How Many Sandbags for a Patio Door?
How Many Sandbags for a Patio Door?
Sliding patio doors are a common flood-vulnerability point. Their bottom track sits low to grade, the seals are horizontal rollers that admit water fast, and the exterior is often on the shaded side of the house where the ground stays saturated. Sizing the barrier to your specific door width and expected water height is the key to getting protection right.
Quick answer for a patio door
The exact number of StormBag sandless sandbags you need to protect a patio door depends on the width of the opening and the expected water height. Here are the specific counts:
Standard 6-ft sliding patio door
| Expected water height | Bags needed | Recommended kit |
|---|---|---|
| 4" | 7 | 10-Pack Box ($99.99) or Double-Door Kit |
| 8" | 14 | 25-Pack Box ($239.99) or Double-Door Kit |
| 12" | 20 | 25-Pack Box ($239.99) or Double-Door Kit |
| 16" | 33 | Double-Door Kit ($109.99) × 2 or bulk order |
| 24" | 47 | Double-Door Kit ($109.99) × 2 or bulk order |
Extra-wide 8-ft patio/French door
| Expected water height | Bags needed | Recommended kit |
|---|---|---|
| 4" | 8 | 10-Pack Box ($99.99) or Single-Wide Garage Kit |
| 8" | 16 | 25-Pack Box ($239.99) or Single-Wide Garage Kit |
| 12" | 24 | 25-Pack Box ($239.99) or Single-Wide Garage Kit |
| 16" | 39 | Single-Wide Garage Kit ($149.99) × 2 or bulk order |
| 24" | 54 | Single-Wide Garage Kit ($149.99) × 2 or bulk order |
How the count is calculated
StormBag sandless sandbags measure roughly 14 inches wide and 4 inches thick when hydrated. The formula: (opening width in inches ÷ 14) × (water height in inches ÷ 4), rounded up, plus 10% overage for irregularities and a stability row on top for water heights above 12 inches. This is the same USACE-derived formula the StormBag Sandbag Calculator uses.
Deployment notes for a patio door
Patio doors are especially prone to leaking under the track before water even rises to the frame. Even 4-6 inches of standing water can push water through the track seal. Build the sandbag barrier at least 2-3 inches wider than the door frame on each side so water can't flank the barrier.
Get an exact count for your specific opening
The table above uses standard opening widths. If your opening is slightly different — a non-standard patio door, an oversized garage, a custom basement window — use the calculator to get the exact bag count for your measurements.
StormBag Sandbag Calculator
Enter your opening width and expected water height. Get the exact bag count and a kit recommendation.
Open the Calculator