A successful and long-lasting WPC decking installation relies as much on meticulous ground preparation as it does on the quality of the materials. At Zhensure, a leading Chinese factory specializing in high-performance WPC products for the global market, we believe that "the foundation is everything." This guide will walk you through the critical ground-level details you must consider to ensure your outdoor flooring project stands the test of time and nature.

01: Ground Leveling and Foundation

A level, firm, and well-draining base is non-negotiable for the longevity of your WPC flooring. The installation surface must be properly prepared based on the specific conditions of your site. For soft surfaces like sand, soil, or lawn, we recommend the following methods:

• Pour a Concrete Slab: Create a solid, level base by pouring a concrete foundation. Once cured, you can build a framework of joists on top for the decking installation.

• Use Appropriate Ground Screws: This modern method involves fixing ground screws at regular intervals into the earth. Metal joists are then attached to these screws to create a stable, elevated subframe.

• Perform Surface Hardening: Excavate the soil to a depth of about 15-16 inches (400 mm), depending on soil quality. Compact the soil, lay a waterproof membrane, and add a layer of gravel followed by concrete slabs or a fresh concrete pour. The joists are then installed over this hardened surface.

Beyond being level and firm, the base must have a slight drainage slope, typically between 2-5 degrees, to channel water away and maintain a dry environment underneath the deck.

02: The Critical Role of Joists

Joists are an indispensable component when installing outdoor WPC decking. Never install WPC boards directly on the ground; a raised joist system is mandatory for performance and durability.

• Joist Spacing: Proper joist spacing is crucial for optimal load-bearing capacity. For most Zhensure WPC decking boards, we recommend a joist spacing of 30-35cm (approx. 12-14 inches) to prevent sagging and ensure structural integrity.

• Function of Joists: The primary role of the joist system is to ensure ventilation and drainage. A sufficient air gap beneath the decking allows for efficient airflow, which quickly evaporates moisture and prevents problems like mold, mildew, and rot, thereby extending the life of your installation.

• Choosing Your Joists: You have several options for joist material, including traditional timber, dedicated WPC joists, or metal joists. The choice depends on your project's specific requirements, budget, and local climate conditions. Our team can help you select the best option for your project.

Conclusion

Investing time in proper ground preparation and joist framework installation will make your WPC decking project simpler and significantly extend its service life. A flawless installation is paramount to protecting your investment and ensuring the best possible outdoor living experience. By partnering with a reliable supplier like Zhensure and adhering to these strict installation standards, you can deliver outstanding results to your customers with confidence.