Hampshire · England
External Mastic in Purbrook Heath
External mastic in Purbrook Heath from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Rigid filler in a joint that should flex
- Gaps where render, brick and frames meet
- Damp patches traced to an open external joint
What we cannot put right
Sealant isn’t the answer to every problem, and we’d rather say so up front. Sealant won’t put right:
- Damp from another source, such as a leaking gutter or a bridged damp-proof course
- Adding movement joints to masonry that has none
- Failed render or damaged cladding panels
If in doubt, ring 0345 464 0079 or drop us an email and we’ll say what we think.
What we seal
- Copings & trims
- Façade panels
- Concrete & block
- Brickwork movement joints
- Joints between brick and frames
- Render & cladding joints
External mastic in Purbrook Heath
Movement joints let brickwork, render and cladding expand and shrink without cracking. The sealant in it has to stretch and squeeze for years, and when it fails, the wall takes the strain and water finds a way in. Common call-outs are for panel joints letting water in and weeds or debris growing in open joints, across brickwork movement joints, copings & trims and concrete & block.
Somewhere as small as Purbrook Heath, homes and farm buildings often face open ground, so walls and rooflines take the full force of wind and rain. Joints on those walls need a sealant that moves with the building and stays in place.
Each job carries a 12-month guarantee, large or small.
- Place
- Purbrook Heath (PO7)
- Region
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- Quoted before any work starts
- Telephone
- 0345 464 0079
- Page updated
- 26 October 2026
Common questions in Purbrook Heath
Do you cover smaller places like Purbrook Heath?
Yes, smaller places are covered as well as towns. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Do you work for landlords with property near Cosham station?
Yes, we work for landlords and letting agents. Just phone 0345 464 0079 or send us an email and tell us about the property, and we will give you a clear price.
Does someone need to be in?
Access is agreed with you when the job is booked. Indoors, that usually means someone at home.
Where are you based?
We are a Crawley-based firm. Our area covers South East England, London and Scotland.
Why do you put foam in the joint first?
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.
Do you do commercial work?
Yes. Hotels, offices and other businesses use us, and we’re fully insured.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
Can you seal joints between render and window frames?
Yes. Materials like render, brick, metal and uPVC all move differently, so a flexible sealant is needed where they meet. The sealant is matched to both sides.
Why it’s worth doing now in Purbrook Heath
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That protects surfaces like brick, render and concrete. A stiffer product can damage the joint edge as it fails. In a small place like Purbrook Heath, homes can be exposed to wind and rain, which finds any gap, and older walls, once damp, take a long time to dry.
Some things make a job bigger or smaller: how much old sealant there is and how stubborn it is, any mould to treat, and whether we need extra access for height. Your quote takes all of that into account.
Why book with us
- Old sealant always removed completely
- 180+ five-star Google reviews
- Over 20 years’ experience
- White, clear, grey or coloured to suit, where the product allows
Read our cost guide or our reviews.
Walls and rooflines in Purbrook Heath
Purbrook Heath is within about 2 miles of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on movement joints and outside wall joints, especially on the side facing the sea. Rainfall in the South East is lower than in much of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast.
Rented homes near Cosham station change hands often, and failed wall and movement joints let damp in, so they’re worth checking between tenancies. For site and facilities teams at buildings such as Purbrook Junior School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Purbrook Heath is about 1 mile west of Purbrook, in Hampshire. Our applicators cover external mastic for householders, landlords and businesses in Purbrook Heath and nearby. Purbrook Heath is one of 683 places in Hampshire we cover.
Here we cover the PO7 postcode area for external mastic. If you need external mastic at a property on Newlands Lane and Purbrook Heath Road or anywhere close by, our applicators can take on the job. We also cover Widley (1 mile south), Purbrook (1 mile east), Waterlooville (1 mile north-east), Furzeley Corner (2 miles north) and Drayton (2 miles south). Larger places within reach include Gosport (6 miles south-west), Havant (3 miles east), Eastleigh (14 miles north-west), Fareham (6 miles west), Horndean (3 miles north-east) and Hedge End (11 miles west).
Near you in Purbrook Heath
We work in homes and buildings around George Inn and Purbrook Park School, among other places. Purbrook Heath’s nearest station is Cosham station, roughly 1.9 miles south of the centre. Other landmarks nearby include Queen Alexandra Hospital (1.3 miles south-west) and Portchester Castle (3.4 miles south-west). Not far away are Southmoor Nature Reserve and Portsdown Hill.
How it works
There isn’t much for you to do on the day. Point us to the joints and we’ll get on with it. The job generally takes anything from a few hours to several days, depending on the building from start to finish. In a small place like Purbrook Heath, access is usually the main thing to plan. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- First, the joints are inspected and the access agreed.
- Every bit of old sealant and any mortar or debris is cut out.
- Joint faces are cleaned back and primed if the sealant needs it.
- We fit closed-cell backing rod to control the depth.
- The exterior sealant is applied, tooled and checked along its length.
Preparing for the visit
- Keep pets and children clear of the area while we work
- Mention any tricky access
- Clear items away from the joints we are working on
Getting a quote
Want a quote for external mastic? Please ring 0345 464 0079 or send us an email and tell us about the job. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Do you need external mastic in Purbrook Heath?
Using the wrong sealant is another common reason. A high-modulus or general-purpose sealant can be too rigid for a busy joint, so it pulls away from the edges.
These are the problems we’re asked about most:
- Panel joints letting water in
- Rigid filler in a joint that should flex
- Old sealant gone brittle and cracked
- Rain getting behind render or cladding at a joint
For an older house near a landmark such as Church of St John, old and new materials meet at the roofline and walls, which is where sealant earns its keep.
Before booking anyone
- How hidden problems are handled
- Whether VAT is included
- How the colour is chosen
- Who turns up on the day
How the job changes by surface
Brickwork movement joints
Brick movement joints are often mistaken for a missing mortar line. If that is happened, we rake it out and reseal it properly if the joint can be cleared.
Render joints
Water behind render can lead to blown patches. A sound joint keeps the render dry behind.
Also near Purbrook Heath
Also in Purbrook Heath
Aftercare tips
To keep the joints looking good and working properly:
- Avoid pressure-washing directly into sealant joints
- Clear growth from the base of walls and joints
- Show decorators and builders where the movement joints are
- Check the sealant is paintable before painting near it
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants are not designed to be painted and spoil the finish.
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.
Landlord and commercial work in Purbrook Heath
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.