Protecting Foundation When Building Raised Beds Against House

Homeowner asks if plastic barrier is needed between soil and foundation for an 18-inch raised flower bed against the house.

Yes, Barrier Is Essential

Any soil contact bridging the damp-proof course risks moisture intrusion and damp problems. The damp course location varies—consult your builder to identify it and determine proper isolation method.

Proper Isolation Techniques

• Vertical waterproof membrane on foundation wall
• Drainage board or dimple mat against membrane
• Gravel backfill zone (6-12 inches) with French drain at base
• Maintain 6+ inch gap between soil and siding

Jonathan
www.ecologicagardens.com