Category: Finishes
Prepared by Eng. Ahmed Fathy, Projects Manager ·
Definition
Flexible polyurea sealant is an elastic material gunned into joints and cracks to keep out water and dust while letting the joint move.
Why it matters on a project
Joints are the weakest point of any roof or facade; a good sealant keeps water out for years if applied to a clean, prepared surface.
Measurement and pricing
Measured in linear metres, stating joint width and depth.
Common mistake
Applying sealant into a dirty or damp joint without a backer rod, so it debonds within months.
Frequently asked questions
What is a backer rod and why use it?
A foam filler inside the joint that sets sealant depth and stops it bonding to the joint base, so it can stretch freely.
How long does exterior joint sealant last?
It varies with product, application and exposure; inspect it periodically and replace it when it cracks or debonds.
Related terms
- Expansion jointA joint allowing the building to expand and contract thermally without cracking.
- WaterproofingLayers preventing water ingress into structural elements or spaces, such as bituminous membranes and cementitious coatings.
- GRC (glass-fibre reinforced concrete)A cement mix reinforced with alkali-resistant glass fibres, lightweight, used for facades and ornament.
- Aluminium composite cladding (ACP)Aluminium composite panels for facade cladding; a fire-rated core must be selected per the fire code.
Does your project need interior design and finishing drawings? Send the drawings or a short description and we reply within one working day.
Service detailsRequest a quote