Greater London · England
External Mastic in Plashet
External mastic in Plashet from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Water getting into walls through failed joints
- Sealant that has lost its bond to the brick or render
- Failed seals between different materials
External mastic for homes and businesses in Plashet
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. If you’re dealing with joints pointed up with cement by mistake and old sealant gone brittle and cracked, we can help, whatever the surface.
Outside work in London starts with access: side passages, upper floors and where to park. For a home in Plashet, tell us how high the joints are and how to reach the back of the building.
There’s a 12-month guarantee on every job, large or small.
- Place
- Plashet (E6, E12, E7)
- Region
- Greater London
- Guarantee
- One year on every job
- Price
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
When something else is needed
In fairness, some problems need a different trade:
- Damp that isn’t coming from the joint
- Cracked brickwork or render that needs a builder or plasterer
- Adding movement joints to masonry that has none
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think before booking.
Surfaces we seal
- Façade panels
- Copings & trims
- Joints between brick and frames
- Brickwork movement joints
- Concrete & block
- Render & cladding joints
Do you need external mastic in Plashet?
If plants are growing out of a joint, the sealant has normally failed or was never there. Dirt and roots then trap moisture in the joint and speed up the damage.
Look out for these signs:
- Rain getting behind render or cladding at a joint
- Gaps where render, brick and frames meet
- Movement joints with cracked, split or missing sealant
- Weeds or debris growing in open joints
If you live in an older home near Church of St Barnabas, the joints between older walls, newer extensions and the roofline need a sealant that can move.
What to look for in a quote
- How the joint is cleaned and prepared
- Whether the sealant suits the joint
- How much experience the applicator has
- What guarantee comes with the work
Can I do it myself?
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it fails, we can still redo it.
What external mastic looks like in Plashet
Historic houses like Valentines Mansion (about 2.2 miles north) are a reminder that the area around Plashet has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. In terraces and conversions, gutters and walls are often shared with the neighbours, so it’s worth agreeing who is responsible before work starts.
Letting a property close to Woodgrange Park station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. Managing a site like Plashet School? Then larger buildings have long runs of movement joint that eventually need resealing.
Plashet is about 2 miles north-east of Plaistow, in Greater London. Homes, rented property, offices and hotels in Plashet can book us for external mastic. Every job comes with our 12-month guarantee. Plashet is one of 764 places in Greater London we cover for external mastic. There’s also a page for London, roughly 7 miles from Plashet.
Work in E6, E12 and E7 works the same way as everywhere else we cover. If you need external mastic at a property on Fry Road, Edith Road and Hilda Road or a nearby road, we can help. We also cover Manor Park (1 mile north-east), Little Ilford (1 mile north-east), Upton Park (1 mile south-west), Upton (1 mile west) and Wallend (1 mile south-east). Larger places within reach include London (7 miles south-west), City of Westminster (9 miles west), Marylebone (9 miles west), Kensington (11 miles west), St Pancras (7 miles west) and Shoreditch (6 miles west).
Local landmarks in Plashet
In Plashet, that means homes and buildings near Monega Primary School, The Overdraft Tavern and West Ham Park and the streets around them. The closest station to Plashet is Woodgrange Park station, about 0.5 miles north. Well-known places in the area include Newham University Hospital (1.5 miles south) and Stratford Centre (2.1 miles west). Green spaces nearby include Old Ford Island and Hollow Pond.
What the job involves on each surface
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out and helps it last.
Joints between dissimilar materials
Wherever two materials meet, they move differently. A flexible sealant bridges the two so the movement is taken up.
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. Typically it 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.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- The faces are brushed clean and primed where the product requires it.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Let us know if you’ve seen damp or leaks
- For indoor joints, keep the area dry beforehand if you can
- Clear the area around the work
Ask for a quote
Want a quote for external mastic? Please call 0345 464 0079 or send us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Advice
For landlords and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.
For anyone letting property in or around Plashet, several properties can be quoted together. Just tell us the addresses and what each one needs, and pictures by email help.
Common questions in Plashet
Can you do external mastic in Plashet?
Yes. We work across London and the South East, and Plashet 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 Woodgrange Park station. Can you help?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will give you a clear price.
What do you put in the joint?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
Will you leave a mess?
No. We work neatly, protect the area around the joints and tidy up afterwards.
Do the sealants smell?
Possibly a little. It fades as the sealant cures.
How much does external mastic cost in Plashet?
Size, access and the old material all affect the cost. Ask us for a quote and we’ll talk you through it.
Is there a guarantee?
Yes. All our work carries our 12-month guarantee.
What is backing rod for?
Backing rod controls the sealant depth and keeps it off the back of the joint. That way it bonds to the two sides only and can stretch.
What happens if it’s left?
Resealing a run of joints in one go is generally better than patching one at a time. Joints of the same age tend to fail together. In a London flat, a failed joint rarely stays your problem alone: water can reach the neighbours below, and gaps in fire-rated joints affect the whole building.
Doing several joints on one visit normally makes better use of the time than several visits. We’ll give you a clear price for the lot.
Why Plashet customers choose us
- Quality sealants from Arbo and Everbuild
- A choice of colours where the product allows
- Fully insured
- We leave the area clean and tidy