Shetland Islands · Scotland
Hamister External Mastic
External mastic across Hamister and nearby, with every bit of old sealant taken out first.
- Panel joints letting water in
- Hard, crazed mastic that has stopped moving
- Brick movement joints where the sealant has split
External mastic for homes and businesses in Hamister
Failed sealant is cut out, the depth set with closed-cell backing rod, and the joint resealed with a low-modulus sealant made for outside. We pick a colour that sits well with the wall so the line blends in. We work on concrete & block, copings & trims and façade panels, and common reasons people get in touch are panel joints letting water in and movement joints filled with mortar instead of sealant.
Outside joints can only be sealed when they’re dry, so work in Hamister depends on the weather, and longer journeys are planned in advance. Let us know about access to every wall and roofline.
Every job comes with our one-year guarantee.
- Location
- Hamister (ZE2)
- Wider area
- Shetland Islands
- Guarantee
- 12 months on all our work
- Price
- A clear quote up front
- info@mrmastic.co.uk
- Updated
- 26 October 2026
What happens if it’s left?
An open joint keeps letting water into the wall with every downpour. In cold weather, frost can damage wet brick and render around the joint, so the damage spreads beyond the joint. In an older home around Hamister, damp from a failed joint can get into timber and plaster.
A failed joint rarely gets cheaper to fix by waiting, because water and mould keep working on it. If you’re not sure whether it needs doing, send an email to info@mrmastic.co.uk for an honest opinion and a quote.
Why us?
- Neat joints and a tidy finish
- ARBOMaster approved applicator
- Full insurance on every job
- Sealant colour chosen to suit
Read what affects the cost or what customers say.
Do you need external mastic in Hamister?
The wrong product in a moving joint is a classic cause. A stiff, general-purpose sealant can’t cope with a joint that moves a lot, so it pulls away from the edges.
The most common problems we see are:
- Brick movement joints where the sealant has split
- Old sealant gone brittle and cracked
- Gaps where render, brick and frames meet
- Moss and dirt in joints with no sealant left
In and around Hamister, as anywhere, good external mastic starts with a clean, dry, properly prepared joint.
What to look for in a quote
- Which sealant they’ll use, and why
- Whether they’re fully insured
- Who does the work, and how experienced they are
- Whether all the old sealant comes out first
What else we do in Hamister
Quotes for external mastic in Hamister
Jobs vary more than people expect. The main factors:
- Working hours on commercial sites
- Mould in or behind the old joints
- The size of the job
- Access and height
Rather than a set price list, we price the job in front of us: the amount of work, the old material and the access. You will know the price before we begin.
Asking for a quote
When you call or email, these details help:
- Pictures of the joints, sent by email
- How many joints, rooms or windows are involved
- How we’d reach the joints
- Any previous sealing or DIY work
Every job is quoted individually, so the first step is telling us about yours. Simply drop us a line at info@mrmastic.co.uk and describe the job.
What sealant work cannot fix
Before you book, it’s worth knowing the limits too:
- Cracks in the bricks or render themselves, away from the joints
- Subsidence or other structural problems
- Walls that need new movement joints cut into them
Not sure which it is? You can drop us a line at info@mrmastic.co.uk and we will tell you honestly.
Where we work in Hamister
- Joints between brick and frames
- Brickwork movement joints
- Render & cladding joints
- Copings & trims
- Façade panels
- Concrete & block
The process
There isn’t much for you to do on the day. Show us the job and we will take it from there. The job generally takes a few hours for a handful of joints, longer for a whole elevation, including the tidy-up. In smaller Scottish places, parking is usually less of an issue than access and distance. Let us know how to find you and how to reach the joints.
- 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.
How to prepare
- Tell us about access, such as stairs, a lift or high-level joints
- Try not to wet indoor joints just before the visit
- Let us know if you’ve seen damp or leaks
How to get a quote
The more we know about the job, the more useful the quote. Let us know the location, the problem and roughly how many joints, and add pictures by email if you can.
Read more
Your questions about external mastic in Hamister
Is external mastic in a coastal place like Hamister any different?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. The right product, a clean joint and the right depth all help it cope.
Is Hamister within the area you cover?
Yes, we do. Our work covers the whole of Scotland, islands included, and smaller places are part of that. The journey is planned ahead, so it helps to know about access.
Is it OK to fill a movement joint with cement?
No. A mortar-filled joint can’t move, so the movement cracks the wall elsewhere. It needs a flexible sealant over backing rod.
How long will you be here?
As a guide, most jobs take a few hours for a handful of joints, longer for a whole elevation. Bigger jobs take longer, and we will say how long yours will take.
When will the joints need doing again?
It varies from wall to wall: joints on exposed walls or with a lot of movement age sooner. A yearly look will tell you when they need doing. Our work comes with a 12-month guarantee.
What sealant do you use?
We choose the sealant for the joint, not the other way round. Movement, water and weather all affect the choice.
Is the work guaranteed?
Yes: twelve months. If anything isn’t right with the work within the year, let us know and we’ll sort it.
What is backing rod for?
That is backing rod, a closed-cell foam. It stops the sealant going in too deep and bonding to three sides so it can flex with the joint.
Surface by surface
Joints between dissimilar materials
Where a frame or panel meets masonry, water often finds a way in. The old joint is removed and a sealant that bonds to both sides goes in.
Brickwork movement joints
Brick moves with heat and moisture, and grows a little over time. That movement goes into the joint, so its sealant has to stay flexible.
For landlords and businesses
Whether it’s one flat or a portfolio, the work is the same standard: old sealant fully removed, joints prepared properly and a one-year guarantee.
Water getting past a failed joint can damage the building, which is a bigger problem in a rented property. Resealing at the right time is simple maintenance that we can handle for you.
Walls and rooflines in Hamister
Hamister is within about 1 mile of 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. Harled (roughcast) walls are common in Scotland, and joints where harling meets other materials need a sealant that can grip and flex.
Whether the job is in Hamister itself or nearby, the right material for each joint matters as much as a neat finish.
Hamister is in the Shetland Islands. Jobs in Hamister get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Hamister is one of 63 towns and villages in the Shetland Islands where we work.
Our applicators cover all of the ZE2 postcode area for external mastic. Streets in the area include Norrendal and North Park, all of which we cover. Other places close to Hamister include Symbister (1 mile south), Tripwell (1 mile north-east), Sandwick (1 mile south), Clate (1 mile south) and Brough (1 mile north-east). Within a short drive, we also cover Lerwick (15 miles south), Sound (15 miles south) and Brae (12 miles west). Remote and island addresses need a little more planning, so tell us where you are when you ask for a quote.
Near you in Hamister
Not far away are Setter Hill and Little Water.