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Here's a detailed description of how I have been assigning f-factors: 1) In OpenStudio, create enough F-factor Ground Floor Constructions to assign the perimeter floor surfaces to. The best way to do this is create the first one and edit the f-factor field to what all the other ones should be, and put in a place holder for area and perimeter such as 1.0 to make it clear which ones have been edited later. Save and open the Sketchup plugin of the model.

2) Assign all the ground floor perimeter surfaces to the constructions created and change to boundary condition to GroundFCFactorMethod. I like going clockwise around the building so the numbering is easy to come back to later. Save and open the file in OpenStudio while keeping Sketchup open to do takeoffs in.

3) In Sketchup go through the surfaces with f-factors and open the group to click on the surface and get the area in Entity Info. Enter the area into OpenStudio for that construction. Do the same thing for the exposed perimeter of the surface. I do this by control clicking the perimeter lines and typing in the value from entity info into OpenStudio.

4) Repeat for all the F-factor constructions until all of them have been assigned to ground floor perimeter surfaces, have an f-factor value, a unique area, and a unique exposed perimeter.

5) Check that everything looks correct in the space tab under surfaces.

Here's a detailed description of how I have been assigning f-factors: f-factors:

1) In OpenStudio, create enough F-factor Ground Floor Constructions to assign the perimeter floor surfaces to. The best way to do this is create the first one and edit the f-factor field to what all the other ones should be, and put in a place holder for area and perimeter such as 1.0 to make it clear which ones have been edited later. Save and open the Sketchup plugin of the model.

2) Assign all the ground floor perimeter surfaces to the constructions created and change to boundary condition to GroundFCFactorMethod. I like going clockwise around the building so the numbering is easy to come back to later. Save and open the file in OpenStudio while keeping Sketchup open to do takeoffs in.

3) In Sketchup go through the surfaces with f-factors and open the group to click on the surface and get the area in Entity Info. Enter the area into OpenStudio for that construction. Do the same thing for the exposed perimeter of the surface. I do this by control clicking the perimeter lines and typing in the value from entity info into OpenStudio.

4) Repeat for all the F-factor constructions until all of them have been assigned to ground floor perimeter surfaces, have an f-factor value, a unique area, and a unique exposed perimeter.

5) Check that everything looks correct in the space tab under surfaces.