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TRI High Wind Table 9B

Ask the Expert – How to use the High Wind Tables

The high wind tables in the TRI Concrete & Clay Roof Tile Installation Guide can be intimidating at first glance. A recent “Ask the Expert” response by TRI President and Technical Director Rick Olson describes how to use the tables to determine fastening requirements. Question – “Oklahoma is considering going to a 115mph wind zone in November of this year.

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Ask the Expert: “Do the (fastener) guidelines in Tables 1A and 1B apply to the underlayment”

We had several “Ask the Expert” questions regarding underlayment fastening recently. Below are 2 questions from an attorney and responses from TRI President and Technical Director Rick Olson. Question #1 – “Do the guidelines in Tables 1A and 1B regarding “Attachment Type of Fasteners” that call for ¾ penetration apply to the underlayment?” Response – Table 1A

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