Hampshire · England
Crampmoor Window Mastic
Window mastic across Crampmoor and nearby, with every bit of old sealant taken out first.
- Whistling draughts around closed windows
- Leaking joints at the ends of sills
- Hard, cracked sealant around windows
Window mastic in Crampmoor
Most frames have an outside joint and an inside one. Outside, the mastic keeps rain out; the internal joint closes the gap to the plaster and stops draughts. We seal one or both, depending on what’s needed. We work on patio & French doors, aluminium frames and window sills, and common reasons people get in touch are draughts coming in around windows and doors and water coming in at the bottom corners of a door.
Homes in small places like Crampmoor often stand in the open, with little to shelter their windows from wind and rain. Exposed frames and sills lose their mastic sooner than sheltered ones.
A one-year guarantee comes as standard, so you are covered after we’ve gone.
- Where
- Crampmoor (SO51)
- Wider area
- Hampshire
- Guarantee
- A year, on every job
- Quotes
- A clear price before any work starts
- Call
- 0345 464 0079
- Updated
- 26 October 2026
Keeping the joints in good condition
Simple care keeps the joints in good condition. We recommend:
- Clear any debris from frame drain holes
- Look round the frames every year or so
- Do not use solvent cleaners on the joint
- Keep jet washers away from the mastic
Silicone cannot generally be painted, so mention any painting plans before we start. There are paintable sealants for joints that need it.
Water trapped behind a failed joint can start rot in timber frames and sills. Once wood has rotted, it needs repair before it can be sealed, so early resealing is worth it.
What we do, step by step
On the day, we look over the joints with you first, so you know exactly what we’re doing. Surfaces next to the work are protected before work begins. Most jobs take most of a day for a typical house, less for a few frames. Somewhere like Crampmoor needs a little journey planning: tell us about narrow lanes, gates, long drives and where we can park. We bring what the job needs, so it can be finished in one trip where possible.
- First we look at every frame and agree the list.
- The old mastic is cut out and the surfaces cleaned back.
- We fit backing rod in deep gaps so the sealant is the right depth.
- New exterior sealant goes on in a matching colour and is tooled smooth.
- Every joint is checked before we leave.
Getting ready for the visit
- Keep children and pets away from the work area
- Tell us about any previous sealing or DIY attempts
- On commercial sites, let us know about site rules
How to get a quote
If you are in Crampmoor and need window mastic, call 0345 464 0079 or email us. Tell us what the problem is and where, and we’ll agree the price before any work begins.
Advice
When something else is needed
To be straight with you, some problems need a different trade:
- Soft or decayed wood in the frame
- Draughts through the window seals rather than the frame
- Penetrating damp from a failed cavity tray or render
If you are not sure, just phone 0345 464 0079 or email us and we will give you a straight answer.
Where we work in Crampmoor
- Window sills
- Patio & French doors
- Timber windows & doors
- uPVC windows
- Composite doors
- Aluminium frames
What we’re called out for in Crampmoor
Frames are never completely still. Sun on a frame makes it expand, and it contracts again overnight, while the brick or render around it hardly moves. A sealant that can’t keep up eventually tears.
It’s worth asking for a quote if you see:
- Gaps where the sill meets the wall
- A bead that doesn’t match the frame
- Hard, cracked sealant around windows
- Gaps left after new windows were fitted
For an older house near a landmark such as St Swithun's Church, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint.
Questions to ask before booking
- Are they insured?
- What product goes in the joint
- What preparation is included
- How the colour is chosen
Crampmoor questions
Do you cover smaller places like Crampmoor?
Yes, we do. We work across London and the South East, and smaller places are part of that. Longer journeys are simply planned in advance.
Can you help a landlord with a rental near Romsey station?
Yes, rental work is part of what we do. You can ring 0345 464 0079 or send us an email with the address and a few details, and we’ll give you a fixed price before we start.
Can you do the inside joint as well?
Yes, we do both. Indoors, we seal between the frame and the plaster or reveal.
How long does it take to reseal the windows on a house?
Allow a few hours for a few frames, or a day or more for a whole house. Access and how stubborn the old mastic is affect the time most.
Will you leave a mess?
We keep the work tidy. We protect what’s around the joints, and we clear up when we’re done.
Will there be a smell?
Sometimes, a little. It fades as the sealant cures.
Can I paint over the new sealant?
That depends on the product. Silicone isn’t paintable, but some hybrid sealants are. Tell us if you are decorating and we will choose accordingly.
Do I have to be there?
For indoor joints, yes, someone needs to let us in. Once we’ve agreed the job, you do not need to watch us work.
Landlords, agents and businesses in Crampmoor
From a single let to a portfolio, you get the same standard of work: old sealant fully removed, joints prepared properly and a one-year guarantee.
Letting agents often deal with us directly. Tell us the address, the job and how access works and we will give you a quote.
Window mastic in Crampmoor: local notes
The South East is one of the drier parts of the UK, but outside sealant still needs a dry, clean surface, so outdoor work is planned around the forecast. With historic houses such as Mottisfont Abbey (about 4.4 miles north-west) nearby, there’s older building stock in the area around Crampmoor as well as newer homes. Where a home is older, older frames set in brick or stone need a sealant that suits them, and sometimes that is traditional sand mastic.
Rented homes near Romsey station change hands often, and renewing tired window mastic between tenants heads off draught and damp complaints. Managing a site like Cupernham Infant School? Then larger buildings have plenty of frames, and the mastic around each one ages.
Crampmoor is about 1 mile north-east of Romsey, in Hampshire. If you need window mastic in Crampmoor, it’s easy to get a quote: please phone 0345 464 0079 or send us an email. We cover Hampshire from our Crawley base, Crampmoor included. Crampmoor is one of 683 places in Hampshire where we work for window mastic. For nearby work, see our Southampton page (6 miles or so).
All of SO51 is covered for window mastic, from the main roads to the quietest streets. Local streets include The Straight Mile and Crampmoor Lane, all of which we cover. Nearby, we also carry out window mastic in Gosport (1 mile east), Ampfield (1 mile east), Abbotswood (1 mile west), Braishfield (1 mile north) and Knapp (2 miles north-east). Further out, we also cover Winchester (7 miles north-east), Eastleigh (5 miles south-east), Fareham (15 miles south-east), Andover (14 miles north), Totton (6 miles south) and Chandler's Ford (3 miles south-east).
Landmarks near Crampmoor
We work in homes and buildings around The Mountbatten School and Hunters Inn Public House and the streets around them. For rail, the closest station is Romsey station, roughly 1.8 miles south-west. A little further out are Romsey Community Hospital (1.4 miles south-west) and King Johns House (2.2 miles south-west). Open spaces near Crampmoor include Emer Bog and Baddesley Common.
Towns and villages near Crampmoor
Other services in Crampmoor
Surface by surface
Window sills
Masonry sills can have joints where water gets in, and the joint under the frame can let rain run behind. Those are sealed with a product suited to stone or concrete.
Composite doors
Composite doors are normally hung in an uPVC-type frame, and the joint around it is sealed like a window. The bead is colour-matched to the frame.
Should I try it myself first?
Overfilling a joint is a classic DIY mistake. A heavy bead looks messy and copes badly with movement, and getting the depth right matters as much as the look.
Some sealant jobs are within reach of a careful DIYer, such as a straightforward joint indoors. The common mistakes are sealing over old sealant, sealing a damp joint and using far too much.