Polyurethane (PU)
A family of resin systems used as liquid-applied waterproofing coatings, injection resins and sealants, ranging from rigid to highly elastomeric.
On an actual building
PU covers an unusually wide range of duties in waterproofing — a terrace coating, an injection resin that reacts with water, and a joint sealant can all be polyurethane chemistry with very different properties.
What we most often have to correct
That 'PU' on a quotation tells you what you are getting. It describes a chemical family, not a specification.
Terms that come up alongside this one
- Polyurea
A spray-applied elastomeric coating produced by reacting two components at high temperature and pressure.
- PU Grouting
Injection of polyurethane resin that reacts with the water it meets, expanding into a foam or flexible gel and sealing the leak path from within..
- Sealant Movement Capability
The percentage of a joint's width that a sealant can accommodate in extension and compression without failing, stated by the manufacturer..
Polyurethane (PU) — questions we get asked
What does polyurethane (pu) mean in waterproofing?
A family of resin systems used as liquid-applied waterproofing coatings, injection resins and sealants, ranging from rigid to highly elastomeric.
Why does polyurethane (pu) matter on a real project?
PU covers an unusually wide range of duties in waterproofing — a terrace coating, an injection resin that reacts with water, and a joint sealant can all be polyurethane chemistry with very different properties.
What do people commonly get wrong about polyurethane (pu)?
That 'PU' on a quotation tells you what you are getting. It describes a chemical family, not a specification.
Have a building showing this?
If a term on this page describes something you are looking at, a site inspection will tell you how far it has gone and what it needs. It costs nothing.
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