Hampshire · England
Forton External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Forton and across Hampshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Plants rooting in failed movement joints
- Rigid filler in a joint that should flex
- Weathered mastic that no longer stretches
External mastic in Forton
We cut out failed sealant, set the joint depth with closed-cell backing rod and reseal with a low-modulus exterior sealant. The colour is chosen to suit the brick or render so the line blends in. We work on concrete & block, render & cladding joints and façade panels, and the jobs we see most are hard, crazed mastic that has stopped moving and joints with sealant missing in places.
In and around Forton, older properties sit alongside newer ones, each with its own outside joints. Older homes need their gutter and trim joints kept tight, newer ones their movement joints.
You are covered for a year from the day we finish. If anything isn’t right with it, phone 0345 464 0079 or send us an email.
- Where
- Forton (PO12, PO13)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quote
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Your questions about external mastic in Forton
Will you come out to Forton?
Yes. Forton is within the area we cover, which takes in towns, villages and rural addresses. Our work covers London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you help a landlord with a rental near Portsmouth Harbour station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before work begins.
Can you seal joints between two different materials?
Yes. Materials like render, brick, metal and uPVC all move differently, so the joint between them must be flexible. We choose one that suits both surfaces.
What should I tell you?
A short description and the location, plus pictures if you have them. We’ll ask anything else we need to know.
Are you ARBOMaster approved?
Yes. We are an ARBOMaster approved applicator, the approved applicator scheme for Arbo sealants.
Is it OK to fill a movement joint with cement?
No. Rigid materials can’t move with the wall, so the joint stops doing its job. Where a joint has been mortared, it can often be raked out and sealed properly.
Do you guarantee your work?
Yes, for a year. If anything isn’t right with the work within the year, let us know and we will sort it.
How long will you be here?
It depends on the size of the job, but as a guide it takes a few hours to a few days, depending on the length of joint and the access. We will tell you when we quote.
What we can’t put right
Some problems need a builder, plumber or other trade rather than us:
- Failed render or damaged cladding panels
- Movement that’s more than a sealant joint can take
- Cracked brickwork or render that needs a builder or plasterer
If you’re not sure, just call 0345 464 0079 or email us and we’ll give you a straight answer.
Where we work in Forton
- Render & cladding joints
- Joints between brick and frames
- Façade panels
- Brickwork movement joints
- Concrete & block
- Copings & trims
How the visit works
We bring everything the job needs with us. Once we’ve agreed what’s being done, we protect the area and start. It normally takes anything from a few hours to several days, depending on the building. Parking around Forton is usually easier than in a town centre, but mention any lanes, gates or long drives. For outside work, side access and the height of the joints help us plan.
- First, the joints are inspected and the access agreed.
- We cut out the old mastic and rake out anything in the joint.
- The faces are brushed clean and primed where the product requires it.
- We fit closed-cell backing rod to control the depth.
- We apply the sealant, tool it and check the whole run.
Getting ready for the visit
- Tell us about any previous sealing or DIY attempts
- Mention any sign-in or site rules at work premises
- Mention any parking rules near the property
Get a quote
Every job is quoted individually, so the first step is telling us about yours. Simply phone 0345 464 0079 or email us and describe the job.
Read more
Different surfaces, different methods
Copings and trims
Coping joints that leak let water straight down into the wall. Sealing them early saves the wall below.
Render joints
Render has movement joints and stop beads that need sealing. We reseal them with a flexible exterior sealant that suits the render colour.
What we’re called out for in Forton
A lot of failed joints come down to preparation: joint faces that were dusty or damp, unprimed where they needed it, or still carrying old sealant. The sealant never bonds properly.
These are the problems we are asked about most:
- Damp patches traced to an open external joint
- Weeds or debris growing in open joints
- Leaking joints around cladding and façade panels
- Rigid filler in a joint that should flex
Managing a site like St Mary's Catholic Primary School? Then movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Questions to ask before booking
- Are they insured?
- Who turns up on the day
- Whether they seal over old material or remove it
- How the joint is cleaned and prepared
Landlord and commercial work in Forton
Landlords and agents in Forton can book us as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
We regularly work with letting and managing agents. Send the address, what’s needed and the access arrangements.
Why deal with it now?
Running new sealant over the old bead rarely lasts. New sealant does not bond well to old, weathered sealant, so we always take the old sealant out. In a smaller place like Forton, wherever a wall is exposed, a failed outside joint is a real source of damp. Indoors, a failed seal lets water into floors and panels as it would anywhere.
We do not show prices on the website, because the cost depends so much on the job itself. Call for a quick quote and we will talk you through it.
Why choose Mr Mastic in Forton
- Old sealant always removed completely
- Colour agreed with you before work begins
- Over 20 years’ experience
- Sealant colour chosen to suit
Also near Forton
What else we do in Forton
Looking after it afterwards
Once the sealant has cured, a few habits help it last:
- Walk round the building once a year and look at the joints
- Keep water from gutters off the wall
- Point out the joints to other trades
- Never let anyone fill a movement joint with mortar
Don’t let soil, plants or ivy build up against the new joints. Damp material against the sealant shortens its life.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
Outside joints around Forton
Forton is close to the coast, and homes near the sea take more wind-driven rain, with salt in the air closer to the shore. That is hard on movement joints and outside wall joints, especially on the side facing the sea. London and the South East are among the drier parts of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day.
Homes close to St John the Evangelist include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant. If you let a flat or house near Portsmouth Harbour station, split movement joints are easy to miss on a rental until damp shows inside.
Forton is about 1 mile south-east of Gosport, in Hampshire. We provide external mastic to householders, landlords and businesses in Forton. Across Hampshire, we cover 683 places, and Forton is one of them.
Jobs for external mastic in PO12 and PO13 works the same way as everywhere else we cover. That includes homes and businesses on Lee Road, Ford Road and Lees Lane. Neighbouring places we cover for external mastic include Gosport (1 mile north-west), Priddy's Hard (1 mile north-east), Elson (1 mile north), Bridgemary (2 miles north-west) and Rowner (2 miles north-west). Within a short drive, we also cover Havant (8 miles north-east), Eastleigh (15 miles north-west), Fareham (4 miles north-west), Horndean (9 miles north-east), Hedge End (11 miles north-west) and Waterlooville (7 miles north-east).
Local landmarks in Forton
Around Forton, our work takes us to homes and buildings near The Trafalgar pub, Brune Park Community School and St Vincent College and the streets around them. The closest station to Forton is Portsmouth Harbour station, roughly 1.5 miles east. Well-known places in the area include Portchester Castle (2.8 miles north-east) and Gosport War Memorial Hospital (0.6 miles south-west). The countryside around Forton includes West of the River Alver and Portsdown Hill.