Internal Sealants
Sanitary and internal sealing, cut in clean and tooled once.
Now booking across Bristol & the South West
A perfect line,
Zenith Sealants are interior and exterior sealant specialists based in Bristol. Fixed prices, clean beads and a finish that still looks right years after we’ve finished. From domestic bathrooms to large development sites and full commercial envelopes, we cover it all.
- 15+
- Years on the tools
- £5m
- Public liability cover
- 60mi
- Radius from Bristol
- 48hr
- Typical quote turnaround
Internal sealantsRemedial resealingExternal weatherproofingMovement jointsFire-rated sealingAcoustic sealingCurtain wallingSanitary siliconeCladding jointsExpansion joints
What we do
Sealant work, inside
and out
From a single mouldy bath seal to the full external envelope of a distribution centre, the same standard of preparation and finish applies either way.
Remedial & Resealing
Failed, mouldy or split sealant stripped out and replaced.
External Weather Proofing
Sealing that keeps the weather where it belongs.
Movement & Expansion Joints
Joints sized and sealed to absorb real structural movement.
Fire Rated & Intumescent Sealing
Linear gap seals and penetrations sealed to tested detail.
Acoustic Sealing
Perimeter sealing that makes the tested performance real.
Why Zenith
Anyone can run a bead.
Few run it right.
Sealant is a small line item that causes a disproportionate number of callbacks. Most of what we're asked to fix wasn't a bad product. It was a rushed joint. We work the other way round.
01
Preparation, not patching
Failed sealant comes out completely. Joints are cleaned back to sound substrate, dried and primed where the system calls for it. We never bead over someone else's problem.
02
The right system for the joint
Acrylic, silicone, polyurethane or hybrid, chosen for the movement, the substrate and the exposure, not for whatever happens to be on the van.
03
Fixed prices, no drift
A written quotation broken down by area before anything starts. If the scope changes you'll know before the work happens, not on the final invoice.
04
We leave it clean
Cut in straight against a clean edge, nothing smeared on the surrounding finish, and the area swept before we leave. Site managers notice, and so do homeowners.
CSCS carded operatives
£5m public liability insurance
Works to BS 8000-16 & manufacturer specification
Fire-rated sealants applied to third-party tested detail
The standard
A bead is either right
or it isn’t.
There is no nearly.
How it works
Five steps, no surprises
The same sequence whether it's one bathroom or four hundred plots.
- STEP 01
Enquiry
Send drawings, a schedule or a few photos. We will tell you straight away whether it is a job for us and what it is likely to involve.
- STEP 02
Survey & quote
Site visit where it is needed, then a written fixed-price quotation broken down by area, with no provisional sums hiding in the total.
- STEP 03
Preparation
Old sealant removed in full, then joints cleaned, dried and primed. Preparation is where a bead's lifespan is decided.
- STEP 04
Application
The specified system applied at the correct depth-to-width ratio and tooled in a single pass, cut in straight against a clean edge.
- STEP 05
Sign-off
Walked with you before we leave. Photographs, product data sheets and certification issued for your O&M file where required.
Who we work for
Main contractors to homeowners
Different clients, different pressures, but the same trade done properly. We're as comfortable on a 400-plot development as we are in a single Clifton bathroom.
New Build Housing
Plot-by-plot sealant packages for developers and principal contractors, sequenced around your programme and snagged before handover.
DevelopersPlot packagesHandover snagging
Commercial Fit-Out
Offices, retail and hospitality fit-outs where the sealant line sits in plain sight and has to be right first time.
OfficesRetailShopfitting
Industrial & Warehouse
Large-format external envelope sealing, trafficked floor joints and cladding work on distribution and manufacturing units.
CladdingFloor jointsEnvelope
Healthcare & Education
Hygienic and fire-rated sealing in live, occupied environments, worked around teaching timetables and clinical use.
Fire-ratedHygienicOut of hours
Hotels & Leisure
Bedroom and bathroom refurbishment programmes delivered floor by floor, with rooms returned to service on schedule.
RefurbishmentWet areasPhased works
Private & Domestic
Kitchens, bathrooms and whole-house resealing for homeowners who want it done properly, not patched over.
KitchensBathroomsResealing
Where we work
Bristol based.
South West covered.
Bristol and the wider South West, typically within 60 miles, with national coverage for larger contracts.
Bristol
Bath
Weston-super-Mare
Gloucester & Cheltenham
Swindon
Taunton & Somerset
Cardiff & Newport
Exeter
Not on the list? We travel further for larger contracts, so ask us.
Common questions
Things people ask
Straight answers on products, timescales and what actually makes a seal last.
What is the difference between mastic, sealant and caulk?
In practice they describe the same trade. 'Caulk' usually means a paintable acrylic used internally on skirting and architrave; 'mastic' or 'sealant' generally means a flexible silicone, polyurethane or hybrid used where the joint has to move or keep water out. We select whichever system suits the joint, the substrate and the exposure.
How long should sealant last?
A correctly specified and correctly prepared external joint should give 15–25 years. Internal sanitary silicone in a well-ventilated bathroom typically gives 5–10. The overwhelming majority of early failures we are called out to are down to preparation or the wrong product, not the sealant itself.
Do you work in occupied buildings?
Regularly. Hotels, schools, hospitals and offices are often sealed in phases, out of hours or overnight so the building keeps running. Tell us the constraints and we will programme around them.
Can you remove the black mould around my bath?
Mould growing inside a silicone bead cannot be cleaned out because it is rooted in the sealant. The only lasting fix is full removal, thorough cleaning and drying of the substrate, then resealing with a fungicidal sanitary-grade silicone. We will also flag the ventilation or movement issue that caused it.
Do you price by the metre or by the day?
Both, depending on the job. Repeatable measured work such as plot packages, cladding runs and floor joints is usually priced per linear metre. Remedial, snagging and access-heavy work is generally day-rated. Either way you get a fixed written price before we start.
More questions answered on the about page.
Free, no-obligation quote
Tell us about the job
Drawings, a schedule, or a couple of photos on your phone, whatever you’ve got. We’ll come back with a straight answer and a fixed price.
Bristol and the wider South West, typically within 60 miles, with national coverage for larger contracts.