Milton Keynes · England
Olney External Mastic
External mastic in Olney from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant that has lost its bond to the brick or render
- Plants rooting in failed movement joints
- Movement joints with cracked, split or missing sealant
Aftercare tips
A little care helps the new joints last. Our advice:
- Clear growth from the base of walls and joints
- Show decorators and builders where the movement joints are
- Wash walls gently around the sealant
- Deal with leaking gutters that soak the joints below
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage which cost more to put right than the joint.
About our external mastic in Olney
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, so once it splits or hardens, the joint stops working and water gets in. We work on brickwork movement joints, joints between brick and frames and render & cladding joints, and common reasons people get in touch are water getting into walls through failed joints and hard, crazed mastic that has stopped moving.
Houses in smaller places like Olney can stand more in the open than those in a built-up town, so exposed walls and rooflines take more wind-driven rain. That is where gutter joints and wall joints tend to fail first.
A 12-month guarantee comes as standard, so you’re covered after we have gone.
- Location
- Olney (MK46)
- Wider area
- Milton Keynes
- Cover
- A year, on every job
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
Running new sealant over the old bead rarely lasts. New sealant doesn’t bond well to old, weathered sealant, so we always take the old sealant out. In an older home around Olney, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Doing several joints on one visit usually makes better use of the time than several visits. You will get one clear quote for the whole job.
Why book with us
- Sealant colour chosen to suit
- We agree the colour with you first
- 4.9 on Google from 180+ five-star reviews
- Every job guaranteed for a year
Take a look at how sealant jobs are priced or our reviews.
Landlords, agents and businesses in Olney
If you manage several properties in or around Olney, jobs at different addresses can be quoted together. Just tell us the addresses and what each one needs.
In hotels, rooms out of use cost money, so we plan the work room by room. We’ve worked in hotels as well as homes and businesses.
Towns and villages near Olney
What else we do in Olney
How the visit works
The work is kept neat and contained to the area we are working on, so you can carry on as normal. Expect the work to take anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. In a smaller place like Olney, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Mention if the joints have been sealed before
- Mention any tricky access
- Move anything stored near the joints
Get a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is, and we’ll explain how we’d tackle it. Whenever you’re ready, phone 0345 464 0079 or send us an email.
Advice
When to call us in Olney
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
The problems people generally mention when they call are:
- Moss and dirt in joints with no sealant left
- Leaking joints around cladding and façade panels
- Damp patches traced to an open external joint
- Gaps where render, brick and frames meet
If you look after a building such as Olney Middle School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
What your quote should include
- What preparation is included
- What the quote includes, VAT included or not
- What happens if the job turns out different
- Whether they seal over old material or remove it
How the job changes by surface
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. We prime where the sealant needs it.
Copings and trims
Metal and stone copings both move with temperature, so the joints need a sealant that stays flexible in all weathers.
FAQs for Olney
What guarantee comes with external mastic in Olney?
All our work, in Olney and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Will you come out to Olney?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
What’s an expansion joint in brickwork?
Most straight vertical gaps in brickwork are movement joints. It lets the bricks expand without cracking and needs a flexible seal, not mortar.
How much does external mastic cost in Olney?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote.
Do you work at height?
Each building is different. Send us photos and a rough idea of the height, and we will confirm what access is needed.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Why do you put foam in the joint first?
That’s backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
What information do you need?
Only a few details: where it is, what you’ve noticed and how we reach it. Then call 0345 464 0079 or send us an email.
Should I try it myself first?
If you’ve already had a go yourself, that’s fine. We remove it and do the joint properly, so tell us about it when you ask for a quote.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas call for the right materials, safe access and experience.
Walls and rooflines in Olney
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. With historic houses such as Turvey Abbey (about 3.7 miles east) nearby, there’s older building stock in the area around Olney as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
For an older house near a landmark such as Church of Saints Peter and Paul, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Olney is about 9 miles north of Milton Keynes, in Milton Keynes. For external mastic in and around Olney, please ring 0345 464 0079 or drop us an email for a quick quote. We cover Milton Keynes from our Crawley base, Olney included. Our Milton Keynes coverage runs to 73 places, and Olney is one of them. You can also see our page for Oxford, roughly 36 miles from Olney.
All of MK46 is covered for external mastic. Local streets include High Street, Market Place and High Street South. You will find Olney on the A509 and B565, which makes it straightforward to reach. Nearby, we also carry out external mastic in Emberton (1 mile south), Weston Underwood (1 mile south-west), Ravenstone (2 miles west), Sherington (3 miles south) and Tyringham (3 miles south-west). Within a short drive, we also cover Milton Keynes (9 miles south), Bletchley (11 miles south), Newport Pagnell (5 miles south), Bletchley and Fenny Stratford (11 miles south), Furzton (11 miles south) and Whitehouse (10 miles south-west). Olney is one of the larger places we cover in Milton Keynes.
What’s near Olney
Typical jobs here are in homes near Two Brewers Public House. A little further out are Lavendon (2.2 miles north-east).