Written by Chris Nolan on
Written by Chris Nolan on
People with flat roofs love rooftop decks, and why not? Oftentimes, it’s an otherwise wasted space. A rooftop deck can provide a whole new perspective for you. You can have a commanding view of your whole area. What a great viewpoint. Before you get started, though, there are many important things to consider. It’s best to do your homework first.
Before getting started, find out if a rooftop deck is allowed in your area. Do you have local zoning prohibiting a rooftop deck? Are there homeowner association restrictions in your area? Find out. If not, a great place to start is to check with your local building department. Building code officials are a wealth of information. They know the local building codes and can save you money in the long run.
Can your roof structure support the additional weight? A building code official may be able to help you here. Or not. At a minimum, they will likely know what the loading requirements are in your area. You may also need a master builder or structural engineer to determine the loading capacity of your roof. They can determine whether your existing roof can support the extra weight of a deck. Never build a rooftop deck without checking this first.
Architects, landscape architects, engineers, green roof professionals, master builders all have their specialties. You may want to interview several of them before deciding on your rooftop deck team. Green roof professionals often have many (or all) these resources in house. If not, they will likely consult with an architect or engineer first anyway. Ask them about their process. Find out how experienced they are. It’s well worth it.
You may already have some ideas on how to utilize your rooftop deck space. Are you going to have plantings? An overhead element like a pergola? Seating areas? Do you need access to drains or utilities? Professional designers can help you plan wisely for your unique space. Enlisting experienced professionals can save you years of grief and add many years of enjoyment. Your call.
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The basic options are sleepers, wood framing or adjustable pedestal systems.
Rooftop decks are possibly the most punishing area to build a deck. They’re low clearance (moisture can get trapped below), low ventilation and high exposure. They often see the sun all day long. Choosing the right decking to survive - and thrive - in this environment is an important decision.
Synthetic decking options range from wood composites, to plastic capped wood composites, to cellular PVC. Most are available in a variety of colors. Some may perform well in this harsh area. Most do not. Most of the synthetics heat up and expand and contract making them uncomfortable to walk on. If you are considering this option, please do your homework first.
Softwood decking is not a very good idea on a rooftop deck. Pressure treated decking is very likely to split, crack, warp and twist in this harsh environment. Even higher-quality softwood decking, like cedar, will require a lot of refinishing up at this height and exposure. If it's not refinished regularly, expect lots of splitting and checking.
High density hardwood decking species such as Ipe, Garapa and Machiche hardwoods are an excellent consideration in this environment. There are many high-performance hardwood decking species to choose from. They will work as well as the deck layout allows. For example, the more clearance you have below the deck (height from top of roof to bottom of deck boards), the better. The spacing between the deck boards is also critical. This is very likely the only place your deck will ventilate.
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