Hertfordshire · England
Sawbridgeworth External Mastic
We cover Sawbridgeworth for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Old sealant gone brittle and cracked
- Weeds or debris growing in open joints
- Movement joints filled with mortar instead of sealant
Aftercare tips
Once the sealant has cured, a few habits help it last:
- Keep water from gutters off the wall
- Clear growth from the base of walls and joints
- Make sure movement joints aren’t pointed over
- Look over the joints every year, ideally after winter
Give the sealant the cure time we tell you before anything rubs against it. The surface skins over quickly, but full cure takes longer.
Small splits are the time to act. Then it’s a straightforward cut-out and reseal before water has had years to get in.
External mastic in Sawbridgeworth, done properly
Joints between dissimilar materials, like brick against render or concrete against a steel frame, see movement from both sides. A flexible exterior sealant takes up that movement where mortar or filler would crack. Common call-outs are for old sealant gone brittle and cracked and leaking joints around cladding and façade panels, on copings & trims, render & cladding joints and brickwork movement joints.
Houses in smaller places like Sawbridgeworth can stand more in the open than those in a built-up town, and walls and rooflines facing the weather take the worst of it. Joints on those sides are usually the first to go.
You are covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or email us.
- Location
- Sawbridgeworth (CM21, CM22)
- Region
- Hertfordshire
- Guarantee
- 12 months on all our work
- Price
- A clear price before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Why deal with it now?
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The wall then cracks somewhere else. The correct repair is a flexible sealant with the right backing. In an older home around Sawbridgeworth, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Rather than a set price list, we look at what your job involves: the amount of work, the old material and the access. You will know the price before we begin.
What you get with us
- More than 20 years in sealant work
- Quality sealants from Arbo and Everbuild
- Full insurance on every job
- We never seal over old sealant
What we do, step by step
When we get to you, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. Most jobs then take a few hours to a few days, depending on the length of joint and the access. In a smaller place like Sawbridgeworth, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- Closed-cell backing rod is pushed in so the sealant bonds to two sides only.
- We prime the faces where required.
- We gun in low-modulus sealant and tool it neatly.
Before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
- Keep pets and children clear of the area while we work
- Let us know if you’ve seen damp or leaks
How to get a quote
Need a quote? 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.
Related advice
What sealant work cannot fix
New sealant cannot fix everything, and we’ll tell you before we start. Sealant will not put right:
- Subsidence or other structural problems
- Rising or penetrating damp from elsewhere in the wall
- Adding movement joints to masonry that has none
If you are not sure, just ring 0345 464 0079 or email us and we’ll give you a straight answer.
Joints and surfaces we work on
- Render & cladding joints
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Façade panels
- Copings & trims
DIY versus a professional finish
The difference is mostly in the preparation and the product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, and the work is guaranteed for a year.
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. Everything old must be removed first.
Signs you need external mastic in Sawbridgeworth
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, and it tears off the sides.
Common reasons people contact us are:
- Moss and dirt in joints with no sealant left
- Cracked joints where brick meets render or frames
- Failed sealant between panels on a façade
- Rain getting behind render or cladding at a joint
Schools such as Fawbert and Barnard Infants' School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Before booking anyone
- Who turns up on the day
- What guarantee comes with the work
- What the cure time is
- What insurance they hold
Work for landlords, hotels and businesses
A neglected joint can let water reach the structure, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance.
Businesses can book us for washrooms, kitchens, offices and more. For commercial premises, we can talk through working times when we quote.
Nearby places to Sawbridgeworth
What else we do in Sawbridgeworth
FAQs for Sawbridgeworth
Do you cover smaller places like Sawbridgeworth?
Yes, we do. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
I let a flat near Sawbridgeworth station. Can you help?
Yes, landlords and agents are among the people we work for. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Where it moves, gets wet or faces the weather makes a difference, and we’ll tell you what we are using.
Should I point up the gap in my brickwork?
No. Rigid materials can’t move with the wall, so the joint stops doing its job. If it has already been filled, we can normally cut it out and reseal it.
Can you match the colour of my brickwork?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin from the range available.
Where is Mr Mastic based?
Our base is in Crawley, and we work across South East England, London and Scotland.
Will it make a mess?
No. We protect the surfaces around the joints, and we clear up the old sealant and our materials before we leave.
Do you have insurance?
Yes. Full insurance covers our work.
Outside joints around Sawbridgeworth
With historic houses such as Much Hadham Palace (about 4.4 miles north-west) nearby, there’s older building stock in the area around Sawbridgeworth as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Rented homes near Sawbridgeworth station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you live in an older home near Sawbridgeworth Congregational Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
Sawbridgeworth is about 3 miles north-east of Harlow, in Hertfordshire. Wherever you are in the CM21 postcode area, our applicators can take on external mastic. Across Hertfordshire, we cover 381 places, Sawbridgeworth among them. We also work in Chelmsford, about 15 miles from Sawbridgeworth.
Our applicators cover all of the CM21 and CM22 postcode area for external mastic and the streets around it. You will find streets such as London Road, Station Road and Maylins Drive, and we cover them all. Sawbridgeworth is on the A1184, which makes it straightforward to reach. Close by, we work in Lower Sheering (1 mile east), High Wych (1 mile west), Sheering (2 miles east), Spellbrook (2 miles north) and Gaston Green (2 miles north-east). Further out, we also cover Bishop's Stortford (4 miles north), Welwyn Garden City (15 miles west), Hoddesdon (8 miles south-west), Cheshunt (11 miles south-west), Hertford (10 miles west) and Ware (8 miles west).
Landmarks near Sawbridgeworth
Typical jobs here are in homes near Leventhorpe, Gibberd Garden and White Lion Hotel. Sawbridgeworth’s nearest station is Sawbridgeworth station, about 0.7 miles north-east of the centre. Well-known places in the area include Harlow Mill (1.6 miles south-west) and Princess Alexandra Hospital (3.7 miles south-west). Not far away are Sawbridgeworth Marsh and Portingbury Hills.