Isle of Wight · England
New Build Mastic in Blackgang
New-build sealant joints in Blackgang need attention? We remove the old material, prepare the joints and seal them properly.
- Frame joints opening as the plaster dries
- Second-fix sealing on new plots
- Leaking shower tray seals in a new home
How we handle new build mastic in Blackgang
We never seal over a failed new-build bead. New silicone will not bond to old silicone, so the joint is cut out, cleaned, dried and resealed. We work on show homes, skirting & floors and kitchens, and people most often call us about beads laid onto grit and dust from the build and second-fix sealing on new plots.
Work in a small place like Blackgang just needs the journey and access planning, and the work itself is the same as on any site.
We stand behind the work with a 12-month guarantee.
- Where
- Blackgang (PO38)
- Wider area
- Isle of Wight
- Cover
- One year on every job
- Price
- A clear quote up front
- Phone
- 0345 464 0079
- Page updated
- 26 October 2026
New build mastic around Blackgang
Blackgang is within about 1 mile of the coast. New homes near the sea put their outside mastic to work from day one, so it’s worth checking at snagging. 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.
Around Blackgang, as everywhere, new build mastic is only as good as the preparation behind it.
Blackgang is about 6 miles south-west of Shanklin, in the Isle of Wight. We provide new build mastic to homeowners, landlords and businesses in Blackgang and the surrounding area, as part of our work across the Isle of Wight. Blackgang is one of 125 towns and villages in the Isle of Wight where we work for new build mastic. Our Portsmouth page covers work nearby.
We work across the PO38 postcode area for new build mastic. Neighbouring places we cover for new build mastic include Chale (1 mile north-west), Niton (1 mile east), Puckaster (1 mile south-east), Pyle (1 mile north-west) and Bierley (1 mile north-east). Larger places within reach include Newport (8 miles north), Ryde (11 miles north-east), Cowes (12 miles north), Sandown (8 miles north-east), Shanklin (6 miles north-east) and Ventnor (4 miles east). If you are somewhere remote, the job takes a little more planning, so mention it when you ask for a quote.
Near you in Blackgang
Well-known places in the area include Blackgang Sawmill Museum (under half a mile west) and Whitecroft Hospital (5.7 miles north). Open spaces near Blackgang include Stenbury Down.
Landlords, agents and businesses in Blackgang
Landlords and letting agents in Blackgang can book us as well as householders. Sealant work between tenants keeps a property looking cared for before the next move-in.
We also work for businesses, from offices to washrooms and kitchens. On commercial sites, working times can be discussed when we quote.
Signs you need new build mastic in Blackgang
Not every new-build joint gets the right sealant: caulk where water collects, or a rigid product on a moving joint. Neither lasts long.
The problems people normally mention when they call include:
- Gaps opening as the house dries out and settles
- Beads laid onto grit and dust from the build
- Cracked sealant around new window and door frames
- Untidy sealant flagged on a snagging list
Whether the job is in Blackgang itself or nearby, the right material for each joint matters as much as a neat finish.
Comparing quotes
- How hidden problems are handled
- How the colour is chosen
- Whether VAT is included
- The length of the guarantee
Different surfaces, different methods
Kitchens
Worktops in new homes can move slightly as the house dries, opening gaps behind the upstand. A fresh flexible bead closes them.
Skirting and floors
New homes often develop a gap between skirting and floor. We seal it with a flexible sealant that copes with the movement.
What happens on the day
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 any work begins. The work generally takes anything from a few hours to several days, depending on the number of plots. Somewhere as small as Blackgang, access is often the only tricky part. For outside work, also let us know about exposed walls and any outbuildings involved.
- We look at why each joint failed, including any movement.
- We remove the failed sealant and clean the joints.
- We make sure the joints are dry and prime them if needed.
- Baths are filled with water, then the new sealant is applied.
- The finished joints are checked and the cure times given.
Getting ready for the visit
- For indoor joints, keep the area dry beforehand if you can
- Clear items away from the joints we are working on
- Mention if the joints have been sealed before
How to get a quote
Need a quote? Please call 0345 464 0079 or drop us an email with a few details. You’ll know what we plan to do, and what it will cost, before any work begins.
Read more
How we quote for new build mastic
We do not publish a price list, because jobs vary so much. What we look at:
- The type of sealant required
- Whether the work is at height
- How much old sealant there is and how hard it is to remove
- How much there is to do
The cost reflects the work involved, not guesswork. That’s why we ask a few questions first and agree the price before starting.
Asking for a quote
There’s no need for technical detail. Just tell us:
- A few pictures by email, if you can
- The problem you’ve noticed
- If it’s domestic, commercial or a hotel
- Any access issues, like height or stairs
If you’re in Blackgang and need new build mastic, ring 0345 464 0079 or send us an email. A short description of the job and where it is helps us quote, and we’ll agree the price before any work begins.
Can I do it myself?
Not every job suits DIY: high-level joints, fire-rated gaps, external movement joints and big jobs need the right product, the right access and the right method.
If you do try it yourself, take your time over the preparation: take out all the old sealant, make sure the joint is clean and dry, and give it the full cure time. If it does not work out, we can still put it right.
Other services in Blackgang
How to look after the new joints
Once the sealant has cured, a few habits help it last:
- Ventilate bathrooms well, especially in the first year
- Get a leaking seal dealt with right away
- Photograph failed sealant before it’s redone
- Don’t seal over failed sealant yourself
Watch the joints as the house settles. Small gaps can appear as the house dries and can be resealed later.
A failed seal in a new home lets water into joists, plasterboard and ceilings. Catching it early keeps the fix to the sealant.
Blackgang: your questions answered
Do you cover Blackgang for new build mastic?
Yes, Blackgang is within the area we cover. We work across London and the South East. Just call 0345 464 0079 or send us an email with a few details of the job, and we will give you a clear quote.
Is new build mastic in Blackgang guaranteed?
Every job comes with our 12-month guarantee, wherever it is. We are also fully insured and ARBOMaster approved.
Are you an approved applicator?
Yes. ARBOMaster is the approved applicator scheme for Arbo sealants, and we’re part of it.
Do you work for landlords and businesses?
Yes. As well as householders, we work for landlords, agents, businesses and hotels across the Isle of Wight.
Do you have insurance?
Yes. Mr Mastic is fully insured, and we’ve been doing sealant work for more than 20 years.
How do I get a quote for new build mastic in Blackgang?
It depends on the job, so we quote each one individually. To get one, call 0345 464 0079 or email us and tell us what needs doing and where.
Is it worth resealing while the house is still settling?
If the seal has failed and water is getting in, do it now. Hairline cosmetic gaps can wait until the house has settled.
Will you leave a mess?
No. The area is protected while we work and cleaned up afterwards.