Coastal and Floodplain Construction Inspector's Practice Exam

What is the required uplift for a roof to wall connection in a house with a rafter span of 36' and a deadload of 25 psi in a 100 mph wind zone?

1. 78 plf

2. 264 plf

3. 363

4. 464

The correct answer is: 78 plf

To determine the required uplift for a roof to wall connection, it’s important to consider the specific conditions such as the rafter span, dead load, and wind speed. In this scenario, a rafter span of 36 feet and a dead load of 25 pounds per square foot (psf) in a 100 mph wind zone are provided. The uplift forces can be calculated using the appropriate wind load data for the area, combined with the structural loads acting on the roof. For a house located in a 100 mph wind zone, the wind pressures can significantly influence uplift forces. Typically, the uplift force at the roof-to-wall connection can be derived from both the applied wind load and the dead load acting on the roof. The calculation for uplift in lumber structures often utilizes both the structural formula and tables provided in building codes or engineering references. These typically yield an uplift value in plf (pounds per linear foot) for various spans and dead loads. Given the provided dead load and conditions, the uplift calculated in the scenario aligns with the choice of 78 pounds per linear foot. This value is considerably lower than what would be expected if solely wind load factors were considered without accounting for the dead load resistance. Thus,