Hampshire · England
External Mastic in Holybourne
Professional external mastic in and around Holybourne, with old sealant always removed completely.
- Weeds or debris growing in open joints
- Failed sealant between panels on a façade
- Hard, crazed mastic that has stopped moving
Should I try it myself first?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Some jobs are best left to a professional: work at height, external movement joints, fire-rated sealant and large areas need the right product, the right access and the right method.
External mastic in Holybourne, done properly
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 joint does not stand out. If you have plants rooting in failed movement joints and water getting into walls through failed joints, we can put it right, whatever the surface.
External sealant needs dry, clean surfaces, so work around Holybourne is planned for dry weather. Tell us about access to all sides of the building, including outbuildings and garages.
You’re covered for a year from the day we finish. If there’s a problem with it, please phone 0345 464 0079 or drop us an email.
- Place
- Holybourne (GU34)
- Region
- Hampshire
- Cover
- 12 months on all our work
- Quotes
- A clear quote up front
- Phone
- 0345 464 0079
- Last updated
- 26 October 2026
Aftercare tips
Looking after new joints is easy, and it makes a real difference:
- Do not let climbing plants root in the sealant
- Leave the joints unpainted unless we have said otherwise
- Deal with leaking gutters that soak the joints below
- Point out the joints to other trades
Don’t paint over the new sealant unless we have said the product is paintable. Many exterior sealants are not designed to be painted and spoil the finish.
Gaps, plants or missing sealant in a joint are worth getting looked at. Earlier resealing means a smaller job and a better result.
The process
You don’t need to clear the whole room or building before we come, just the space around the work. Everything nearby is protected, and the job takes anything from a few hours to several days, depending on the building for a typical job. Somewhere like Holybourne needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. Everything for the job comes with us, so a second trip is avoided where possible.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- We cut out the failed sealant and rake out any dirt or growth.
- The joint faces are cleaned and primed where the sealant needs it.
- Backing rod goes in next, setting the depth and keeping the sealant off the back of the joint.
- We gun in a flexible exterior sealant in a colour that suits the wall and tool it neatly.
Before we arrive
- Let us know about parking restrictions
- Tell us about any previous sealing or DIY attempts
- Mention any leaks or damp you’ve noticed
Getting a quote
We do not publish a price list. Instead, your job gets its own clear quote. To arrange one, ring 0345 464 0079 or send us an email.
Related advice
Nearby places to Holybourne
More services for Holybourne
How the job changes by surface
Brickwork movement joints
People sometimes point up a brick movement joint by mistake. If that’s happened, we rake it out and reseal it properly where it can be done safely.
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.
Common problems we fix in Holybourne
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 new sealant then lets go long before it should.
Signs it’s time to call us include:
- Water getting into walls through failed joints
- Gaps where render, brick and frames meet
- Joints pointed up with cement by mistake
- Failed sealant between panels on a façade
For an older house near a landmark such as Holy Rood Church, an extension built onto an older house moves differently, and the joint between them takes the strain.
What to look for in a quote
- What the cure time is
- How the joint is cleaned and prepared
- Whether all the old sealant comes out first
- What happens if they find a problem under the old sealant
Quotes for external mastic in Holybourne
There’s no set price list. The quote depends on:
- The product the joint needs
- How easy the joints are to reach
- The number and length of the joints
- How many areas need sealing
What it costs depends on the size of the job, how much old material has to come out and access to the work. We give a clear quote before we start, so you know where you stand.
Asking for a quote
There’s no need for technical detail. Just tell us:
- Photos by email, if that is easy
- If it’s domestic, commercial or a hotel
- Any previous sealing or DIY work
- Roughly how big the job is
To get a quote, phone 0345 464 0079 or send us an email and tell us where the job is and what the problem looks like. We’ll send you a clear quote before any work starts.
Holybourne questions
I let a flat near Alton station. Can you help?
Yes. We work for landlords and agents as well as homeowners, and several properties can go on one quote. You can call 0345 464 0079 or email us with the details for a clear quote.
Do you cover smaller places like Holybourne?
Yes. Holybourne is within the area we cover, which takes in towns, villages and rural addresses. We work across London and the South East. Let us know about access, parking and anything unusual about getting there when you book.
Can you seal over the old sealant?
No. New silicone will not bond to old silicone, and it traps any mould or water underneath. We remove it all first.
What should I tell you?
A short description and the location, plus photos if you have them. If we need more, we will ask.
Do I have to be there?
We need access to the joints, so we’ll agree that with you when we book. Indoors, that usually means someone at home.
Can a movement joint be filled with mortar?
No. Mortar locks the joint solid, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
Which products do you use?
Quality sealants from brands including Arbo and Everbuild, picked for each joint. We will tell you what we are using and why.
Can you seal joints between render and window frames?
Yes. Where different materials meet is one of the most common joints we seal. The sealant is chosen to bond to both sides, primed where needed.
Work for landlords, hotels and businesses
Businesses can book us for washrooms, kitchens, offices and more. On commercial sites, working times can be discussed when we quote.
Landlords and letting agents in Holybourne can book us as well as householders. Sealant work between tenants is a simple way to keep a property in good order.
Walls and rooflines in Holybourne
With historic houses such as Bentworth Hall (about 4.6 miles west) nearby, there’s older building stock in the area around Holybourne as well as newer homes. Where a home is older, older brick and stone need a sealant that suits them, at the right joint depth. Compared with the north and west, the South East gets less rain, yet outdoor joints still have to be sealed dry, so jobs are booked with the weather in mind.
Letting a property close to Alton station? Then failed wall and movement joints let damp in, so they’re worth checking between tenancies. If you look after a building such as Andrews' Endowed Church of England Primary School, larger buildings have long runs of movement joint that eventually need resealing.
Holybourne is about 2 miles north-east of Alton, in Hampshire. Whether you are in the middle of Holybourne or further out, we cover external mastic for every kind of property, from flats and houses to offices and hotels. 683 places in Hampshire are on our list, from the larger towns to small villages. Our Reading page covers work nearby (20 miles or so).
All of GU34 is within our area for external mastic, from the main roads to the quietest streets. If you need external mastic at a property on London Road, Carpenters Close and Inhams Road or anywhere close by, we can help. If you are just outside Holybourne, we cover Neatham (1 mile south-east), Alton (2 miles south-west), Upper Froyle (2 miles north-east), Wyck (2 miles south-east) and East Worldham (2 miles south). We also work in nearby towns such as Basingstoke (10 miles north-west), Farnborough (12 miles north-east), Fleet (9 miles north-east), Aldershot (10 miles north-east), Petersfield (11 miles south) and Yateley (13 miles north).
Landmarks near Holybourne
In Holybourne, that means homes and buildings near White Hart pub, Eggar's School and Treloar School and the streets around them. For rail, the closest station is Alton station, about 1.2 miles south-west of the centre. Other landmarks nearby include Alton Community Hospital (2.4 miles south-west) and Allen Gallery (1.5 miles south-west). For a walk, there’s Holybourne Hill.