Step-by-Step Guide to Installing Pavers on Rooftop Decks
Rooftop decks are becoming more and more popular, as they add both usable outdoor space in built-up areas, as well as value to a property. Creating a functional rooftop deck that actually looks good requires some planning, and one of the biggest choices is the type of flooring system.
Pavers are a top choice as they come in a wide variety of options, but are also fairly straightforward to install and maintain. In this guide, we talk you through the process of installing pavers on a rooftop deck, so that you can achieve a professional-quality finish, whether you're working with a contractor or taking on the project yourself.
Why Choose Pavers for Rooftop Decks
Before we start talking about installation, it's useful to have an understanding of why pavers are such a strong option for rooftop applications. Pavers provide a walking surface that is both solid and level, while still allowing water to drain below.
They can be removed and replaced individually if they get damaged, which makes them especially good for long-term use and upkeep. Pavers are also available in a wide range of materials such as concrete, porcelain, stone, and even wood-look finishes. This gives you a lot of potential to customize the look of your rooftop retreat.
What's also great is that pavers are designed to evenly distribute weight across their surface. Rooftops are engineered to handle specified loads, and a properly designed pedestal and paver system ensures safety by reducing the amount of stress that's put on the underlying structure.
Planning and Preparation
A successful installation of pavers begins with the planning phase. You should start by checking the structural capacity of your rooftop. We recommend that you speak with an engineer to confirm that your roof is able to handle the combined weight of pavers, pedestal supports, furniture, and of course, people.
You must be within certain limits in order to be compliant with building codes that apply to you.
Next, you should review your waterproofing system. Rooftop decks typically rely on a membrane that prevents water from penetrating the roof. This membrane must be intact before installation begins, as any leaks could cause long-term damage to the building.
The last major thing to do is map out the design on your rooftop. Try to think about how you want the space to be used. For example, do you want separate zones for lounging and dining? Do you plan to include planters or railing, and if so, where are these things going to go? Having a clear plan helps to determine where the pavers will be placed and where cut pieces may be required.
Materials and Tools
For this installation, the core component is the Outdoor Floor System® pedestal and support grid system, paired with your choice of pavers. This system creates a stable, elevated surface that allows for proper drainage and easy access beneath the deck if utilities ever need servicing.
Other materials that you may need include edge restraints or perimeter containment, and spacers (if not already integrated into the pedestal system).
The tools that are usually required are a tape measure, chalk line, rubber mallet, level, a saw with a diamond blade for cutting pavers, and protective gear such as gloves and safety glasses.
Step One: Preparing the Surface
The first task is to clean the roof surface thoroughly. You should remove any dirt and debris that could interfere with the pedestal system. While doing this, inspect the waterproofing membrane for any damage, and repair any weak areas that you find. Having a clean and secure base is very important if you want to have long-lasting results.
If the roof is designed with a slope to encourage water drainage, do not attempt to flatten it directly with filler material. Instead, rely on the adjustable pedestals to compensate for the slope when you are leveling your pavers.
Step Two: Setting Up Pedestal Supports
Pedestal supports form the foundation of the entire system. You should begin by laying them out in a grid pattern according to the size of your pavers. For example, if you are using 24-inch by 24-inch pavers, place pedestals every 24 inches in both directions.
Start in one corner of the roof and work outward. As you go along, adjust the pedestal heights so the tops are level with each other, compensating for any slope in the roof. Many pedestal systems include built-in spacers that automatically create consistent gaps between pavers, which helps with drainage but also the overall aesthetics.
Step Three: Placing the Pavers
Once the grid of pedestals is in place, begin laying the pavers. Carefully set each paver onto the pedestals and make sure that it rests evenly on all four corners. Check with a level as you go so that you know you are being accurate. It's easier to adjust a paver as it's being placed, rather than when the whole flooring system is down. Work in rows and avoid leaving any large open areas where pedestals are exposed.
When you are handling the pavers, be careful and avoid cracking or chipping them. If you do need to adjust them, use a rubber mallet to tap the paver gently into place. It's also a good idea to step back every now and then to review your progress. Sometimes it's hard to spot misaligned patterns until you look at the flooring as a whole.
Step Four: Cutting and Fitting Edge Pieces
Rooftop decks rarely measure out to perfect dimensions that match the size of the pavers. This means that at the edges, you will more than likely need to cut some of the pavers to fit. You should use a saw with a diamond blade, and always wear protective gear when cutting.
Measure very carefully before making any cuts, leaving space for expansion and contraction. Cut pieces should be positioned along the perimeter, where they will be contained by edge restraints. Take your time, as proper cutting and fitting give the deck a clean, finished look.
Step Five: Securing the Perimeter
Edge containment is an important step as it prevents the pavers from shifting over time. Depending on the system, you may use perimeter clips, restraints anchored into parapet walls, or raised edging elements. The goal is to ensure that the field of pavers remains locked in place.
Perimeter details may be important to you aesthetically. A neat edge makes the deck look more professional and intentional, while also protecting the integrity of the installation. The Outdoor Floor System® includes solutions for perimeter containment that lock the field of pavers securely in place, even in areas exposed to high winds.
Step Six: Final Checks and Finishing Touches
Once all pavers have been laid and the edges are secured, you should walk across the deck to check for stability. There should be no rocking or movement, so if a paver feels loose, adjust the pedestal heights until it sits firmly.
This is also the time to review the alignment of the pavers. Rows should appear straight, and spacing should be consistent across the deck. Small adjustments now will have a big impact on the overall appearance.
After the pavers are secure, you can add finishing touches such as outdoor furniture, planters, or railings. Lighting can also be added to give you some ambience at night.
Maintenance Tips
A rooftop paver system is already a relatively low-maintenance option, but it still requires some attention every now and then to keep it looking its best. Sweep the surface regularly to remove debris that could clog the drainage gaps. You can wash pavers with a mild detergent and water to maintain their appearance, especially in areas with pollution or airborne dust.
Every year, we recommend inspecting the pedestal system to check its stability in particular. If you notice any shifting, you can adjust the pedestals as needed. Since pavers can be lifted individually, repairs are straightforward. If your utilities run beneath the deck, access is as simple as removing one or two pavers.
Safety Considerations
It seems obvious, but it's always worth pointing out again - you must prioritize safety when you are working on rooftops.
Local regulations may require you to use fall protection systems, but we recommend that everybody does regardless. Heavy lifting is often involved in the paver installation process, so take precautions to avoid injury. If at any point you feel uncertain about structural issues, cutting techniques, or edge containment, consult a professional installer.
Conclusion
Installing pavers on a rooftop deck with the Outdoor Floor System® can help you to change an otherwise unused area into a versatile outdoor living space. The process does require some planning and the right materials, but with proper installation, you can end up with a flooring system that lasts for decades.
Regardless of your intention, from those looking to create a personal retreat to those who want to add value to a building, having an understanding of the paver installation process will help you to get results that are functional and look great, too.
