What type of mortar is typically specified for exterior masonry walls in Florida's coastal environment?
Correct Answer
C) Type S mortar
Type S mortar provides high tensile bond strength and durability, making it ideal for exterior walls in harsh coastal environments where wind and salt exposure are concerns.
Why This Is the Correct Answer
Type S mortar is the correct choice for Florida's coastal environment because it provides high tensile bond strength and excellent durability against harsh weather conditions. The coastal environment subjects masonry to salt spray, high winds, and moisture, which require a mortar with superior bonding properties. Type S mortar has a compressive strength of 1,800 psi and offers the best resistance to wind loads and salt exposure. Its high cement content makes it ideal for structural applications and exterior walls that must withstand Florida's challenging coastal conditions.
Why the Other Options Are Wrong
Option A: Type N mortar
Type K mortar is a low-strength mortar primarily used for repointing historic masonry and is not suitable for new construction or areas requiring structural integrity in harsh environments.
Option B: Type O mortar
Type O mortar has the lowest strength of the common mortar types with only 350 psi compressive strength, making it unsuitable for exterior walls exposed to Florida's coastal winds and salt spray.
Memory Technique
Use 'S for Sea' - Type S mortar for coastal/sea environments, or remember the strength order: S>N>O>K (Strong, Normal, Okay, Keep for historic only)
Reference Hint
Florida Building Code Chapter 21 - Masonry, or ACI 530 Building Code Requirements for Masonry Structures
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