps at fascias and soffits, sealed with weatherproof exterior sealant.
- Sand mastic for sash & case windows: Traditional burnt sand mastic renewed around sash and case windows and doors in stone and brick.
Why choose Mr Mastic in Crowthorne
Crowthorne is an easy run across from Crawley, and the work comes with the same backing as at home. We have been sealing for over 20 years, we are fully insured and ARBOMaster approved, and we use Arbo and Everbuild products we trust. More than 2,847 projects and 180+ five-star Google reviews, averaging 4.9 stars, sit behind every quote. The price is agreed clearly at the start, and the finished job has a one-year guarantee.
Around Crowthorne
For trains, Crowthorne station is closest to the centre. Places most people will know nearby are The Lexicon (3.7 miles north-east) and Staff College Museum (3.1 miles south-east). Typical jobs near the centre are in homes and businesses around Crowthorne Church of England Primary School, King Edward VI Aston School, Crowthorne Methodist Church and The Prince pub. For open space, Wildmoor Heath and Heath Lake are close by.
What customers say
Rated 4.9 on Google from 180+ five-star reviews. Read the reviews on Google.
“New build in Forge Wood — shower seal had failed after 16 months. Mr Mastic came out quickly, removed everything and did it properly. Perfect finish and no more leaks.”
“Harper Drive in Maidenbower — kitchen worktop had been leaking behind for a while. Came out the next day, sorted it properly. Really tidy job.”
“Called for a bathroom reseal and the mastic man showed up on time with all the right equipment. Brilliant attention to detail. The sealant looks perfect and they kept everything tidy.”
Parts of Crowthorne we work in
Select your area for more local detail, or call 07833 053749 or email us with your postcode.
Also near Crowthorne
Your questions about mastic work in Crowthorne
Do you cover all of Crowthorne?
Yes. We cover the whole village, including Edgcumbe Park, the Pinewood side and the roads near the station, and nearby Sandhurst, Owlsmoor and Bracknell.
I live on Edgcumbe Park. Can you replace the mastic around our large windows?
Yes. We cut out the old, hardened mastic, clean the frames and surrounds, and apply a flexible weatherproof sealant that suits the materials.
Why does the sealant on my north-facing window go green?
Shade and damp let algae and dirt settle on the bead. We clean back to sound material, reseal and suggest gentle cleaning to keep it clear.
Will you deal with snagging sealant on a new home?
Yes. Shower and bath sealant in new homes often fails as the building settles. We remove it, prime where needed and reseal.
Can you work in a care home without disturbing residents?
Yes. We work room by room, keep noise and mess down, and can agree times with the manager.
Is Crowthorne in Wokingham or Bracknell Forest?
Most of the village is in Crowthorne parish in Bracknell Forest, with part of it in Wokingham Without. We cover both.
Can you reseal a kitchen worktop where the sealant has gone black?
Yes. We strip the old bead, treat the mould underneath and reseal with a suitable silicone, using a food-safe product near the sink.
Is the work guaranteed?
Yes. Every job has a one-year guarantee.
