Hertfordshire · England
Hinxworth External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Hinxworth, backed by a 12-month guarantee. Ask us for a quote.
- Failed seals between different materials
- Joints where the bead has come unstuck
- Old sealant gone brittle and cracked
External mastic in Hinxworth, done properly
Ground-floor and low-level joints are straightforward to reach. Where joints are higher up, tell us about the building when you get in touch and we’ll confirm what access is needed. If you have joints pointed up with cement by mistake and joints with sealant missing in places, we can put it right, on copings & trims, façade panels and joints between brick and frames alike.
External sealant needs dry, clean surfaces, so work around Hinxworth is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Big or small, it’s backed by our 12-month guarantee.
- Place
- Hinxworth (SG7)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
Most of a good job is in the preparation, and we do not rush it. Joints are cleaned back and dried before anything new goes in. In total, it normally takes a few hours for a handful of joints, longer for a whole elevation. For a village or hamlet like Hinxworth, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- We start by checking each joint, agreeing the ones to redo and how we’ll reach them.
- 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
How to prepare
- Mention any leaks or damp you’ve noticed
- Plan for the work area to be out of bounds to pets and children
- Tell us if parking is tricky
Getting a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and email photos if that is easy.
Read more
Towns and villages near Hinxworth
More services for Hinxworth
DIY versus a professional finish
A DIY attempt doesn’t rule out a professional job. We cut it out and start again, so just mention it when you contact us.
Sealing over old silicone is the commonest DIY error. Silicone doesn’t stick to old silicone, so it peels away and traps moisture behind it. All the old material has to come out first.
What external mastic looks like in Hinxworth
Historic houses like Hinxworth Place (about 0.6 miles south) are a reminder that the area around Hinxworth has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
If you live in an older home near Church of St Nicholas, old and new materials meet at the roofline and walls, which is where sealant earns its keep. Letting a property close to Arlesey station? Then split movement joints are easy to miss on a rental until damp shows inside.
Hinxworth is in Hertfordshire. Homes, rented property, offices and hotels in Hinxworth can book us for external mastic. The work is guaranteed for a year. Our Hertfordshire coverage runs to 381 places, and Hinxworth is one of them. Our Chelmsford page covers work nearby.
We work across the SG7 postcode area for external mastic. You’ll find streets such as High Street, Homefield and Chapel Street, and we cover them all. We also cover the places around Hinxworth: Bury End (1 mile south-east), Ashwell End (1 mile east), Caldecote (1 mile south), Newnham (2 miles south) and Ashwell (2 miles east). We also work in nearby towns such as Stevenage (10 miles south), Hitchin (8 miles south-west), Letchworth (5 miles south), Letchworth Garden City (5 miles south), Stotfold (3 miles south-west) and Baldock (4 miles south).
Landmarks near Hinxworth
The nearest railway station is Arlesey station, about 3.3 miles south-west. Well-known places in the area include Fairfield Hospital (3.9 miles south-west) and Ashwell Village Museum (2 miles east). For a walk, there’s Arlesey Old Moat and Glebe Meadows.
Different surfaces, different methods
Concrete and blockwork
Wide joints in concrete need the depth controlling carefully. We size the backing rod to the gap and keep the sealant to the right depth.
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. The old joint is removed and a sealant that bonds to both sides goes in.
What happens if it’s left?
Mortar or ordinary filler might look like a quick way to close an open joint, but it locks the joint solid. The movement then cracks the brickwork or render nearby. The correct repair is a flexible sealant with the right backing. Around Hinxworth, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
No two jobs are quite the same, so we quote each one individually. The number of joints, how easy they are to reach and the sealant needed all play a part.
Why book with us
- Arbo and Everbuild products
- One-year guarantee on every job
- A sealant colour to suit the surroundings
- Any old sealant cut out fully, not covered over
Take a look at what affects the cost or what customers say.
Your questions about external mastic in Hinxworth
Can you help a landlord with a rental near Arlesey station?
Yes, rental work is part of what we do. Just call 0345 464 0079 or email us and tell us about the property, and we will send you a clear quote.
Is Hinxworth within the area you cover?
Yes, Hinxworth is covered. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
How long should I leave it?
Different products cure at different speeds, so please follow the time we give you.
How often do external joints need resealing?
It varies with how exposed the wall is and how much the joint moves. Look for splits, hardening or edges coming away, and reseal at that point.
Where do you work from?
Our base is Crawley, with over 20 years’ experience. We work across South East England, London and Scotland.
What information do you need?
A short description and the location, plus pictures if you have them. We will ask anything else we need to know.
Do the sealants smell?
Possibly a little. Any smell clears as the sealant cures, and ventilation helps.
How do you reach high-level joints?
Each building is different. Tell us the height, the number of joints and what’s below them and we’ll confirm how they can be reached safely.
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Keep high-pressure jets off the joints
- Leave the joints unpainted unless we’ve said otherwise
- Keep soil, plants and ivy away from the joints
- Make sure movement joints aren’t pointed over
Look over the joints once a year, ideally after winter. Splits, gaps at the edges or plants in the joint are early warning signs.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
How we quote for external mastic
Jobs vary more than people expect. What affects the quote:
- Whether there’s mould to deal with
- How much old sealant there is and how hard it is to remove
- How many areas need sealing
- The type of sealant required
Doing several joints on one visit generally makes better use of the time than several visits, so tell us about everything that needs sealing. You will get one clear quote for the whole job.
What to tell us for a quote
Photos help, but a description is a good start. Try to tell us:
- Whether it has been sealed before
- Roughly how big the job is
- Where the job is, and your postcode
- The problem you’ve noticed
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job.
When it isn’t the sealant
We’ll always be straight with you, so here’s what new sealant won’t do:
- Cracked brickwork or render that needs a builder or plasterer
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Loose or hollow render, which needs re-rendering
If you are not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer.
Where we work in Hinxworth
- Render & cladding joints
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
- Brickwork movement joints