Mastic sealing for building owners and managing agents in Knightwood, Hampshire
Mastic sealing for Knightwood, from a contractor working since 2005. Fully insured and CHAS accredited.
- A mix of products and colours from past repairs
- Complaints coming in block by block
- Communal area joints that look neglected
Mastic sealing across Knightwood
Send drawings, photos or a joint schedule, or tell us about the site, and we’ll come back with a fixed quote.
When to bring in a specialist
Site maintenance staff can often handle a short internal joint. Where it goes wrong is preparation: sealing over old material, sealing onto damp or dusty surfaces, or a product that can’t take the movement.
Certain joints really need a specialist: for example fire-rated seals that must match a tested detail, trafficked floor joints and external movement joints. A poor seal in places like these tends to cost more to put right later.
How we handle mastic sealing in Knightwood
In buildings from before 2000, some old mastics contain asbestos. Before we disturb it, we ask to see the asbestos register or survey and if it’s suspected, work stops until it’s tested. Removing asbestos-containing material isn’t something we do. If you have draught complaints from residents or tenants and open joints in brickwork or panels, we can put it right, whatever the surface. A specialist sealant contractor works differently from a general builder: in Knightwood, that means joint design, primers and backing rod as standard.
Older buildings and conversions around places like Knightwood mix old masonry with newer frames. Perimeter joints need a sealant that suits both frame and masonry.
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
- Knightwood (SO53, SO52)
- Wider area
- Hampshire
- Cover
- 12 months on our workmanship
- Price
- Quoted before any work starts
- Phone
- 01277 525 020
- Page updated
- 3 November 2026
After the work
Cleaning and maintenance staff play a part too. Pass these on to them:
- Encourage occupiers to report problems at frames
- Track which buildings were done and when
- Mention RAMS, insurance or CSCS requirements up front
- Prioritise elevations facing the weather
Encourage occupiers to report water or draughts at frames. Early reports catch failures before damage spreads.
Water getting in round frames can damage plaster, decoration and the frames themselves. Resealing early keeps the job small.
How a job runs
We schedule the visit to fit the site hours and access windows you give us. On the day, the work area is kept contained and tidy, and we check in with your contact before moving on to each new area. Work in places the size of Knightwood is planned as a single visit where we can. Clear photographs and measurements help us bring the right products.
- 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.
- Failed sealant is removed and the faces prepared.
- Joints are resealed and tooled.
- Each building is checked and signed off with the 12-month guarantee.
Before we start on site
- Clear stock, furniture or equipment away from the joints
- Tell staff and tenants when we’ll be in
- Confirm the product named in the specification
Ask for a quote
A handful of photographs and a postcode is the fastest way to a quote. Send them through the quote form, or speak to us on 01277 525 020 or send photos by email to discuss it first.
Advice
Towns and villages near Knightwood
Other services in Knightwood
Questions we’re asked in Knightwood
Is Knightwood off your patch?
Not at all: smaller places are covered as well as towns. We work across Greater London and the South East. Where we can, we group nearby jobs to make the most of each trip.
We manage a building near Chandlers Ford station. Can you help?
Yes. Blocks of any size are within what we do. We work to your notice and access arrangements.
Do you seal on top of existing sealant?
No. Overlaying old sealant is a frequent cause of early failure, so it all comes out first.
Is mastic sealing guaranteed?
A 12-month guarantee covers our work. It applies to our workmanship rather than damage or problems with the frames.
Do you work for managing agents and housing associations?
We do. Most of our mastic sealing is for agents, factors, housing associations and portfolio landlords and work can be quoted per building or as a whole.
How long do sealant joints last?
It depends on movement, UV and weather, cleaning, traffic and the product. Treat them as maintenance items and inspect them regularly.
Who decides which product is used?
A specification, where there is one, decides it. If there isn’t one, it comes down to the joint: its movement, its surfaces and what it has to cope with.
What the job involves on each surface
Communal areas
Communal areas stay in use while we work. We work in sections so access is never blocked.
Window and door perimeters on blocks
Frames vary from uPVC to aluminium and timber, and the product is matched to the frame material and the masonry. We’ll confirm the colours available for the specified product.
Blocks and managed buildings in Knightwood
The South East is one of the drier parts of the UK. Outside work still depends on dry joints, and elevations facing the sun and the prevailing weather are normally where frame mastic ages first. Central London is about 67 miles from Knightwood. Within reach of London, blocks run by agents and associations are common around stations.
If you’re responsible for a building such as St Francis, frame and door mastic needs the same attention as any other property. Property owners at sites such as Monks Brook Industrial Park (0.6 miles south-east of Knightwood) can have mastic renewed between lettings.
Knightwood is about 1 mile west of Chandler's Ford, in Hampshire. Knightwood sits inside our coverage, and jobs here get the same fixed quote and 12-month guarantee as anywhere else. Across Hampshire, 723 places are covered, including Knightwood.
Anyone looking for mastic sealing in SO53 and SO52 gets the same process as the rest of our area: send details, get a quote, we seal, guaranteed. Streets here include Foyle Road, Harvest Road and Flexford Road, and sites on any of them can send details for a fixed quote. Close to Knightwood, our area also takes in Chilworth Old Village (2 miles south-west), Chilworth (2 miles south), North Baddesley (2 miles west), Toothill (3 miles south-west) and Bassett (3 miles south). A short drive away, we cover Winchester (6 miles north-east), Eastleigh (3 miles south-east), Fareham (13 miles south-east), Totton (7 miles south-west), Hedge End (7 miles south-east) and Romsey (4 miles west).
Near you in Knightwood
Around Knightwood, our work takes us to commercial buildings near Toynbee School, among other places. Knightwood’s nearest station is Chandlers Ford station, about 0.8 miles south-east. Other landmarks nearby include Romsey Community Hospital (3.5 miles west) and Eastleigh Museum (2.5 miles south-east). Green spaces nearby include Flexford Nature Reserve.
Commercial clients in Knightwood
CHAS accredited and a Constructionline member, we make supplier vetting simple. Our insurance certificate can be sent along with the quote.
Blocks and communal areas make up much of the work for housing associations and agents. Work can be phased so residents and staff keep access throughout, with each stage agreed with your site contact.
Signs you need mastic sealing in Knightwood
Occasionally the substrate fails, not the sealant, such as crumbling render, brick arrises or frame edges. We’ll tell you if the joint edges need repairing before resealing.
If one of these sounds familiar, it’s time for a closer look:
- Repeated reactive repairs to the same buildings
- Damaged joints in communal entrances and corridors
- Damp patches beside frames
- Draughts at frames across a block
For a school such as Knightwood Primary School, perimeter mastic on windows and doors is a holiday job.
Before you book anyone
- Is depth set with backing rod, or bond-breaker tape in shallow joints?
- Which product they’ll use, and why it suits the joint
- Whether primer will be used where the manufacturer specifies it
- Are they CHAS accredited or on Constructionline?