Portsmouth · England
Wymering Sand Mastic
We cover Wymering for traditional burnt sand mastic around sash and case windows and doors in stone and brick. Old sealant removed completely, joints prepared properly and every job guaranteed for a year.
- Cracked mastic round a front door frame
- A silicone bead on a sash window that spoils the look
- Mastic that needs renewing before redecorating
Do you need sand mastic in Wymering?
Shallow joints are a common cause. Mastic that is too thin cracks and drops out, which is why we pack deep voids first and get the depth right.
Any of these means the joints need attention:
- Draughts and rain around sash boxes
- A silicone bead on a sash window that spoils the look
- Cracked mastic round a front door frame
- Failed mastic on an exposed elevation
Schools such as Medina Primary School are buildings too, and larger buildings have plenty of frames, and the mastic around each one ages.
Questions to ask before you book
- Which colour the sealant will be
- Are they insured?
- How much experience the applicator has
- How long the guarantee is
Sand mastic in Wymering
Traditional burnt sand mastic blends with stone and brick surrounds. It suits period and listed homes where a modern sealant bead would stand out. Common call-outs are for tired mastic found when preparing windows for paint and failed mastic on an exposed elevation, on sash and case windows, tenement windows and stone surrounds.
Around Wymering, conservatories, garden rooms and patio doors are often part of the house. Those joints need the same attention as the main windows.
We stand behind the work with a 12-month guarantee, so you are not left on your own once the job is done.
- Place
- Wymering (PO6, PO2)
- Region
- Portsmouth
- Cover
- One year on every job
- Price
- A clear quote up front
- Call
- 0345 464 0079
- Page updated
- 26 October 2026
Nearby places to Wymering
Other services in Wymering
What the job involves on each surface
Tenement and terrace windows
Windows above ground floor need the right access. Tell us the height and we will confirm what’s needed.
Brick reveals
Gaps between frame and brick let in rain and draughts. New mastic seals the gap.
For landlords and businesses
Housing providers, facilities teams and property managers book us too in Wymering and across Portsmouth. Several sites can go on one quote, and we are fully insured for the work.
We work for landlords and letting agents as well as homeowners. Resealing between tenancies is a simple way to keep a property in good order.
When it is not the sealant
New sealant can’t fix everything, and we will tell you before work begins. Sealant won’t put right:
- Cracked or broken glass
- Crumbling stone or brickwork round the window
- Sash cords, weights and draught-proofing of the sashes
Not sure which it is? You can ring 0345 464 0079 or drop us an email and we’ll tell you honestly.
What we seal
- Tenement windows
- Timber door frames
- Brick reveals
- Period & listed homes
- Stone surrounds
- Sash and case windows
Windows and doors in Wymering
Wymering is within about 1 mile of the coast, where wind-driven rain is a fact of life and, nearer the shore, so is salt air. That’s hard on the mastic around older windows and doors, especially on the side facing the sea. Historic houses like Warblington Castle (about 4.8 miles east) are a reminder that the area around Wymering has older buildings as well as new. In older buildings, older timber frames in brick or stone need a different approach from a modern uPVC window.
In the older streets around Church of St Peter and St Paul, replacement windows fitted into old openings often leave uneven gaps that need backing and a flexible joint. If you let a flat or house near Cosham station, older sash windows in a rental need their mastic kept sound to keep the weather out.
Wymering is about 3 miles north of Portsmouth, in Portsmouth. Jobs in Wymering get the same care as everywhere else we work: the old material taken out, joints prepared properly and a 12-month guarantee. Across Portsmouth, we cover 19 places, Wymering among them.
We cover every part of the PO6 and PO2 postcode area for sand mastic and the streets around it. You’ll find streets such as Dean Road, Deal Road and Park Lane. Wymering is on the A397, which makes it straightforward to reach with everything needed for sand mastic. Neighbouring places we cover for sand mastic include Cosham (1 mile south-east), Paulsgrove (1 mile west), Hilsea (1 mile south), Drayton (1 mile east) and Widley (1 mile north-east). Within a short drive, we also cover Portsmouth (3 miles south), Southsea (4 miles south), Milton (4 miles south), Landport (3 miles south), Baffins (3 miles south) and Portsea (4 miles south-west).
Landmarks near Wymering
Locally, jobs take us to homes and businesses close to Springfield School, UTC Portsmouth and Alexandra Park, among other places. There’s a railway station in Wymering itself: Cosham station. Nearby you will also find World War I Remembrance Centre (1.4 miles south-east) and Tricorn Centre (3.1 miles south). The countryside around Wymering includes Portsdown Hill and Southmoor Nature Reserve.
Why deal with it now?
New mastic over crumbling mastic will not hold. Raking out and preparing the joint gives it a sound base so the new mastic stays put. Homes in smaller places like Wymering can face more weather, and failed outside joints let damp into walls. Indoors, a failed seal lets water into floors and panels as it would anywhere.
The cost reflects the work involved, not guesswork. That is why we ask about the job first and give you a clear price before any work starts.
What you get with us
- An ARBOMaster approved applicator
- More than 20 years in sealant work
- 180+ five-star Google reviews
- Tidy, careful work
Take a look at our cost guide or customer reviews.
Questions from Wymering
Do you work for landlords with property near Cosham station?
Yes, we work for landlords and letting agents. You can ring 0345 464 0079 or email us with the address and a few details, and we will give you a fixed price before we start.
Does living near the coast affect sand mastic in Wymering?
Coastal weather is harder on outside sealant: there’s more wind-driven rain and, closer to the shore, salt in the air. Choosing the right sealant for the frame and wall, laid at the right depth, helps it last.
What’s sand mastic made of?
A traditional pointing material made from sand and a linseed-oil-based binder, used between timber frames and stone or brick.
What do you need from me for a quote?
The location, the problem and the rough size of the job. Photos by email help too.
Can you seal over the old sealant?
No, and we never do. It can look neat for a few weeks, but the new layer lifts away from the old one. Removing the old sealant completely is the only lasting way.
How long does sand mastic take to go off?
The surface skins quite quickly, then hardens over a longer period. Timing depends on the weather and the joint.
Is there any odour?
Some sealants have a smell while they cure, but it fades. Opening a window helps.
How long does the job take?
Most jobs take anything from a few hours to a full day, depending on how many windows, including the preparation. We will confirm how long when we quote.
How to look after the new joints
A little care helps the new joints last. Our advice:
- Keep modern sealant off the mastic
- Inspect the joints round the windows every year or so
- Renew mastic before redecorating the windows
- Don’t paint over the new mastic
Do not touch or press the mastic while it hardens. It forms a skin fairly soon but needs longer to fully harden.
Sound mastic protects the frame. Failed mastic lets water reach the timber, which can lead to rot.
How the visit works
On the day, we start by going over the job with you. Surfaces next to the work are protected before any work starts. The work usually takes anything from a few hours to a full day, depending on how many windows. In a smaller place like Wymering, parking is seldom the issue; lanes, gates and long drives are worth mentioning. For outside work, side access and the height of the joints help us plan.
- We look at the surrounds with you and agree the joints to renew.
- Old mastic and any loose material are raked out.
- We pack any deep voids first.
- The sand mastic is mixed and pressed into the joint by hand.
- The surface is finished to suit the stone or brick.
Before we arrive
- Keep children and pets away from the work area
- Tell us about access, such as stairs, a lift or high-level joints
- Tell us about any previous sealing or DIY attempts
Get a quote
We quote each job on its own. Simply ring 0345 464 0079 or send us an email and describe the job, and photos are welcome.