West Sussex · England
External Mastic in Colgate
We cover Colgate for sealing brickwork movement joints, render, cladding and façade joints. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Movement joints with cracked, split or missing sealant
- Rain getting behind render or cladding at a joint
- Failed seals between different materials
How we handle external mastic in Colgate
Low-level joints can usually be done from the ground. For joints higher up, give us some details of the building and we will confirm what’s needed to reach them safely. If you have movement joints filled with mortar instead of sealant and plants rooting in failed movement joints, we can help.
External sealant needs dry, clean surfaces, so work around Colgate is planned for dry weather. Let us know about access to every wall, plus any garages or outbuildings.
Whatever the size of the job, you get the same 12-month guarantee.
- Where
- Colgate (RH13, RH12)
- Region
- West Sussex
- Cover
- A year, on every job
- Quote
- Quoted before any work starts
- Call
- 0345 464 0079
- Last updated
- 26 October 2026
Surface by surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Concrete and blockwork
Concrete faces can be dusty and porous, so preparation is key. A primer goes on where the product requires one before sealing.
Aftercare tips
No joint lasts for ever, but care makes a real difference. Our tips:
- Point out the joints to other trades
- Wash walls gently around the sealant
- Fix overflowing gutters above sealed joints
- Get split or bare joints resealed while the damage is small
Look over the joints once a year, ideally after winter. Watch for splits, edges coming away or growth in the joint.
If you can see gaps, plants or bare sections in a joint, have it checked. Earlier resealing means a smaller job and a better result.
What happens on the day
Our applicators work methodically: protect, prepare, seal, tidy. Typically it takes a few hours to a few days, depending on the length of joint and the access. In a small place like Colgate, access is generally the main thing to plan. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at every joint and agree a colour to suit the wall.
- We take out the old sealant until the faces are sound.
- 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.
How to prepare
- Mention any parking rules near the property
- Let us know if you’ve seen damp or leaks
- Let us know about earlier repairs to the joints
Getting a quote
Every job is quoted individually, so start by telling us what you need. Simply ring 0345 464 0079 or drop us an email and describe the job and send photos if you have them.
Advice
For landlords and businesses
Housing providers, facilities teams and property managers book us too. We can quote a run of properties together, and we’re fully insured for the work.
Hotels need rooms back in use, so the work can be planned room by room around your bookings where we can. We have worked in hotels as well as homes and businesses.
What we cannot put right
New sealant cannot fix everything, and we will tell you before any work starts. It won’t solve:
- Adding movement joints to masonry that has none
- Failed render or damaged cladding panels
- Cracking across the wall rather than at a joint
If you are not sure, just call 0345 464 0079 or drop us an email and we will give you a straight answer.
Where we work in Colgate
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Façade panels
- Concrete & block
- Copings & trims
How we quote for external mastic
You’ll get a clear quote before we start. It’s based on:
- Working hours on commercial sites
- Whether the work is at height
- The number of rooms or windows
- Whether there’s mould to deal with
Instead of a standard rate, we look at what your job involves: how many joints, what’s in them now and how we reach them. You will know the price before we begin.
Asking for a quote
There’s no need for technical detail. Just tell us:
- Photos by email, if that’s easy
- If someone has resealed it before
- Where the property is
- Whether it’s a home or a business
A good description makes for an accurate quote. Tell us where the job is, what’s wrong and how much there is.
Also near Colgate
Also in Colgate
What external mastic looks like in Colgate
The South East is one of the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. Historic houses like Tyes Place (about 4.5 miles south-east) are a reminder that the area around Colgate has older buildings as well as new. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth.
If you look after a building such as Colgate Primary School, its movement joints, gutters and trims need looking after like any other building’s. For an older house near a landmark such as St. Saviour's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Colgate is about 3 miles south-west of Crawley, in West Sussex. Whether you’re in the middle of Colgate or further out, we cover external mastic for every kind of property. Colgate is one of 371 places in West Sussex where we work for external mastic.
Every address in RH13 and RH12 is within our area for external mastic. You will find streets such as Forest Road, Vicarage Close and Blackhouse Road. Nearby, we also carry out external mastic in Kilnwood Vale (1 mile north), Faygate (1 mile north-west), Broadfield (2 miles north-east), Roffey (2 miles west) and Handcross (3 miles south-east). Within a short drive, we also cover Crawley (3 miles north-east), Horsham (4 miles west), Haywards Heath (9 miles south-east), Burgess Hill (10 miles south-east), East Grinstead (11 miles east) and Storrington (14 miles south-west).
Near you in Colgate
We work in homes and buildings around The Dragon pub, Target Hill Park and Cottesmore School, among other places. The nearest railway station is Faygate station, about 1.3 miles north-west of the centre. Nearby you’ll also find Crawley Museum (3.4 miles north-east) and County Mall (3.4 miles north-east). The countryside around Colgate includes Tilgate Lake and Warnham LNR.
What we are called out for in Colgate
If plants are growing out of a joint, the sealant has usually failed or was never there. Dirt and roots then trap moisture in the joint.
It’s worth asking for a quote if you see:
- Moss and dirt in joints with no sealant left
- Water getting into walls through failed joints
- Weathered mastic that no longer stretches
- Joints where the bead has come unstuck
Rented homes near Faygate station change hands often, and split movement joints are easy to miss on a rental until damp shows inside.
Before you book anyone
- What product goes in the joint
- Whether they seal over old material or remove it
- How long the guarantee is
- How the surfaces are prepared before sealing
Questions from Colgate
Is Colgate in your area for external mastic?
Yes. Our work covers London and the South East, and Colgate is part of that. Just phone 0345 464 0079 or send us an email with a few details of the job.
Is Colgate within the area you cover?
Yes, we do. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Should I try DIY first?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Are you ARBOMaster approved?
Yes. We hold ARBOMaster approved applicator status.
What should I tell you?
Tell us what needs doing and where, with photos by email if possible. If we need more, we will ask.
Do you guarantee your work?
Yes. All our work carries our 12-month guarantee.
Do you use backing rod?
Backing rod controls the sealant depth and keeps it off the back of the joint. Then the sealant bonds to two faces and can move.
What does external mastic cost?
It depends on the job, so we quote each one individually. For a quick quote, phone 0345 464 0079 or drop us an email and let us know what needs doing and where.