Hertfordshire · England
External Mastic in Bulls Cross
External mastic in Bulls Cross from a team with over 20 years’ experience. Rated 4.9 on Google from 180+ five-star reviews.
- Rigid filler in a joint that should flex
- Movement joints with cracked, split or missing sealant
- Gaps where render, brick and frames meet
How we handle external mastic in Bulls Cross
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we will confirm what access is needed. We work on copings & trims, render & cladding joints and concrete & block, and people most often call us about movement joints filled with mortar instead of sealant and plants rooting in failed movement joints.
External sealant needs dry, clean surfaces, so work around Bulls Cross is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
Whatever the size of the job, you get the same 12-month guarantee.
- Location
- Bulls Cross (EN1, EN3, EN8)
- Wider area
- Hertfordshire
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
When something else is needed
To be straight with you, there are a few things sealant won’t fix:
- Movement that is more than a sealant joint can take
- Cutting new joints into brickwork, which is building work rather than sealant work
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer before booking.
Surfaces we seal
- Copings & trims
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
Keeping the joints in good condition
Looking after new joints is easy:
- Deal with leaking gutters that soak the joints below
- Get split or bare joints resealed while the damage is small
- Keep movement joints as flexible joints, not mortar
- Avoid pressure-washing directly into sealant joints
Follow the cure time we give you before the joint is knocked or disturbed. Most exterior sealants skin fast but take longer to cure right through.
Act while the splits are small. Then it’s a straightforward cut-out and reseal.
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render near the open joint, so the problem grows beyond the joint itself. Around Bulls Cross, older homes often have timber in their floors and frames, where water from a failed joint can cause rot if it’s left.
Leaving a failed joint usually makes the job bigger, not smaller, as water and mould keep getting in. If you are not sure whether it needs doing, phone 0345 464 0079 or drop us an email and we will give you an honest view and a quote.
What you get with us
- Trusted Arbo and Everbuild sealants
- White, clear, grey or coloured to suit, where the product allows
- Tidy, careful work
- A 12-month guarantee on all work
Read what affects the cost or our reviews.
What we are called out for in Bulls Cross
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
These are the problems we’re asked about most:
- Hard, crazed mastic that has stopped moving
- Damp patches traced to an open external joint
- Failed seals between different materials
- Leaking joints around cladding and façade panels
For an older house near a landmark such as Jesus Church, older walls, gutters and the joints where extensions meet them need a flexible sealant.
What to look for in a quote
- Are they insured?
- How the joint is cleaned and prepared
- Whether VAT is included
- The length of the guarantee
Bulls Cross: your questions answered
Is Bulls Cross within the area you cover?
Yes, Bulls Cross is covered. We work across London and the South East, from towns to the smallest places. The journey is planned ahead, so it helps to know about access.
Is Bulls Cross in your area for external mastic?
Yes, Bulls Cross is within the area we cover. Our work covers London and the South East. You can call 0345 464 0079 or send us an email and tell us what needs doing.
What is backing rod for?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the wall cracks somewhere else instead. Use a flexible sealant with backing rod.
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.
Can you reach joints on upper floors?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we’ll confirm the access.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
Do you remove the old sealant?
Yes. Sealing over old sealant is the main reason resealing fails early, so we never do it.
Places near Bulls Cross
What else we do in Bulls Cross
Walls and rooflines in Bulls Cross
With historic houses such as Forty Hall (about 0.7 miles south-west) nearby, there’s older building stock in the area around Bulls Cross as well as newer homes. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material. Compared with the north and west, the South East gets less rain, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Schools such as Capel Manor Primary School are buildings too, and its movement joints, gutters and trims need looking after like any other building’s. For landlords with property near Turkey Street station, split movement joints are easy to miss on a rental until damp shows inside.
Bulls Cross is about 2 miles north-east of Enfield, in Hertfordshire. Homes, rented property, offices and hotels in Bulls Cross is covered for external mastic, old or new, large or small. The work is guaranteed for a year. Bulls Cross is one of 381 places in Hertfordshire where we work for external mastic. You can also see our page for London, roughly 12 miles from Bulls Cross.
Here we cover the EN1, EN3 and EN8 postcode area for external mastic. We cover properties on Capel Road, Kempe Road and Yews Avenue and the roads around them. Bulls Cross is on the M25, so it’s easy for us to get to. Neighbouring places we cover for external mastic include Bullsmoor (1 mile east), Forty Hill (1 mile south), Enfield Wash (1 mile south-east), Clay Hill (1 mile west) and Freezywater (1 mile east). Larger places within reach include Watford (15 miles west), St Albans (13 miles north-west), Welwyn Garden City (10 miles north-west), Hoddesdon (6 miles north), Hatfield (9 miles north-west) and Hertford (8 miles north).
Near you in Bulls Cross
Around Bulls Cross, our work takes us to homes and buildings near Aylands School, St Ignatius College and The Pied Bull Public House and the streets around them. The nearest railway station is Turkey Street station, roughly 0.6 miles south-east. Nearby you will also find Museum of Enfield (2.1 miles south-west) and St Michaels Hospital (1.6 miles south-west). Green spaces nearby include Bowyer's Water and Fir and Pond Woods.
Quotes for external mastic in Bulls Cross
You will get a clear quote before work begins. It’s based on:
- The type of sealant required
- Working hours on commercial sites
- The old material and how stubborn it is
- How many rooms, windows or areas are involved
We don’t show prices on the website, because each job is priced on what it involves. Call for a quick quote.
What we need to know
Photos by email are helpful but not essential. Try to tell us:
- The address or postcode of the job
- Roughly how big the job is
- How we’d reach the joints
- Photos by email, if that is easy
Getting a quote is simple: let us know the job and the location and its rough size. Photos by email help us understand the job, and we will come back to you with a quote.
DIY versus a professional finish
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.
Some jobs are best left to a professional: high-level joints, fire-rated gaps, external movement joints and big jobs call for the right materials, safe access and experience.
What happens on the day
On the day, there’s very little for you to do. Point us to the joints and we will get on with it. The job generally takes a few hours to a few days, depending on the length of joint and the access, including the tidy-up. In a small place like Bulls Cross, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
How to prepare
- Let us know about stairs, lifts or work at height
- Keep children and pets away from the work area
- Mention if the joints have been sealed before
How to get a quote
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or email us and describe the job and send photos if you have them.