Understanding the Importance of Deck Underpinning

When building a deck, one of the most crucial decisions you'll make is what to put underneath it. The material you choose will not only affect the longevity and stability of your deck but also its appearance and functionality. Let's delve into the various options available and their pros and cons.

Before we explore the materials, it's essential to understand that the primary purpose of placing something underneath your deck is to create a barrier between the soil and the wood, preventing moisture and pests from damaging the structure.

Common Materials for Deck Footings

Deck footings are the base that supports your deck's structure. They are typically made from concrete, but other materials can also be used.

Concrete is the most common choice due to its durability and strength. However, it's not the only option. Let's explore some alternatives.

Concrete

Concrete is a popular choice for deck footings due to its strength and longevity. It's durable, resistant to rot and pests, and can withstand heavy loads. Concrete footings also provide a solid base, preventing your deck from shifting or settling over time.

However, concrete can be labor-intensive and expensive to install. It also requires proper curing to prevent cracking. Moreover, if not properly reinforced, concrete can crack or crumble under extreme weather conditions or heavy loads.

Pressure-Treated Lumber

Pressure-treated lumber is another common material used for deck footings. It's less expensive than concrete and easier to install. It's also resistant to rot and pests, making it a good choice for areas with high moisture or termite activity.

However, pressure-treated lumber is not as strong as concrete and can deteriorate over time, especially if not properly maintained. It's also more susceptible to movement due to soil expansion and contraction, which can lead to a wobbly deck.

Underlayment Options for Decking

Underlayment is the material placed directly underneath your deck boards. It serves several purposes, including protecting the wood from moisture, providing a smooth surface for the decking, and creating a barrier against pests.

Choosing the right underlayment is crucial for the longevity and performance of your deck.

Vinyl Underlayment

Vinyl underlayment is a popular choice due to its durability, ease of installation, and low cost. It's resistant to moisture, rot, and pests, making it an excellent barrier for your deck. Vinyl underlayment also provides a smooth surface for the decking, ensuring a level and even installation.

However, vinyl underlayment can become brittle in extreme heat and may not be suitable for decks exposed to direct sunlight for extended periods. It's also not as environmentally friendly as some other options.

Rubber Underlayment

Rubber underlayment is made from recycled tires, making it an eco-friendly option. It's durable, resistant to moisture, rot, and pests, and provides excellent insulation, making it comfortable to walk on even in cold weather.

However, rubber underlayment can be more expensive than other options and may not be as easy to install. It's also more susceptible to damage from sharp objects, so it may not be the best choice for decks with heavy foot traffic or sharp-edged furniture.

When choosing what to put underneath your deck, it's essential to consider factors such as your climate, the size and weight of your deck, your budget, and your environmental preferences. Always ensure that the materials you choose are compatible with local building codes and regulations.

Regular maintenance is also crucial for the longevity of your deck. Inspect your footings and underlayment regularly for signs of damage or deterioration, and address any issues promptly to prevent costly repairs or replacements.

In the end, the material you choose to put underneath your deck is a decision that will impact both the appearance and functionality of your outdoor space. Take your time, consider your options, and choose the materials that best suit your needs and preferences. With the right choices, your deck can be a beautiful and durable addition to your home for years to come.