Hertfordshire · England
External Mastic in Ashwell End
Sealing brickwork movement joints, render, cladding and façade joints for Ashwell End, backed by a 12-month guarantee. Ask us for a quote.
- Sealant pulling away from one side of the joint
- Brick movement joints where the sealant has split
- Panel joints letting water in
How the job changes by surface
Brickwork movement joints
Clay brickwork grows slightly over its life and moves with the weather. That movement goes into the joint, so the sealant in it must stay soft and stretchy.
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it before the bead.
External mastic in Ashwell End, done properly
Short cuts in external joints show up within a season or two. Overfilled joints, missing backing rod and sealant laid over old sealant rarely last long. We strip the joint back and start again. If you’re dealing with water getting into walls through failed joints and gaps where render, brick and frames meet, we can put it right, on copings & trims, brickwork movement joints and concrete & block alike.
Older homes in small places like Ashwell End may be stone, brick or timber-framed, often with later extensions. The joints where those materials meet are the weak points.
You get a 12-month guarantee, the same in Ashwell End as everywhere else we work.
- Location
- Ashwell End (SG7)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
How it works
Before we leave, we go over the finished joints with you and explain the cure time. The work normally takes anything from a few hours to several days, depending on the building, depending on the size of the job. In a small place like Ashwell End, access is usually the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- 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.
- We gun in low-modulus sealant and tool it neatly.
Preparing for the visit
- Move anything stored near the joints
- Tell us about any water getting in
- Mention any parking rules near the property
How to get a quote
We don’t publish a price list, because every job is different. Instead, we give you a clear quote for your job. To get started, ring 0345 464 0079 or send us an email.
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Questions from Ashwell End
Is Ashwell End in your area for external mastic?
Yes, Ashwell End is within the area we cover. We work across London and the South East. You can call 0345 464 0079 or send us an email and let us know what needs doing, and we will give you a clear quote.
I let a flat near Ashwell & Morden station. Can you help?
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.
Why do you put foam in the joint first?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. That way it bonds to the two sides only and can stretch.
Is it OK to fill a movement joint with cement?
No. Cement or mortar cannot stretch and the joint fails. Where a joint has been mortared, it can often be raked out and sealed properly.
Do you work for hotels and businesses?
Yes. Larger jobs can be planned room by room or area by area.
How long does the job take?
It depends on the size of the job, but most jobs take anything from a few hours to several days, depending on the building. We will give you a better idea when we quote.
Can I do 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.
What’s an expansion joint in brickwork?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Why deal with it now?
Sealing over the top of old mastic doesn’t 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 Ashwell End, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
What it costs depends on how much there is to do, how much old material has to come out and access to the work. We give a clear quote before any work starts.
Why book with us
- Arbo and Everbuild products
- We leave the area clean and tidy
- Anti-fungal sanitary silicone in wet areas
- One-year guarantee on every job
Take a look at our cost guide and what customers say.
What else we do in Ashwell End
DIY sealant or a professional job?
If you’re set on DIY, put the effort into preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
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.
Do you need external mastic in Ashwell End?
Weeds, moss and debris in a joint are a sign the sealant has gone. Dirt and roots then trap moisture in the joint and speed up the damage.
Signs it’s time to call us include:
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
- Movement joints filled with mortar instead of sealant
- Joints where the bead has come unstuck
Managing a site like Ashwell Primary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Comparing quotes
- How the colour is chosen
- How long to leave it before use
- Who turns up on the day
- Whether they’re fully insured
What affects the quote in Ashwell End
Your quote is based on your job. We look at:
- Access and height
- Whether old sealant or filler has to be cut out
- Whether there’s mould to deal with
- The number of rooms or windows
Combining jobs into one visit normally makes better use of the time than several visits, so it’s worth mentioning everything you’d like done. You’ll get one clear quote for the whole job.
Asking for a quote
To make quoting easier, please include:
- The problem you’ve noticed
- If someone has resealed it before
- Where the property is
- How many joints, rooms or windows are involved
Want a quote for external mastic? Please ring 0345 464 0079 or send us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
For landlords and businesses
If you manage several properties in or around Ashwell End, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Outside joints around Ashwell End
London and the South East are among the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Hinxworth Place (about 0.9 miles west) nearby, there’s older building stock in the area around Ashwell End as well as newer homes. In older buildings, older brick and stone need a sealant that suits them, at the right joint depth.
Letting a property close to Ashwell & Morden station? Then outside joints that have cracked can let damp into a rental, so check them between lets. Homes close to St Mary's Church include some older properties, and the joints between older walls, newer extensions and the roofline need a sealant that can move.
Ashwell End is in Hertfordshire. For external mastic in and around Ashwell End, please call 0345 464 0079 or drop us an email for a quick quote. We cover Hertfordshire from our Crawley base, Ashwell End included. Ashwell End is one of 381 places in Hertfordshire we cover. There’s also a page for Chelmsford, about 35 miles away.
Jobs for external mastic in SG7 works the same way as everywhere else we cover. If you are just outside Ashwell End, we cover Bury End (1 mile west), Ashwell (1 mile east), Hinxworth (1 mile west), Caldecote (1 mile south-west) and Newnham (2 miles south). Larger places within reach include Stevenage (9 miles south), Hitchin (8 miles south-west), Letchworth (5 miles south-west), Letchworth Garden City (5 miles south-west), Stotfold (3 miles south-west) and Baldock (4 miles south).
What’s near Ashwell End
Around Ashwell End, our work takes us to homes and buildings near Rose And Crown Public House and the streets around them. Ashwell End’s nearest station is Ashwell & Morden station, roughly 2.9 miles east. Well-known places in the area include Fairfield Hospital (4.3 miles south-west) and Ashwell Village Museum (0.9 miles east). Green spaces nearby include Arlesey Old Moat and Glebe Meadows.