Hampshire · England
External Mastic in Petersfield
Sealing brickwork movement joints, render, cladding and façade joints for homeowners, landlords and businesses in Petersfield. Fully insured, ARBOMaster approved and guaranteed for a year.
- Rigid filler in a joint that should flex
- Weeds or debris growing in open joints
- Old sealant gone brittle and cracked
External mastic in Petersfield, done properly
Where two different materials meet, such as brick and render or blockwork and metal, they move at different rates. A flexible exterior sealant takes up that movement where a rigid filler would soon crack. We work on façade panels, brickwork movement joints and copings & trims, and people most often call us about joints with sealant missing in places and gaps where render, brick and frames meet.
Extensions are a common sight on houses around Petersfield, and the joint where new wall meets old is a classic place for water to get in. Getting the joint depth right matters as much as the sealant itself.
We stand behind the work with a one-year guarantee, so you are covered after we have gone.
- Location
- Petersfield (GU31, GU32)
- Region
- Hampshire
- Guarantee
- One year on every job
- Quote
- Quoted before any work starts
- Phone
- 0345 464 0079
- Updated
- 26 October 2026
Landlord and commercial work in Petersfield
For anyone letting property in or around Petersfield, several properties can go on one quote. Just tell us the addresses and what each one needs.
We also work for property managers and facilities teams in Petersfield and across Hampshire. We can quote a run of properties together, and we are fully insured for the work.
Also in Petersfield
Do you need external mastic in Petersfield?
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, and it tears off the sides.
Most people get in touch when they notice one of these:
- Weathered mastic that no longer stretches
- Brick movement joints where the sealant has split
- Rain getting behind render or cladding at a joint
- Joints where the bead has come unstuck
If you live in an older home near St Peter's Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
What your quote should include
- Whether all the old sealant comes out first
- What product goes in the joint
- How long the guarantee is
- Whether they’re fully insured
Honest limits
We will always be straight with you, so here’s what sealant cannot fix:
- Render that’s blown, hollow or coming away
- Adding movement joints to masonry that has none
- Movement that is more than a sealant joint can take
Not sure which it is? You can call 0345 464 0079 or drop us an email and we will tell you honestly before you book.
Surfaces we seal
- Brickwork movement joints
- Joints between brick and frames
- Concrete & block
- Render & cladding joints
- Façade panels
- Copings & trims
Questions from Petersfield
Do you cover Petersfield for external mastic?
Yes. We work across London and the South East, and Petersfield is part of that. You can ring 0345 464 0079 or drop us an email and let us know what needs doing, and we’ll give you a clear price.
Is there a guarantee on external mastic in Petersfield?
All our work, in Petersfield and everywhere else, comes with a 12-month guarantee. We’re fully insured, and an ARBOMaster approved applicator.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
Do you do commercial work?
Yes, regularly. Larger jobs can be planned room by room or area by area to suit the site.
Will it make a mess?
We keep the work tidy. We protect what’s around the joints.
I’m a tenant. Can you help?
Yes, but check with your landlord or agent first. Many landlords are glad to have it sorted.
What does external mastic cost?
Size, access and the old material all affect the cost. Call for a quick quote and we will talk you through it.
How long does external mastic last?
It varies with how exposed the wall is and how much the joint moves. Signs to watch for are cracking, hardening and gaps at the edges, and reseal at that point.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
What a professional job adds is preparation and the right product. Joints are cleaned back to sound surfaces and dried, and the sealant is chosen for how the joint moves and where it is, then guaranteed for a year.
Outside joints around Petersfield
Rainfall in the South East is lower than in much of the UK, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind. Historic houses like Uppark (about 4.1 miles south-east) are a reminder that the area around Petersfield has older buildings as well as new. Where a home is older, older walls and rooflines need a sealant that moves with them and suits the material.
If you let a flat or house near Petersfield station, split movement joints are easy to miss on a rental until damp shows inside. For site and facilities teams at buildings such as Petersfield Infant School, movement joints, cladding joints and gutters on larger buildings need the same care as a house’s.
Petersfield is about 10 miles north of Havant, in Hampshire. Petersfield gets the same service as everywhere we cover: old sealant removed completely, careful preparation and a one-year guarantee. Across Hampshire, we cover 683 places, Petersfield among them. Our Portsmouth page covers work nearby.
Work in GU31 and GU32 works the same way as everywhere else we cover. Streets in the area include High Street, Station Road and London Road, and we cover them all. Petersfield sits on or near the A3 and A272, which makes travel easy. Other places close to Petersfield include Sheet (1 mile north-east), Steep (1 mile north), Stroud (2 miles west), Steep Marsh (2 miles north) and Langrish (3 miles west). Further out, we also cover Havant (10 miles south), Horndean (7 miles south-west), Alton (10 miles north), Waterlooville (9 miles south-west), Purbrook (10 miles south-west) and Bordon (8 miles north-east).
Near you in Petersfield
In Petersfield, that means homes and buildings near The Petersfield School, The White Hart pub and Morton House School. There’s a railway station in Petersfield itself: Petersfield station. Well-known places in the area include Bear Museum (less than half a mile south) and Petersfield Community Hospital (less than half a mile west). Green spaces nearby include Wheatham Hill and Liss Riverside Railway Walk South.
What we do, step by step
You do not need to clear the whole room or building, just the space around the work. Everything nearby is protected, and the work takes a few hours to a few days, depending on the length of joint and the access for a typical job. For a job in Petersfield, we need access to where the work is and somewhere nearby to park. If the job is outside, mention gates, side access and anything above ground floor.
- We inspect the joints and agree which need resealing and how they’ll be reached.
- 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.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Preparing for the visit
- Let us know about stairs, lifts or work at height
- Clear the area around the work
- Keep children and pets away from the work area
Get a quote
Need a quote? Please ring 0345 464 0079 or email us with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
Surface by surface
Render joints
Rendered walls have joints at beads, openings and changes of material. They’re resealed in a sealant that suits the render.
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. We reseal their joints with backing rod and a flexible product.
Why act early in Petersfield
A properly done movement joint is an even line in a colour that suits the wall. A rushed bead with no backing looks untidy and does not last, so it pays to do it properly once. Gaps in sealant and mould in the bead never get better on their own, and in a busy household in Petersfield they spread with every shower and every downpour. Now is the easy time to put it right.
Every job is a little different, so each one gets its own quote. Size, access and the product the joint needs all make a difference, and we’ll explain the quote if you ask.
Why book with us
- Approved under the ARBOMaster scheme
- Tidy, careful work
- You choose the colour before work begins
- Trusted Arbo and Everbuild sealants
Take a look at our cost guide or our reviews.