Start from how vulnerable this breed really is
Silkies are not simply small chickens; they are disadvantaged in ways that change the fencing brief completely. Their silk-like feathers lack the structure that sheds water and gives flight, so they cannot fly to a perch or a roof when something comes over the fence. The crest of feathers over the head narrows their view upward, which is precisely the direction a hawk comes from. They are also famously gentle and slow to scatter. A Silkie flock behind ordinary chicken fencing in an open yard is, in predator terms, a served meal.
The honest design goal for this breed is a completely enclosed run — top, sides, and ground line — small enough to build to a high standard rather than a large yard built to a low one.
Fine mesh on every face, including the roof
Use hardware cloth with small openings for the walls, and carry the same thinking overhead: a solid roof is best, both against hawks and climbing raccoons and because it keeps the run dry, which Silkies need more than other breeds. If part of the top is wire rather than solid, it must be the same fine, firmly fastened cloth, never lightweight netting a raccoon can tear or a hawk can punch through in a stoop.
At the ground, the apron of mesh laid flat outward applies as it does for any flock, and the small size of a Silkie run makes it cheap to do properly. Rats deserve a specific mention here: they burrow into runs, take chicks and eggs, and worry adult birds, and only the fine continuous mesh, including under door thresholds, keeps them out. Keep feed in sealed metal storage outside the run rather than giving rats a reason to test the wire every night.
Inside the run: low, dry, and easy to read
Arrange the interior for a bird that lives at ground level. Roosts and perches should be low and wide, since Silkies often prefer to huddle on the floor or a low platform and can injure themselves dropping from height. The coop floor and a good part of the run need to stay dry: a Silkie that gets soaked loses body heat fast, and permanently damp ground under a low-sitting bird breeds the kind of health trouble that shows up as a whole flock looking miserable. A roofed run on well-drained ground, with dry bedding in the coop, is a health measure as much as a predator one.
Because these birds are so often kept with chicks — Silkies are devoted broodies — remember that a chick can pass through mesh an adult cannot, and a snake or rat needs only that same small opening. The broody pen within the run wants the finest mesh of all.
A daily check suited to quiet birds
Silkies do not announce trouble loudly. A bird that has been grabbed and dropped, or one that is simply chilled and failing, may sit fluffed and still in a corner looking much like a resting Silkie. The daily routine therefore has to be a real look at each bird, not a glance across the run: everyone up and moving, crests dry, no one hiding under the coop. At dusk they are the easiest flock in the world to shut in, and the latch still matters — a raccoon that learns the coop door is its whole plan.
Any Silkie that is wounded, soaked and shivering, or suddenly off its feet should be brought to a veterinarian promptly; small, delicate birds go downhill quickly.
Putting that close daily check on one person's list in KinsLe Care Teams, marked done with a timestamp each day, suits a breed whose problems are quiet ones.