“Hi, my name is Greg Batista here to answer another question from the internet.

GasGuy123 asks: Why does propane or natural gas have that rotten egg smell?

The smell is added on purpose. Natural gas and propane are odorless by themselves, which makes leaks dangerous. To fix that, suppliers add a chemical called mercaptan, which smells like rotten eggs. The odor is strong enough that people can detect it at concentrations as low as one part per billion. This safety measure has prevented countless accidents by giving people an early warning of leaks. In Florida, gas utilities are required by law to odorize fuel before distribution. That stink may be unpleasant, but it’s one of the most important safety features in your home.

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Authoritative references: U.S. Department of Transportation – Pipeline and Hazardous Materials Safety Administration (PHMSA); American Gas Association safety publications.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.

“Hi, my name is Greg Batista here to answer another question from the internet.

WaterloggedWally asks: Why do contractors complain about Florida’s water table?

Because it complicates almost every excavation. Pools, basements, or foundations often hit groundwater after only a few feet of digging. Contractors must constantly pump water out to keep sites dry. The U.S. Geological Survey notes Florida has one of the highest average water tables in the continental U.S., especially in coastal counties. That means higher construction costs and fewer below-grade structures. It’s also why many Florida homes are built on slabs instead of basements — the environment simply won’t allow deep foundations without expensive solutions.

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Authoritative references: U.S. Geological Survey groundwater studies; Florida Building Code excavation requirements.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.

“Greg Batista here, your friendly neighborhood engineer to answer your questions.

jujukillswithch asks: I heard post-tension cables are dangerous — is that true?

Absolutely. Post-tension cables are bundles of steel tendons stretched under extreme force inside a slab. They allow us to build longer spans with less concrete. But the danger is the stored energy. A single cable can hold tens of thousands of pounds of tension. If accidentally cut, that energy is released in an instant, and the cable can whip through concrete or steel. OSHA has documented serious injuries and fatalities from improper handling of these systems. That’s why slabs containing post-tension cables carry big warning labels, and why building owners must be careful when contractors want to drill or core through a slab. Only trained professionals with the right equipment should ever touch these systems. In Florida condos, where post-tension is common, ignoring the warnings can literally be deadly.

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Authoritative references: Post-Tensioning Institute (PTI); OSHA construction safety guidelines.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.

“Hi, my name is Greg Batista here to answer another question from the internet.

EarlyBirdEd asks: Why do some Florida counties require inspections at 30 years instead of 40?

This change came after the Surfside collapse in 2021, which tragically killed 98 people. Lawmakers realized coastal buildings face harsher conditions, so waiting 40 years for the first major inspection was too risky. Miami-Dade and Broward now require inspections at 30 years if the building is within three miles of the coast. Salt air, humidity, and storms age buildings faster, and earlier inspections catch problems before they become catastrophic. It’s one of several reforms Florida passed to make condos safer and prevent another Surfside.

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Authoritative references: Miami-Dade County Ordinance 22-63; Broward County Building Safety Program; NIST Surfside investigation.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.

“Hi, my name is Greg Batista here to answer another question from the internet.

LegalLou asks: Why do engineers always sign and seal their reports?

The engineer’s seal is more than a stamp — it’s a legal declaration. In Florida, when a professional engineer signs and seals a report, they are certifying that the work was done under their supervision and meets state standards. It also makes them legally accountable for errors. Without a seal, a report has no standing with building departments. The Florida Board of Professional Engineers warns that misuse of the seal can result in fines up to $5,000 per violation and disciplinary action. So when you see an engineer’s seal, it’s not decoration — it’s their professional reputation and legal liability on the line.

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Authoritative references: Florida Statute Chapter 471; Florida Administrative Code Rule 61G15.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.

“Hi, my name is Greg Batista here to answer another question from the internet.

FireSafeFran asks: Why do stairwells have fans blowing during fire alarms?

That’s called stairwell pressurization. Fans push air into stairwells to create positive pressure, which keeps smoke from entering. Smoke is far deadlier than flames — the NFPA reports that smoke inhalation causes more than 50% of fire-related deaths. In tall buildings, stairwells can act like chimneys, pulling smoke upward, which makes evacuation dangerous. Pressurization systems give residents a clear escape path and firefighters a safe way in. In Florida, building codes require these systems in high-rises because time is everything during an emergency. While you may not notice them during normal operation, those fans could be the difference between life and death when alarms go off.

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Authoritative references: NFPA 92 – Smoke Control Systems; Florida Building Code life safety rules.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.