Milton Keynes · England
Astwood External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Astwood. ARBOMaster approved applicators, fully insured, with a 12-month guarantee.
- Water getting into walls through failed joints
- Leaking joints around cladding and façade panels
- Joints where the bead has come unstuck
External mastic in Astwood
Low-level joints can generally be done from the ground. For joints higher up, give us some details of the building and we’ll confirm what’s needed to reach them safely. Common call-outs are for joints with sealant missing in places and joints where the bead has come unstuck, on façade panels, joints between brick and frames and concrete & block.
Somewhere as small as Astwood, homes and farm buildings often face open ground, where walls and rooflines take the weather head on. Gutter joints and wall joints there need a sealant that can flex and stay put.
The work is guaranteed for twelve months. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Location
- Astwood (MK16)
- Region
- Milton Keynes
- Guarantee
- A year, on every job
- Quote
- A clear price before we start
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
Surface by surface
Cladding and façade panels
If the façade has a specified sealant, that is what we use, or one the system allows. Send us any details you have about the façade.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out and helps it last.
Towns and villages near Astwood
Also in Astwood
Can I do it myself?
A DIY attempt doesn’t rule out a professional job. We cut it out and start again.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is matched to the joint and its conditions, and the work is guaranteed for a year.
Walls and rooflines in Astwood
Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Turvey Abbey (about 3.3 miles north) are a reminder that the area around Astwood 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.
For landlords with property near Kempston Hardwick station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Astwood is in Milton Keynes. For external mastic in and around Astwood, it’s easy to get a quote: please call 0345 464 0079 or send us an email. We’re based in Crawley and cover Milton Keynes, Astwood included. Across Milton Keynes, we cover 73 places, and Astwood is one of them. Oxford is on our list too, around 37 miles away.
We cover every part of MK16 for external mastic and the streets around it. That includes homes and businesses on Lewens Croft, Cranfield Road and Main Road. We also cover the places around Astwood: Chicheley (3 miles west), Cold Brayfield (4 miles north-west), Clifton Reynes (4 miles north-west) and Lavendon (5 miles north-west). We also work in nearby towns such as Milton Keynes (9 miles south-west), Bletchley (10 miles south-west), Newport Pagnell (6 miles south-west), Bletchley and Fenny Stratford (10 miles south-west), Furzton (10 miles south-west) and Whitehouse (10 miles south-west).
Around Astwood
For rail, the closest station is Kempston Hardwick station, roughly 4.8 miles east of the centre. Nearby you’ll also find Bedford Hospital (5.9 miles east) and Lavendon (4.7 miles north-west). Open spaces near Astwood include Stewartby Lake.
What happens if it’s left?
A properly done movement joint is an even line in a colour that suits the wall. A hurried job with smeared edges and no backing looks worse and fails sooner. Around Astwood, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint normally makes the job bigger, not smaller, as water and mould keep getting in. If you’re not sure whether it needs doing, ring 0345 464 0079 or drop us an email for an honest opinion and a quote.
Why choose Mr Mastic in Astwood
- Neat joints and a tidy finish
- Over 20 years’ experience
- Full insurance on every job
- A choice of colours where the product allows
Questions from Astwood
Is Astwood in your area for external mastic?
Yes, Astwood is within the area we cover. We work across London and the South East. You can ring 0345 464 0079 or email us and tell us what needs doing.
Do you work for landlords with property near Kempston Hardwick station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or drop us an email with the address and a few details, and we will give you a fixed price before work begins.
Is it worth trying it myself?
You can, for simple jobs. Preparation is everything: all the old sealant out, and a clean, dry joint. We can always put it right if it fails.
Should I point up the gap in my brickwork?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
How long does external mastic take?
A typical job takes a few hours for a handful of joints, longer for a whole elevation, including the preparation. Your quote will say how long we expect yours to take.
Will the new joint stand out?
The sealant colour is picked to suit the wall so the joint blends in. Exterior sealants come in a good range of colours.
Is the work guaranteed?
Yes: twelve months. If anything isn’t right with the work within the year, let us know and we’ll sort it.
Do I need to be at home?
Access is agreed with you when the job is booked. Indoors, that generally means someone at home.
Do you need external mastic in Astwood?
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:
- Joints pointed up with cement by mistake
- Sealant that has lost its bond to the brick or render
- Hard, crazed mastic that has stopped moving
- Cracked joints where brick meets render or frames
For an older house near a landmark such as Church of St Peter, older walls, gutters and the joints where extensions meet them need a flexible sealant.
Before you book anyone
- How much experience the applicator has
- Whether VAT is included
- What guarantee comes with the work
- How the joint is cleaned and prepared
Quotes for external mastic in Astwood
Call for a quick quote. The main things that affect it are:
- The product the joint needs
- The size of the job
- How much old sealant there is and how hard it is to remove
- Any working-time requirements on site
We don’t show prices on the website, because the cost depends so much on the job itself. For a quick quote, please phone 0345 464 0079 or send us an email.
Asking for a quote
You do not need to know the technical terms. Just tell us:
- What’s wrong with the joints now
- Where the job is, and your postcode
- How we’d reach the joints
- Roughly how big the job is
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job, and photos are welcome.
For landlords and businesses
Hotels need rooms back in use, so the work can be planned room by room. Hotel work is part of what we do, alongside homes and businesses.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. We can quote for more than one property at once.
How it works
Our applicators work methodically: protection first, then preparation, sealing and a tidy-up. For most jobs that takes a few hours to a few days, depending on the length of joint and the access and we leave things clean and tidy. In a small place like Astwood, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- First we look over the joints with you, agree which to renew and talk through access.
- The old mastic and anything lodged in the joint is removed.
- Both sides are cleaned back to sound material and primed if needed.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Mention any parking rules near the property
- Tell us about any water getting in
- Keep pets and children clear of the area while we work
Ask for a quote
Quotes start with a quick conversation. Tell us what’s wrong, where it is and how much there is. Whenever you are ready, ring 0345 464 0079 or email us.