wvgca i ran my fascia before scenery gave me the opportunity to run the scenery right to the edge of the fascia, which i left maybe 3/8 inch higher than the layout
i ran my fascia before scenery gave me the opportunity to run the scenery right to the edge of the fascia, which i left maybe 3/8 inch higher than the layout
Likewise I have installed my fascia before the scenery. Knowing were rises in the terrain/landform above the rail head will be, I mostly start with having the top of my fascia 3'' above the rail head or flat land surface. The bottom of the fascia sections are in line. The top edge will then be cut wavy or not to become the top of the highest knowned terrain along the aisle/walkway giving me 3'' to nothing (were rails, parking lots and roads are close to the edge) in waste.
Sheet styrofoam/blue board will be layed in and shaved/hot wired down to the top of the fascia. I model a Northeastern railroad, not to much is flat except maybe rail yards and towns.The top of the fascia will be cut lower then the railhead as needed for lowland, hollows, gullys and waterways (variation in the contour like the Bear mentioned in his above post).
Where the right of way bores though the mountains (around the wall layout) then the fascia will go halfway up to the top of that mountain. I fill in scenery from the fascia up to the mountain top.The mountains are not too tall 18'' to 24'' above the rail head.