Essex · England
External Mastic in Stock
Movement joints in Stock need attention? We remove the old material, prepare the joints and seal them properly, and the work is guaranteed for a year.
- Leaking joints around cladding and façade panels
- Movement joints filled with mortar instead of sealant
- Moss and dirt in joints with no sealant left
What the job involves on each surface
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Render joints
Render is weaker at the surface than brick, so a sealant that stretches easily protects the edges. We prime where the product needs it.
External mastic for homes and businesses in Stock
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Some surfaces need a primer before sealing, and we don’t skip that step. We work on brickwork movement joints, façade panels and concrete & block, and the jobs we see most are old sealant gone brittle and cracked and water getting into walls through failed joints.
Outside joints can only be sealed when they’re dry, so work in Stock is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
Each job carries a 12-month guarantee.
- Location
- Stock (CM4)
- Region
- Essex
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
FAQs for Stock
Is Stock in your area for external mastic?
Yes, Stock is within the area we cover. Our work covers London and the South East. Just phone 0345 464 0079 or send us an email with a few details of the job.
Will you come out to Stock?
Yes, Stock is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Do you have insurance?
Yes. We are fully insured.
How long should I leave it?
That depends on the sealant used, so please follow the time we give you.
How long does external mastic last?
That depends on the wall, the weather and the movement. Signs to watch for are cracking, hardening and gaps at the edges, and reseal at that point.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It should be filled with flexible sealant, never mortar.
Can landlords and businesses book you?
Yes. We work in homes, commercial premises and hotels.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator and we are fully insured too.
Do you need external mastic in Stock?
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Common reasons people contact us include:
- Sealant pulling away from one side of the joint
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
- Rain getting behind render or cladding at a joint
Letting a property close to Billericay station? Then outside joints that have cracked can let damp into a rental, so check them between lets.
What to look for in a quote
- How the joint is cleaned and prepared
- What insurance they hold
- Whether all the old sealant comes out first
- Who does the work, and how experienced they are
Places near Stock
What else we do in Stock
What happens on the day
On the day, we start by going over the job with you, so there are no surprises. We protect the surfaces around the joints before work begins. The work usually takes anything from a few hours to several days, depending on the building. In a small place like Stock, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First we look over the joints with you, agree which to renew and talk through access.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Preparing for the visit
- Move anything stored near the joints
- For business premises, tell us about site rules or sign-in
- Tell us about access, such as stairs, a lift or high-level joints
Getting a quote
Asking for a quote is easy: tell us what needs doing and where. A few pictures by email make the job easier to understand, and we’ll take it from there.
Advice
Landlord and commercial work in Stock
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Mouldy or split sealant often shows up at the end of a tenancy, and it’s quick to put right between tenancies. Several properties can go on one quote.
Can I do it myself?
A careful DIYer can reseal a simple joint, like a short, easy-to-reach joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
The biggest DIY mistake is sealing over old sealant. New silicone will not bond to old, so it lifts and traps water and mould underneath. Everything old must be removed first.
Looking after it afterwards
Looking after new joints is easy:
- Keep high-pressure jets off the joints
- Show decorators and builders where the movement joints are
- Check external joints each spring
- Act on the first splits you see
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Leave a failed movement joint and water keeps getting into the wall. Over time it can mean damp inside, stained render or frost-damaged brick, all bigger jobs than a reseal.
External mastic in Stock: local notes
Historic houses like Ingatestone Hall (about 2.5 miles west) are a reminder that the area around Stock has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Managing a site like Stock Church of England Primary School? Then larger buildings have long runs of movement joint that eventually need resealing. For an older house near a landmark such as Church of All Saints, an extension built onto an older house moves differently, and the joint between them takes the strain.
Stock is about 3 miles north-east of Billericay, in Essex. Whether you’re in the middle of Stock or further out, we cover external mastic for every kind of property. Across Essex, we cover 644 places, Stock among them.
Every address in CM4 is covered for external mastic, from the main roads to the quietest streets. Local streets include The Square, High Street and Webster Place. We also cover the places around Stock: Margaretting Tye (2 miles north), Ramsden Heath (2 miles south-east), Margaretting (2 miles north-west), Downham (3 miles south-east) and Billericay (3 miles south-west). Further out, we also cover Chelmsford (5 miles north), Basildon (6 miles south), Brentwood (7 miles south-west), Maldon (11 miles north-east), Canvey Island (11 miles south-east) and Rayleigh (8 miles south-east).
Near you in Stock
In Stock, that means homes and buildings near The Hoop Public House and Mayflower High School, among other places. The nearest railway station is Billericay station, about 2.7 miles south-west. Well-known places in the area include Mayflower Community Hospital (3.4 miles south-west). The countryside around Stock includes Norsey Wood.
Honest limits
We’d rather tell you now than do work that will not last, so these are the limits:
- Cracked brickwork or render that needs a builder or plasterer
- Cutting new joints into brickwork, which is building work rather than sealant work
- Failed render or damaged cladding panels
Not sure which it is? You can ring 0345 464 0079 or email us and we’ll tell you honestly.
Joints and surfaces we work on
- Joints between brick and frames
- Copings & trims
- Concrete & block
- Façade panels
- Brickwork movement joints
- Render & cladding joints