The Mastic Doctor team standing beside their branded vans outside an office building
Na h-Eileanan Siar · Scotland

Bac expansion joint sealing

Commercial sealant work in Bac for contractors, FMs and building owners: expansion and movement joint sealing in walls, decks and floors, with a fixed quote first.

  • New sealant over old, now failing
  • Brittle, chalky sealant on external joints
  • Expansion joints filled with dirt and stones
1
Send details
Tell us about the site, with photos if you have them.
2
Get a quote
A fixed price, with what’s included set out clearly.
3
We seal
The right sealant, to the right depth, neatly finished.
4
Guaranteed
Our workmanship is guaranteed for 12 months.
London, the South East & Scotland
CHAS & Constructionline
£5m public liability

Expansion joint sealing for Bac sites

Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.

Expansion joint sealing for commercial buildings in Bac

Floor movement joints in warehouses, retail and public buildings carry wheeled traffic. Without a sound filler, joint edges chip and spall under load, so the right filler or sealant for the traffic and movement matters. We will tell you if the edges need repairing before sealing. If you’re dealing with expansion joints filled with dirt and stones and torn sealant in brick or block movement joints, we can help, on car park decks and ramps, podiums and floor movement joints and blockwork control joints alike. Whoever orders the work in Bac, the brief is usually the same: a fixed quote, no surprises on site and a 12-month guarantee behind the result.

In smaller places such as Bac, the joints we are asked about sit in workshops, farm sheds, schools and halls. Concrete slabs and yards there take vehicles and weather.

Every job is signed off with a 12-month guarantee. The promise is simple: if our work fails within that year, we put it right.

Mastic Doctor team members lined up next to their branded vans outside an office building
Where
Bac (HS2)
Region
Na h-Eileanan Siar
Cover
12 months on every job
Price
Fixed quote, scope in writing
Call
01277 525 020
Page updated
3 November 2026

Surface by surface

Car park decks and ramps

Car park joints are some of the hardest-working joints in any building. A trafficable sealant suited to the movement goes in with bays done in phases so the car park keeps running.

Brickwork and blockwork joints

Brick and block edges need careful preparation. Faces are prepared and primed wherever the sealant maker calls for it, then seal and tool the joint.

Our process

Inspect, seal, sign off: that’s the shape of every visit. We inspect the joints and confirm what’s in scope, then we prepare and seal each joint with the specified product, and the job ends with a walk round and sign-off. Tell us who will meet us and how to get in at your building near Bac. That goes into the plan alongside the quote.

  1. We start with photographs, approximate lengths and any drawings, visiting where needed.
  2. We compare each joint’s width with the movement and the sealant’s capability.
  3. Every joint is cleared of the failed seal and any grit packed into it.
  4. Any broken arrises or friable edges are flagged before work goes further.
  5. The right sealant goes in at the right depth, bonded to the two sides only.
  6. Areas reopen once cured, and the work carries our 12-month guarantee.

Before we start on site

  • Share your working hours and any access restrictions
  • Make sure the joints can be reached
  • Point out parking and an unloading spot

Ask for a quote

The quickest route to a quote is a few photos and the site postcode. Send them through the quote form, or call 01277 525 020 or email a schedule or drawings to discuss it first.

Get a quick quote

Related advice

Doing it in-house

There’s also the paperwork. Main contractors and clients often ask for CSCS cards, RAMS and insurance details, and we will confirm the paperwork you need with the quote.

For most general trades, sealant is a sideline. A specialist brings correct preparation, depth control with backing rod and a product suited to that particular joint.

Owners, agents and contractors

Building owners and managing agents use us on sealant work across single buildings or whole portfolios. Several sites can go on one quote, so there’s one set of paperwork to deal with.

Hospitality, education, healthcare, office and retail clients come to us directly as well. The work is planned around how the building runs, so the building keeps working while we do.

