Before You Start: Critical Drainage Considerations

Proper drainage planning prevents water damage to your property foundation and ensures your patio remains stable for decades. Somerset’s clay soils and regular rainfall make drainage particularly crucial for successful installations.

Calculate the required fall before any excavation begins. Your patio needs a minimum gradient of 1:60 away from buildings, equating to approximately 17mm drop per metre of paving.

Questions to Ask Your Contractor

Before starting work, ensure your contractor can explain their process clearly. Ask about drainage solutions, base preparation methods, and material choices. Professional patio installation experts should provide detailed quotes and realistic timelines for completion.

• How will surface water be directed away from the property?
• What sub base drainage system will be installed?
• Are soakaways required for your specific soil conditions?
• How will existing drainage systems be protected during construction?
• What provision exists for French drains or linear drainage channels?

Somerset Soil Challenges

Heavy clay soils common across Somerset retain water and expand when saturated. This creates hydrostatic pressure beneath patios, potentially causing lifting or cracking without adequate drainage.

Professional soil assessment determines whether additional measures like geotextile membranes or enhanced sub base thickness are necessary for your location.

Surface Water Management Options

Linear drainage channels collect water efficiently along patio edges, particularly effective for larger installations or areas with limited natural fall.

Permeable paving materials allow water infiltration whilst maintaining structural integrity. Clay pavers offer excellent drainage properties, though clay subsoils may still require additional drainage infrastructure beneath the surface.

Traditional soakaways handle substantial water volumes but require adequate space and suitable ground conditions. Your contractor should test percolation rates before recommending this solution.