Greater London · England
Nag's Head External Mastic
We cover Nag's Head for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
- Weeds or debris growing in open joints
Looking after it afterwards
A little care helps the new joints last. Our advice:
- Never let anyone fill a movement joint with mortar
- Leave the joints unpainted unless we have said otherwise
- Check external joints each spring
- Wash walls gently around the sealant
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Leaks behind façade panels and render often go unseen. When it finally shows inside, the joint may have been open for years so early resealing is worth it.
How we handle external mastic in Nag's Head
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 concrete & block, render & cladding joints and brickwork movement joints, and the jobs we see most are gaps where render, brick and frames meet and old sealant gone brittle and cracked.
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. In a converted house in Nag's Head, it’s worth checking who is responsible for the outside before booking.
Big or small, it’s backed by our 12-month guarantee in Nag's Head and across Greater London.
- Place
- Nag's Head (N7, N19, N4)
- Region
- Greater London
- Cover
- 12 months on all our work
- Price
- A clear quote up front
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod.
Why deal with it now?
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. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Nag's Head, the repair is bigger than a sealant job.
There are no prices on our website, because each job is priced on what it involves. For a quick quote, please ring 0345 464 0079 or email us and we will talk you through it.
Why us?
- Every job guaranteed for a year
- A choice of colours where the product allows
- You choose the colour before work begins
- Experience in homes, commercial sites and hotels
Take a look at what affects the cost and our reviews.
What external mastic looks like in Nag's Head
In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
As a London address, Nag's Head can be tricky for parking: tell us about permits, visitor bays or off-street space when you book. Managing a site like Grafton Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Nag's Head is about 2 miles north-west of Hoxton, in Greater London. Jobs in Nag's Head get the same care as everywhere else we work: old sealant removed completely, careful preparation and a one-year guarantee. Our Greater London coverage runs to 764 places, and Nag's Head is one of them.
Jobs for external mastic in N7, N19 and N4 is quoted and booked the same way as anywhere else. If you need external mastic at a property on Penn Road, Tabley Road and Lowman Road or anywhere close by, our applicators can take on the job. Other places close to Nag's Head include Holloway (1 mile south), Lower Holloway (1 mile south), Tufnell Park (1 mile west), Upper Holloway (1 mile north-west) and Barnsbury (1 mile south). Larger places within reach include London (4 miles south), City of Westminster (3 miles south-west), Marylebone (3 miles south-west), Kensington (5 miles south-west), Shoreditch (3 miles south-east) and Walthamstow (4 miles north-east).
Near you in Nag's Head
We work in homes and buildings around Vaughan Williams Memorial Library, Whittington Park and The Coronet pub and the streets around them. You’ll also find Beacon High (0.6 miles south-west) and Musical Theatre Academy (0.8 miles south-east). The closest station to Nag's Head is Drayton Park station, about 0.6 miles south-east of the centre. Nearby you’ll also find Arsenal Football Club Museum (under half a mile east) and Royal Northern Hospital (within half a mile north-west). For a walk, there’s St. James's Park Lake and Dartmouth Park Hill.
Quotes for external mastic in Nag's Head
We don’t publish a price list, because no two jobs are the same. The quote depends on:
- How easy the joints are to reach
- The number of rooms or windows
- How much there is to do
- When we can work, for business premises
What it costs depends on the amount of work, how hard the old material is to remove and access to the work. We give a clear quote before we start, so you know where you stand.
Asking for a quote
To make quoting easier, please include:
- Any access issues, like height or stairs
- The type of property
- Photos by email, if that is easy
- If someone has resealed it before
Every job is quoted individually, so the first step is telling us about yours. Simply call 0345 464 0079 or drop us an email and describe the job and send pictures if you have them.
Can I do it myself?
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Nag's Head: your questions answered
Is parking a problem for a job in Nag's Head?
It can be, so it helps to tell us about permits, visitor bays or off-street space when you book. The visit is then planned around what’s available.
Do you cover Nag's Head for external mastic?
Yes. Our work covers London and the South East, and Nag's Head is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job, and we’ll send you a clear quote.
Can tenants book the work?
We can work for tenants, landlords or agents. Get your landlord’s agreement first.
Will it make a mess?
Tidy work is part of the job. Nearby surfaces are protected.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking, and it should be sealed with a flexible sealant.
How much does external mastic cost in Nag's Head?
It depends on the job, so we quote each one individually. For a quick quote, call 0345 464 0079 or email us and let us know what needs doing and where.
Do I have to be there?
It depends on the job. For work indoors, someone needs to let us in.
Will the new joint stand out?
The sealant colour is picked to suit the wall, so the joint sits quietly in the wall. Exterior sealants come in a good range of colours.
The process
Before we leave, we go over the finished joints with you. The work normally takes a few hours to a few days, depending on the length of joint and the access, depending on the size of the job. In a London area like Nag's Head, the main things to plan are parking and access: tell us about permits, visitor bays or off-street space, which floor we are working on and whether there’s a lift.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- On commercial sites, let us know about site rules
- Plan for the work area to be out of bounds to pets and children
- Move anything stored near the joints
Get a quote
For a quote, ring 0345 464 0079 or send us an email with the location and a short description of the problem. You’ll have a clear quote before we start.
Read more
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Other services in Nag's Head
Signs you need external mastic in Nag's Head
The wrong product in a moving joint is a classic cause. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Signs it’s time to call us include:
- Panel joints letting water in
- Water getting into walls through failed joints
- Movement joints filled with mortar instead of sealant
- Sealant that has lost its bond to the brick or render
For an older house near a landmark such as St Joseph and St Padarn's Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- What guarantee comes with the work
- Who turns up on the day
- Which sealant they’ll use, and why
- How long to leave it before use