Architectural Flashing Supply
Start a Quote
Coastal climate and exposure detailing · Lesson 2 of 4

Coastal climate and exposure detailing: materials, standards and design constraints

Texas code editions from April 2026, what Exposure D does to wind pressure, what FEMA and IBHS say about fasteners, zinc and stainless, why metals in contact matter by the sea, and how warranty documents define coastal for themselves.

You will be able to: Identify the code editions, wind exposure terms, fastener and metal guidance, and warranty distances that govern coastal sheet-metal work, and say whose document each one is.

12 min · 12 slides · 8 questions

All lessons in this module
Slide 1 of 12

Texas code editions from April 2026

TDI says that starting April 1, 2026, WPI-1 applications must be certified under the 2024 editions of the International Residential Code (IRC) or International Building Code (IBC).

TDI says the designated catastrophe areas have not changed with the new codes.

Most designated areas now lie in the windborne debris region; the 2024 IRC and IBC set protection requirements.

Sources

Videos for this lesson

What this video shows: Background viewing, not specific to coastal salt spray: a presentation on stainless steel in architecture, including a building in a polluted coastal environment that was cleaned and restored, and the need for regular maintenance cleaning.

Video: Understanding & Preventing Corrosion of Architectural Metals | Catherine Houska Presentation by ncptt, on YouTube. Chosen from the video's published description.

Glossary

Exposure D
The ASCE 7 wind exposure category for flat, unobstructed area and water surfaces upwind. FRSA writes that it applies where that roughness extends at least 5,000 ft upwind, and that the design professional declares the project exposure.
Kz
The velocity pressure exposure coefficient in the ASCE 7-16 wind equation. Velocity pressure is proportional to it, which is why Exposure D raises pressure compared with Exposure C at the same wind speed.
G185
A hot-dip galvanized coating designation for 1.85 oz/ft2 of zinc counting both surfaces, with a minimum of 0.64 oz/ft2 on one side. TB 8 says doubling zinc thickness approximately doubles the protection period.
Type 316 stainless steel
A stainless grade that FEMA TB 8 says is more resistant to corrosion than Type 304 and should be used for stainless steel connectors in coastal applications.
Paint-only warranty
A warranty that covers the paint coating and not the metal under it. The PAC-CLAD 35 year sample form says PAC makes no warranty on the base metal, which is sold as is.