Plywood uses in construction: practical guide
Plywood is one of the most versatile materials in the construction sector. Its multilayer structure, mechanical strength and the option of phenolic or sanded finishes cover a wide variety of applications, from concrete formwork to technical floors and temporary structures. This guide reviews the most common uses of plywood on site and which product to choose in each case.
1. Concrete formwork (phenolic panels)
This is plywood's flagship application in construction. Phenolic F/F (film/film) panels allow pouring exposed concrete with smooth surfaces and reusing the panel 15 to 40 times depending on quality. Used for:
- Formwork of columns, beams and slabs.
- Retaining walls and floor slabs.
- Curved formwork (with 6.5 mm or 9 mm thickness).
- Horizontal formwork in civil engineering works.
Most common thicknesses: 15, 18 and 21 mm. Formats: 1250×2500 mm and 1525×3050 mm. Film weight: 120 g/m² for standard use, 220 g/m² for intensive reuse.
2. Roof, floor and wall sheathing
Structural plywood (alongside OSB) is a reference material for sheathing: layers that add rigidity to the structure and serve as a base for subsequent finishes. Used for:
- Base beneath tiles, metal sheeting or waterproof membranes on roofs.
- Technical floors and subfloors before laying wood or ceramic flooring.
- Wall reinforcement in lightweight and prefabricated constructions.
For outdoor use, panels with class 3 bonding (WBP phenolic) are recommended, resistant to moisture and freeze-thaw cycles.
3. Temporary and auxiliary structures
During construction, panels are used for multiple temporary structures:
- Shoring and bracing of structures.
- Temporary enclosures, site huts and fencing.
- Ramps, walkways and work platforms.
- Templates and moulds for setting out.
Here you want cost-effective but sturdy panels: 12-18 mm multilayer birch plywood or second-life phenolic film panels.
4. Permanent wooden structures
With the rise of sustainable construction, timber is being used again as a main structural material:
- Trusses and glulam beams.
- Self-supporting panels and SIP systems.
- Prefabricated roof and floor elements.
- Modular houses and garden office extensions.
They require panels with certified structural grade (CE + DoP) and class 3 bonding.
5. Interior finishes and technical joinery
- Decorative wall and ceiling cladding (sanded B/BB plywood).
- Stair treads and risers.
- Built-in furniture, service cabinets and removable false ceilings.
- Technical doors and custom joinery.
Which plywood to choose by application
| Application | Recommended product | Thickness |
|---|---|---|
| Horizontal formwork | F/F phenolic 120 g/m² | 18 mm |
| Vertical formwork / walls | F/F phenolic 220 g/m² | 18-21 mm |
| Roofs and floors | Multilayer birch class 3 | 12-18 mm |
| Auxiliary structures | Multilayer birch BB/CP | 15-18 mm |
| Interior finishes | Sanded birch B/BB | 6.5-12 mm |
Supply for builders and applicators
KEFI BOSQUE GROUP supplies construction companies, formwork specialists and joinery workshops across Spain from our Valencia warehouse. We hold 300+ m³ in stock of phenolic and sanded plywood, direct delivery to site, and special pricing for recurring orders.
Sales contact:
Inna: +34 690 288 718 (WhatsApp)
Anastasia: +34 654 073 786 (WhatsApp)
Email: sales@kefigroup.es