Greater London · England
External Mastic in Aldwych
Sealing brickwork movement joints, render, cladding and façade joints for Aldwych, backed by a one-year guarantee. Ask us for a quote.
- Joints with sealant missing in places
- Weeds or debris growing in open joints
- Water getting into walls through failed joints
About our external mastic in Aldwych
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant. Common call-outs are for brick movement joints where the sealant has split and sealant pulling away from one side of the joint, on joints between brick and frames, concrete & block and copings & trims.
London’s terraces and conversions often share walls, gutters and downpipes with their neighbours, so one failed joint can cause damp for more than one household. For a flat in Aldwych, check the lease for who looks after the outside.
A one-year guarantee comes as standard.
- Place
- Aldwych (W1D, WC2H, W1F)
- Region
- Greater London
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Landlords, agents and businesses in Aldwych
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.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
Why it’s worth doing now in Aldwych
Running new sealant over the old bead rarely lasts. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. In London conversions, one flat’s bathroom is often above another flat’s ceiling, so a small leak from tired sealant can mean a neighbour’s ceiling and a lot of disruption. Putting it right early is much less trouble.
What it costs depends on the size of the job, how hard the old material is to remove and access to the work. We give a clear quote before work begins, so you know where you stand.
Why choose Mr Mastic in Aldwych
- Neat joints and a tidy finish
- We agree the colour with you first
- Sealant colour chosen to suit
- Over 20 years’ experience
Read our cost guide or our reviews.
Aldwych questions
Can parking be tricky for a visit in Aldwych?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot, so mention what’s available when you book.
Can you help a landlord with a rental near London Charing Cross station?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just phone 0345 464 0079 or drop us an email with the address and what needs doing, and we will give you a clear quote.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
Where are you based?
We are based in Crawley, West Sussex, and we work across South East England, London and Scotland.
What should I tell you?
Let us know what needs doing and where, with photos by email if possible. We’ll ask anything else we need to know.
Is there any odour?
It depends on the product. Some products have a noticeable smell, others very little.
Do you guarantee your work?
Yes: twelve months. If there’s a problem with our work in that time, tell us and we’ll put it right.
Do you seal joints where cladding meets other materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. We choose one that suits both surfaces.
How it works
On the day, we start by going over the job with you, so you know exactly what we’re doing. We protect the surfaces around the joints before any work begins. Most jobs take anything from a few hours to several days, depending on the building. For a job in Aldwych, parking and access are the things to plan: let us know about parking, the floor we will be working on and any lift or shared entrance.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- The old mastic and anything lodged in the joint is removed.
- We clean both faces of the joint and prime them where the product calls for it.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Getting ready for the visit
- Mention any sign-in or site rules at work premises
- Mention any tricky access
- Plan for the work area to be out of bounds to pets and children
Ask for a quote
For a quick quote, get us on the phone, or email us if that’s easier. Tell us about the joints that need doing and we’ll talk you through the work before giving you a price.
Read more
Also near Aldwych
Also in Aldwych
What the job involves on each surface
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. Each joint gets a sealant that suits the panel and its movement.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so the sealant in it must stay soft and stretchy.
Do you need external mastic in Aldwych?
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall.
The most common problems we see are:
- Moss and dirt in joints with no sealant left
- Cracked joints where brick meets render or frames
- Rigid filler in a joint that should flex
- Joints where the bead has come unstuck
Homes close to St Mary le Strand include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- How the colour is chosen
- Is the old sealant removed completely?
- Whether the sealant suits the joint
- How the surfaces are prepared before sealing
Outside joints around Aldwych
In terraces and conversions, gutters and walls are often shared with the neighbours, so check who is responsible for the outside before booking. The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
For landlords with property near London Charing Cross station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. As a London address, Aldwych can be tricky for parking: tell us about permits, visitor bays or off-street space when you book.
Aldwych is about 1 mile north-west of London, in Greater London. Homes, rented property, offices and hotels in Aldwych is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Across Greater London, we cover 764 places, Aldwych among them.
Here we cover the W1D, WC2H and W1F postcode area for external mastic. If you need external mastic at a property on Shoe Lane, Drury Lane and New Square or a nearby road, our applicators can take on the job. Being close to the A4 and A301, Aldwych is easy for our applicators to reach. We also cover the places around Aldwych: Clare Market (1 mile north), Covent Garden (1 mile west), Temple Bar (1 mile east), Temple (1 mile east) and Adelphi (1 mile south-west). Within a short drive, we also cover Kensington (4 miles west), Walthamstow (6 miles north-east), Hampstead (4 miles north-west), Ruislip (13 miles west), Stockwell (3 miles south) and Orpington (13 miles south-east).
Landmarks near Aldwych
In Aldwych, that means homes and buildings near Ye Old White Horse pub, Lincoln's Inn Fields and Mercers' School, among other places. Nearby too are LSE Shaw Library (under half a mile north-east) and London Nautical School (0.6 miles south-east). Aldwych’s nearest station is London Charing Cross station, roughly 0.5 miles south-west. A little further out are Montfichet's Tower (0.7 miles east) and Gabriel's Wharf (0.5 miles south-east). Green spaces nearby include Barnsbury Wood and Ludgate Hill.
What sealant work cannot fix
We’ll always be straight with you, so here’s what sealant can’t fix:
- Damp that is not coming from the joint
- Walls that need new movement joints cut into them
- Cracking across the wall rather than at a joint
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Surfaces we seal
- Copings & trims
- Render & cladding joints
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
Keeping the joints in good condition
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Deal with leaking gutters that soak the joints below
- Avoid pressure-washing directly into sealant joints
- Look over the joints every year, ideally after winter
- Keep soil, plants and ivy away from the joints
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.