
Trying to maximize shed size on a 9'5" × 5'5" gravel pad. Looking for resin sheds with a gable roof shedding water to the sides to minimize front/back margins. What are the minimum margins I should go for?
TL;DR: Gravel shed foundation on uneven ground has interior dimensions of 9'5"x5'5", filled with 5.5" of gravel. Back wall is a ~1ft tall retaining wall with drainage backfill behind it. There's also a fence 1' behind the back wall. Soil is clay loam with low permeability. Planning on getting a resin shed with a gable roof that sheds water to the sides. When looking at shed sizes, what are the minimum margins I should leave around each side of the shed?
I built a shed foundation before looking at specific sheds. I basically made the foundation as large as I could without getting too close to any trees, and not blocking any paths.
The exterior of the foundation is 10'x6' with 3.5" wide timbers, leaving inner gravel dimensions of 9'5" x 5'5". It is filled with 5.5" of #57 gravel. Here is a pic of it: https://imgur.com/a/omoU60q
The soil is mostly clay loam and has low permeability. The ground there is very unlevel. The grade slopes towards the foundation from behind it, and also slopes somewhat to the right.
The foundation has a 12.5" tall retaining wall at the back that protrudes 1-2" above grade where grade is the highest. There's ~5" thick drainage backfill behind it filled with #57 gravel. The fence is also ~1' from the back wall, which I'm hoping will help keep some dirt/mud away.
I am planning on getting a resin shed with a gable roof that sheds water towards the sides, so the front and back margins (the smaller dimension) don't handle as much roof runoff and can be smaller. Something that looks like this: https://imgur.com/a/0hdVbL3
Looking online for minimum gravel shed foundation margins, I'm seeing varying advice anywhere from 1-2ft margins on all sides to just a few inches. So I figured I'd ask for advice here.
If I'm trying to get the largest shed possible, what minimum margins would you recommend? Also, does a gable roof that sheds water to the sides actually allow me to leave smaller margins on the front and back?