A complete guide to water resistance, grades, and real construction performance
Shuttering plywood is widely used in construction for concrete formwork, but one common question builders ask is: Is shuttering ply waterproof? The answer depends on the plywood grade, surface film, glue quality, and how it is maintained on-site.
Is Shuttering Ply Fully Waterproof?
Shuttering plywood is water-resistant, not 100% waterproof. High-quality shuttering ply is manufactured using BWP (Boiling Water Proof) phenolic resin glue and coated with a phenolic film face, which protects the surface from water absorption.
This allows the plywood to withstand water exposure, wet concrete, rain, and moisture during multiple construction cycles.
Why Shuttering Ply Resists Water
- Phenolic Film Face: Prevents water penetration and concrete sticking
- BWP Grade Glue: Withstands boiling water and high moisture
- Hardwood Core: Provides dimensional stability in wet conditions
- Edge Sealing: Reduces water absorption from sides
How Many Times Can Waterproof Shuttering Ply Be Reused?
If properly maintained, good-quality shuttering ply can be reused:
- 15–20 times under normal site conditions
- 20–25 times with correct oiling and careful handling
Improper storage, no shuttering oil, or rough handling can reduce reuse life by up to 50%.
Is Shuttering Ply Suitable for Permanent Waterproof Use?
Shuttering plywood is designed for temporary construction use. While it resists water during formwork, it is not recommended for permanent outdoor or furniture applications. For permanent waterproof needs, marine plywood is a better option.
Final Verdict
Shuttering ply is highly water-resistant and performs excellently in wet construction environments when made with BWP glue and phenolic film. However, it should be maintained properly and used for its intended purpose to achieve maximum reuse and durability.