Alverstoke mastic sealing
Mastic sealing for Alverstoke, from a contractor working since 2005. Fully insured, with a 12-month guarantee.
- Cracked, hardened mastic round windows on a block
- Occupiers reporting cold air round windows
- A mix of products and colours from past repairs
Mastic sealing for Alverstoke sites
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
Mastic sealing in Alverstoke: the local picture
Alverstoke lies within about 1 mile of the sea. For owners and agents with buildings near the sea, exposed elevations are where frame mastic fails first, so it’s worth inspecting those sides more often. The South East is one of the drier parts of the UK. Even so, frame mastic only goes on in dry, workable conditions, while the elevations that take the most sun tend to show hardened mastic first.
Older community buildings, The Little Church among them, often have frames of mixed ages whose mastic varies. For owners of several units at places like QinetiQ Haslar Marine Technology Park, 1 mile north-east of Alverstoke, one programme can deal with frame and external mastic across the lot. Student blocks close to universities like University of Portsmouth - North Zone (2.6 miles north-east of Alverstoke) are easiest to work on between tenancies.
Alverstoke is about 2 miles south of Gosport, in Hampshire. Alverstoke sits inside our coverage and the rest of Hampshire, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. Our Hampshire coverage takes in 723 places, large and small.
Postcode districts covered here: PO12. We cover commercial and managed buildings on The Lane, Fort Road and Church Road and the roads nearby. If your building is just outside Alverstoke, we cover Clayhall (1 mile east), Haslar (1 mile east), Privett (1 mile north-west), Portsmouth Point (2 miles north-east) and Portsea (2 miles north-east). Further afield, our area takes in Havant (9 miles north-east), Fareham (5 miles north), Horndean (11 miles north-east), Hedge End (12 miles north-west), Waterlooville (9 miles north-east) and Purbrook (8 miles north-east).
Local landmarks in Alverstoke
We work on buildings around Bay House School and Village Home pub and the streets around them. The closest station to Alverstoke is Portsmouth Harbour station, roughly 2.1 miles north-east of the centre. A little further out are Tricorn Centre (3 miles north-east) and Gosport War Memorial Hospital (0.9 miles north). Not far away are West of the River Alver.
Mastic sealing in Alverstoke, done properly
Older blocks and commercial buildings can have mastic that contains asbestos. Before we disturb it, we ask to see the asbestos register or survey, and work stops for testing if there’s any doubt. Removing asbestos-containing material isn’t something we do. Site teams most often ask us about occupiers reporting cold air round windows and movement joints with sealant missing, across balcony and threshold joints, window and door perimeters on blocks and communal kitchens and washrooms. Sealant applicators who only do sealant are a different proposition from a general trade with a gun in the van: on jobs in Alverstoke, preparation and product choice get the time they need.
Owners and agents with buildings around smaller places such as Alverstoke tend to manage small terraces of association properties, converted barns and commercial units. Mastic around frames and on external joints wears out in time, whatever the building.
Guaranteed is the last step of every job. Our workmanship is backed for 12 months, and the quote explains what it covers.
- Where
- Alverstoke (PO12)
- Region
- Hampshire
- Guarantee
- A 12-month guarantee
- Quote
- A fixed quote before we start
- Phone
- 01277 525 020
- Updated
- 3 November 2026
Doing it in-house
Paperwork matters too. Many sites expect CSCS cards, RAMS and proof of insurance, and our CSCS-carded applicators are used to working under those rules.
Some joints are best left to specialists: fire-rated seals that must follow a tested detail, trafficked floor joints and external movement joints among them. Getting these wrong usually costs more in the end than doing them right.
Why it’s worth doing now in Alverstoke
Mixed repairs by different contractors leave a patchwork of products and colours. Resealing a whole building gives a consistent finish and one 12-month guarantee. Converted and older buildings near places like Alverstoke tend to move, and aged sealant cracks. The right product, sized to the joint, copes much better.
