Coastal climate and exposure detailing: methods and worked application

An eight-step coastal exposure review, a worked example of three assumed sites tested against three documents, a worked wind exposure example, and how to choose fasteners, plan inspection and keep the evidence.

You will be able to: Run a documented coastal exposure review in eight steps, testing assumed sites against the documents that govern each product and recording assumptions, units and evidence.

The method in eight steps

Eight steps: locate the site; find the rules and code edition; take wind inputs from the designer; map exposure on the building; list each metal and its document; check each document's distance and exclusions; choose fasteners; plan maintenance and record the evidence. This is a course method, not a code procedure.

1: Locate: distance from the closest building feature to each shoreline type, wind direction, height
2: Rules: Texas area, inspection path and adopted code edition
3: Wind: risk category, speed and exposure come from the designer of record
4: Map: ocean-facing, rain-washed and sheltered surfaces; enclosed spaces
5: List: every metal, coating, fastener and clip with its maker, form and date
6: Check: each document's distance and its exclusions
7: Fasten: fastener and clip metals matched to the system and the maker
8: Record: inspection plan, photographs, data sheets and invoices

This course's eight-step method, not a code procedure.

Sources

NFIP Technical Bulletin 8: Corrosion Protection for Metal Connectors and Fasteners in Coastal Areas (June 2019) - FEMA
Technical Bulletin FH 2021-02: Updated FORTIFIED Corrosion Protection Requirements and Best Practices (first release 24 November 2021) - Insurance Institute for Business & Home Safety (IBHS)

Glossary

Closest feature (IBHS)

IBHS measures distance to the ocean or gulf coastline from the closest feature of the building.

Saltwater shoreline (IBHS)

For FORTIFIED designation, the mainland coastline including the Gulf of Mexico, and any bay or sound with no land barrier separating it from being completely open to the ocean or Gulf.

Partially sheltered exterior exposure

A TB 8 exposure class; its examples include areas under roof overhangs, decks and walkways. TB 8 says such surfaces can corrode faster than open ones.

Assumed input

A number used for practice or screening that is not measured on the project. This module labels every assumed distance and pressure as an assumption.