External Wall & Facade Waterproofing
External wall seepage follows hairline cracks, failed sealant joints and worn paint. Rainwater driven by wind finds the weakest point and travels horizontally before showing up inside. We diagnose the actual ingress path before specifying the coating, then apply the system from boomlift, gondola or rope access depending on building height and access.
Common defects we treat
- Damp patches on internal walls during heavy rain
- Cracked external render along window heads and slab edges
- Failed sealant joints at curtain wall and precast joints
- Algae, chalking paint and efflorescence on external wall
- Wet ingress along parapet copings and aluminium flashing
Method on site
Facade diagnosis
Visual survey, water trace, and where appropriate a controlled hose test to confirm the leakage path. Joint condition, crack pattern and existing coating adhesion all recorded before scoping the works.
Access method selection
Boomlift, gondola or rope access selected based on building height, ground access and surrounding activity. Rope access detailing for higher levels and tight site conditions.
Substrate preparation
Pressure wash, removal of loose paint and friable render, cutting out of failed sealant joints, V-grooving and filling of structural cracks, priming where the data sheet requires.
Coating and joint resealing
Two-coat elastomeric system at the specified spread rate. Sealant joints replaced with backing rod and movement-tolerant sealant sized to the joint dimension and movement class.
Inspection and handover
Visual handover walk with the client, photo record at access level, and a maintenance note covering re-coating intervals and joint inspection.
Materials we use
- Elastomeric acrylic and PU weatherproof coatings
- Polyurethane and silicone sealants for movement joints
- Crack injection grouts (PU and epoxy) where structural cracks are involved
- Cementitious render and bonding primers for substrate repair
Deliverables to the client
- Facade condition report with annotated photos
- Access plan and risk assessment for the chosen method
- Coating specification and dry-film thickness record
- Joint replacement schedule with sealant grades