Mastic sealing for building owners and managing agents in Crosbost, Na h-Eileanan Siar
Mastic sealing for building owners, managing agents and housing associations in Crosbost and across Na h-Eileanan Siar. CHAS accredited, Constructionline member, with a 12-month guarantee on workmanship.
- Old repairs sealed over failed mastic
- No planned programme for sealant
- Open joints in brickwork or panels
Mastic sealing for Crosbost sites
Tell us what needs sealing and where, with photos or drawings if you have them, and we’ll price it.
Diagnose, treat, sign off
The first thing on site is a walk round with your contact, to confirm the scope, the order of work and any areas we must keep clear. Then we strip out anything that has failed, prepare every joint and seal it. Jobs near Crosbost are often grouped with others in the same area, to make the most of each trip. Tell us how flexible your dates are.
- A building-by-building inspection lists the failed joints.
- The quote is fixed and split as suits you.
- Dates and areas are agreed so occupiers can be told.
- Old mastic is removed and the joint faces prepared.
- Joints are resealed and tooled.
- Each building is checked and signed off with the 12-month guarantee.
Before we start on site
- Tell us which areas need to stay in use
- Let us know about inductions and permits
- Explain the parking and delivery arrangements
Quotes
The quickest route to a quote is a few photographs and the site postcode. Upload them with the quote form, or call 01277 525 020 or email drawings and photos to discuss it first.
Related advice
How we handle mastic sealing in Crosbost
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. We don’t remove asbestos-containing materials. We work on communal kitchens and washrooms, window and door perimeters on blocks and shopfronts below residential blocks, and what we are called in for most is a mix of products and colours from past repairs and water getting in round frames after rain. Looking for mastic applicators who cover Crosbost? Mastic Doctor has worked for contractors, FMs and building owners since 2005, with CSCS-carded applicators.
Outside mastic in Scotland needs dry joints and the right temperature, so work around Crosbost is planned with the forecast. We agree a window with some flexibility.
Guaranteed is the last step of every job. You get a 12-month guarantee on our workmanship, and the quote explains what it covers.
- Where
- Crosbost (HS2)
- Region
- Na h-Eileanan Siar
- Guarantee
- 12 months on every job
- Quote
- Quoted before any work starts
- Telephone
- 01277 525 020
- Page updated
- 3 November 2026
Why deal with it now?
Looking at mastic during planned maintenance costs little. Waiting until leaks appear means working under pressure and less choice about when. Around smaller places like Crosbost, halls, stores and seasonal buildings may not be checked often, so a failed joint has time to cause damage. Early resealing prevents it.
Access often affects the price as much as the sealing: joints within easy reach take less time than ones that need access equipment. Tell us how the joints are reached and call for a quote.
What you get with us
- Constructionline member for supplier checks
- Joints cleaned back to sound surfaces
- Fully insured, including public liability cover
- Colours chosen to suit frames, cladding or finishes where possible
See our cost guide or how we’re accredited.
What the job involves on each surface
Estate-wide resealing programmes
Housing associations and agents often manage many similar blocks. We quote building by building and work through them in turn.
External movement joints
External movement joints take up expansion and contraction. Failed sealant in a movement joint lets water in.
Frames, entrances and external joints in Crosbost
With the shore within about 1 mile, Crosbost counts as a coastal location. For owners and agents with buildings near the sea, exposed elevations are where frame mastic fails first. Crosbost is on Scotland’s wetter western side. The most exposed elevations need checking most often. Programmes allow for wet days.
For owners and agents with buildings in or around Crosbost, block-wide mastic programmes deal with frames and external joints of the same age together. Wherever your building is in or near Crosbost, we look at the whole elevation before quoting, so you know what needs doing now.
Crosbost is in Na h-Eileanan Siar. We cover Crosbost, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. Across Na h-Eileanan Siar, 87 places are covered, including Crosbost.
Business premises anywhere in HS2 are within our area. Sites close to Crosbost are covered too, including North Lochs (1 mile west), Liurbost (1 mile west), Lacasaidh (4 miles south-west), Sandwick (5 miles north-east) and Stornoway (5 miles north). 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.
Local landmarks in Crosbost
Well-known places in the area include Western Isles Hospital (5.9 miles north). The countryside around Crosbost includes Loch na Craoibhe and Nisreaval.
FAQs: Crosbost
Do you take on block-wide or estate-wide mastic work in Crosbost?
Yes. Planned programmes across a building, block or estate are a core part of this service. Send the addresses and photographs and we will give a fixed quote.
Does the sea air around Crosbost change the choice of sealant?
It can. Coastal exposure works external joints harder than inland weather. That puts more weight on product choice, primers where the manufacturer specifies them, and correct joint sizing.
How many days will you need on site?
We plan the time on site around your programme and access. We will give you an estimate of time on site when we quote.
Do you seal on top of existing sealant?
No. Failed sealant is removed and the faces cleaned back to sound, dry material first, since fresh sealant will not bond reliably to aged material.
How long before the joints can be used?
We’ll confirm how long the chosen product needs to cure, and sign any area that should be left alone.
How long will the new sealant last?
There isn’t a single answer, because life depends on how much the joint moves, how exposed it is and how it’s cleaned and used. Regular inspection is the best way to catch problems early.
Can weather delay the job?
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. Internal work is far less affected.
What sealant work can’t fix
Being straight saves everyone time. Fresh joints won’t solve:
- Glazing that needs replacing
- Masonry that has broken away beside the joint
- Asbestos-containing sealant, which we don’t remove
If in doubt, phone 01277 525 020 or send details through our quote form and we will say what we think.
Surfaces we seal
- Window and door perimeters on blocks
- Balcony and threshold joints
- Shopfronts below residential blocks
- Communal entrances and stairwells
- Communal kitchens and washrooms
- External wall and movement joints
For managing agents and facilities managers
If you look after buildings for someone else, clear figures and clear communication matter. We quote a fixed sum, confirm the scope and walk the finished work with you or your representative.
Building owners and managing agents use us on everything from one building to a spread of sites. One quote can cover more than one site, which keeps the paperwork simple.
General trades versus a specialist
For a quick touch-up, site staff may be fine, but anything bigger is another matter: a specialist works through quantities efficiently, leaves a consistent finish and backs it with a 12-month guarantee.
Site maintenance staff can often handle a short internal joint. The usual problems come from preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.