Whether it’s a single area or a whole estate, the same things set the price: scope, access, product and programme. Call for a quote and we’ll put a fixed figure on it.
What you get with us
- Colours chosen to suit frames, cladding or finishes where possible
- CSCS-carded applicators
- 12 months’ guarantee on every job
- Work to your specification and the manufacturer’s guidance
Take a look at our cost guide and how we’re accredited.
Keeping the joints sound
Once the work is signed off, a little attention goes a long way:
- Track which buildings were done and when
- Check sealant joints during planned building inspections
- Group repairs into a planned programme
- Encourage occupiers to report problems at frames
Log the date and extent of the resealing for each block. That makes future programmes easier to plan and shows what was done.
One failed perimeter normally means others on the same building are close so a single failure is a sign to check the rest. Doing them together saves going back again and again.
Also in Alverstoke
How a job runs
Our CSCS-carded applicators arrive with the sealants, primers and backing rod the job calls for. Any old material is cut back to clean, sound faces, primer goes on where the manufacturer specifies it, and the sealant is tooled off neatly. Jobs in and around smaller places like Alverstoke are normally planned as a single visit, so photographs and measurements up front really help. That way the right products come on the day.
- First comes a look at the joints and, for older buildings, the asbestos records.
- A fixed quote covers the joints, products and order of work.
- Failed mastic is removed completely.
- Joint faces are cleaned, backed and resealed.
- Buildings are completed in turn.
Preparing the site
- Tell us what induction or permit system the site runs
- Warn occupants and staff about the work
- Share your working hours and any access restrictions
Ask for a quote
Photos, drawings or a schedule of the joints and a fixed quote comes back to you. If the job needs a look first, we will arrange a site visit.
Related advice
Alverstoke: questions and answers
We manage a building near Portsmouth Harbour station. Can you help?
Yes. Blocks of any size are within what we do. Send the address, photographs of the elevations and your access arrangements, and we will give a fixed quote.
Is a smaller place like Alverstoke outside your area?
Not at all: smaller places are covered as well as towns. Our area covers London and the South East counties. Send photographs and a list of what needs doing, and we will plan the job to need as few trips as possible.
Will you just go over the old sealant?
No. Sealing over old material is one of the classic causes of early joint failure, so everything comes out first.
Can you seal joints high up on a block?
We talk through access for each building when we quote. Tell us the building height and any access already in place and we’ll confirm the approach in the quote.
Will residents or tenants be disturbed?
Occupiers stay in the building throughout. We flag any areas that need internal access well before the dates so you can arrange it with occupiers.
Do you supply RAMS and insurance details?
Tell us what site paperwork you need (RAMS, insurance certificate, CSCS details) and we’ll confirm with the quote. We are CHAS accredited and a Constructionline member.
Is asbestos a concern with old mastic?
In older buildings, old mastic can contain asbestos. We check the asbestos register or survey before disturbing it and suspect material is tested first.
What affects the price in Alverstoke
To price the job, we consider:
- Travel to remote or island sites
- Whether old sealant has to be cut out first
- The size and state of each joint
- Specialist products, such as fire-rated or hygienic sealants
Access often affects the price as much as the sealing: easy-to-reach joints are quicker than those that need equipment to get to. Mention the access as part of your enquiry.
What we need to price the job
Whether it’s one area or a whole building, these details speed things up:
- The postcode of the building
- Approximate linear metres or a joint schedule
- Access details, including height
- The type of building and who uses it
A handful of photos and a postcode is the fastest way to a quote. Upload them with the quote form, or call the office on 01277 525 020 or email us if you’d rather talk the job through.
Commercial clients in Alverstoke
Planned maintenance programmes are welcome: resealing failed joints building by building, on a schedule that suits your budget. Alverstoke can form part of a wider programme across Hampshire.
We work for building owners and managing agents on everything from one building to a spread of sites. Several sites can go on one quote, which keeps the paperwork simple.