External sealant
External Mastic & Silicone Sealant
External joints on the South Coast take salt air, wind-driven rain and constant expansion. The sealant, the joint width and the preparation all decide how long it lasts.
What the work involves
Movement joints in brickwork, blockwork and render are cleaned out, backed with the correct joint filler and sealed to the right depth-to-width ratio.
Cladding, panel and coping joints are sealed with products suited to the panel material and the exposure.
Failed or split external sealant is cut out completely rather than overbanded.
Problems this solves
- Split or shrunken joints letting water in
- Cracking where render meets a different material
- Sealant that has failed after a few coastal winters
- Open joints on a new build snag list
Typical applications
- Brickwork and blockwork movement joints
- Render, EWI and silicone-render junctions
- Cladding, panel and rainscreen joints
- Copings, sills, thresholds and parapets
- Balconies, canopies and external frames
Areas covered
Portsmouth and the surrounding South Coast, including Southsea, Fareham, Gosport, Havant, Waterlooville, plus Hampshire, West Sussex and East Sussex.
Recent work
Photographs from real projects
External · Portsmouth · Brickwork movement joint 
External · Fareham · Render to window frame
FAQs
Common questions
- Do you provide external mastic work?
- Yes — external movement joints, render junctions, cladding and frame perimeters are a large part of what we do.
- Can you work at height?
- Access is arranged to suit the job. Tell us the location and height and we will confirm what is needed when quoting.
Related services
Get a price
Send us a few photos for a quote
Photos of the joint, the room or the elevation are usually enough for us to price the work without visiting.
Or email info@gesealantsolutions.com.