Hertfordshire · England
External & façade joints in Croxley Green, Hertfordshire
Problem with your movement joints in Croxley Green? We cut out the old, prepare the joints and apply the right sealant, with a one-year guarantee.
- Movement joints filled with mortar instead of sealant
- Rain getting behind render or cladding at a joint
- Moss and dirt in joints with no sealant left
About our external mastic in Croxley Green
Ground-floor and low-level joints are straightforward to reach. For joints higher up, give us some details of the building and we’ll confirm what access is needed. We work on concrete & block, façade panels and render & cladding joints, and common reasons people get in touch are sealant that has lost its bond to the brick or render and weeds or debris growing in open joints.
External sealant needs dry, clean surfaces, so work around Croxley Green is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Every job is covered by our 12-month guarantee, wherever you are in Hertfordshire.
- Place
- Croxley Green (WD3, WD18)
- Region
- Hertfordshire
- Guarantee
- 12 months on all our work
- Quotes
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Keeping the joints in good condition
Simple care keeps the joints in good condition. Our advice:
- Wash walls gently around the sealant
- Fix overflowing gutters above sealed joints
- Tell anyone working on the walls about the movement joints
- Keep soil, plants and ivy away from the joints
Keep the joints clear of soil, plants and climbing growth. Damp material against the sealant shortens its life.
Gaps, plants or missing sealant in a joint are worth getting looked at. Early work is quicker and leaves a better finish.
Why deal with it now?
Resealing a run of joints in one go is generally better than patching one at a time. They’ve weathered the same way. Where a wall is exposed, as many are in small places like Croxley Green, wind-driven rain gets into any failed joint, and older walls, once damp, take a long time to dry.
Doing several joints on one visit usually 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 you get with us
- Full insurance on every job
- White, clear, grey or another colour, product permitting
- More than 20 years in sealant work
- 4.9 on Google from 180+ five-star reviews
Take a look at how sealant jobs are priced and customer reviews.
How we quote for external mastic
You will get a clear quote before any work starts. It’s based on:
- How much there is to do
- How much old sealant there is and how hard it is to remove
- The number of rooms or windows
- Any mould that needs treating
What you pay reflects the work, not guesswork. That’s why we ask a few questions first.
What we need to know
The more you tell us, the more accurate the quote. When you get in contact, it helps to mention:
- Roughly how big the job is
- What’s wrong with the joints now
- Where the job is, and your postcode
- Whether it’s a home or a business
Every job is quoted individually, so start by telling us what you need. Simply call 0345 464 0079 or drop us an email and describe the job and send photos if you have them.
Croxley Green buildings and the weather
Historic houses like Chenies Manor House (about 4.2 miles north-west) are a reminder that the area around Croxley Green has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material. 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 the older streets around St Oswald's Parish Church, older walls, gutters and the joints where extensions meet them need a flexible sealant. Rented homes near Rickmansworth station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Croxley Green is about 1 mile north-east of Rickmansworth, in Hertfordshire. Jobs in Croxley Green get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 381 towns and villages across Hertfordshire, from the larger towns to small villages. We also work in London, about 18 miles from Croxley Green.
Postcode districts we cover here for external mastic: WD3 and WD18. Whether your property is on New Road, Harvey Road and Bateman Road or anywhere close by, we can help. We also cover the places around Croxley Green: Holywell (1 mile east), Rickmansworth (1 mile south-west), Batchworth (1 mile south-west), Chorleywood West (2 miles west) and Moor Park (2 miles south). Within a short drive, we also cover Hemel Hempstead (7 miles north), St Albans (9 miles north-east), Welwyn Garden City (15 miles north-east), Harpenden (12 miles north), Hatfield (12 miles north-east) and Borehamwood (7 miles east).
What’s near Croxley Green
Around Croxley Green, our work takes us to homes and buildings near Croxley Danes School, Rickmansworth School and The Red House and the streets around them. For rail, the closest station is Rickmansworth station, about 1.3 miles west of the centre. Other landmarks nearby include Hertfordshire Fire Brigade Museum (2.4 miles east) and Hilfield Castle (4.7 miles east). Green spaces nearby include Chorleywood Common and Tumbling Bay.
The process
Most of a good job is in the preparation, so that’s where we spend the time. Joints are cleaned back and dried before anything new goes in. In total, it normally takes anything from a few hours to several days, depending on the building. For a village or hamlet like Croxley Green, the journey is planned in advance: 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 we look over the joints with you, agree which to renew and talk through access.
- We cut out the failed sealant and rake out any dirt or growth.
- Both sides are cleaned back to sound material and primed if needed.
- Closed-cell backing rod is fitted to set the depth and stop three-sided bonding.
- A flexible exterior sealant is applied and tooled in a colour to suit the wall.
Getting ready for the visit
- Mention any tricky access
- Keep children and pets away from the work area
- Let us know if you’ve seen damp or leaks
How to get a quote
Getting a quote is simple: let us know the job and the location and its rough size. A few photos by email make the job easier to understand, and we will come back to you with a quote.
Related advice
What we’re called out for in Croxley Green
Buildings move more than people expect. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
Keep an eye out for any of the following:
- Old sealant gone brittle and cracked
- Gaps where render, brick and frames meet
- Joints where the bead has come unstuck
- Plants rooting in failed movement joints
If you look after a building such as Harvey Road Primary School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before you book
- Which colour the sealant will be
- What happens if they find a problem under the old sealant
- Who turns up on the day
- Are they insured?
Landlord and commercial work in Croxley Green
If you manage several properties in or around Croxley Green, jobs at different addresses can be quoted together. Send us the addresses and the work at each, and pictures by email help.
We work for landlords and agents as well as householders. Resealing between tenancies is a simple way to keep a property in good order.
Nearby places to Croxley Green
Also in Croxley Green
Common questions in Croxley Green
Can you help a landlord with a rental near Rickmansworth station?
Yes, rental work is part of what we do. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear quote.
Do you cover smaller places like Croxley Green?
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.
Do you work at height?
That depends on the building and the joints. Where joints can be reached safely, we’ll do them. Give us some details and we will confirm the access.
Do you remove the old sealant?
Yes. We cut out all the old sealant and clean the joint.
Should I try DIY first?
That depends on the joint. High-level, external movement and fire-rated joints are professional jobs, while a short indoor joint may be within reach.
Is it messy?
No. We protect the surfaces around the joints, and we tidy up before we go.
Why is there a gap in my brick wall?
It’s a deliberate gap that lets the wall expand and contract without cracking. It’s sealed with a flexible sealant, not mortar.
Can you work on commercial sites?
Yes. We work in offices, washrooms, hotels and other commercial premises, as well as homes. Working times can be discussed when we quote.
What the job involves on each surface
Render joints
The face of render can be soft, so a low-modulus sealant is kinder to the joint edges. We prime where the product needs it.
Copings and trims
Joints in copings, parapets and trims are exposed to the worst of the weather. Each is resealed with a weatherproof, flexible sealant.