Dundee · Scotland
External & façade joints in Longforgan, Dundee
External mastic for Longforgan and the surrounding area: the right sealant, proper preparation and a neat finish. Ask us for a quick quote.
- Failed sealant between panels on a façade
- Rigid filler in a joint that should flex
- Joints with sealant missing in places
About our external mastic in Longforgan
Getting the depth right is half the job. Closed-cell backing rod sets the depth and stops the sealant sticking to the back, leaving it bonded to two faces so it can move with the wall. We work on copings & trims, render & cladding joints and concrete & block, and the jobs we see most are damp patches traced to an open external joint and panel joints letting water in.
Older stone buildings need a sealant that suits the stone, not an acetoxy product that can mark or attack it. On newer homes, the movement joints and roofline trims are what need watching.
We guarantee the work for a year. If there’s a problem with our work within the year, let us know and we will sort it.
- Location
- Longforgan (DD2)
- Wider area
- Dundee
- Cover
- One year on every job
- Quotes
- A clear quote up front
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
How the job changes by surface
Cladding and façade panels
Panels heat up and cool down quickly, so the joint sealant has to cope with frequent movement. The sealant is chosen with that in mind.
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.
When to call us in Longforgan
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.
The problems people normally mention when they call are:
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
- Cracked joints where brick meets render or frames
- Joints where the bead has come unstuck
In the older streets around Longforgan Parish Church, the joints between older walls, newer extensions and the roofline need a sealant that can move.
Before you book anyone
- Which colour the sealant will be
- What the quote includes, VAT included or not
- Whether they seal over old material or remove it
- How the joint is cleaned and prepared
For landlords and businesses
Water getting past a failed joint can damage the building, which matters even more when someone else lives there. Keeping joints in good order is simple maintenance that we can handle for you.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Towns and villages near Longforgan
What else we do in Longforgan
Keeping the joints in good condition
Good habits help new joints last longer. A few tips:
- Walk round the building once a year and look at the joints
- Never let anyone fill a movement joint with mortar
- Fix overflowing gutters above sealed joints
- Show decorators and builders where the movement joints are
Only paint over the joint if we have confirmed the sealant can take paint. Many exterior sealants aren’t designed to be painted and spoil the finish.
Leaks behind façade panels and render often go unseen. By the time there’s a damp patch, the damage can be well established.
What we do, step by step
There isn’t much for you to do on the day. Show us the job and we’ll take it from there. The work itself takes anything from a few hours to several days, depending on the building from start to finish. For a place like Longforgan, longer drives are planned in advance. Mention tracks, gates, ferries or anything else about the route.
- We start by checking each joint, agreeing the ones to redo and how we will reach them.
- Old sealant and any debris are cut and raked out.
- The joint faces are cleaned and primed where the sealant needs it.
- We push in closed-cell backing rod so the sealant is the right depth and bonds to the sides only.
- The new sealant, chosen to suit the brick or render, is applied and tooled to a neat finish.
Getting ready for the visit
- Try not to wet indoor joints just before the visit
- On commercial sites, let us know about site rules
- Tell us about access, such as stairs, a lift or high-level joints
Get a quote
For external mastic in Longforgan, 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.
Read more
When something else is needed
We won’t take on work that won’t last, so these are the limits:
- Damp that is not coming from the joint
- Render that is blown, hollow or coming away
- Movement that is more than a sealant joint can take
Not sure which it is? You can send an email to info@mrmastic.co.uk and we’ll tell you honestly.
What we seal
- Façade panels
- Copings & trims
- Brickwork movement joints
- Concrete & block
- Joints between brick and frames
- Render & cladding joints
Quotes for external mastic in Longforgan
You’ll get a clear quote before any work starts. It takes into account:
- The old material and how stubborn it is
- When we can work, for business premises
- Whether the work is at height
- Whether there’s mould to deal with
A few things move the cost up or down: how much old sealant there is and how stubborn it is, whether mould needs treating, and whether the work is at height. Your quote takes all of that into account.
What to tell us for a quote
Photos by email are helpful but not essential. Try to tell us:
- Any previous sealing or DIY work
- The type of property
- Where the job is, and your postcode
- Roughly how big the job is
For a quote, send an email to info@mrmastic.co.uk with the location and a short description of the problem. We will give you a clear quote before any work starts.
Longforgan buildings and the weather
Longforgan is close to the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. Both are hard on movement joints and outside wall joints, which can dry out and crack sooner where a building faces the weather. Private landlords in Scotland must meet the Repairing Standard, which includes keeping a home wind and watertight, and sound outside sealant is part of that.
For landlords with property near Invergowrie station, failed wall and movement joints let damp in, so they’re worth checking between tenancies.
Longforgan is about 6 miles west of Dundee, in Dundee. Jobs in Longforgan get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. 50 places in Dundee are on our list, large and small. Our Dundee page covers work nearby, about 6 miles away.
We cover every part of DD2 for external mastic and the streets around it. That includes homes and businesses on Main Street, Dorward Place and Paterson Place. Neighbouring places we cover for external mastic include Inchture (2 miles south-west), Kingoodie (2 miles east), Invergowrie (2 miles north-east), Fowlis (2 miles north) and Liff (2 miles north-east). Larger places within reach include Dundee (6 miles east), Broughty Ferry (10 miles east), Stobswell (6 miles east), Monifieth (11 miles east), Blackness (5 miles east) and Barnhill (10 miles east).
Near you in Longforgan
Longforgan’s nearest station is Invergowrie station, about 2.5 miles east. Other landmarks nearby include Royal Dundee Liff Hospital (2.7 miles north-east) and Castle Huntly (0.7 miles south-west). Green spaces nearby include Rossie Lake and Balgay Hill.
Longforgan questions
I let a flat near Invergowrie station. Can you help?
Yes. We work for landlords and letting agents as well as homeowners. You can send an email to info@mrmastic.co.uk with the details for a clear quote.
Does the coastal weather in Longforgan affect outside sealant?
Coastal homes put outside sealant through more weather than inland ones, so preparation and the right sealant matter all the more. Walls facing the sea are usually the first to need attention.
What do you need from me for a quote?
Just the basics: where it is, what you’ve noticed and how we reach it. Then drop us a line at info@mrmastic.co.uk.
Is the work guaranteed?
Yes. Every job comes with a 12-month guarantee.
Do you cover Longforgan?
Yes. We are based in Crawley and work across South East England, London and Scotland.
Can new sealant go over the old?
No. We remove every bit of old sealant first, so the new joint bonds to clean surfaces.
What do you put in the joint?
Each joint gets the product that suits it. Movement, water and weather all affect the choice.
Is it OK to fill a movement joint with cement?
No, not where the gap is a movement joint. Filling it with mortar defeats its purpose. We’ll reseal it with a flexible sealant.