Polyurethane waterproofing is a seamless, UV-resistant, very elastic waterproofing membrane that is applied with liquid.
It creates a protective layer that resembles rubber when applied to the surface, preventing water from penetrating.
It is particularly well-known for its great flexibility (it can stretch up to 300% or more), which makes it appropriate for expanding and contracting surfaces.
2. Types of Waterproofing using Polyurethane
1. Single-component PU
- Ready to use
- Reacts with moisture in the air
- Simple to apply
- Mostly Utilised for Homes
2. Combination PU
- Consists of resin + hardener
- Mixed before application
- Higher strength and durability
- Used in commercial and industrial projects
3. Properties of polyurethane waterproofing
Form | Liquid coating (1-component or 2-component) |
Finish | Seamless, joint-free membrane |
Elasticity | Very high, good for cracks |
UV resistance | Excellent (ideal for open roofs) |
Chemical resistance | Good |
Durability | 8–12 years depending on grade |
Curing time | Fast (4–8 hours between coats) |
4. Areas of Utilisation
- Terraces and roofs
- Balconies
- Toilets and bathrooms
- Parking decks and podiums
- External basements
- Water tanks with food-grade PU
- Swimming pools with special PU systems
5. Method of Stage-by-Stage Application
1. Surface Readiness
- Thoroughly clean the surface.
- Get rid of any loose particles, oil, and dust.
- Fix honeycombs and fissures.
- Make sure the area is dry.
2. Application for Primer
- Apply PU-compatible primer
- enhance adhesion
- Let the primer cure for four to six hours
3. Use of PU Coating
- Use a roller, brush, or spray to apply the first coat.
- If necessary, use fibreglass mesh to reinforce joints and corners.
- After 6 to 24 hours, apply the second layer.
4. Curing
- It takes 24 to 48 hours to fully cure.
- Keep dry while curing.
6. Pros
- Seamless waterproof layer
- Highly flexible (bridges cracks up to 2 mm)
- UV resistant (especially aliphatic PU)
- Excellent adhesion to concrete, tiles, and metal
- Long service life (10–15 years)
- Suitable for complex shapes and details
7. Cons
- Costlier than cementitious and bituminous methods
- Requires skilled application
- Sensitive to moisture during application
- Not suitable for damp surfaces (unless moisture-tolerant PU is used)
8. Most Suitable For
- Flat roofs with movement
- Areas exposed to sunlight and rain
- Premium residential and commercial buildings
- Repair work is required where a seamless coating is needed.
Contact GK Home Construction
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Email : care@gkhomeconstruction.com
Call us at : +91 9538999535
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