Hertfordshire · England
External & façade joints in Brent Pelham, Hertfordshire
Movement joints in Brent Pelham need attention? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Movement joints with cracked, split or missing sealant
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
How we handle external mastic in Brent Pelham
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement. Typical jobs include rain getting behind render or cladding at a joint and leaking joints around cladding and façade panels, across joints between brick and frames, façade panels and concrete & block.
Older homes in small places like Brent Pelham may be stone, brick or timber-framed, often with later extensions. Where one material meets another is where water generally gets in.
A 12-month guarantee comes with the work, just as it does everywhere we cover.
- Location
- Brent Pelham (SG9)
- Region
- Hertfordshire
- Cover
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
What the job involves on each surface
Concrete and blockwork
Blockwork and concrete shrink over time and move with the seasons. We reseal their joints with backing rod and a flexible product.
Brickwork movement joints
Vertical joints in long brick walls let the brickwork expand without cracking. We reseal them with a low-modulus sealant over backing rod coloured to suit the wall.
Places near Brent Pelham
Other services in Brent Pelham
Why deal with it now?
Water gets in through a failed movement joint, behind render and cladding. Dealing with it early keeps the repair to the joint, rather than the wall around it. Older cottages and farmhouses around Brent Pelham can have timber floors and frames, where water from a failed joint can cause rot if it’s left.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether we need extra access for height. We take all of that into account in your quote.
Why book with us
- More than 20 years in sealant work
- Rated 4.9 stars on Google
- ARBOMaster approved applicator
- 12-month guarantee on every job
Read our cost guide or what customers say.
What happens on the day
We bring everything the job needs with us. After a quick look at the joints together, the area is protected and the work begins. It normally takes a few hours to a few days, depending on the length of joint and the access. In a small place like Brent Pelham, access is normally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- Each joint is checked and the colour of the new sealant agreed.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- We prime the faces where required.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Let us know if you’ve seen damp or leaks
- Keep pets and children clear of the area while we work
- Tell us about any previous sealing or DIY attempts
Getting a quote
Want a quote for external mastic? Please phone 0345 464 0079 or email us with a few details. We will explain what we’d do and give you a clear quote before we start.
Advice
Walls and rooflines in Brent Pelham
The South East is one of the drier parts of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
In and around Brent Pelham, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Brent Pelham is about 7 miles north-west of Bishop's Stortford, in Hertfordshire. Every kind of property in Brent Pelham is covered for external mastic, old or new, large or small. Every job comes with our 12-month guarantee. Brent Pelham is one of 381 places in Hertfordshire where we work for external mastic. For nearby work, see our Chelmsford page.
Postcode districts we cover here for external mastic: SG9. External mastic is available to properties on Pump Hill and The Causeway and the roads around them. With the B1038 close by, Brent Pelham is easy for our applicators to reach. If you’re just outside Brent Pelham, we cover Furneux Pelham (2 miles south), Great Hormead (2 miles west), Daw's End (2 miles north-west), Anstey (2 miles north-west) and Lower Green (2 miles north). Larger places within reach include Stevenage (12 miles west), Bishop's Stortford (7 miles south-east), Hitchin (15 miles west), Hoddesdon (15 miles south), Hertford (13 miles south-west) and Letchworth (13 miles west).
Around Brent Pelham
Typical jobs here are in homes near The Black Horse Public House and the streets around them. A little further out are Anstey Hales Farm (2 miles north-west).
When to call us in Brent Pelham
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.
The most common problems we see are:
- Movement joints filled with mortar instead of sealant
- Sealant pulling away from one side of the joint
- Panel joints letting water in
- Weeds or debris growing in open joints
If you live in an older home near Church of St Mary, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before you book anyone
- Whether the sealant suits the joint
- How hidden problems are handled
- What the quote includes, VAT included or not
- Whether they seal over old material or remove it
Landlords, agents and businesses in Brent Pelham
Letting agents and landlords in Brent Pelham can book us as well as householders. Resealing between tenancies keeps a property looking cared for.
From a single let to a portfolio, you get the same standard of work: the old material taken out, careful preparation and a 12-month guarantee.
Brent Pelham questions
Is Brent Pelham in your area for external mastic?
Yes. Our work covers London and the South East, and Brent Pelham is part of that. Just phone 0345 464 0079 or email us with a few details of the job.
Do you cover smaller places like Brent Pelham?
Yes, smaller places are covered as well as towns. We work across London and the South East. Just mention lanes, gates or anything else about the route when you book.
Do you use backing rod?
The foam is closed-cell backing rod. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
What information do you need?
The location, the problem and the rough size of the job. Photos by email help too.
Will it make a mess?
Very little: the area around the joints is protected first, and we tidy up before we go.
Are you ARBOMaster approved?
Yes. Mr Mastic is an ARBOMaster approved applicator, and we are fully insured.
Is it worth trying it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. Most DIY failures come from sealing over old material, wet joints or too much sealant.
Should I point up the gap in my brickwork?
No. Cement or mortar can’t stretch. If it has already been filled, we can usually cut it out and reseal it.
When something else is needed
We’ll always be straight with you, so here’s what sealant can’t fix:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Failed render or damaged cladding panels
- Adding movement joints to masonry that has none
If you’re not sure, just ring 0345 464 0079 or drop us an email and we’ll give you a straight answer before booking.
Joints and surfaces we work on
- Concrete & block
- Joints between brick and frames
- Copings & trims
- Façade panels
- Brickwork movement joints
- Render & cladding joints
Keeping the joints in good condition
How long the joints last depends on use and care. Here’s what we suggest:
- Keep movement joints as flexible joints, not mortar
- Clear growth from the base of walls and joints
- 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.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.