Buckinghamshire · England
External Mastic in Lee Gate
Professional external mastic in and around Lee Gate, with every bit of old sealant taken out first.
- Failed seals between different materials
- Damp patches traced to an open external joint
- Leaking joints around cladding and façade panels
The process
There is not much for you to do on the day. Point us to the joints and we’ll get on with it. The work itself takes anything from a few hours to several days, depending on the building, including the tidy-up. In a small place like Lee Gate, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Let us know about parking restrictions
- Keep children and pets away from the work area
- Tell us about any water getting in
Ask for a quote
We quote each job on its own. Simply ring 0345 464 0079 or email us and describe the job.
Advice
How we handle external mastic in Lee Gate
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. We pick a colour that sits well with the wall. We work on concrete & block, façade panels and joints between brick and frames, and the jobs we see most are weeds or debris growing in open joints and brick movement joints where the sealant has split.
External sealant needs dry, clean surfaces, so work around Lee Gate is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Our work is backed for twelve months.
- Where
- Lee Gate (HP16)
- Region
- Buckinghamshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Work for landlords, hotels and businesses
Letting agents often deal with us directly. Send the address, what’s needed and the access arrangements and we’ll give you a quote.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Leave it or put it right?
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last. Around Lee Gate, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Why choose Mr Mastic in Lee Gate
- A sealant colour to suit the surroundings
- We leave the area clean and tidy
- Rated 4.9 stars on Google
- White, clear, grey or another colour, product permitting
Read our cost guide or our reviews.
DIY sealant or a professional job?
Sealing over old silicone is the commonest DIY error. New silicone won’t bond to old, so it peels away and traps moisture behind it. Everything old must be removed first.
Some sealant jobs are within reach of a careful DIYer, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
When to call us in Lee Gate
Many joints fail because they were sealed too deep or with nothing behind them. If the sealant sticks to the back as well as the sides, it cannot stretch and rips as the joint opens.
Look out for these signs:
- Rain getting behind render or cladding at a joint
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
Managing a site like Lee Common Church of England School? Then larger buildings have long runs of movement joint that eventually need resealing.
What to look for in a quote
- What the cure time is
- How the surfaces are prepared before sealing
- What insurance they hold
- Who turns up on the day
Looking after it afterwards
To keep the joints looking good and working properly:
- Check external joints each spring
- Tell anyone working on the walls about the movement joints
- Avoid pressure-washing directly into sealant joints
- Get split or bare joints resealed while the damage is small
Do not let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
Different surfaces, different methods
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that is happened, we rake it out and reseal it properly if the joint can be cleared.
Common questions in Lee Gate
Is Lee Gate within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Can you do external mastic in Lee Gate?
Yes. We work across London and the South East, and Lee Gate is part of that. Just phone 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
What do you need from me for a quote?
A short description and the location. If we need more, we’ll ask.
Do you work for landlords and businesses?
Yes. We work for householders, landlords, letting agents, businesses and hotels.
Will there be a smell?
Some sealants have a smell while they cure, which fades as it sets. Opening a window helps.
Can I do it myself?
Sometimes. The key is preparation: remove all the old material and work on a clean, dry joint. If it does not work out, we can redo it.
Can tenants book the work?
We’re happy to deal with the tenant, landlord or agent. Get your landlord’s agreement first.
How long will you be here?
As a guide, most jobs take a few hours to a few days, depending on the length of joint and the access. Bigger jobs take longer, and we’ll tell you how long to expect.
Outside joints around Lee Gate
London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Cholesbury Manor House (about 2.2 miles north-east) are a reminder that the area around Lee Gate has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
In the older streets around Old Church of St John the Baptist, the joints between older walls, newer extensions and the roofline need a sealant that can move. Rented homes near Wendover station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Lee Gate is about 4 miles north-west of Chesham, in Buckinghamshire. Jobs in Lee Gate get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Lee Gate is one of 263 places in Buckinghamshire where we work for external mastic. For nearby work, see our Reading page (23 miles or so).
Postcode districts we cover here for external mastic: HP16. External mastic is available to properties on Furze Field Lane and Chesham Lane. Close by, we work in Kingsash (1 mile west), Hunt's Green (1 mile south), Wendover Dean (1 mile west), Wendover (2 miles north-west) and Great Missenden (3 miles south). We also work in nearby towns such as Aylesbury (7 miles north-west), High Wycombe (8 miles south), Chesham (4 miles south-east), Marlow (12 miles south), Amersham (6 miles south-east) and Beaconsfield (9 miles south).
Landmarks near Lee Gate
Around Lee Gate, our work takes us to homes and buildings near John Colet School and The Gate Public House. The closest station to Lee Gate is Wendover station, roughly 2.4 miles north-west of the centre. Well-known places in the area include Trenchard Museum (2.6 miles north) and Hawridge Court (3.2 miles east). The countryside around Lee Gate includes Dancersend Nature Reserve and Haddington Hill.