Haslar mastic sealing
We carry out mastic sealing for building owners, managing agents and housing associations in Haslar and the surrounding area. Send photos or drawings for a fixed quote.
- Brittle perimeter mastic across a building
- Communal area joints that look neglected
- The same joint failures repeated across a portfolio
Mastic sealing for businesses in Haslar
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 Haslar, done properly
We work for building owners, landlords with commercial or block portfolios, managing agents and housing associations. A planned, building-by-building programme often works better than reacting to each complaint, with each block quoted and scheduled in turn. We work on balcony and threshold joints, communal entrances and stairwells and external wall and movement joints, and the failures we are asked to look at most are open joints in brickwork or panels and worn sealant at communal door frames. Most enquiries from Haslar start with one failed joint and grow into a wider look at the building: we check the joints around it and give you an honest view of what needs doing now and what can wait.
For buildings around smaller places like Haslar, we group work so one trip covers it. Photos of each elevation help us quote accurately.
Our 12-month guarantee is about workmanship, not wear and tear. How long a sealant joint lasts depends on movement, exposure, cleaning and use, so we’re clear about what is covered before work starts.
- Location
- Haslar (PO12)
- Region
- Hampshire
- Guarantee
- A 12-month guarantee
- Quotes
- Fixed quote, scope in writing
- Call
- 01277 525 020
- Last updated
- 3 November 2026
On site: what to expect
On arrival, we report to your site contact and complete whatever induction the building runs. Everything around the joints gets protected before any cutting starts, and the work normally takes anything from a day to a few weeks, depending on the number of buildings and joints. If others near Haslar need work, visits can be combined, which keeps travel down. You’ll have a fixed quote before work starts.
- First we look at the mastic on each building and note what needs replacing.
- We send a fixed quote that sets out the joints, the products and the programme.
- The programme is fixed with you, including dates you can pass on to residents or tenants.
- Old sealant is stripped and each face prepared back to firm material.
- Deep joints get backing rod, faces are primed if the manufacturer specifies it, then the joint is sealed and tooled.
- Completed joints are inspected and carry a 12-month workmanship guarantee.
Getting the site ready
- Warn occupants and staff about the work
- Have the specification and drawings to hand
- Explain the parking and delivery arrangements
Request a quote
Tell us about the building, the joints and when you need the work done, and a fixed quote will follow. To get it moving, speak to us on 01277 525 020 or email us.
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What we’re called out for in Haslar
UV and rain age external sealant. It stiffens, stops stretching and cracks most of all on the sunniest and most exposed elevations.
What tends to prompt an enquiry:
- Window mastic that has split and shrunk
- Damaged joints in communal entrances and corridors
- Open joints in brickwork or panels
- Draught complaints from residents or tenants
If you are responsible for a building such as St Francis, frame and door mastic needs the same attention as any other property.
Before you book anyone
- Will failed sealant be removed rather than covered?
- What level of public liability insurance do they hold?
- How they’ll work around occupants
- What site paperwork they can supply
How the quote is worked out
The price varies from site to site. Expect it to depend on:
- Quantities, in metres or numbers
- Which sealant the job calls for
- Induction, permit and paperwork requirements
- Any access equipment needed
The price depends on how many linear metres there are, how much old material needs removing and how the joints are reached. Call for a fixed quote when you are ready.
What to include in your enquiry
Whether it’s one area or a whole building, the same details help:
- Asbestos survey details if the building is older
- What the building is and how it’s used
- The site address and postcode
- Any specification or named product
Specifications, drawings and tender packages are welcome with any enquiry, and we will price the work to it. Smaller jobs need nothing more than photographs and a few notes.
When to bring in a specialist
Using site staff can make sense for a small touch-up, but larger jobs are different: a specialist brings efficiency, a consistent finish and a 12-month guarantee.
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.
Common questions from Haslar clients
Can you quote for a block close to Portsmouth Harbour station?
Yes, we work for agents, landlords and housing associations with blocks of every size. Send the address, photos of the elevations and your access arrangements, and we’ll give a fixed quote.
Will you take on work at estates like QinetiQ Haslar Marine Technology Park, close to Haslar?
Yes. Estates, retail parks and business parks around Haslar, QinetiQ Haslar Marine Technology Park among them, are all within reach. Send details of the unit and the work through our quote form for a quick quote.
Do you work for managing agents and housing associations?
Yes, that’s exactly who this service is for. We work through buildings in a planned order with dates agreed in advance.
Do you do block-wide mastic programmes?
Yes, planned programmes suit estates and portfolios. You get a fixed quote per building or for the whole job.
Do you work to architects’ specifications?
Yes. The specification and the manufacturer’s installation guidance are what we work to, and any queries are raised before we start.
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 communal access is kept open.
How long will the new sealant last?
There’s no fixed lifespan: movement, exposure, cleaning, traffic and the product all play a part. Treat them as maintenance items and inspect them regularly.
What we can’t put right
Our job is the joint, not everything around it. Sealant alone won’t deal with:
- Roof leaks, gutters or failed flashings that aren’t sealant joints
- Leaks through the frame itself rather than the perimeter
- Glazing that needs replacing
If in doubt, call the office on 01277 525 020 or email drawings and photos and we will say what we think before you book.
What we seal
- Communal entrances and stairwells
- Shopfronts below residential blocks
- Communal kitchens and washrooms
- External wall and movement joints
- Balcony and threshold joints
- Window and door perimeters on blocks
Looking after buildings in and around Haslar
Haslar is within about 1 mile of the coast. For owners and agents with buildings near the sea, exposed elevations are where frame mastic fails first. Haslar has six care or nursing homes no more than 2 miles away. Care home owners need frame and external mastic kept sound without unsettling residents.
Owners of student blocks near University of Portsmouth - North Zone, 1.9 miles to the north-east of Haslar, can schedule frame and external mastic for the summer vacation. Landlords with units on estates such as QinetiQ Haslar Marine Technology Park (to the north of Haslar) can bring frame, door and external mastic across several units into one programme.
Haslar is about 2 miles south-east of Gosport, in Hampshire. Across the PO12 postcode area, it works the same way: details in, fixed quote out, then sealing and a 12-month guarantee. Across Hampshire, 723 places are covered, Haslar among them.
Anyone looking for mastic sealing in PO12 gets the same process as the rest of our area: details, then a fixed price, then sealing and a 12-month guarantee. We cover commercial and managed buildings on Froude Road, Military Road and Monckton Road and the roads nearby. Sites close to Haslar are covered too, including Clayhall (1 mile north-west), Alverstoke (1 mile west), Portsmouth Point (1 mile north-east), Privett (2 miles north-west) and Portsea (2 miles north-east). Bigger towns within reach include Havant (8 miles north-east), Fareham (6 miles north-west), Horndean (10 miles north-east), Hedge End (12 miles north-west), Waterlooville (8 miles north-east) and Purbrook (7 miles north-east).
What’s near Haslar
Around Haslar, our work takes us to commercial buildings near The Fighting Cocks pub, Bay House School and St Vincent College and the streets around them. For rail, the closest station is Portsmouth Harbour station, roughly 1.5 miles north-east. Well-known places in the area include Tricorn Centre (2.3 miles north-east) and Southsea Castle (1.8 miles east). For a walk, there’s West of the River Alver.
Building owners, agents and FMs in Haslar
For main contractors, we work as the sealant subcontractor, on new build and refurbishment alike. We work to your programme, your specification and your site rules, and our applicators hold CSCS cards.
Housing associations and managing agents often need work done across blocks and communal areas. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.