Buckinghamshire · England
External & façade joints in Speen, Buckinghamshire
External mastic for Speen, by sealant specialists with 20+ years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Sealant that has lost its bond to the brick or render
- Movement joints filled with mortar instead of sealant
- Failed seals between different materials
DIY sealant or a professional job?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
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.
External mastic in Speen
Movement joints let brickwork, render and cladding expand and shrink without cracking. Its sealant has to flex with the building, season after season, so once it splits or hardens, the joint stops working and water gets in. Typical jobs include joints with sealant missing in places and rigid filler in a joint that should flex, on joints between brick and frames, render & cladding joints and concrete & block.
Outside joints can only be sealed when they’re dry, so work in Speen is booked around the forecast. Let us know about access to every wall, plus any garages or outbuildings.
There’s a 12-month guarantee on every job, large or small.
- Place
- Speen (HP27)
- Region
- Buckinghamshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Towns and villages near Speen
Other services in Speen
Speen: your questions answered
Do you work for landlords with property near Saunderton station?
Yes, rental work is part of what we do. You can phone 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before any work starts.
Is Speen within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
Can I add another job to the visit?
Yes, and it often makes sense. Doing several areas at once is normally more efficient.
Where do you work from?
Mr Mastic is based in Crawley. Our applicators cover Speen, along with the rest of our area.
Are you fully insured?
Yes, we’re fully insured for domestic and commercial work.
What sealant do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We explain the product when we quote.
What do you need from me for a quote?
Tell us what needs doing and where, with photos by email if possible. We will ask anything else we need to know.
How it works
A visit follows a simple pattern: we check the joints, mask and protect the surrounding surfaces, do the work and tidy away. Most jobs take a few hours to a few days, depending on the length of joint and the access. In a small place like Speen, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Mention if the joints have been sealed before
- Where the joints are inside, avoid wetting them before we arrive
- Let us know about stairs, lifts or work at height
How to get a quote
Want a quote for external mastic? Please ring 0345 464 0079 or send us an email with a few details. We’ll explain what we’d do and give you a clear price before we start.
Advice
When something else is needed
Before you book, it’s worth knowing the limits:
- Render that is blown, hollow or coming away
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Cutting new joints into brickwork, which is building work rather than sealant work
Not sure which it is? You can phone 0345 464 0079 or drop us an email and we’ll tell you honestly.
Joints and surfaces we work on
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Copings & trims
What external mastic looks like in Speen
Historic houses like Hughenden Manor (about 3.1 miles south) are a reminder that the area around Speen 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. Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you let a flat or house near Saunderton station, failed wall and movement joints let damp in, so they’re worth checking between tenancies. Homes close to Speen Church (Baptist) include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. If you look after a building such as Speen CofE VA School, larger buildings have long runs of movement joint that eventually need resealing.
Speen is about 5 miles north of High Wycombe, in Buckinghamshire. Across the HP27 area, our applicators can take on external mastic. Across Buckinghamshire, we cover 263 places, and Speen is one of them. Our Reading page covers work nearby.
Our applicators cover all of HP27 for external mastic. Whether your property is on St Peters Close, Studridge Lane and Chapel Hill or anywhere close by, our applicators can take on the job. We also cover Upper North Dean (1 mile south-east), Bryant's Bottom (1 mile east), Walter's Ash (1 mile south), Lower North Dean (1 mile south-east) and Stony Green (1 mile east). Larger places within reach include Aylesbury (9 miles north), High Wycombe (5 miles south), Chesham (8 miles east), Marlow (8 miles south), Amersham (8 miles east) and Beaconsfield (8 miles south-east).
Local landmarks in Speen
Locally, jobs take us to homes and businesses close to King William IV Public House and the streets around them. Speen’s nearest station is Saunderton station, roughly 2.1 miles south-west of the centre. Other landmarks nearby include Roald Dahl Museum and Story Centre (3.4 miles east) and Great Kimble Dial Hill (3.9 miles north). Open spaces near Speen include Beacon Hill and Prestwood Local Nature Reserve.
Different surfaces, different methods
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod.
Cladding and façade panels
Metal and composite panels move a lot with temperature, so the joints work hard every day. We choose the product to suit.
What happens if it’s left?
Low-modulus sealants stretch easily, so they put less strain on the joint edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. Around Speen, older homes often have timber in their floors and frames, and water through a failed joint can rot timber if it’s left.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
What you get with us
- Sealant colour chosen to suit
- White, clear, grey or another colour, product permitting
- ARBOMaster approved applicator
- 180+ five-star Google reviews
Read what affects the cost or customer reviews.
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Resealing at the right time is simple maintenance.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will quote.
Keeping the joints in good condition
Good habits help new joints last longer. Our tips:
- Keep water from gutters off the wall
- Walk round the building once a year and look at the joints
- Point out the joints to other trades
- Keep movement joints as flexible joints, not mortar
Keep pressure washers away from the sealant. High-pressure water can lift the edges over time.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal.