Hampshire · England
Trotton Marsh External Mastic
Sealing brickwork movement joints, render, cladding and façade joints for Trotton Marsh, backed by a one-year guarantee. Ask us for a quote.
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Panel joints letting water in
When it is not the sealant
We’ll always be straight with you, so here’s what new sealant will not do:
- Movement that is more than a sealant joint can take
- Damp that is not coming from the joint
- Loose or hollow render, which needs re-rendering
If in doubt, ring 0345 464 0079 or email us and we’ll say what we think.
Joints and surfaces we work on
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
- Copings & trims
- Brickwork movement joints
- Façade panels
External mastic in Trotton Marsh, done properly
Getting the depth right is half the job. Backing rod controls how deep the sealant goes and keeps it off the back of the joint, so it bonds to the two sides only and can stretch. We’re often asked to deal with damp patches traced to an open external joint and sealant pulling away from one side of the joint, across brickwork movement joints, joints between brick and frames and façade panels.
Somewhere as small as Trotton Marsh, 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.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we’ll sort it.
- Place
- Trotton Marsh (GU30, GU31)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
No joint lasts for ever, but care makes a real difference. A few tips:
- Look over the joints every year, ideally after winter
- Check the sealant is paintable before painting near it
- Get split or bare joints resealed while the damage is small
- Tell anyone working on the walls about the movement joints
Keep pressure washers away from the sealant. High-pressure water can lift the edges over time.
A joint that has stopped moving pushes the movement elsewhere, normally as cracking in the brickwork or render nearby. Resealing it early helps prevent that.
Do you need external mastic in Trotton Marsh?
Every building moves. Clay bricks expand slightly over their life, concrete and block shrink, and everything moves with temperature and wet. The sealant in the movement joints takes that strain.
The problems people generally mention when they call are:
- Joints pointed up with cement by mistake
- Movement joints with cracked, split or missing sealant
- Sealant that has lost its bond to the brick or render
- Rain getting behind render or cladding at a joint
Cowdray House, about 4.2 miles south-east, is one of the historic houses in the wider area around Trotton Marsh, and older homes nearby need a sealant that suits their walls.
Before booking anyone
- Whether VAT is included
- What preparation is included
- What happens if they find a problem under the old sealant
- What the cure time is
How the visit works
When we get to you, we check the joints match what you told us. If we find something unexpected, we talk it through with you first. Most jobs then take anything from a few hours to several days, depending on the building. Somewhere as small as Trotton Marsh, access is often the only tricky part. If the job is outside, mention outbuildings, exposed walls and how to reach them.
- We start by walking round the building and agreeing the joints and the access.
- 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.
- We apply the sealant, tool it and check the whole run.
How to prepare
- Try not to wet indoor joints just before the visit
- Let us know about parking restrictions
- Clear items away from the joints we’re working on
Ask for a quote
For external mastic in Trotton Marsh, call 0345 464 0079 or email us. Tell us what the problem is and where, and you will get a clear quote before we start.
Read more
Also in Trotton Marsh
Different surfaces, different methods
Copings and trims
A failed coping joint lets water into the top of the wall. Resealing them is a small job that protects a lot.
Render joints
Render has movement joints and stop beads that need sealing. They’re resealed in a sealant that suits the render.
What external mastic looks like in Trotton Marsh
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. Historic houses like Cowdray House (about 4.2 miles south-east) are a reminder that the area around Trotton Marsh has older buildings as well as new. In older buildings, older walls and rooflines need a sealant that moves with them and suits the material.
Letting a property close to Liphook station? Then split movement joints are easy to miss on a rental until damp shows inside.
Trotton Marsh is about 5 miles east of Petersfield, in Hampshire. For external mastic in and around Trotton Marsh, please ring 0345 464 0079 or email us for a quick quote. We cover Hampshire from our Crawley base. Trotton Marsh is one of 683 towns and villages in Hampshire where we work. Our Portsmouth page covers work nearby (19 miles or so).
All of GU30 and GU31 is within our area for external mastic. Neighbouring places we cover for external mastic include Borden (1 mile west), Milland (1 mile north), Chithurst (1 mile south-east), Rogate (2 miles south-west) and Rake (3 miles north-west). Within a short drive, we also cover Havant (13 miles south-west), Horndean (12 miles south-west), Alton (11 miles north-west), Waterlooville (13 miles south-west), Petersfield (5 miles west) and Purbrook (14 miles south-west).
What’s near Trotton Marsh
The nearest railway station is Liphook station, about 3.7 miles north. Well-known places in the area include Midhurst Museum (4 miles south-east) and Midhurst Community Hospital (3.8 miles south-east). Not far away are Iping and Stedham Commons and Wheeler's Down.
What affects the cost of external mastic
We quote each job individually. This is what makes a difference:
- The number and length of the joints
- Which sealant suits the joint
- Mould in or behind the old joints
- Working hours on commercial sites
Every job is a little different, so we quote each one individually. Size, access and the product the joint needs all play a part, and we’ll explain the quote if you ask.
Helping us quote
To help us quote quickly, let us know:
- What’s wrong with the joints now
- Access, such as stairs, a lift or height
- Roughly how big the job is
- Pictures of the joints, sent by email
For a quote, phone 0345 464 0079 or drop us an email and tell us where the job is and what the problem looks like. You’ll have a clear quote before any work starts.
Questions from Trotton Marsh
Is Trotton Marsh within the area you cover?
Yes, Trotton Marsh is covered. Our work covers London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Liphook station?
Yes, rental work is part of what we do. You can call 0345 464 0079 or drop us an email with the address and a few details, and we’ll give you a fixed price before work begins.
How long should I leave it?
Most sealants are touch-dry well before they’re fully cured. We will tell you how long to leave the joint before we leave.
Will there be a smell?
It depends on the product. Some smell for a while, some hardly at all, and any smell fades as they cure.
Is there a guarantee?
Yes. Every job comes with our one-year guarantee.
Do I need to be at home?
For indoor joints, yes, someone needs to let us in. After that, you can carry on with your day.
Will the new joint stand out?
The sealant colour is picked to suit the wall so the joint blends in. There’s a wide choice of exterior colours.
What is backing rod for?
That is backing rod, a closed-cell foam. It keeps the sealant at the right depth and bonded to the sides only so it can flex with the joint.
Landlords, agents and businesses in Trotton Marsh
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
In hotels, rooms out of use cost money, so the work can be planned room by room around your bookings where we can. Hotel work is part of what we do, alongside homes and businesses.