Greater London · England
External Mastic in Moorhouse Bank
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Moorhouse Bank and across Greater London. Fully insured, ARBOMaster approved and guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Movement joints filled with mortar instead of sealant
- Sealant pulling away from one side of the joint
Moorhouse Bank questions
Can you help a landlord with a rental near Hurst Green station?
Yes, landlords and agents are among the people we work for. Just call 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
Can parking be tricky for a visit in Moorhouse Bank?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
Do you have insurance?
Yes. Mr Mastic is fully insured, with over 20 years’ experience in sealant work.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Will you leave a mess?
Not at all. The area is protected while we work and cleaned up afterwards.
Do you do commercial work?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
Does someone need to be in?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that normally means someone at home.
What colours does the sealant come in?
The sealant colour is picked to suit the wall, so the joint sits quietly in the wall. There’s a wide choice of exterior colours.
External mastic in Moorhouse Bank
Low-level joints can normally be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. If you are dealing with failed sealant between panels on a façade and movement joints with cracked, split or missing sealant, we can put it right, whatever the surface.
Working on the outside of a London home means planning access: shared paths, upper floors and parking. For a home in Moorhouse Bank, tell us how high the joints are and how to reach the back of the building.
A 12-month guarantee comes as standard, so you’re covered after we have gone.
- Place
- Moorhouse Bank (TN16)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quote
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When to call us in Moorhouse Bank
Some movement joints have been pointed up with mortar. The joint can’t move, so the wall cracks somewhere else instead.
These are the problems we’re asked about most:
- Damp patches traced to an open external joint
- Movement joints with cracked, split or missing sealant
- Hard, crazed mastic that has stopped moving
- Panel joints letting water in
Rented homes near Hurst Green station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- What insurance they hold
- What preparation is included
- Who does the work, and how experienced they are
- How long to leave it before use
Outside joints around Moorhouse Bank
Historic houses like Quebec House (about 1.3 miles east) are a reminder that the area around Moorhouse Bank has older buildings as well as new. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth. London terraces and converted houses often share gutters, downpipes and walls, so check who is responsible for the outside before booking.
Moorhouse Bank is in London, so parking needs planning: let us know about parking bays, permits or a driveway. If you live in an older home near St Andrew's, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Moorhouse Bank is about 6 miles west of Sevenoaks, in Greater London. Anywhere in TN16, our applicators can take on external mastic. Across Greater London, we cover 764 places, Moorhouse Bank among them. Crawley is on our list too, about 15 miles from Moorhouse Bank.
We cover every part of the TN16 postcode area for external mastic and the streets around it. We also cover The Chart (1 mile south-west), Goodley Stock (1 mile south-east), Westerham (1 mile north-east), Pains-Hill (1 mile south-west) and Titsey (2 miles north-west). Within a short drive, we also cover Orpington (9 miles north), New Cross (15 miles north), Thornton Heath (12 miles north-west), Croydon (10 miles north-west), East Dulwich (15 miles north) and Streatham (14 miles north-west).
Around Moorhouse Bank
Typical jobs here are in homes near The Wolfe Public House. Moorhouse Bank’s nearest station is Hurst Green station, about 2.2 miles south-west. Other landmarks nearby include Tandridge Priory (1 mile south-west). The countryside around Moorhouse Bank includes Betsom's Hill and Dryhill Nature Reserve.
How the visit works
The work is kept neat and contained to the area we’re working on. Expect the work to take a few hours to a few days, depending on the length of joint and the access, and we explain the cure time before we leave. In Moorhouse Bank, as in most of London, parking needs a little planning. It helps if you can point us to a visitor permit or a bay close to the door.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- The old mastic and anything lodged in the joint is removed.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Before we arrive
- Tell us if parking is tricky
- Tell us about any previous sealing or DIY attempts
- For indoor joints, keep the area dry beforehand if you can
Ask for a quote
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we will explain what’s involved.
Related advice
Aftercare tips
A little care helps the new joints last. Our advice:
- Never let anyone fill a movement joint with mortar
- Show decorators and builders where the movement joints are
- Walk round the building once a year and look at the joints
- Wash walls gently around the sealant
Avoid pressure-washing straight into the joints. High-pressure water can lift the edges.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years.
DIY versus a professional finish
The difference is mostly in the preparation and the product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Not every job suits DIY: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
What affects the cost of external mastic
The quote reflects the job in front of us. We take into account:
- Working hours on commercial sites
- Any mould that needs treating
- Whether old sealant or filler has to be cut out
- The product the joint needs
Instead of a standard rate, we price the job in front of us: how many joints, what’s in them now and how we reach them. The price is agreed before we begin.
Helping us quote
To help us quote quickly, let us know:
- The problem you’ve noticed
- The address or postcode of the job
- Whether it’s a home or a business
- Roughly how big the job is
If you are in Moorhouse Bank and need external mastic, ring 0345 464 0079 or email us. Tell us what the problem is and where, and you’ll get a clear quote before work begins.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Whether it’s one flat or a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Nearby places to Moorhouse Bank
Also in Moorhouse Bank
Different surfaces, different methods
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. They’re resealed over backing rod with a low-modulus sealant coloured to suit the wall.
Copings and trims
Metal and stone copings both move with temperature, so a flexible sealant suits them best in all weathers.