Mastic Sealing in Back
Planning work on a mastic joint in Back? We assess it, carry out the work and guarantee our workmanship for 12 months.
- Failed external movement joints
- Brittle perimeter mastic across a building
- Water getting in round frames after rain
Mastic sealing near Back
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
About our mastic sealing in Back
In buildings from before 2000, some old mastics contain asbestos. We check the asbestos register or survey before any old sealant is cut out and if it’s suspected, work stops until it’s tested. Removing asbestos-containing material isn’t something we do. We work on external wall and movement joints, communal entrances and stairwells and communal kitchens and washrooms, and what we are called in for most is open joints in brickwork or panels and communal area joints that look neglected. Most enquiries from Back start with one failed joint and grow into a wider look at the building: we look at the rest while we are there and tell you what we find.
Outside mastic in Scotland needs dry joints and the right temperature, so work around Back is planned with the forecast. We agree a window with some flexibility.
The 12-month guarantee covers our workmanship: preparation, application and finish. It doesn’t extend to damage, other trades’ later work or movement the joint was never designed to take.
- Location
- Back (HS2)
- Wider area
- Na h-Eileanan Siar
- Cover
- A 12-month guarantee
- Price
- Quoted before any work starts
- Phone
- 01277 525 020
- Last updated
- 3 November 2026
Diagnose, treat, sign off
We follow your site rules from the start: signing in, inductions and any permit to work. Once we are cleared to begin, the joints are worked through in the order agreed with your site contact. Travel to smaller Scottish places like Back is planned so the job is finished in one visit where possible, so photographs, sizes and a full list matter. Outside work also needs a suitable weather window.
- First comes a look at the joints and, for older buildings, the asbestos records.
- The products and programme are set out in a fixed quote.
- Failed mastic is removed completely.
- The joints are prepared and resealed with the right product.
- We finish each building before moving to the next.
Getting the site ready
- Tell us which areas need to stay in use
- Clear stock, furniture or equipment away from the joints
- Share your working hours and any access restrictions
Quotes
A handful of photos and a postcode is the fastest way to a quote. Send them through the quote form, or call the office on 01277 525 020 or use the quote form if you’d rather talk the job through.
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Quoting for work in Back
Your fixed quote is built from the real scope. It takes account of:
- Backing rod, priming and other preparation
- Removal of failed or old sealant
- How accessible the joints are
- Phasing around occupants
We don’t publish prices, because the scope varies so much from one building to the next. Call for a quote.
What to include in your enquiry
We can often quote from photos and a few details. It helps to include:
- Clear photos of the problem areas
- How the joints are reached, and at what height
- Approximate linear metres or a joint schedule
- Specification clauses that apply
A good quote starts with a clear picture: the joints involved, quantities, access and the product called for. Send what you have, and we will arrange a site visit if anything is unclear.
Towns and villages near Back
More services for Back
Questions we are asked in Back
Does the sea air around Back change the choice of sealant?
It can. Driven rain and salt are tougher on outside sealant than sheltered inland conditions. We check the specified product suits the exposure and pay close attention to preparation.
Can you quote for mastic across several buildings in and around Back?
Yes. Planned programmes across a building, block or estate are a core part of this service. Send the addresses and photos and we’ll give a fixed quote.
Which sealant will you use?
Where there’s a specification, we use the product it names. If not, we choose for the movement, the surfaces and the conditions, in line with the manufacturer’s guidance.
How do you handle work on occupied blocks?
We plan around people living or working in the building. Dates and areas are agreed with you so residents or tenants can be told, and entrances stay in use.
Do you check for asbestos in old sealant?
We don’t remove asbestos-containing materials. If old sealant is suspected, work stops until it’s tested, and the duty to manage asbestos sits with the dutyholder.
How long do sealant joints last?
There isn’t a single answer, since movement, weather, cleaning and use all affect it. Regular checks let you plan resealing before leaks or damage.
Is it fine to apply new sealant on top of old?
No. We cut the old material out and clean the joint back before sealing, since fresh sealant will not bond reliably to aged material.
What we’re called out for in Back
Topping up old mastic is a common shortcut. New silicone has nothing to grip on old silicone and the repair soon fails.
What tends to prompt an enquiry:
- Window mastic that has split and shrunk
- Damp patches beside frames
- Patchy repairs in mismatched sealant
- Movement joints with sealant missing
For owners and agents with buildings in or around Back, block-wide mastic programmes deal with frames and external joints of the same age together.
Before you book anyone
- How the existing material will be dealt with
- Who will actually carry out the work
- What site paperwork they can supply
- Is the sealant right for the movement and the substrate?
Frames, entrances and external joints in Back
With the shore within about 1 mile, Back counts as a coastal location. On buildings near the shore, the side facing the weather usually needs its mastic renewed first; plan inspections around that. The west of Scotland, where Back is, gets more rain than the east. The weather side of a block typically needs attention first. Outside mastic goes on in dry spells, with some flexibility in the programme.
Wherever your building is in or near Back, we look at the whole elevation before quoting, so you know what needs doing now.
Back is about 6 miles north-east of Stornoway, in Na h-Eileanan Siar. Commercial clients in Back can call on us for mastic joints. 87 places across Na h-Eileanan Siar fall within our area, including Back.
Work on mastic joints is covered throughout HS2. Buildings on Broadbay View, Rathad na Sgoile and Sraid na H-Eaglaise are within our area for mastic joints. Just outside Back, we also work in Sulaisiadar (5 miles south-east), Garrabost (5 miles south-east), Na h-Eileanan an Iar (5 miles south), Knock (5 miles south) and Aiginis (5 miles south). Remote and island addresses take more planning, from travel and ferries to the weather, so give the site location in your enquiry.
What’s near Back
Well-known places in the area include Western Isles Hospital (5.4 miles south-west). For a walk, there’s Loch Langavat.
What happens if it’s left?
Sealing over failed mastic looks tidy for a while. It won’t grip the old sealant and soon comes away. Full removal and proper preparation is what lasts. Renewing every failing joint on one visit is the sensible approach for a place like Back. Photos of each area help us quote the whole job.
Small jobs and large programmes are priced from the same things: what’s in scope, how we reach it, what’s specified and when it needs doing. Call for a quote and we will put a fixed figure on it.
Why choose Mastic Doctor in Back
- Old sealant cut out, never sealed over
- Products installed to the manufacturer’s instructions
- One phone line for London, the South East and Scotland
- CHAS accredited
See how commercial sealant jobs are priced or how we’re accredited.
Doing it in-house
The visible bead is only part of the job. Correct depth, the right primer and a sealant matched to the movement are where general trades tend to cut corners.
A short, simple internal joint is often within reach of a maintenance team. Where it goes wrong is preparation: new sealant over old, damp or dusty faces, or the wrong product for the movement.
When it isn’t the sealant
A few problems need another trade or a different fix, and we say so rather than covering them up:
- Materials that need asbestos testing before work
- Substrate edges that need repairing first
- Frames that are rotten, warped or broken
Not sure which it is? You can speak to us on 01277 525 020 or email the details over and we’ll tell you honestly.
Surfaces we seal
- Communal kitchens and washrooms
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Balcony and threshold joints
- External wall and movement joints
- Window and door perimeters on blocks