Greater London · England
Woodside Park External Mastic
Movement joints in Woodside Park need attention? We cut out the old, prepare the joints and apply the right sealant, and the work is guaranteed for a year.
- Brick movement joints where the sealant has split
- Joints pointed up with cement by mistake
- Joints where the bead has come unstuck
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, and the work is guaranteed for a year.
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
External mastic for homes and businesses in Woodside Park
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible sealant bridges the two. If you have weeds or debris growing in open joints and rigid filler in a joint that should flex, we can help, whatever the surface.
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.
You get a 12-month guarantee, the same in Woodside Park as everywhere else we work.
- Location
- Woodside Park (N12, N3, N20)
- Region
- Greater London
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
Outside joints around Woodside Park
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Heath Hall (about 3 miles south) are a reminder that the area around Woodside Park 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.
Schools such as Northside Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. As a London address, Woodside Park can be tricky for parking: let us know about parking bays, permits or a driveway.
Woodside Park is about 1 mile north of Finchley, in Greater London. Homes, rented property, offices and hotels in Woodside Park is covered for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Woodside Park is one of 764 places in Greater London where we work. There’s also a page for London, about 9 miles away.
All of N12, N3 and N20 is covered for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on High Road, Lodge Lane and Percy Road or anywhere close by, we can help. If you are just outside Woodside Park, we cover North Finchley (1 mile east), Oakleigh Park (1 mile north-east), Whetstone (1 mile north-east), Church End (1 mile south) and Finchley (1 mile south). Further out, we also cover London (9 miles south-east), City of Westminster (7 miles south), Marylebone (7 miles south), Kensington (8 miles south), St Pancras (7 miles south-east) and Shoreditch (8 miles south-east).
Near you in Woodside Park
Around Woodside Park, our work takes us to homes and buildings near Francis Skaryna Belarusian Library and Museum, St Michael's Catholic Grammar School and Woodhouse College and the streets around them. You will also find Malt & Hops pub (within half a mile north-east) and Swan Lane Open Space (0.6 miles north-east). For rail, the closest station is Oakleigh Park station, about 1.6 miles north-east. Well-known places in the area include Grand Arcade (less than half a mile south-east) and Finchley Memorial Hospital (0.9 miles south-east). The countryside around Woodside Park includes Darland's Lake and Highgate Hill.
Leave it or put it right?
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. A stiffer product can damage the joint edge as it fails. In older London homes, water behind a failed joint soaks into brick and timber without much sign, and by the time it shows on a wall or ceiling in Woodside Park, the repair is bigger than the sealant job would have been.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, call 0345 464 0079 or email us for an honest opinion and a quote.
What you get with us
- White, clear, grey or coloured to suit, where the product allows
- Tidy, careful work
- Sanitary silicone with an anti-fungal additive in wet areas
- Over 20 years’ experience
Woodside Park: your questions answered
Is parking an issue for external mastic in Woodside Park?
In much of London, parking needs planning: a visitor permit or a bay close to the door helps a lot.
I let a flat near Oakleigh Park station. Can you help?
Yes, we work for landlords and letting agents. Just ring 0345 464 0079 or drop us an email and tell us about the property, and we will send you a clear quote.
What is a movement joint?
Most straight vertical gaps in brickwork are movement joints. It gives the wall room to move.
Where is Mr Mastic based?
Mr Mastic is based in Crawley. We cover Woodside Park and the rest of Greater London, along with the rest of our area.
Do you seal joints where cladding meets other materials?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides.
Why do you put foam in the joint first?
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.
Can I add another job to the visit?
Yes. Just list everything you need.
Will the new joint stand out?
We aim for a joint that suits the wall rather than one that jumps out. We’ll talk through colour options before work begins, matched as closely as the range allows.
Surface by surface
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible.
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. Priming is done where the sealant calls for it.
When something else is needed
Before booking, it’s worth knowing the limits too:
- Movement that is more than a sealant joint can take
- Walls that need new movement joints cut into them
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If you’re not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Joints and surfaces we work on
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Concrete & block
- Brickwork movement joints
- Façade panels
Common problems we fix in Woodside Park
Every building moves. Brickwork grows a little over the years, blockwork and concrete shrink, and all of it moves with heat and moisture. The sealant in the movement joints takes that strain.
These are the problems we are asked about most:
- Weathered mastic that no longer stretches
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
- Movement joints with cracked, split or missing sealant
Rented homes near Oakleigh Park station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Before you book anyone
- What product goes in the joint
- What happens if they find a problem under the old sealant
- Is VAT in the price?
- How much experience the applicator has
Towns and villages near Woodside Park
What else we do in Woodside Park
What happens on the day
You don’t need to clear the whole room or building before we come, just the space around the work. We protect the rest, and the job takes a few hours for a handful of joints, longer for a whole elevation for a typical job. For a job in Woodside Park, 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 inspect the joints and agree which need resealing and how they’ll be reached.
- 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.
- 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.
Preparing for the visit
- Try not to wet indoor joints just before the visit
- Clear items away from the joints we’re working on
- Tell us about any previous sealing or DIY attempts
Getting a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you are ready, ring 0345 464 0079 or send us an email.
Related advice
Looking after it afterwards
Good habits help new joints last longer. A few tips:
- Point out the joints to other trades
- Wash walls gently around the sealant
- Get split or bare joints resealed while the damage is small
- Ask before painting over external sealant
Keep the joints clear of soil, plants and climbing growth. Anything that holds water against the joint wears it out sooner.
Act while the splits are small. At that stage it’s a simple cut out and reseal before water has had years to get in.