Essex · England
Norton Mandeville External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Norton Mandeville and across Essex. Fully insured, ARBOMaster approved and guaranteed for a year.
- Cracked joints where brick meets render or frames
- Movement joints filled with mortar instead of sealant
- Plants rooting in failed movement joints
Questions from Norton Mandeville
What guarantee comes with external mastic in Norton Mandeville?
All our work, in Norton Mandeville and everywhere else, comes with a 12-month guarantee. We are also fully insured and ARBOMaster approved.
Can you do external mastic in Norton Mandeville?
Yes. Our work covers London and the South East, and Norton Mandeville is part of that. You can phone 0345 464 0079 or drop us an email and tell us what needs doing.
Why is there a gap in my brick wall?
Brickwork, render and cladding all move a little, so long walls have planned gaps to take that movement. The gap is sealed with a flexible sealant over backing rod.
Where are you based?
Mr Mastic is based in Crawley. We cover Norton Mandeville and the rest of Essex.
Will the new joint stand out?
Exterior sealants are made in a range of colours, from greys and browns to whites and stone shades. We choose the closest to your brick or render so it does not stand out.
Can you quote for more than one area?
Yes. More than one area can go on one quote.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
About our external mastic in Norton Mandeville
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing all tend to fail early. We take the old material out and do it properly. We work on copings & trims, façade panels and brickwork movement joints, and the jobs we see most are rain getting behind render or cladding at a joint and plants rooting in failed movement joints.
Older homes in small places like Norton Mandeville may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water normally gets in, and they need the right sealant at the right depth.
All our work is covered by our 12-month guarantee.
- Place
- Norton Mandeville (CM5, CM4)
- Wider area
- Essex
- Guarantee
- One year on every job
- Quote
- A clear price before we start
- Telephone
- 0345 464 0079
- Last updated
- 26 October 2026
What we do, step by step
The work is kept neat and contained to the joints we are treating. The job normally takes anything from a few hours to several days, depending on the building, and we tell you how long to leave it before we go. In a small place like Norton Mandeville, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We start by walking round the building and agreeing the joints and the access.
- We cut out the old mastic and rake out anything in the joint.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Let us know about parking restrictions
- Let us know about earlier repairs to the joints
- Mention any leaks or damp you’ve noticed
Getting a quote
For external mastic in Norton Mandeville, phone 0345 464 0079 or send us an email. Tell us what the problem is and where, and you will get a clear quote before work begins.
Related advice
How to look after the new joints
After the cure time, these simple habits help:
- Look over the joints every year, ideally after winter
- Don’t let climbing plants root in the sealant
- Tell anyone working on the walls about the movement joints
- Never let anyone fill a movement joint with mortar
Do not paint over the new sealant unless we have said the product is paintable. Many exterior sealants aren’t designed to be painted.
Once a joint can’t move, the wall finds another way, often as cracks near the joint. Resealing it early helps prevent that.
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
Towns and villages near Norton Mandeville
What else we do in Norton Mandeville
Walls and rooflines in Norton Mandeville
Compared with the north and west, the South East gets less rain, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to Church of All Saints include some older properties, and old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Norton Mandeville is about 6 miles north of Brentwood, in Essex. Across the CM5 area, we cover external mastic for homes and businesses. Norton Mandeville is one of 644 places in Essex we cover for external mastic. For nearby work, see our Chelmsford page.
Every address in CM5 and CM4 is covered for external mastic, from the main roads to the quietest streets. We also cover King Street (1 mile south-east), Cannon's Green (1 mile north), High Ongar (1 mile south-west), Fyfield (1 mile north) and Clatterford End (2 miles north-west). Further out, we also cover Chelmsford (9 miles east), Basildon (13 miles south-east), Harlow (8 miles north-west), Brentwood (6 miles south), Billericay (9 miles south-east) and Loughton (11 miles south-west).
What’s near Norton Mandeville
Locally, jobs take us to homes and businesses close to Forester's Arms and The Ongar Academy. Well-known places in the area include Willingale Doe (2.6 miles north-east).
Honest limits
In fairness, some problems need a different trade:
- Subsidence or other structural problems
- Adding movement joints to masonry that has none
- Cracks in the bricks or render themselves, away from the joints
If in doubt, phone 0345 464 0079 or email us and we will say what we think before booking.
Where we work in Norton Mandeville
- Brickwork movement joints
- Copings & trims
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Façade panels
Surface by surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that’s happened, we rake it out and reseal it properly if the joint can be cleared.
Concrete and blockwork
Concrete faces can be dusty and porous, so cleaning and priming matter. We prime where the sealant needs it.
What happens if it’s left?
The longer a joint stays open, the more water the wall takes in. In cold weather, frost can damage wet brick and render around the joint, so the problem grows beyond the joint itself. Where a wall is exposed, as many are in small places like Norton Mandeville, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. The price is agreed before we begin.
Why choose Mr Mastic in Norton Mandeville
- Old sealant always removed completely
- We agree the colour with you first
- Sanitary silicone with an anti-fungal additive in wet areas
- An ARBOMaster approved applicator
Take a look at our cost guide and customer reviews.
Signs you need external mastic in Norton Mandeville
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and speed up the damage.
These are the problems we are asked about most:
- Hard, crazed mastic that has stopped moving
- Rigid filler in a joint that should flex
- Sealant pulling away from one side of the joint
- Moss and dirt in joints with no sealant left
Managing a site like High Ongar Primary School? Then larger buildings have long runs of movement joint that eventually need resealing.
Questions to ask before booking
- What preparation is included
- Is VAT in the price?
- When the joint can take water or movement
- Who turns up on the day