Before building a deck directly on the ground, there are several important points to consider:

• Choose wood species that are moisture-resistant, such as cedar, larch, or pressure-treated wood.
• Ensure proper ventilation by leaving a minimal gap between the ground and the deck, allowing air to circulate and preventing moisture buildup.
• Installing a drainage system beneath the deck can help divert water away from the structure. The use of sand and gravel can also minimize moisture.
• Avoid placing wood directly on the ground by using support stones or blocks to keep the structure as dry as possible.
• Construct the deck with a slight slope and ensure it is properly oriented to facilitate water drainage.
• Use a good-quality sealant to protect the wood from moisture. Apply this product every 1 to 3 years, depending on weather conditions and the specific product used.
• Apply a high-quality finish containing UV protection to extend the lifespan of the wood. Consider applying the finish before installing the wood beneath the deck. Emulsified oils such as Pareo Zero and Pro-Tek-Tor DR are recommended as they have better adhesion for this type of construction.
• Regularly clean the deck to remove debris that can retain moisture. Also, inspect the wood regularly for any signs of damage or rot.

It is always recommended to consult a professional before starting a project of this magnitude, as each situation may present specific challenges. They can provide personalized advice based on your specific situation and local conditions.