Windsor and Maidenhead · England
External & façade joints in Dedworth, Windsor and Maidenhead
Professional external mastic in and around Dedworth, with every bit of old sealant taken out first and a 12-month guarantee.
- Damp patches traced to an open external joint
- Panel joints letting water in
- Weathered mastic that no longer stretches
External mastic in Dedworth: local notes
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as St Leonard's Hill (about 0.6 miles south) nearby, there’s older building stock in the area around Dedworth as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
If you let a flat or house near Windsor & Eton Central station, split movement joints are easy to miss on a rental until damp shows inside. For an older house near a landmark such as All Saints Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Dedworth is about 1 mile west of Windsor, in Windsor and Maidenhead. We carry out external mastic for homes and businesses in Dedworth and nearby, as part of our work across Windsor and Maidenhead. Our Windsor and Maidenhead coverage runs to 57 places, and Dedworth is one of them. We also work in Reading, around 14 miles away.
We work across the SL4 postcode area for external mastic. Streets in the area include Ash Lane, Wolf Lane and Roses Lane, all of which we cover. We also cover Windsor (1 mile east), Oakley Green (1 mile west), Boveney (1 mile north), Clewer (1 mile north-east) and Water Oakley (1 mile north-west). Within a short drive, we also cover Maidenhead (5 miles north-west), Boyn Hill (5 miles north-west), North Ascot (5 miles south-west), Cookham (7 miles north-west), Furze Platt (6 miles north-west) and Broomhall (6 miles south). Dedworth is among the bigger towns we cover in Windsor and Maidenhead.
What’s near Dedworth
Around Dedworth, our work takes us to homes and buildings near Windsor Girls' School, Windsor Girls' School and The Greene Oak pub, among other places. For rail, the closest station is Windsor & Eton Central station, roughly 1.7 miles east. Other landmarks nearby include Windsor Castle (1.9 miles east) and King Edward VII Hospital (1.5 miles east). Not far away are Bray Pit and Taplow Lake.
About our external mastic in Dedworth
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we will confirm what’s needed to reach them safely. Common call-outs are for weeds or debris growing in open joints and movement joints filled with mortar instead of sealant, across façade panels, render & cladding joints and joints between brick and frames.
Houses in smaller places like Dedworth can stand more in the open than those in a built-up town, and walls and rooflines facing the weather take the worst of it. Joints on those sides are usually the first to go.
Your job is guaranteed for a year, as with all our work.
- Location
- Dedworth (SL4)
- Region
- Windsor and Maidenhead
- Cover
- One year on every job
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How we quote for external mastic
We quote each job individually. This is what makes a difference:
- The product the joint needs
- Whether there’s mould to deal with
- Any working-time requirements on site
- How easy the joints are to reach
The cost depends on the size of the job, how much old material has to come out and how easy the joints are to reach. We give a clear quote before we start.
What we need to know
When you call or email, it’s useful to know:
- Any previous sealing or DIY work
- How many joints, rooms or windows are involved
- A few photos by email, if you can
- Where the property is
For external mastic in Dedworth, ring 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and you will get a clear quote before any work starts.
DIY sealant or a professional job?
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Sealing over old silicone is the commonest DIY error. Silicone does not stick to old silicone, so it lifts and traps water and mould underneath. Everything old must be removed first.
Nearby places to Dedworth
What else we do in Dedworth
Signs you need external mastic in Dedworth
Sunlight, wet weather and frost wear exterior sealant down. Over the years it hardens, cracks on the surface and loses its give, so the joint eventually tears or comes away from one side.
The problems people generally mention when they call are:
- Failed seals between different materials
- Damp patches traced to an open external joint
- Movement joints with cracked, split or missing sealant
- Joints where the bead has come unstuck
Managing a site like Dedworth Green First School? Then its movement joints, gutters and trims need looking after like any other building’s.
Questions to ask before you book
- How much experience the applicator has
- Whether the sealant suits the joint
- What guarantee comes with the work
- Whether they’re fully insured
What happens on the day
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes a few hours to a few days, depending on the length of joint and the access, including the tidy-up. For a job in Dedworth, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Where the joints are inside, avoid wetting them before we arrive
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
Getting a quote
Asking for a quote is easy: let us know the job and the location. Photos by email help us understand the job, and we’ll come back to you with a quote.
Related advice
Questions from Dedworth
Do you work for landlords with property near Windsor & Eton Central station?
Yes, landlords and agents are among the people we work for, and several properties can be quoted together. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we will give you a clear quote.
Can you do external mastic in Dedworth?
Yes. We work across London and the South East, and Dedworth is part of that. Just phone 0345 464 0079 or email us with a few details of the job, and we’ll give you a clear quote.
Why is there a gap in my brick wall?
A vertical gap in a long brick wall is normally a movement joint. It gives the wall room to move and needs a flexible seal, not mortar.
Can you seal joints between render and window frames?
Yes. The old joint is removed, both surfaces cleaned and primed where needed, and a flexible sealant applied. We pick a colour that works with both materials.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
When is the sealant fully cured?
That depends on the sealant used, so follow the cure time we give you.
How often do external joints need resealing?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges, and reseal at that point.
Is it OK to seal over old sealant?
No, because it fails. We remove every bit of old sealant first, so the new sealant bonds properly.
Landlord and commercial work in Dedworth
A neglected joint can let water reach the structure, which is a bigger problem in a rented property. Keeping joints in good order is simple maintenance that we can handle for you.
Failed sealant is one of the commonest items on a check-out report, and it’s easy to sort out between tenants. We can quote for more than one property at once.
Why deal with it now?
Water gets in through a failed movement joint, behind render and cladding. Resealing early keeps the job to the joint itself, rather than the wall around it. Around Dedworth, water from a failed joint in an older home can soak into timber and plaster, which is far harder to put right than the sealant itself.
Doing several joints on one visit is normally more efficient than separate visits, so it’s worth mentioning everything you’d like done. We’ll give you a clear price for the lot.
Why us?
- 180+ five-star Google reviews
- A sealant colour to suit the surroundings
- An ARBOMaster approved applicator
- Every job guaranteed for a year
Read our cost guide or our reviews.
What we cannot put right
New sealant cannot fix everything, and we’d rather say so up front. Sealant won’t put right:
- Subsidence or other structural problems
- Adding movement joints to masonry that has none
- Cracks in the bricks or render themselves, away from the joints
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Joints and surfaces we work on
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Concrete & block
- Copings & trims