Hertfordshire · England
External & façade joints in Aston, Hertfordshire
Sealing brickwork movement joints, render, cladding and façade joints for Aston, backed by a one-year guarantee. Ask us for a quote.
- Joints with sealant missing in places
- Joints where the bead has come unstuck
- Rigid filler in a joint that should flex
How we handle external mastic in Aston
Many failed façade joints only get noticed once there’s a stain or a damp patch inside. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. We work on brickwork movement joints, façade panels and concrete & block, and people most often call us about joints pointed up with cement by mistake and brick movement joints where the sealant has split.
Outside joints can only be sealed when they’re dry, so work in Aston is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
The work is guaranteed for twelve months. If something isn’t right with it in that time, tell us and we’ll put it right.
- Location
- Aston (SG2)
- Region
- Hertfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Leave it or put it right?
Sealing over the top of old mastic does not hold for long. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. In a small place like Aston, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Doing several joints on one visit generally makes better use of the time than several visits. We will give you a clear price for the lot.
Why book with us
- An ARBOMaster approved applicator
- Homes, businesses and hotels
- Rated 4.9 stars on Google
- Sanitary silicone with an anti-fungal additive in wet areas
Take a look at what affects the cost and what customers say.
What affects the quote in Aston
We quote each job individually. These are the things that affect it:
- The number and length of the joints
- How many rooms, windows or areas are involved
- The product the joint needs
- How easy the joints are to reach
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you are unsure, call 0345 464 0079 or email us for an honest opinion and a quote.
What we need to know
Photos help, but a description is a good start. Please mention:
- If someone has resealed it before
- The address or postcode of the job
- Roughly how big the job is
- The type of property
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or email us and describe the job, and pictures are welcome.
Surface by surface
Joints between dissimilar materials
Brick against render, concrete against metal, stone against timber: every change of material is a joint. We seal the joint with a flexible exterior sealant so neither cracks the other.
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
External mastic in Aston: local notes
Stevenage, which Aston is part of, is one of England’s post-war new towns. Homes here were built in phases, many of them in the post-war decades, so whole streets can have gutters, trims and wall joints reaching the end of their life together. Historic houses like Aston Bury (about 0.7 miles south) are a reminder that the area around Aston 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.
Schools such as Aston St Mary's Church of England Aided Primary School are buildings too, and movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. For an older house near a landmark such as Parish Church of St Mary the Virgin, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Aston is about 2 miles south-east of Stevenage, in Hertfordshire. We provide external mastic to homeowners, landlords and businesses in Aston and the surrounding area, as part of our work across Hertfordshire. Our area takes in 381 places across Hertfordshire, large and small. You can also see our page for London, about 27 miles away.
Work in SG2 works the same way as everywhere else we cover. Whether your property is on Penn Close, Benington Road and Brook Field or a nearby road, we can help. Neighbouring places we cover for external mastic include Bragbury End (1 mile south), Shephall (1 mile west), Hook's Cross (1 mile south), Benington (2 miles east) and Knebworth (2 miles south-west). We also work in nearby towns such as St Albans (12 miles south-west), Bishop's Stortford (13 miles east), Welwyn Garden City (7 miles south), Harpenden (10 miles south-west), Hitchin (7 miles north-west) and Hoddesdon (11 miles south-east).
Landmarks near Aston
Typical jobs here are in homes near The Heathcote School, Rose And Crown Public House and Barnwell School. The closest station to Aston is Knebworth station, about 2.2 miles south-west. A little further out are Benington Castle (1.5 miles east) and Stevenage Museum (2.3 miles north-west). Not far away are Ridlins Mire.
What we do, step by step
We bring everything the job needs with us, so you do not need to buy or prepare anything. Once we’ve agreed what’s being done, the area is protected and the work begins. It normally takes a few hours for a handful of joints, longer for a whole elevation. Somewhere like Aston needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. 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 will reach them.
- Old sealant and any debris are cut and raked out.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Where the joints are inside, avoid wetting them before we arrive
- Mention any tricky access
- Tell us about any previous sealing or DIY attempts
Getting a quote
Want a quote for external mastic? Please phone 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Advice
What else we do in Aston
Common problems we fix in Aston
Many joints fail because they were sealed too deep or with nothing behind them. Sealant bonded to three sides has nowhere to go and tears as soon as the joint widens.
Look out for any of the following:
- Moss and dirt in joints with no sealant left
- Cracked joints where brick meets render or frames
- Failed sealant between panels on a façade
- Movement joints filled with mortar instead of sealant
Rented homes near Knebworth station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Before booking anyone
- What happens if the job turns out different
- Is the old sealant removed completely?
- Whether the sealant suits the joint
- Who turns up on the day
Aston: your questions answered
Can you help a landlord with a rental near Knebworth station?
Yes, we work for landlords and agents. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Is it worth replacing old sealant in an older home in Aston?
If it hasn’t been replaced for some years, it’s generally worth it. Sealant is a maintenance item: how long it lasts depends on use, cleaning and exposure.
Can you quote for more than one area?
Yes. Just list everything you need.
Are you an approved applicator?
Yes. We’re an ARBOMaster approved applicator, which is run for the Arbo sealant brand.
Do you do commercial work?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Are you fully insured?
Yes. We are fully insured, and we can confirm the details when we quote.
Do the sealants smell?
Sometimes, a little. Any smell clears as the sealant cures.
How do I get a quote for external mastic in Aston?
The cost depends on the size of the job, access and how much old sealant has to come out. Ask us for a quote and we’ll talk you through it.
Looking after it afterwards
Looking after new joints is easy:
- Avoid pressure-washing directly into sealant joints
- Keep water from gutters off the wall
- Look over the joints every year, ideally after winter
- Get split or bare joints resealed while the damage is small
Make sure anyone working on the wall later knows where the movement joints are. They should be kept open and resealed, not filled.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
DIY versus a professional finish
The biggest DIY mistake is sealing over old sealant. Silicone doesn’t stick to old silicone, so it lifts and traps water and mould underneath. All the old material has to come out first.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.