industrial project roof

Emmanuel, are these clerestory windows? Just trying to picture what this scenario is. Too bad you can't upload a sketch on here to show what is going on. Without seeing what is going on, i would say that you can;t use the prescriptive method to document clerestory windows that are located within the roof area. The reason being is that the prescriptive method is very limited and its only really meant for prescribed scenarios. The methodology is based on how much of the sky dome is accessible through an opening. That is why you use 2H or the 63 degree angle to establish the depth of your zone, it is also why with skylight you use 35 degree angles. Its all about access to the sky. Clerestories are great daylighting strategies which, depending on their orientation, can provide some great reflective and indirect light into a space. To say that your daylight zone is the area that is defined by drawing a line straight down from the glazing surface and then the depth would be what? If the clerestories are really high, you couldn;t use 2H because leading edge of the zone technically has no access to the sky dome and the prescriptive method can;t be used for reflective strategies. Drawing a angle from the head of the clerestory window using the 63 degree may result in a realistic daylight zone, but if the windows are really high, the angle would create an unrealistic zone. You can;t really use any of the steps in determining the daylight zone from skylights because the clerestory glazing is vertical, and not horizontal. Without being able to establish a zone, you can;t demonstrate the ratio. Without the ratio, you can;t document the method.

Your curbed skylights can be used in the prescriptive method. If this is already built, then just use measurements, otherwise simulation is the best way to go. If your just trying to earn the daylight credit without wanting to know performance then you could use the prescriptive method, minus the clerestories.

There is no height limit, but there are the other requirements that must be met as noted in the Reference Guide.