Hertfordshire · England
External Mastic in Tring
Sealing brickwork movement joints, render, cladding and façade joints for homes and businesses in Tring and across Hertfordshire. Fully insured, ARBOMaster approved and guaranteed for a year.
- Joints with sealant missing in places
- Rigid filler in a joint that should flex
- Hard, crazed mastic that has stopped moving
Leave it or put it right?
A low-modulus sealant is chosen because it moves without pulling hard at the edges. That matters on brick, render and concrete, which can be weaker at the face. Too stiff a sealant can pull at the edges and break them. In an older home around Tring, damp from a failed joint can get into timber and plaster, which is far harder to put right than the sealant itself.
Some things make a job bigger or smaller: the old material and how easily it comes out, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
Why us?
- 20+ years of sealant experience
- Every job guaranteed for a year
- Approved under the ARBOMaster scheme
- Tidy, careful work
Take a look at how sealant jobs are priced and what customers say.
How we handle external mastic in Tring
As ARBOMaster approved applicators, we choose exterior sealants to suit the joint and the surfaces. Porous or awkward surfaces are primed where the sealant needs it. We work on concrete & block, joints between brick and frames and façade panels, and common reasons people get in touch are plants rooting in failed movement joints and panel joints letting water in.
Around Tring, garages, outbuildings and extensions all add to the joints on the outside of a home. Gutter ends, garage door frames and the joints where an extension meets the house are typical spots for leaks.
Whatever the size of the job, it’s backed by our 12-month guarantee in Tring and across Hertfordshire.
- Place
- Tring (HP23)
- Wider area
- Hertfordshire
- Guarantee
- One year on every job
- Price
- Quoted before any work starts
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
What affects the cost of external mastic
We quote each job individually. These are the things that affect it:
- Whether old sealant or filler has to be cut out
- The size of the job
- Whether there’s mould to deal with
- Which sealant suits the joint
Commercial jobs are quoted on the same basis as homes: the amount of work, how we reach it and what it needs. Ask us for a quote and we’ll go through it with you.
What to tell us for a quote
Before you ask for a quote, have a think about:
- Where the property is
- If someone has resealed it before
- How we’d reach the joints
- Pictures of the joints, sent by email
Every job is quoted individually, so the first step is telling us about yours. Simply ring 0345 464 0079 or drop us an email and describe the job.
Work for landlords, hotels and businesses
Hotels need rooms back in use, so we plan the work room by room around your bookings where we can. We’ve worked in hotels as well as homes and businesses.
We work for landlords and letting agents as well as householders. Sealant work between tenants keeps a property looking cared for.
The process
The work is kept neat and contained to the joints we’re treating, so you can get on with your day. Expect the work to take anything from a few hours to several days, depending on the building, and we explain the cure time before we leave. For a job in Tring, we agree the time, the access and parking before the day. Outdoor jobs depend on a dry day, since sealant needs a dry surface.
- 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.
- We apply the sealant, tool it and check the whole run.
Before we arrive
- Mention any tricky access
- For business premises, tell us about site rules or sign-in
- For indoor joints, keep the area dry beforehand if you can
Get a quote
Want a quote for external mastic? Please call 0345 464 0079 or email us with a few details. We’ll explain what we’d do and give you a clear quote before any work starts.
Read more
How the job changes by surface
Copings and trims
Coping joints that leak let water straight down into the wall. Resealing them is a small job that protects a lot.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
What a professional job adds is preparation and the right product. We take joints back to clean, dry surfaces, and the sealant is chosen for how the joint moves and where it is.
Your questions about external mastic in Tring
I let a flat near Tring station. Can you help?
Yes. We work for letting agents and landlords as well as homeowners. You can call 0345 464 0079 or drop us an email with the details for a clear quote.
Can you do external mastic in Tring?
Yes, Tring is within the area we cover. Our work covers London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we’ll give you a clear price.
Can a movement joint be filled with mortar?
No. Rigid materials cannot 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.
When is the sealant fully cured?
Cure times vary by product. Before we leave, we will tell you the cure time.
Are you an approved applicator?
Yes. We are ARBOMaster approved, the scheme for applicators of Arbo sealants.
When will the joints need doing again?
It depends on the exposure, the movement and the product. Treat it as a maintenance item and look at it yearly and renew it when it starts to fail.
Can I do it myself?
For a simple, easy-to-reach joint, a careful DIYer can do a reasonable job. The usual mistakes are sealing over old sealant, sealing a damp joint and using too much.
Do you work for hotels and businesses?
Yes, regularly. Larger jobs can be planned room by room or area by area.
What external mastic looks like in Tring
Rainfall in the South East is lower than in much of the UK, though outdoor sealant still has to go onto a dry joint, so the forecast decides the day. With historic houses such as Cholesbury Manor House (about 2.9 miles south) nearby, there’s older building stock in the area around Tring 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.
In the older streets around Church of St Peter St Paul (church of England), old and new materials meet at the roofline and walls, which is where sealant earns its keep. Schools such as Bishop Wood Church of England Junior School are buildings too, and larger buildings have long runs of movement joint that eventually need resealing.
Tring is about 7 miles east of Aylesbury, in Hertfordshire. Homes, rented property, offices and hotels in Tring is covered for external mastic. The work is guaranteed for a year. Tring is one of 381 towns and villages in Hertfordshire where we work. Oxford is on our list too, about 25 miles from Tring.
Every address in HP23 is covered for external mastic. You will find streets such as Dolphin Square, High Street and London Road, and we cover them all. You’ll find Tring on the B486 and B488, so it’s easy for us to get to. Other places close to Tring include West Leith (1 mile south-west), Wigginton (1 mile south-east), Hastoe (2 miles south), Cow Roast (2 miles south-east) and Buckland Common (3 miles south). Further out, we also cover Watford (15 miles south-east), Hemel Hempstead (9 miles east), St Albans (15 miles east), Harpenden (13 miles east), Berkhamsted (5 miles south-east) and Rickmansworth (14 miles south-east).
Around Tring
We work in homes and buildings around Tring Park, Tring School and The Black Horse pub, among other places. The closest station to Tring is Tring station, roughly 1.8 miles east. Other landmarks nearby include Pitstone Green Museum (2.6 miles north) and Stoke Mandeville Hospital (5.9 miles west). The countryside around Tring includes Pavis Wood and College Lake nature reserve.
Signs you need external mastic in Tring
Sometimes a movement joint was filled with mortar or a rigid filler, often by someone who didn’t know what it was for. The joint cannot move, so the wall cracks somewhere else instead.
Signs it’s time to call us include:
- Gaps where render, brick and frames meet
- Brick movement joints where the sealant has split
- Damp patches traced to an open external joint
- Weathered mastic that no longer stretches
Rented homes near Tring station change hands often, and outside joints that have cracked can let damp into a rental, so check them between lets.
Questions to ask before you book
- Whether VAT is included
- Which colour the sealant will be
- The length of the guarantee
- How the surfaces are prepared before sealing