Construction Mastic in Firth
Mastic packages for new-build and refurbishment projects in Firth and across the Shetland Islands. CHAS accredited and fully insured, with a 12-month guarantee.
- Snag items on joints that need redoing before handover
- Oversized or tapered gaps around new frames
- Existing joints on a refurb that need cutting out and resealing
Construction mastic for Firth sites
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
How we handle construction mastic in Firth
External mastic depends on the weather in a way most internal trades don’t. Cold or damp mornings, frost and condensation on frames can all hold external sealing up, so we plan elevations with the forecast and the programme in mind. Internal areas can normally carry on while the outside waits. We work on cladding and panel joints, internal decorators’ caulk and window and door perimeters, and the usual reasons a site gets in touch are bath and shower joints scraped during the final clean and missed perimeter joints on a new elevation. For commercial sealant work in Firth, you deal with one contact from quote to sign-off, whether it’s one building or several.
For a site around Firth, we plan the mastic in as few trips as the programme allows. Send drawings, photographs and the programme so everything needed arrives on the first day.
Our 12-month guarantee is about workmanship, not wear and tear. Sealant wears with time, and movement, weather, cleaning and use decide how fast, so we spell out the cover before we begin.
- Location
- Firth (ZE2)
- Region
- Shetland Islands
- Guarantee
- 12 months on our workmanship
- Quote
- Quoted before any work starts
- Telephone
- 01277 525 020
- Last updated
- 3 November 2026
On site: what to expect
Working in a building that stays open takes some planning. We sign and contain the area we are in, keep walkways clear and work section by section so the rest of the building stays in use. Jobs near Firth are often grouped with others in the same area. Tell us how flexible your dates are.
- First we take quantities off the drawings and read through the specification.
- You receive a fixed quote listing scope, products and phasing.
- Any site paperwork you need (RAMS, insurance certificate, CSCS details) is confirmed with the quote.
- Work follows the programme, area by area, as rooms and elevations become ready.
- Every joint is prepared, set to depth and sealed with the specified product.
- Before handover, snags are dealt with and the package is signed off under our 12-month guarantee.
What we need from you
- Tell us which areas need to stay in use
- Point out parking and an unloading spot
- Tell staff and tenants when we will be in
Get a fixed quote
If there’s a specification, drawings or a tender package, send it with your enquiry, and we will price against exactly what is specified. Smaller jobs need nothing more than photographs and a few notes.
Related advice
When to call us in Firth
Dust is the enemy of adhesion on a construction site. Plaster dust, release agents, protective film residue and damp all stop sealant bonding.
Any of the following is a good reason to get the joints checked over:
- Frame gaps too wide for sealant alone
- External joints sealed in damp or cold conditions that are now failing
- Caulk cracking where joints are moving more than expected
- Missed perimeter joints on a new elevation
Sites around Firth get mastic sealed to the drawings and the programme, nothing improvised.
Comparing quotes
- Are they CHAS accredited or on Constructionline?
- What level of public liability insurance do they hold?
- How long is the guarantee, and what does it include?
- Whether primer will be used where the manufacturer specifies it
Why it’s worth doing now in Firth
It helps to bring the mastic subcontractor in before the package is urgent. We can check joint widths, flag frames with gaps that won’t seal and confirm products against the specification, which avoids last-minute problems. Called in at the end, the same issues surface during handover. In Scotland, wind-driven rain finds a failed joint quickly, and for a smaller place like Firth, a repair visit takes planning, so it’s better to act early.
A quote for mastic packages depends on quantities, condition and access. Call for a quote.
Why choose Mastic Doctor in Firth
- CHAS accredited contractor
- Fixed quotes based on photographs, drawings or a visit
- Work to your specification and the manufacturer’s guidance
- Old sealant cut out, never sealed over
Take a look at what affects the cost or our accreditations.
What sealant work can’t fix
A proper diagnosis includes knowing what sealant can’t do. We’ll tell you if the real problem is any of the following:
- Deciding which fire-stopping product a penetration needs
- Glazing units that are cracked or misted
- Joint design decisions that belong to the architect or engineer
Not sure which it is? You can call 01277 525 020 or email drawings and photos and we’ll tell you honestly before you book.
Surfaces we seal
- Sanitary and kitchen joints
- Brick and block movement joints
- Floor and skirting junctions
- Window and door perimeters
- Cladding and panel joints
- Internal decorators’ caulk
Looking after the joints
Your facilities or cleaning team can help the joints last. Pass these on to them:
- Keep scrapers and abrasive pads off new beads
- Note which sealant went where at handover
- Share drawings and the specification as soon as possible
- Allow flexibility for external sealing in damp or cold weather
The package carries our 12-month guarantee for workmanship. The guarantee covers how we sealed, not later damage by other trades which is why protection after sealing matters.
In wet areas, a weak sanitary joint shows up quickly once the building is occupied. Leaks behind showers and basins damage finishes and floors, and the repair falls into the defects period. Getting the product and preparation right first time avoids that.
What else we do in Firth
Construction mastic in Firth: the local picture
Firth sits close to the coast, within about 2 miles. Schemes this close to the sea see their facade joints tested by wind and rain from the day they’re sealed, and the sealant, primer and backing need choosing with that in mind. Island jobs, Firth among them, are planned around the ferry and the forecast. With drawings and the programme in hand, the whole mastic package comes with us.
Around Firth, as anywhere, a facade joint depends on its sizing, backing rod and preparation.
Firth is in the Shetland Islands. If you’re looking for construction mastic in Firth, we can help, as we do across the Shetland Islands. Firth is one of 63 places in the Shetland Islands on our list for mastic packages.
We cover the ZE2 postcode districts. If your site is on Midlea, Leaside and Sandside or close by, we can quote for mastic packages. Close to Firth, our area also takes in Mossbank (1 mile north-east), Scatsta (4 miles west), Vidlin (6 miles south), Sullom (6 miles west) and Burravoe (6 miles north-east). Where a site is remote or on an island, travel and materials need planning ahead.
Around Firth
The countryside around Firth includes Loch of Bordigarth.
Questions we’re asked in Firth
Will you travel to Firth on the island?
Yes, Firth is within the area we cover. Our area covers all of Scotland, cities, towns and islands alike. Ferry times and the weather set the plan, so we ask for photos and a full list first.
Can being near the sea in Firth affect the sealant we need?
It can. Driven rain and salt are tougher on outside sealant than sheltered inland conditions. Product choice and preparation matter more, and sea-facing elevations are worth inspecting more often.
Is any job too small?
Single areas, one-off repairs and whole buildings are all quoted the same way: details, then a fixed price, then sealing, then a 12-month guarantee.
Do you need to see the site first?
It depends on the job. Straightforward work can often be priced from photographs and measurements, and bigger or more complex jobs usually get a visit.
How do you deal with asbestos in old sealant?
Managing asbestos is the dutyholder’s responsibility, so we will ask for the register before work on an older building. Work pauses if suspect material is found, until it has been tested.
Can the building stay open while you work?
In the majority of cases, yes. We phase the work so most of the building stays in use.
What hours do you work?
Mention the site’s hours and access windows in your enquiry, and we will plan around them. Our office runs Monday to Friday, 8am until 5pm.
Building owners, agents and FMs in Firth
We work for building owners and managing agents on everything from one building to a spread of sites around Firth. One quote can cover more than one site, so there’s one set of paperwork to deal with.
Main contractors use us as their sealant subcontractor on new-build and refurbishment projects. Programme, specification and site rules come first.