Building a Raised Bed Near a Garage: Drainage and Foundation Protection

Raised bed along garage side (wet yard). How far from wall? Will bed help or hurt moisture?

Option 1: Setback ≥5 ft

Prevents water accumulation at wall. Doesn't solve weeds at wall.

Option 2: Impermeable Apron Under Bed

• Plastic, clay, concrete, or concrete paver layer under bed soil.
• Slope away from garage.

Option 3: Foundation Drainage System

• Underdrain at footing + dimpled membrane (FIN drain) on wall → footing drain → outlet.

Bed Effect

Bed worsens moisture if no drainage. Clay soil swells → foundation cracks.

Termite Note

No organic mulch against buildings. Use rock or bare apron.