Milton Keynes · England
External Mastic in Lavendon
Problem with your movement joints in Lavendon? We remove the old material, prepare the joints and seal them properly.
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
- Joints with sealant missing in places
Surface by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. Both surfaces are cleaned and primed as the product requires.
Cladding and façade panels
Panel systems often rely on sealant between and around the panels. We reseal them with a sealant suited to the panel material.
How we handle external mastic in Lavendon
Low-level joints can normally be done from the ground. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what’s needed to reach them safely. We work on façade panels, render & cladding joints and joints between brick and frames, and the jobs we see most are rain getting behind render or cladding at a joint and panel joints letting water in.
Outside joints can only be sealed when they’re dry, so work in Lavendon is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
Our work is backed for twelve months, and the guarantee is the same wherever you are.
- Location
- Lavendon (MK46)
- Wider area
- Milton Keynes
- Guarantee
- A year, on every job
- Quotes
- A clear price before we start
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Lavendon questions
Do you cover Lavendon for external mastic?
Yes. We work across London and the South East, and Lavendon is part of that. Just call 0345 464 0079 or drop us an email with a few details of the job, and we’ll give you a clear price.
What guarantee comes with external mastic in Lavendon?
All our work, in Lavendon and everywhere else, comes with a 12-month guarantee. We are fully insured, and an ARBOMaster approved applicator.
Do you take out the old sealant first?
Yes, every time. New silicone doesn’t stick to old silicone, so the joint is cleaned back first.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
How much does external mastic cost in Lavendon?
We do not publish prices, because the cost depends on the job: its size, the old material, access and the product needed. You will get a clear quote before we start.
Can I add another job to the visit?
Yes. Tell us about everything you’d like done and we will quote it together.
How long does external mastic last?
There’s no fixed answer: sunny, exposed elevations and busy joints wear faster. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.
Can you seal joints between two different materials?
Yes. Different materials move at different rates, so the joint between them must be flexible. We choose one that suits both surfaces.
Work for landlords, hotels and businesses
Housing providers, facilities teams and property managers book us too in Lavendon and across Milton Keynes. Several sites can go on one quote, and we’re fully insured for the work.
We work for landlords and agents as well as householders. Resealing between tenancies keeps a property looking cared for.
External mastic in Lavendon: local notes
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Turvey Abbey (about 2 miles east) are a reminder that the area around Lavendon 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.
Homes close to Church of St Michael include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Lavendon is about 7 miles north-east of Newport Pagnell, in Milton Keynes. Lavendon gets the same service as everywhere we cover: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 73 towns and villages across Milton Keynes, from the larger towns to small villages. Our Oxford page covers work nearby (38 miles or so).
Work in MK46 works the same way as everywhere else we cover. That includes homes and businesses on High Street, Rectory Orchard and Orchard Walk and the roads around them. We also cover Cold Brayfield (1 mile south-east) and Clifton Reynes (2 miles south-west). Further out, we also cover Milton Keynes (10 miles south-west), Bletchley (13 miles south), Newport Pagnell (7 miles south-west), Bletchley and Fenny Stratford (13 miles south), Furzton (12 miles south) and Whitehouse (12 miles south-west).
Near you in Lavendon
Other landmarks nearby include Odell Castle (4.1 miles north-east). Open spaces near Lavendon include Pavenham Osier Beds.
When something else is needed
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Damp that isn’t coming from the joint
- Adding movement joints to masonry that has none
- Cracking across the wall rather than at a joint
If you are not sure, just phone 0345 464 0079 or drop us an email and we’ll give you a straight answer.
What we seal
- Concrete & block
- Copings & trims
- Façade panels
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
DIY sealant or a professional job?
A careful DIYer can reseal a simple joint, such as a straightforward joint indoors. Where it goes wrong is sealing over the old bead, working on a wet joint or overloading the gap.
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.
When to call us in Lavendon
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. All of that ends up in the joint sealant.
Look out for these signs:
- Sealant that has lost its bond to the brick or render
- Water getting into walls through failed joints
- Brick movement joints where the sealant has split
- Hard, crazed mastic that has stopped moving
For site and facilities teams at buildings such as Lavendon School, larger buildings have long runs of movement joint that eventually need resealing.
What your quote should include
- Whether all the old sealant comes out first
- When the joint can take water or movement
- Whether they’re fully insured
- What happens if they find a problem under the old sealant
How to look after the new joints
Good habits help new joints last longer. A few tips:
- Walk round the building once a year and look at the joints
- Tell anyone working on the walls about the movement joints
- Keep water from gutters off the wall
- Keep movement joints as flexible joints, not mortar
Have a quick look at the joints each spring. Watch for splits, edges coming away or growth in the joint.
Act while the splits are small. At that stage it’s a simple cut out and reseal.
How it works
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. In total, it usually takes a few hours to a few days, depending on the length of joint and the access. Somewhere as small as Lavendon, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
How to prepare
- Mention any parking rules near the property
- Clear items away from the joints we are working on
- On commercial sites, let us know about site rules
Get a quote
Want a quote for external mastic? Please phone 0345 464 0079 or email us with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.