Windsor and Maidenhead · England
Frogmill External Mastic
Problem with your movement joints in Frogmill? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
- Rain getting behind render or cladding at a joint
What affects the cost of external mastic
Every job gets its own quote. This is what makes a difference:
- The size of the job
- When we can work, for business premises
- Any mould that needs treating
- How much old sealant there is and how hard it is to remove
The cost reflects the work involved, not a rough estimate. That is why we ask about the job first.
What we need to know
There’s no need for technical detail. Just tell us:
- The address or postcode of the job
- Access, such as stairs, a lift or height
- The type of property
- Roughly how big the job is
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is, and email photos if that is easy.
About our external mastic in Frogmill
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. We work on copings & trims, render & cladding joints and concrete & block, and the jobs we see most are plants rooting in failed movement joints and damp patches traced to an open external joint.
Around Frogmill, older buildings can be stone, brick or timber-framed, many with extensions added later. Where one material meets another is where water generally gets in.
Your job is guaranteed for a year, as with all our work.
- Where
- Frogmill (SL6)
- Wider area
- Windsor and Maidenhead
- Guarantee
- 12 months on all our work
- Quotes
- A clear price before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Common problems we fix in Frogmill
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
The problems people normally mention when they call are:
- Weathered mastic that no longer stretches
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
- Sealant that has lost its bond to the brick or render
If you look after a building such as Danesfield School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Comparing quotes
- What guarantee comes with the work
- What happens if they find a problem under the old sealant
- Which colour the sealant will be
- What insurance they hold
Walls and rooflines in Frogmill
With historic houses such as Harleyford Manor (about 1 mile north-east) nearby, there’s older building stock in the area around Frogmill as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of St Peter and St Paul include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move. For landlords with property near Henley-On-Thames station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Frogmill is about 3 miles south-west of Marlow, in Windsor and Maidenhead. If you need external mastic in Frogmill, please ring 0345 464 0079 or drop us an email for a quick quote. We cover Windsor and Maidenhead from our Crawley base. Across Windsor and Maidenhead, we cover 57 places, and Frogmill is one of them. For nearby work, see our Reading page, about 9 miles away.
All of SL6 is within our area for external mastic, from the main roads to the quietest streets. We also cover the places around Frogmill: Medmenham (1 mile north-west), Hurley (1 mile east), Danesfield (1 mile north), Bockmer End (1 mile north) and Cockpole Green (2 miles south-west). We also work in nearby towns such as Maidenhead (4 miles east), Windsor (10 miles south-east), Boyn Hill (5 miles south-east), North Ascot (11 miles south-east), Cookham (4 miles east) and Furze Platt (4 miles east).
What’s near Frogmill
In Frogmill, that means homes and buildings near Black Boys Inn. For rail, the closest station is Henley-On-Thames station, roughly 3.1 miles west of the centre. Other landmarks nearby include Marlow Community Hospital (3.2 miles north-east) and Marlow Museum (2.7 miles north-east). Open spaces near Frogmill include Hurley Chalk Pit and Weycock Hill.
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
If you do try it yourself, take your time over the 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.
Honest limits
New sealant cannot fix everything, and we will tell you before any work starts. Sealant will not put right:
- Render that is blown, hollow or coming away
- Structural movement, which needs a surveyor or engineer
- Rising or penetrating damp from elsewhere in the wall
If in doubt, ring 0345 464 0079 or email us and we will say what we think before booking.
What we seal
- Brickwork movement joints
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Concrete & block
- Copings & trims
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Keep high-pressure jets off the joints
- Leave the joints unpainted unless we’ve said otherwise
- Keep water from gutters off the wall
- Walk round the building once a year and look at the joints
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Act while the splits are small. Then it’s a straightforward cut-out and reseal with no damage behind it to deal with.
Places near Frogmill
More services for Frogmill
Common questions in Frogmill
Do you cover Frogmill for external mastic?
Yes, Frogmill is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or send us an email and tell us what needs doing.
Will you come out to Frogmill?
Yes, Frogmill is covered. Our work covers London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Should I try DIY first?
That depends on the joint. Work at height, movement joints, fire-rated gaps and large areas are best left to a professional, while a short indoor joint may be within reach.
Where are you based?
We’re a Crawley-based firm, with over 20 years’ experience. We work across South East England, London and Scotland.
Can you do several jobs on one visit?
Yes. Just list everything you need and you will get one quote.
What does external mastic cost?
Size, access and the old material all affect the cost. Ask us for a quote.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all.
Do you work for letting agents?
Yes. We work in homes, commercial premises and hotels, and we are fully insured.
What the job involves on each surface
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
How it works
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours to a few days, depending on the length of joint and the access and we leave things clean and tidy. For a village or hamlet like Frogmill, the journey is planned in advance: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Let us know about parking restrictions
- Mention any leaks or damp you’ve noticed
- Keep children and pets away from the work area
How to get a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is. When it suits you, ring 0345 464 0079 or send us an email.