Floors, slabs and movement joints in Bac

With the shore within about 1 mile, Bac counts as a coastal location. Coastal yards and decks give their joints salt and wet weather to deal with, not just wheels, so a failed joint lets more in and the edges break up sooner. Bac is in the west of Scotland, the wetter side of the country. Open joints in external slabs take a lot of water. We wait for dry, workable days to seal them.

Around Bac, each joint gets a filler or sealant matched to what crosses it and how much it moves. Sites like Western Isles Hospital, 4.9 miles south-west of Bac, carry ambulances, deliveries and visitors’ cars over their road and deck joints.

Bac is in Na h-Eileanan Siar. Any commercial site in Bac is covered, whether it’s a single job or part of a planned programme. We work across 87 places in Na h-Eileanan Siar, from busy centres to rural villages.

Business premises anywhere in HS2 are within our area for movement joints. Streets here include Broadbay View, Rathad na Sgoile and Rathad an T-Seann Sgoil, and sites on any of them can send details for a fixed quote. Close to Bac, our area also takes in Upper Coll (2 miles south-west), Aird Tong (2 miles south-west), Tong (3 miles south-west), Steinis (4 miles south-west) and Newmarket (4 miles south-west). Among the larger centres in Na h-Eileanan Siar is Bac, and we take on movement joints for its commercial and public buildings. Island and remote sites need extra planning, with travel, ferry crossings where needed and weather to allow for, so give the site location in your enquiry.

Landmarks near Bac

Other landmarks nearby include Western Isles Hospital (4.9 miles south-west). Green spaces nearby include Loch Langavat.

Map of Bac © OpenStreetMap contributors

What happens if it’s left?

Leaving a failed movement joint rarely stays a small problem. Water and debris get in, the joint jams and the edges spall and the job grows to repairs as well as sealing. Resealing early keeps the work to sealant. Buildings that aren’t in daily use, such as halls and seasonal premises, may let water in unnoticed, giving water time to get in. Early resealing prevents it.

There’s no price list, since every building and every scope is different. Call for a quote.

Why appoint us

  • Fully insured
  • Colour agreed before work starts
  • Health and safety: CHAS accredited
  • Coloured sealants to suit the setting, where available

See our cost guide and our accreditations.

After the work

To get the most from the new sealant:

  • Keep product details with the building records for the next reseal
  • Check joints after long freezing spells
  • Sweep decks, ramps and floors so grit doesn’t collect in the joints
  • Treat a small split as a warning, not a cosmetic issue

Add every elevation, deck and floor joint to your inspection round. Early splits and edges starting to lift show up on a routine check, when they’re still cheap to deal with. If anything looks wrong, phone 01277 525 020 or use the quote form with photos.

When one joint fails, others of the same age are rarely far behind. It pays to check every joint, not just the obvious one. We’ll tell you which movement joints need doing now and which can wait.

Questions we’re asked in Bac

Can you work on a hospital site such as Western Isles Hospital?

Yes, hospitals are one of the sectors we cover. Work is phased so departments keep running, under the site’s own rules.

Can you take on a job in Bac, on the island?

Yes. Islands are part of our area, Bac included. Island work is planned around ferry crossings and the weather, so photos and a full list before we travel are essential.

Do you reseal car park expansion joints?

Yes. We use a sealant designed for wheel loads and the expected movement.

What sealant do you use in movement joints?

It depends on the movement, exposure and traffic. Low-modulus neutral-cure silicone suits many facade joints, while polyurethane is common in trafficked floor and deck joints.

Does the weather affect the work?

It can, for external work. Sealant won’t bond properly to a wet or frosty joint, so we watch the forecast and rearrange outside work if we have to. Indoors, the weather is rarely a problem.

Are you insured?

Yes. We are fully insured, and the certificate can go with your quote.

Do the joint edges need to be sound before sealing?

Sound edges are essential. Where they’ve broken up, we’ll tell you they need repairing first.

Accreditations

Trusted. Accredited. Insured.