Scottish Borders · Scotland
External & façade joints in Preston, Scottish Borders
External mastic in Preston from a team with over 20 years’ experience. 180+ five-star Google reviews and a 4.9 rating.
- Weathered mastic that no longer stretches
- Rigid filler in a joint that should flex
- Rain getting behind render or cladding at a joint
What happens if it’s left?
Mortar or ordinary filler might look like a quick way to close an open joint, but it stops the joint moving. The movement then cracks the brickwork or render nearby. A flexible sealant over backing rod is what the joint needs. Out of town in Scotland, exposed walls take a lot of weather, and damp in stone or harled walls takes a long time to dry once water gets behind a joint.
We do not show prices on the website, because each job is priced on what it involves. For a quick quote, please drop us a line at info@mrmastic.co.uk.
Why us?
- Sanitary silicone with an anti-fungal additive in wet areas
- Fully insured
- Approved under the ARBOMaster scheme
- Rated 4.9 stars on Google
Read how sealant jobs are priced and customer reviews.
External mastic in Preston, 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 line blends in. Typical jobs include rigid filler in a joint that should flex and plants rooting in failed movement joints, on render & cladding joints, brickwork movement joints and concrete & block.
External sealant needs dry surfaces, so outdoor work around Preston is planned around the weather, and longer journeys are planned in advance. Tell us how to reach each wall, gutter and roofline.
We stand behind the work with a one-year guarantee, so you are not left on your own once the job is done.
- Location
- Preston (TD11)
- Region
- Scottish Borders
- Cover
- One year on every job
- Quotes
- Quoted before any work starts
- info@mrmastic.co.uk
- Page updated
- 26 October 2026
Places near Preston
What else we do in Preston
Signs you need external mastic in Preston
UV, rain and frost all age exterior sealant. In time it goes hard, crazes on the surface and stops stretching, so the joint eventually tears or comes away from one side.
Any of these means the joints need attention:
- Sealant pulling away from one side of the joint
- Old sealant gone brittle and cracked
- Plants rooting in failed movement joints
- Damp patches traced to an open external joint
Homes close to Preston Church include some older properties, and older walls, gutters and the joints where extensions meet them need a flexible sealant.
Questions to ask before you book
- Which sealant they’ll use, and why
- How the colour is chosen
- What happens if they find a problem under the old sealant
- What the cure time is
Can I do it myself?
Too much sealant is as bad as too little. A heavy bead looks messy and copes badly with movement, and the joint depth matters as much as the finish.
If you are set on DIY, put the effort into preparation: remove every trace of old sealant, clean and dry the joint, and follow the product’s cure time. If it fails, we can still redo it.
How it works
We keep the work tidy and contained to the area we’re working on. The job usually takes anything from a few hours to several days, depending on the building. Outdoor work around Preston depends on the weather, as sealant needs a dry surface, so an outdoor job can move if the forecast changes. Work indoors is not affected.
- We look at every joint and agree a colour to suit the wall.
- Failed sealant is removed back to clean, sound faces.
- Backing rod goes in so the sealant can stretch between the two faces.
- Primer is applied wherever the sealant needs it.
- We gun in low-modulus sealant and tool it neatly.
How to prepare
- Mention any leaks or damp you’ve noticed
- Move anything stored near the joints
- Mention any tricky access
Ask for a quote
If you are in Preston and need external mastic, send an email to info@mrmastic.co.uk. Tell us what the problem is and where, and we will agree the price before any work begins.
Advice
Walls and rooflines in Preston
Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and failed outside joints work against that. Plenty of Scottish homes have harled walls, and joints where harling meets other materials need a sealant that can grip and flex.
In and around Preston, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
Preston is in the Scottish Borders. Jobs in Preston get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. We cover 89 towns and villages across the Scottish Borders, large and small. Edinburgh is on our list too, about 35 miles from Preston.
All of TD11 is covered for external mastic. We also cover the places around Preston: Duns (2 miles south), Clockmill (3 miles south-west), Gavinton (3 miles south-west), Chirnside (5 miles east) and Grantshouse (5 miles north).
Near you in Preston
Nearby you will also find Knoll Hospital (2.5 miles south) and Cockburn Tower (1.7 miles north-west). Not far away are Duns Castle nature reserve and Duns Law.
Different surfaces, different methods
Concrete and blockwork
Concrete and block walls shrink as they dry and move with temperature. Their movement joints are sealed over backing rod with a flexible sealant.
Render joints
Cracks along render joints let water in behind the coat. A sound joint keeps the render dry behind and helps it last.
Common questions in Preston
Can you do external mastic in Preston?
Yes, Preston is within the area we cover. We work across all of Scotland. Just send an email to info@mrmastic.co.uk with a few details of the job, and we will give you a clear quote.
Is external mastic in Preston guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We’re also fully insured and ARBOMaster approved.
What colours does the sealant come in?
The aim is a neat, even joint in a colour that suits the wall. Colour is agreed with you before we begin from the range available.
Is it messy?
Tidy work is part of the job. Nearby surfaces are protected, and we clear up when we’re done.
Do you work for letting agents?
Yes, regularly. We can quote for several properties at once.
Do you work at height?
It depends on the height and the site. Low-level joints are straightforward; for higher ones, send details and we will confirm the access.
Can new sealant go over the old?
No, and we never do. It can look neat for a few weeks, but the new bead soon lifts. The old sealant has to come out completely.
Do you work for hotels and businesses?
Yes. We have worked for hotels, offices and other businesses and we are fully insured.
Aftercare tips
So the new joints stay in good condition:
- Ask before painting over external sealant
- Make sure movement joints aren’t pointed over
- Fix overflowing gutters above sealed joints
- Wash walls gently around the sealant
Keep pressure washers away from the sealant. High-pressure water can lift the edges and let water in behind.
Once a joint can’t move, the wall finds another way, usually as cracking in the brickwork or render nearby. Catch it early and you reduce the risk.
When it is not the sealant
New sealant cannot fix everything, and we’d rather say so up front. It will not solve:
- Movement that is more than a sealant joint can take
- Rising or penetrating damp from elsewhere in the wall
- Failed render or damaged cladding panels
If in doubt, email us at info@mrmastic.co.uk and we’ll say what we think.
Surfaces we seal
- Concrete & block
- Façade panels
- Brickwork movement joints
- Joints between brick and frames
- Copings & trims
- Render & cladding joints