Hertfordshire · England
Uppend External Mastic
We cover Uppend for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly.
- Joints with sealant missing in places
- Joints where the bead has come unstuck
- Failed seals between different materials
External mastic in Uppend
Joints in render and cladding are easy to overlook until a damp patch appears. We inspect them, agree which need doing and reseal with a weatherproof, flexible sealant in a colour to suit. Typical jobs include sealant pulling away from one side of the joint and joints with sealant missing in places, on façade panels, joints between brick and frames and concrete & block.
In a village or hamlet like Uppend, older cottages and farm buildings often stand in the open, so walls and rooflines take the full force of wind and rain. Gutter joints and wall joints there need a sealant that can flex and stay put.
Whatever the size of the job, it’s backed by our 12-month guarantee in Uppend and across Hertfordshire.
- Where
- Uppend (CM23)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
How the job changes by surface
Joints between dissimilar materials
Joints where frames, sills or panels meet the wall are common leak points. We cut out the old sealant and reseal with a product suited to both surfaces.
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
Landlord and commercial work in Uppend
Letting agents and landlords in Uppend can book us as well as householders. Resealing between tenancies is a simple way to keep a property in good order before the next move-in.
If you manage several properties in or around Uppend, jobs at different addresses can go on one quote. Just tell us the addresses and what each one needs, and pictures by email help.
How the visit works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. After that, the work takes anything from a few hours to several days, depending on the building. For a village or hamlet like Uppend, the journey is planned in advance: let us know about lanes, gates and parking. We bring what the job needs, so it can be finished in one trip where possible.
- 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.
- We clean both faces of the joint and prime them where the product calls for it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Tell us about access, such as stairs, a lift or high-level joints
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
Getting a quote
A good description makes for an accurate quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Read more
What we can’t put right
Honest advice matters more to us than a booking, so here’s what new sealant will not do:
- Damp that isn’t coming from the joint
- Adding movement joints to masonry that has none
- Subsidence or other structural problems
If you are not sure, just ring 0345 464 0079 or send us an email and we will give you a straight answer.
Where we work in Uppend
- Render & cladding joints
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
What affects the cost of external mastic
Some jobs are bigger than they look, and some smaller. What affects the quote:
- Any mould that needs treating
- The number of rooms or windows
- How easy the joints are to reach
- The size of the job
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
What we need to know
What to tell us when you ask for a quote:
- What the problem is, such as mould, gaps, leaks or cracking
- Where the job is, and your postcode
- If it’s domestic, commercial or a hotel
- The rough size of the job
Need a quote? Please call 0345 464 0079 or drop us an email and tell us about the job. You will know what we plan to do, and what it will cost, before any work begins.
Why act early in Uppend
Pointing a movement joint with mortar might seem a neat fix, but it locks the joint solid. The wall then cracks somewhere else. A flexible sealant over backing rod is what the joint needs. In a small place like Uppend, homes can be exposed to wind and rain, which finds any gap, and damp in older walls is slow to dry out.
The cost reflects the work involved, not guesswork. That’s why we ask about the job first.
What you get with us
- Neat joints and a tidy finish
- Anti-fungal sanitary silicone in wet areas
- A 12-month guarantee on all work
- ARBOMaster approved applicator
See our cost guide and what customers say.
External mastic in Uppend: local notes
Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. With historic houses such as Much Hadham Palace (about 4.7 miles south-west) nearby, there’s older building stock in the area around Uppend as well as newer homes. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
For site and facilities teams at buildings such as Farnham Church of England Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s. If you let a flat or house near Stansted Mountfitchet station, outside joints that have cracked can let damp into a rental, so check them between lets. If you live in an older home near Church of St Mary the Virgin, an extension built onto an older house moves differently, and the joint between them takes the strain.
Uppend is about 3 miles north of Bishop's Stortford, in Hertfordshire. Every kind of property in Uppend can book us for external mastic, old or new, large or small. Every job comes with our one-year guarantee. Our area takes in 381 places across Hertfordshire, from the larger towns to small villages. Chelmsford is on our list too, around 19 miles away.
Our applicators cover all of CM23 for external mastic. Close by, we work in Mount Pleasant (1 mile north-east), Farnham (1 mile south), Manuden (1 mile east), The Willows (2 miles north-west) and Stocking Pelham (2 miles north-west). We also work in nearby towns such as Stevenage (14 miles west), Bishop's Stortford (3 miles south), Hoddesdon (13 miles south-west), Hertford (12 miles south-west), Ware (10 miles south-west) and Baldock (15 miles west).
Local landmarks in Uppend
The nearest railway station is Stansted Mountfitchet station, about 2.9 miles east of the centre. A little further out are Bishops Stortford Local History Museum (2.4 miles south) and Herts and Essex Hospital (3.9 miles south-east). Green spaces nearby include Aubrey Buxton Nature Reserve.
Other services in Uppend
Common questions in Uppend
Will you come out to Uppend?
Yes, we do. Our work covers London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you work for landlords with property near Stansted Mountfitchet station?
Yes, we work for letting agents and landlords. You can phone 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before work begins.
Will the new joint stand out?
The aim is a neat, even joint in a colour that suits the wall. We will talk through colour options before any work starts from the range available.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Where is Mr Mastic based?
We’re a Crawley-based firm. Our area covers South East England, London and Scotland.
How do I get a quote for external mastic in Uppend?
There’s no set price, as it depends on the job: its size, the old material, access and the product needed. We agree the price before any work begins.
Are you insured?
Yes. Full insurance covers our work, and we can confirm the details when we quote.
Is it OK to fill a movement joint with cement?
No, not if it’s a movement joint. Filling it with mortar defeats its purpose and can lead to cracking. A flexible sealant is the right fill.
How to look after the new joints
No joint lasts for ever, but care makes a real difference. A few tips:
- Keep soil, plants and ivy away from the joints
- Point out the joints to other trades
- Get split or bare joints resealed while the damage is small
- Never let anyone fill a movement joint with mortar
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They must stay as flexible joints, never rendered or pointed over.
An open movement joint lets rain into the wall every time it pours. That can lead to damp patches, staining and frost damage.