Local Conditions
What Savannah Air Does to a Rug’s Foundation
Repair work does not arrive at random here. Savannah spends 230 days a year at or above 75% relative humidity — the level usually quoted as where mold can get started on wool and cotton given enough time — and the longest unbroken run in the five-year record is 67 days. For roughly 10 weeks at a stretch, the cotton foundation under the pile is never offered a chance to dry, and that single fact decides most of what comes through the door.
230
Days a year at or above 75% relative humidity
67
Longest unbroken damp run, in days
8
Nights a year at or below freezing
54.3
Inches of rain a year
A rug with no dry season
230 damp days a year is 62.9% of the calendar, and they do not arrive evenly spaced — the longest single run in the record is 67 days, against a mean relative humidity of 76.2%.
A rug does not care about the yearly figure; it responds to how long it is held above the threshold without relief, because mold is a function of time at humidity rather than of an average.
Wool will carry close to a third of its own weight in water before it feels wet, so by the time a Savannah rug feels damp the cotton foundation has been loaded for a long while.
What we see as a result is foundation work rather than cosmetic work: warps rebuilt before any pile goes back in.
Where the house puts the rug
Isle of Hope, Skidaway Island and Tybee Island sit on or near the water, which raises the local moisture load above what a regional figure implies.
Ground water close to the surface keeps the soil under a floor wet through the dry parts of the year, so the 135 days a year when the air is below the mold threshold do less recovering than they look like they should.
In Whitemarsh Island, Richmond Hill and Pooler the rugs are mostly on slab, which behaves nothing like a joisted floor.
A slab is in direct contact with ground moisture and, in older construction, often has no vapor barrier under it; a rug laid straight onto one is being wetted from below continuously rather than seasonally, and the cotton foundation is the part in contact with it.
The oldest housing on the collection route goes back to the 1870s, and construction of that age was not built to keep ground moisture out of the rooms above it — which is worth remembering before blaming a rug's condition on the rug.
What that actually sends in for repair
Foundation loss, not surface wear
Cellulose held damp loses strength, and 67 unbroken days above 75% is long enough for it to matter.
A foundation going that way gives no cosmetic warning, so the test is mechanical: fold a corner and see whether it flexes or crackles, and pull gently on a fringe tassel to see whether it is still anchored in anything.
Fringe, because fringe is the foundation
Fringe is the warp ends of the rug, not a trim, so 230 days a year of damp working on cotton warps shows up there before it shows up anywhere else.
Once the ends let go the rug starts unravelling from the edge inward, which is why a fringe that has begun to shed is worth dealing with while it is still a fringe job.
Dyes that moved before we saw the rug
162 days a year reach 80% relative humidity, where a wet rug stays wet, and an unstable dye that is kept wet and warm will travel.
Most of what looks like a stain on an old rug is dye that migrated during an earlier soaking, and it is corrected by hand where the fiber is still sound rather than by washing harder.
Figures above are from the ERA5 reanalysis record for the five years from 2021 through 2025,
taken at the center of the the Coastal Empire service area. If what you are seeing on your rug
matches any of this, send photographs and we will tell you which of these it is.