Table of Contents

Picture of Chris Breen

Chris Breen

Chris Breen, Principal Owner of Legacy Decks and Outdoor Living and has been serving families in Upstate South Carolina since 2005.

Share with

Under Deck Waterproofing Legacy Decks 1

What To Know About Under Deck Waterproofing

For most people, their deck is one of the most-used spaces on the property. It’s a place where families and friends can gather to enjoy the outdoors, soaking up the sun and enjoying the fresh air.

If you’re considering adding a second-story deck to your home, you may have thought about what you could do with the space below the deck. Should you turn it into extra storage space or, even better – an outdoor living space of its own?

Since the space below a second-story deck is protected from sunlight and heat, it is ideal for entertaining or relaxing outside during peak summer hours. But, without proper waterproofing, all that fun and relaxation can come to an end when the rain starts pouring down. That’s because water can leak beneath your decking and cause all sorts of problems.


What Is An Under Deck Waterproofing System?

A waterproofing system allows you to use the space below your deck without worrying about water damage or getting your feet wet.

Under deck waterproofing involves installing panels on the underside of your deck to collect and channel water away. This prevents water from seeping through the decking.


What Can You Do With The Space Under Your Deck?

It depends on the type of deck you have.

If your deck is elevated off the ground by a few feet, you can use the space below for storage. You can store your lawnmower and other garden tools in this area, as well as any seasonal items like holiday decorations.

If you have a second-story deck, you can turn the space below into an outdoor living space, complete with furniture, a grill, a fire pit, and anything else you might need to enjoy the outdoors.

You can have two decks – one that lets you enjoy the sunlight and one that protects you from the heat and rain! The perfect balance! The perfect backyard!


When Should You Waterproof Your Deck?

If you’re considering adding a second-story deck to your home, it’s best to waterproof it when you first build the deck. It is a smart move if you’re looking to make the most of your outdoor space.


The most important thing to remember about waterproofing a deck is that it needs to be done when you first build it. Once the deck is constructed, it becomes much more expensive to waterproof it.


How Much Does Waterproofing A Deck Cost? Is It Worth It?

The space below your second-story deck will become one of your family’s favorite places to hang out. It will be a comfortable, dry space for entertaining or relaxing, and it will add value to your home. But is it worth the cost?

When adding a new deck, waterproofing it can cost around $4,000 – $20,000, depending on the size and the job’s complexity. It is an investment that will pay for itself many times over by protecting anything that resides underneath. For example, if you add a deck below the second-story deck, it will stay in excellent condition for a very long time.



Waterproofing a deck is essential to make the most of your outdoor space. It will protect your space from water damage and allow you to use it for storage or as an outdoor living space.

When adding a second-story deck, under deck waterproofing is a no-brainer. The cost is worth it, and your family will enjoy the space for years to come.

If you are interested in adding a deck, request an estimate to get started today. We would love to help you make the most of your Greenville home!

Learn more about our under deck waterproofing services.