Hertfordshire · England
External & façade joints in Colliers End, Hertfordshire
External mastic across Colliers End and nearby, with old sealant always removed completely and a 12-month guarantee.
- Movement joints with cracked, split or missing sealant
- Cracked joints where brick meets render or frames
- Water getting into walls through failed joints
What we do, step by step
You do not need to clear the whole room or building, only the area right around the joints. We protect the rest, and the job takes anything from a few hours to several days, depending on the building for a typical job. Somewhere like Colliers End needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- First, the joints are inspected and the access agreed.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- The exterior sealant is applied, tooled and checked along its length.
Before we arrive
- Move anything stored near the joints
- Mention any tricky access
- Try not to wet indoor joints just before the visit
How to get a quote
Want a quote for external mastic? Please call 0345 464 0079 or drop us an email and tell us about the job. We will explain what we’d do and give you a clear price before work begins.
Related advice
About our external mastic in Colliers End
On houses, flats and commercial buildings across Colliers End, we reseal joints in brickwork, render, cladding and façade panels. The preparation is the same whatever the wall: clean joint faces and the right depth. Typical jobs include rain getting behind render or cladding at a joint and joints where the bead has come unstuck, on render & cladding joints, brickwork movement joints and concrete & block.
Outside joints can only be sealed when they’re dry, so work in Colliers End is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Where
- Colliers End (SG11)
- Region
- Hertfordshire
- Cover
- 12 months on all our work
- Quote
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Should I try it myself first?
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
Colliers End questions
Can you do external mastic in Colliers End?
Yes. Our work covers London and the South East, and Colliers End is part of that. You can ring 0345 464 0079 or email us and let us know what needs doing, and we’ll give you a clear price.
Will you come out to Colliers End?
Yes, smaller places are covered as well as towns. Our work covers London and the South East. Just mention lanes, gates or anything else about the route when you book.
How do you reach high-level joints?
That depends on how high the joints are and the ground below. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
Which products do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice, and we’ll tell you what we are using.
Is it messy?
We keep the work tidy. Nearby surfaces are protected.
Is it worth trying it myself?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs.
Can you do several jobs on one visit?
Yes. Just list everything you need and we’ll quote it together.
Is it OK to fill a movement joint with cement?
No. Rigid materials cannot move with the wall. Where a joint has been mortared, it can often be raked out and sealed properly.
Looking after it afterwards
Joint life depends on how it’s used and looked after. Here’s what we suggest:
- Get split or bare joints resealed while the damage is small
- Ask before painting over external sealant
- Avoid pressure-washing directly into sealant joints
- Check external joints each spring
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
Leave a failed movement joint and water keeps getting into the wall. That can lead to damp patches, staining and frost damage, all bigger jobs than a reseal.
When it is not the sealant
We’d rather tell you now than do work that won’t last, so here’s what sealant cannot put right:
- Render that’s blown, hollow or coming away
- Movement that is more than a sealant joint can take
- Cracking across the wall rather than at a joint
If you are not sure, just call 0345 464 0079 or send us an email and we’ll give you a straight answer before booking.
What we seal
- Façade panels
- Concrete & block
- Joints between brick and frames
- Brickwork movement joints
- Copings & trims
- Render & cladding joints
What the job involves on each surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. Where one has been mortared, we cut it out and reseal it with sealant if the joint can be cleared.
Joints between dissimilar materials
Different materials may need different primers. Both surfaces are cleaned and primed as the product requires.
Outside joints around Colliers End
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. With historic houses such as Much Hadham Palace (about 3.7 miles east) nearby, there’s older building stock in the area around Colliers End 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.
Homes close to St Mary's include some older properties, and an extension built onto an older house moves differently, and the joint between them takes the strain. If you look after a building such as Ralph Sadleir Middle School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Colliers End is about 4 miles north of Ware, in Hertfordshire. Anywhere in SG11, our applicators can take on external mastic. Our area takes in 381 places across Hertfordshire, large and small. We also work in Chelmsford, about 23 miles from Colliers End.
Work in SG11 works the same way as everywhere else we cover. We also cover Standon Green End (1 mile south-west), Barwick (1 mile south-east), High Cross (1 mile south), Sacombe Green (2 miles west) and Puckeridge (2 miles north-east). Within a short drive, we also cover Stevenage (8 miles west), Bishop's Stortford (7 miles east), Welwyn Garden City (9 miles south-west), Harpenden (15 miles west), Hitchin (13 miles north-west) and Hoddesdon (8 miles south).
Local landmarks in Colliers End
In Colliers End, that means homes and buildings near The Lamb and Flag pub and the streets around them. The closest station to Colliers End is Ware station, about 4.2 miles south of the centre. Nearby you will also find Hertford County Hospital (5.9 miles south-west) and Barrowfield (4.9 miles south). Green spaces nearby include King's Meads.
Towns and villages near Colliers End
Also in Colliers End
Do you need external mastic in Colliers End?
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
People usually contact us when they notice one of these:
- Water getting into walls through failed joints
- Hard, crazed mastic that has stopped moving
- Sealant pulling away from one side of the joint
- Failed sealant between panels on a façade
Rented homes near Ware station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Comparing quotes
- Whether the sealant suits the joint
- Whether they’re fully insured
- How the surfaces are prepared before sealing
- How long the guarantee is
Quotes for external mastic in Colliers End
Your quote is based on your job. We take into account:
- Whether old sealant or filler has to be cut out
- Working hours on commercial sites
- Access and height
- How much there is to do
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 will get one clear quote for the whole job.
What to tell us for a quote
Photos by email are helpful but not essential. Please mention:
- Any previous sealing or DIY work
- Access, such as stairs, a lift or height
- If it’s domestic, commercial or a hotel
- What the problem is, such as mould, gaps, leaks or cracking
For external mastic in Colliers End, call 0345 464 0079 or email us. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.