Deck Tiles vs. Pavers for Outdoor Terraces

Understanding Deck Tiles: Materials and Assembly

Deck tiles are modular surfacing units, typically constructed from individual wood slats or other materials attached to a base. Lumber Plus offers hardwood deck tiles in species such as Ipe, Garapa, and Cumaru, known for their density and natural resistance properties. These tiles are available in standard sizes like 12" x 12" (1 square foot) and 24" x 24" (4 square feet), providing flexibility for various layouts. The modular nature of deck tiles often allows for easier installation and potential future removal for access to the substrate.

The assembly of deck tiles generally involves placing them directly on a prepared, level surface or utilizing a pedestal system. Pedestal systems elevate the tiles, creating a void underneath for drainage, concealing utilities, and accommodating slight surface irregularities. This elevation also promotes airflow, which can be beneficial for the longevity of hardwood. The specific support requirements depend on the chosen tile type and the underlying structure's capacity. For instance, a rooftop terrace over a waterproof membrane often benefits from a pedestal system to protect the membrane and facilitate drainage.

Understanding Pavers: Materials and Installation

Pavers, in the context of outdoor terraces, typically refer to solid units made from concrete, stone, or porcelain. Unlike deck tiles, pavers are generally denser and heavier. Their installation often involves a prepared sub-base, such as compacted gravel and sand, to provide a stable and level foundation. For elevated applications like rooftop terraces, specialized paver pedestal systems are also available, similar in function to those used for deck tiles but often designed to support heavier loads.

The installation process for pavers can be more labor-intensive due to their weight and the need for a precisely prepared base. Once installed, pavers create a robust and durable surface. However, individual pavers can be challenging to remove and re-install if access to the underlying structure is required for maintenance or repairs.

Structural Loading: Weight Considerations

One of the most critical distinctions between deck tiles and pavers is their weight, which directly impacts structural loading. Hardwood deck tiles, even dense species like Ipe, are generally lighter per square foot than most concrete or stone pavers. This difference is significant for elevated structures such as balconies, rooftops, or terraces built over existing structures with finite load-bearing capacities.

For example, a typical 24" x 24" Ipe deck tile, while substantial, will exert considerably less static load on a structure than a similarly sized concrete paver. When designing for a rooftop terrace, an engineer will calculate the total dead load (weight of the surfacing material itself) and live load (weight of people, furniture, snow, etc.). Choosing a lighter material like deck tiles can sometimes simplify structural requirements or allow for more design flexibility within an existing load limit. Always consult with a structural engineer to confirm the load-bearing capacity of your specific project site before selecting materials.

Support Systems and Drainage

Both deck tiles and pavers can be installed on various support systems, but the choice often depends on the application and desired functionality. For ground-level patios, deck tiles might be laid directly on a level, compacted gravel base, while pavers often require a more extensive sand or crushed stone bedding layer.

For elevated terraces, especially over waterproof membranes, pedestal systems are common for both. These systems allow for precise leveling, create a clear void for water drainage, and ensure ventilation. The pedestals themselves must be robust enough to support the chosen surfacing material and any anticipated live loads. When using a pedestal system, ensure compatibility between the tile or paver and the pedestal type, as not all systems are universal. The ability to remove individual modules for inspection or repair of the membrane underneath is a key advantage of both systems when properly specified.

Maintenance and Longevity

The maintenance requirements for deck tiles and pavers differ. Hardwood deck tiles, such as those made from Ipe or Cumaru, will naturally weather to a silver-gray patina if left untreated. To maintain their original color, periodic cleaning and application of a UV-protective oil are recommended. This typically involves cleaning with a mild detergent and water, allowing it to dry, and then applying the oil. The frequency of oiling depends on sun exposure and personal preference.

Pavers, depending on their material, may require different maintenance. Concrete pavers can be prone to staining and may benefit from sealing to resist moisture and prevent efflorescence. Stone pavers might need periodic cleaning to remove moss or mildew. Both types can accumulate dirt and debris in their joints, which may require occasional sweeping or pressure washing. The longevity of both deck tiles and pavers is generally high when properly installed and maintained, but the aesthetic changes and care routines are distinct.

Worked Example: A 100 Square Foot Rooftop Terrace

Let's consider a hypothetical 10-foot by 10-foot rooftop terrace (100 square feet) with a structural load limit that needs to be respected. The client desires a durable, attractive surface that allows for easy access to the underlying waterproof membrane for future inspections.

Option 1: Hardwood Deck Tiles (24" x 24" Ipe). Each Ipe deck tile covers 4 square feet. For a 100 sq ft area, this would require 25 tiles (100 sq ft / 4 sq ft per tile). Assuming a typical weight for a 24" x 24" Ipe tile, the total dead load from the tiles themselves would be relatively low, making it suitable for many rooftop applications. Installation would involve a pedestal system to elevate the tiles above the membrane, ensuring drainage and access. The relatively lighter weight of the tiles, combined with their modularity, makes them a strong candidate for this scenario.

Option 2: Concrete Pavers (24" x 24"). Using concrete pavers of the same dimension would also require 25 units. However, concrete pavers are significantly heavier than hardwood deck tiles. If the structural load limit is tight, the increased weight of the pavers might necessitate additional structural reinforcement, or the material might be deemed unsuitable. While a pedestal system could still be used, the total dead load would be much higher, potentially consuming a larger portion of the allowable structural capacity. This example highlights how material weight is a critical factor, especially for elevated projects.

Before you order

• Verify the structural load-bearing capacity of your project area with an engineer.
• Assess the existing substrate: Is it level? Does it require a pedestal system for drainage or access?
• Consider the desired aesthetic: Do you prefer the natural look of hardwood or the uniform appearance of pavers?
• Evaluate maintenance commitment: Are you prepared for periodic oiling of hardwood or sealing of concrete?
• Determine budget: Factor in material costs, installation labor, and any required support systems.
• Plan for future access: Will you need to remove portions of the surface to access the underlying structure or utilities?
• Review local building codes and regulations, especially for elevated or commercial projects.

Confirm installation details, approved uses and warranty terms in the current instructions for the exact product and profile. Your installer should verify the substrate, structure and applicable project requirements.

Questions to help you decide

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