BOAF Interpretations

Interpretations Request Input

Original Request

Request ID: 8495
Requested By: Paul Wilburn
Requester E-Mail: pwilburn@mulhernkulp.com
Code Version: 2021
Code: RESIDENT
Code Description:
Chapter:
Section: Table R803.2.2
Topic: Minimum Roof Sheathing Thickness
Question: In Table 803.2.2 where the required sheathing thickness changes between the designated wind speeds, at what wind speed which falls between the 2 designated wind speeds does this change? As an example for wind speed 140 mph exposure B the sheathing thickness is 7/16 and wind speed 150 exposure B the sheathing thickness is 15/32. What sheathing thickness is required between the 140 mph exposure B and 150 mph exposure B? Can it be 7/16 or does it have to be 15/32?
Comment: None

Existing Interpretations and/or Declaratory Statements Related to this request

Input Received:

Table R803.2.2 is a prescriptive table, and a registered design professional may calculate a different sheathing thickness considering all site conditions. If you are interpolating between wind speeds, a registered design professional should be consulted to determine the sheathing thickness's adequacy to resist the loads. If a registered design professional is not involved, and you are strictly using the table, the most stringent of the two thicknesses should be applied.

Joseph Belcher on 12/17/2020 at 4:43 PM

I agree and would refer to the allowances found in R301.1

Linda Patrick on 12/17/2020 at 8:34 PM

I agree

Thomas Allen on 12/28/2020 at 4:14 PM

I agree.

Samuel Greenberg on 01/25/2021 at 8:16 PM

Answer:

On 12/18/2020 at 4:17 PM

Commentary:

None.

Comments on Draft:

I agree.

Joseph Belcher on 12/18/2020 at 5:08 PM

Looks good

Linda Patrick on 12/18/2020 at 5:52 PM

I agree

Thomas Allen on 12/28/2020 at 4:26 PM

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