What EN 314 bond class should I specify for UK formwork plywood?
For exterior formwork exposed to weather, specify EN 314 Class 3 (WBP phenolic adhesive), which withstands prolonged boiling water exposure. Class 2 (melamine adhesive) is suitable for protected or short-term moisture exposure but may delaminate under sustained wet conditions on UK sites.
Does phenolic plywood need CE marking for use in UK construction?
Phenolic plywood used structurally in UK construction should carry CE marking under EN 13986, which confirms the product meets harmonised European standards for wood-based panels. Post-Brexit, UKCA marking may also apply depending on the project and local authority requirements.
What thickness of phenolic plywood is recommended for UK wall formwork?
For standard wall formwork in UK construction, 18 mm phenolic plywood is the most common choice. For higher concrete pressures or wider stud spacing, 21 mm panels provide additional stiffness. The choice depends on pour height, concrete slump, and the formwork system being used.
How does phenolic plywood compare to MDO for UK concrete forming?
Phenolic film-faced plywood offers higher reuse cycles (typically 15–30+) and a glossier concrete finish than MDO. MDO produces a matte finish with fewer reuses (8–15) but costs less upfront. Many UK contractors prefer phenolic for architectural concrete and MDO for utilitarian pours.
