West Sussex · England
External Mastic in Dial Post
External mastic for Dial Post and the surrounding area: careful preparation, the right product and tidy work. Call for a quick quote.
- Joints with sealant missing in places
- Sealant that has lost its bond to the brick or render
- Rigid filler in a joint that should flex
Walls and rooflines in Dial Post
London and the South East are among 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 Dial Post, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Dial Post is about 7 miles south of Horsham, in West Sussex. For external mastic in and around Dial Post, it’s easy to get a quote: please ring 0345 464 0079 or email us. We are based in Crawley and cover West Sussex, Dial Post included. Our West Sussex coverage runs to 371 places, and Dial Post is one of them. We also work in Crawley, around 13 miles away.
All of RH13 is covered for external mastic. Streets in the area include The Green, Swallows Lane and Bentons Lane, all of which we cover. If you are just outside Dial Post, we cover Whitehall (2 miles north-west), Shipley (2 miles north), West Grinstead (2 miles north-east), Broomer's Corner (2 miles north-west) and Partridge Green (2 miles east). We also work in nearby towns such as Crawley (13 miles north-east), Horsham (7 miles north), Worthing (10 miles south), Haywards Heath (12 miles east), Burgess Hill (10 miles east) and Littlehampton (13 miles south-west).
What’s near Dial Post
For a walk, there’s Knepp Wildland and Chanctonbury Hill.
External mastic for homes and businesses in Dial Post
A movement joint is only as good as its depth. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, so it bonds to the two sides only and can stretch. If you are dealing with old sealant gone brittle and cracked and gaps where render, brick and frames meet, we can help, whatever the surface.
Outside joints can only be sealed when they’re dry, so work in Dial Post is booked around the forecast. Tell us about access to all sides of the building, including outbuildings and garages.
We stand behind the work with a one-year guarantee.
- Place
- Dial Post (RH13)
- Wider area
- West Sussex
- Cover
- One year on every job
- Quotes
- A clear price before we start
- Telephone
- 0345 464 0079
- Updated
- 26 October 2026
Aftercare tips
Looking after new joints is easy:
- Wash walls gently around the sealant
- Get split or bare joints resealed while the damage is small
- Keep water from gutters off the wall
- Check the sealant is paintable before painting near it
Avoid pressure-washing straight into the joints. A strong jet can damage the edges of the bead and let water in behind.
Water getting behind cladding or render can go unnoticed for a long time. By the time there’s a damp patch, the damage can be well established so early resealing is worth it.
What else we do in Dial Post
How it works
Most of a good job is in the preparation, and we don’t rush it. Joints are cleaned back and dried before anything new goes in. All told, the work takes anything from a few hours to several days, depending on the building. For a village or hamlet like Dial Post, the journey is planned in advance: let us know about lanes, gates and parking. Everything for the job comes with us, so a second trip is avoided where possible.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- A low-modulus exterior sealant is gunned in and tooled to a neat finish.
Before we arrive
- Clear the area around the work
- Where the joints are inside, avoid wetting them before we arrive
- Tell us about access, such as stairs, a lift or high-level joints
Ask for a quote
It all starts with a short chat. Tell us what’s wrong, where it is and how much there is, and we’ll talk you through what we’d do. Whenever you’re ready, ring 0345 464 0079 or send us an email.
Advice
Different surfaces, different methods
Copings and trims
Coping and trim joints face rain and sun head on. We reseal them with an exterior sealant suited to the material.
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Common problems we fix in Dial Post
Poor preparation causes many early failures: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
Signs it’s time to call us include:
- Panel joints letting water in
- Failed seals between different materials
- Joints pointed up with cement by mistake
- Moss and dirt in joints with no sealant left
For jobs in and around Dial Post, choosing the right material for each joint is as important as a tidy finish.
Questions to ask before booking
- How much experience the applicator has
- Are they insured?
- What preparation is included
- When the joint can take water or movement
Questions from Dial Post
Will you come out to Dial Post?
Yes, Dial Post is covered. We work across London and the South East, from towns to the smallest places. Longer journeys are simply planned in advance.
Do you cover Dial Post for external mastic?
Yes. We work across London and the South East, and Dial Post is part of that. You can phone 0345 464 0079 or drop us an email and let us know what needs doing, and we will send you a clear quote.
Will the old sealant be removed?
Yes. All of the old material is cut out and the joint cleaned before resealing.
Can you quote for more than one area?
Yes, and it often makes sense. Combining jobs makes good use of the visit.
Are you insured?
Yes. We’re fully insured.
Can tenants book the work?
Yes. Ask your landlord first, and we can send them the quote if that helps.
How long before the joint can be used?
It depends on the product and the temperature. Before we leave, we will tell you the cure time.
Do you work for landlords and businesses?
Yes, regularly. We can quote for several properties at once, and between tenancies is a good time for the work.
Why deal with it now?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. Too stiff a sealant can pull at the edges and break them. In a small place like Dial Post, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Leaving a failed joint generally makes the job bigger, not smaller, as water and mould keep getting in. If you’re unsure, ring 0345 464 0079 or send us an email for an honest opinion and a quote.
Why us?
- Colour agreed with you before work begins
- 4.9 on Google from 180+ five-star reviews
- A choice of colours where the product allows
- We leave the area clean and tidy
Take a look at our cost guide or customer reviews.
DIY sealant or a professional job?
A DIY attempt does not rule out a professional job. We remove it and do the joint properly, so just mention it when you contact us.
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
Work for landlords, hotels and businesses
We also work for property managers and facilities teams in Dial Post and across West Sussex. Several sites can go on one quote.
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.