Glasgow · Scotland
Mount Florida External Mastic
Problem with your movement joints in Mount Florida? We remove the old material, prepare the joints and seal them properly, with a one-year guarantee.
- Joints where the bead has come unstuck
- Damp patches traced to an open external joint
- Old sealant gone brittle and cracked
Honest limits
To be straight with you, there are a few things sealant will not fix:
- Render that is blown, hollow or coming away
- Movement that is more than a sealant joint can take
- Cracking across the wall rather than at a joint
If in doubt, send an email to info@mrmastic.co.uk and we will say what we think before you book.
Surfaces we seal
- Concrete & block
- Render & cladding joints
- Joints between brick and frames
- Brickwork movement joints
- Façade panels
- Copings & trims
How we handle external mastic in Mount Florida
External mastic is a job where short cuts show quickly. New sealant over old, joints packed with mortar and beads with no backing rarely last long. We strip the joint back and start again. We are often asked to deal with plants rooting in failed movement joints and water getting into walls through failed joints, on concrete & block, render & cladding joints and copings & trims.
On a four-storey tenement, gutter joints are a long way from the street, so a leaking joint can run down the stone for months before anyone notices. For a building in Mount Florida, access is planned first, and shared parts may need the other owners to agree.
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.
- Location
- Mount Florida (G44, G42, G43)
- Wider area
- Glasgow
- Cover
- 12 months on all our work
- Quote
- A clear price before we start
- info@mrmastic.co.uk
- Last updated
- 26 October 2026
Do you need external mastic in Mount Florida?
Weeds, moss and debris in a joint are a sign the sealant has gone. Roots and dirt hold water against the wall and make things worse.
People normally contact us after spotting one of these:
- Rain getting behind render or cladding at a joint
- Sealant that has lost its bond to the brick or render
- Brick movement joints where the sealant has split
- Cracked joints where brick meets render or frames
If you let a flat or house near Mount Florida station, split movement joints are easy to miss on a rental until damp shows inside.
Before booking anyone
- Who does the work, and how experienced they are
- Is the old sealant removed completely?
- How the surfaces are prepared before sealing
- Which sealant they’ll use, and why
How the visit works
Once we’re on site, we compare the joints with what we discussed. If anything is different, we explain it before carrying on. After that, the work takes anything from a few hours to several days, depending on the building. Inside a flat in Mount Florida, the job is planned with you; outside, shared parts may need the factor or other owners involved. It helps to know which it is when you get in touch.
- 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.
- Backing rod sized to the joint goes in to set the depth.
- We apply the sealant, tool it and check the whole run.
Preparing for the visit
- Tell us about any water getting in
- On commercial sites, let us know about site rules
- Keep pets and children clear of the area while we work
Get a quote
Every job is quoted individually, so start by telling us what you need. Just email us at info@mrmastic.co.uk with the details.
Read more
Why act early in Mount Florida
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. For landlords in Mount Florida, damp and leaks can be a Repairing Standard issue, so it’s worth fixing failed sealant before a tenant reports it.
Leaving a failed joint generally makes the job bigger, not smaller, because water and mould keep working on it. If you are unsure, email us at info@mrmastic.co.uk and we’ll give you an honest view and a quote.
What you get with us
- Quality sealants from Arbo and Everbuild
- Anti-fungal silicone where joints get wet
- Any old sealant cut out fully, not covered over
- We’re fully insured
Read what affects the cost and customer reviews.
Other services in Mount Florida
Common questions in Mount Florida
Is Mount Florida in your area for external mastic?
Yes, Mount Florida is within the area we cover. We work across all of Scotland. Just drop us a line at info@mrmastic.co.uk with a few details of the job.
Who arranges sealant work on the shared parts of a tenement in Mount Florida?
The owners of the flats normally agree repairs to shared parts like the roof and outside walls, and many buildings have a factor to arrange it. Where the title deeds are silent, the Tenements (Scotland) Act 2004 fills the gaps. Windows often belong to the individual flat, but it’s worth checking your deeds.
Can you work on commercial sites?
Yes. Commercial and hotel work is a large part of what we do. Working times can be discussed when we quote.
Do the sealants smell?
Some sealants have a smell while they cure, but it fades. Ventilation helps.
Do you hold any approvals?
Yes. We hold ARBOMaster approved applicator status and we’re fully insured too.
Do you take out the old sealant first?
Yes, always, and completely. New sealant will not bond properly to old, so the joint is cleaned back first.
Where are you based?
Mr Mastic is based in Crawley. Our applicators cover Mount Florida.
Do you use backing rod?
Closed-cell backing rod sets the depth of the sealant and stops it sticking to the back of the joint. Then the sealant bonds to two faces and can move.
What the job involves on each surface
Joints between dissimilar materials
Each side of the joint may need its own preparation. We prepare both faces so the sealant bonds properly.
Render joints
Cracks along render joints let water in behind the coat. Resealing the joints early keeps water out and helps it last.
DIY sealant or a professional job?
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.
Too much sealant is as bad as too little. A thick, smeared bead looks untidy and does not move well, and the joint depth matters as much as the finish.
Outside joints around Mount Florida
Much of Glasgow is built from red and blond sandstone, and porous sandstone needs a sealant that will not mark it. Under the Repairing Standard, private landlords in Scotland have to keep homes wind and watertight, and failed outside joints work against that.
Historic houses such as Pollok House, about 2.4 miles west, show how far back building around Mount Florida goes. Managing a site like Holyrood Secondary School? Then its movement joints, gutters and trims need looking after like any other building’s.
Mount Florida is about 2 miles south of Glasgow, in Glasgow. Our applicators cover external mastic for homes and businesses in Mount Florida. Mount Florida is one of 183 places in Glasgow where we work.
Our applicators cover all of the G44, G42 and G43 postcode area for external mastic. Whether your property is on Ledard Road, Delvin Road and Elmore Lane or a nearby road, our applicators can take on the job. We also cover Cathcart (1 mile south-west), King's Park (1 mile east), Crosshill (1 mile north), Toryglen (1 mile north-east) and Simshill (1 mile south). We also work in nearby towns such as Hillhead (4 miles north), Dowanhill (4 miles north-west), Woodlands (3 miles north), Woodside (4 miles north), North Kelvinside (4 miles north) and Partickhill (4 miles north-west).
Local landmarks in Mount Florida
Around Mount Florida, our work takes us to homes and buildings near Cathkin Park, The Albert Public House and Couper Institute and Library. There’s a railway station in Mount Florida itself: Mount Florida station. Other landmarks nearby include Scottish Football Museum (within half a mile north-east) and New Victoria Hospital (0.5 miles north-west). For a walk, there’s Cathkin Braes.
How to look after the new joints
A little care helps the new joints last. Our advice:
- Look over the joints every year, ideally after winter
- Ask before painting over external sealant
- Keep high-pressure jets off the joints
- Keep water from gutters off the wall
If you have more work done on the wall, such as new render, cladding or an opening, show the contractor the movement joints. They should be kept open and resealed, not filled.
An open movement joint lets rain into the wall every time it pours. Over time it can mean damp inside, stained render or frost-damaged brick which cost more to put right than the joint.