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Writer's pictureMaria Luisa Castellanos

Build a Durable Concrete Slab Roof for Your Miami Home by a Miami Residential Architect

Updated: Oct 10

Townhouse in Miami with concrete slab roof
Townhouse in Miami with concrete slab roof by United Architects, Inc.

Recent hurricanes


After seeing how two hurricanes have devastated west and central Florida, I, a residential architect in Miami, once again recommend a concrete slab roof and reinforced concrete block for your new property or addition.


Why do I recommend this?  It’s very simple.  Concrete and concrete blocks are very wind resistant.  With all the hurricanes Florida and the rest of the Southeast have been going through lately, it’s time these areas give up their traditional methods of construction – wood walls and roof structure.


Wood walls and trusses can be designed to withstand hurricane-force winds, but the connections need to be perfect. And this is the problem. If the workers of your general contractor were tired that day, or weren’t paying attention, then the connections may be imperfect.


Strength of concrete for a concrete slab roof in Miami


Concrete, on the other hand, is more forgiving.  Since it is poured as a liquid, when it hardens it is almost indestructible.  The way we build in South Florida is by putting a #5 steel bar every 2’-8” or so in a grouted cell.  This bar must go from the footing to the concrete tie beam above. (See drawing below) So, as you will see if you build this wall, it is very hard and almost immovable.

Now, let’s compare concrete walls and concrete roofs to wood.  Concrete can get wet.  Nothing will happen to it.  So even if you lose your roofing membrane in a storm, you may get a small leak into your house, but nothing like what will happen if you lose your roofing membrane and your shingles or tile roofing.  And, if your roof sheathing is damaged, as I saw often after Hurricane Andrew, it would literally rain in your house.

Drawing of concrete block section with concrete slab
Concrete block with concrete slab section showing #5 bar going from the footing to the tie-beam above

Downside of wood structures


Over time, you may have damage to your wood studs and your roof trusses.  Termites could eat them, or with any kind of water filtration, the wood could rot. 

So concrete and concrete blocks may cost a little more upfront, but it will give you back rich rewards over time.  Not to mention, you will be much safer during a hurricane.


Building concrete slab roofs

Not anyone can build a concrete slab roof or a concrete floor slab.  You need a professional team.  You will need an architect to design your house or addition, but you will also need a structural engineer to design the reinforcing for the concrete slab.  And the best floor slab is a floating slab.  In this drawing below, you see how the wall does not stop on top of the floor slab, but rather, bypasses it down to the footing.  With this kind of footing, it is much harder to get cracking in the floor slab because the slab “floats” and there is no pressure from the wall on it.

Wall section showing floating slab
Wall section showing floating slab
Contact information

So, if you are interested in building a different kind of house with a concrete slab roof anywhere in the southeast United States, but particularly, in Miami, and you want it built correctly, call me, Maria Luisa Castellanos, R.A., a Miami residential architect with offices in Coral Gables.  Call me on my cell phone, 305-439-7898 or email me at MLC@UnitedArchs.com

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Nov 26
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Building a durable concrete slab roof for your home offers long-lasting protection and excellent insulation. Concrete is known for its strength, energy efficiency, and ability to withstand extreme weather conditions. However, proper installation and maintenance are essential for longevity. Regular roof repair ensures the roof remains in optimal condition, preventing cracks or leaks that could compromise its integrity. Consulting roofing professionals can help ensure a concrete slab roof is built and maintained effectively, offering peace of mind for years to come.

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