Greater London · England
External Mastic in Poplar
External mastic for Poplar and the surrounding area: careful preparation, the right product and tidy work. Ask us for a quick quote.
- Damp patches traced to an open external joint
- Sealant pulling away from one side of the joint
- Movement joints filled with mortar instead of sealant
Poplar: your questions answered
Do you cover Poplar for external mastic?
Yes. We work across London and the South East, and Poplar is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing.
I let a flat near Canary Wharf station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. Just ring 0345 464 0079 or send us an email with the address and what needs doing, and we’ll give you a clear price.
How much does external mastic cost in Poplar?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. You’ll get a clear quote before any work starts.
What is a movement joint?
Brickwork, render and cladding all move a little, and planned joints take up that movement. The gap is sealed with a flexible sealant over backing rod.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. The sealant is matched to both sides.
Is it worth trying it myself?
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.
When is the sealant fully cured?
Many sealants skin over quickly but take longer to cure fully. We’ll tell you how long to leave the joint.
How long does the job take?
Typically it takes anything from a few hours to several days, depending on the building. Larger jobs naturally take longer, and we will say how long yours will take.
External mastic for homes and businesses in Poplar
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. Typical jobs include weeds or debris growing in open joints and old sealant gone brittle and cracked, on façade panels, render & cladding joints and brickwork movement joints.
Modern London flats rely on sealed movement joints and cladding joints. Older terraces have their own weak points: gutter joints, roofline trims and the joint where an extension meets the original wall, and both kinds of building are found across London.
Every job comes with our one-year guarantee.
- Location
- Poplar (E14, SE16, E22)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
How long the joints last depends on use and care. Here’s what we suggest:
- Keep soil, plants and ivy away from the joints
- Check external joints each spring
- Have failed joints looked at early
- Keep water from gutters off the wall
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
Landlords, agents and businesses in Poplar
Hotels need rooms back in use, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
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.
What external mastic looks like in Poplar
Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Queen's House (about 1.9 miles south) are a reminder that the area around Poplar has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Poplar is in London, so parking needs planning: let us know about parking bays, permits or a driveway. Schools such as Tower Hamlets College are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. Rented homes near Canary Wharf station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Poplar is about 2 miles south-west of Plaistow, in Greater London. Homes, rented property, offices and hotels in Poplar is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Poplar is one of 764 towns and villages in Greater London where we work for external mastic.
Postcode districts we cover here for external mastic: E14, SE16 and E22. If you need external mastic at a property on Market Way, Castor Lane and Dockyard Lane or anywhere close by, we can help. Poplar sits on or near the A102 and A1261, so getting to you is simple. We also cover the places around Poplar: London Docklands (1 mile south), Canary Wharf (1 mile south-west), Heron Quays (1 mile south-west), Coldharbour (1 mile south-east) and Blackwall (1 mile east). Further out, we also cover London (3 miles west), City of Westminster (6 miles west), Marylebone (6 miles west), Kensington (8 miles west), St Pancras (5 miles west) and Shoreditch (3 miles north-west).
What’s near Poplar
In Poplar, that means homes and buildings near Bartlett Park, Langdon Park Secondary School and Our Lady and St Joseph Catholic Primary School. Poplar has its own railway station: Canary Wharf station. Nearby you’ll also find Museum of the Book (0.8 miles north-west) and Poplar Hospital (0.6 miles north-east). Not far away are Lavender Pond and St. James's Park Lake.
When it isn’t the sealant
In fairness, some problems need a different trade:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cracks in the bricks or render themselves, away from the joints
- Subsidence or other structural problems
Not sure which it is? You can phone 0345 464 0079 or send us an email and we will tell you honestly.
Joints and surfaces we work on
- Concrete & block
- Copings & trims
- Render & cladding joints
- Brickwork movement joints
- Joints between brick and frames
- Façade panels
Why it’s worth doing now in Poplar
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. Damp from a failed joint spreads quietly in older London brickwork and timber, and once it shows in Poplar, the repair is bigger than a sealant job.
Rather than a set price list, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Why book with us
- Rated 4.9 stars on Google
- A sealant colour to suit the surroundings
- We never seal over old sealant
- Neat joints and a tidy finish
See our cost guide or our reviews.
The process
When we arrive, we look over the joints with you first, so there are no surprises. We protect the surfaces around the joints before any work begins. The work normally takes anything from a few hours to several days, depending on the building. Many London jobs are in flats, so we come ready for stairs, narrow hallways and shared entrances. If the building has a concierge, managing agent or access rules, tell us when you book.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Getting ready for the visit
- Plan for the work area to be out of bounds to pets and children
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
Get a quote
It all starts with a short chat. Describe the problem, the location and the size of the job. When it suits you, ring 0345 464 0079 or send us an email.
Read more
What the job involves on each surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. The movement joint takes that up, so its sealant has to stay flexible.
What else we do in Poplar
How we quote for external mastic
We do not publish a price list, because no two jobs are the same. What we look at:
- Access and height
- Whether there’s mould to deal with
- How many areas need sealing
- The number and length of the joints
What you pay reflects the work, not a rough estimate. That’s why we ask a few questions first and send you a clear quote before we start.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- The address or postcode of the job
- How we’d reach the joints
- How many joints, rooms or windows are involved
- Any previous sealing or DIY work
Call for a quick quote, or send an email if you’d rather. Describe what needs sealing and we’ll talk you through the work and send you a clear quote.