POSSUM KINGDOM LAKE, TEXAS
Below-Grade Waterproofing for a Custom Lakefront Home
Spaans Infrastructure Systems installed a complete below-grade waterproofing and drainage assembly across approximately 3,800 square feet of retaining and foundation walls.
Project Type
Custom Residential
Scope
Below-Grade Waterproofing
Size
Approximately 3,800 SF
Location
Possum Kingdom Lake, TX
System: Tremco 250GC waterproofing membrane, 20-mil HDPE root barrier and TREMDrain S drainage mat
Project Overview
This custom lakefront residence incorporates extensive below-grade retaining and foundation walls. These walls required a continuous waterproofing and drainage system before the surrounding areas could be backfilled and completed.
Spaans Infrastructure Systems was contracted to prepare the wall surfaces, install the fluid-applied waterproofing membrane, detail transitions and penetrations, and complete the exterior protection and drainage assembly.
The work was coordinated in phases to accommodate the construction schedule and provide a continuous system across approximately 3,800 square feet.
The Challenge
Below-grade walls are exposed to sustained moisture, soil pressure and difficult-to-access conditions after construction is complete. Any gaps, weak transitions or damage during backfill can create costly leaks that are difficult to repair later.
This project required:
Careful preparation of concrete and adjacent surfaces
Detailed treatment of transitions, corners and penetrations
Coordination across multiple phases of construction
Protection of the membrane before backfill
A drainage path to relieve water pressure against the walls
Waterproofing Installation
The assembly was installed in layers, with each component performing a specific role in controlling water, protecting the membrane and directing moisture away from the structure.
Fluid-Applied Membrane
Tremco 250GC was installed in two coats to form an approximately 120-mil fluid-applied waterproofing membrane. The seamless system conforms to the concrete surface and creates the primary barrier against water intrusion.
Surface Preparation
The concrete walls were pressure-washed, cleaned and inspected before membrane installation. Proper preparation promotes consistent adhesion and allows surface irregularities, transitions and repair areas to be addressed before the system is covered.
Protection and Drainage Assembly
After the membrane was completed, the walls received a 20-mil HDPE root barrier and 1/4-inch TREMDrain S drainage mat. The exterior components shield the waterproofing during backfill and provide a drainage path for water along the foundation walls.
Detailing and Transitions
Corners, changes in plane, penetrations and system transitions received focused detailing to maintain continuity throughout the installation.
A Complete Below-Grade Assembly
The completed installation combines a seamless waterproofing membrane with exterior protection and drainage components designed to manage water before it reaches the structure.
The system provides:
Continuous below-grade waterproofing
Protection against damage during backfill
Drainage along the exterior wall
Root-barrier protection
Detailed integration at transitions and adjacent construction
Project Result
Approximately 3,800 square feet of below-grade walls received a complete waterproofing, protection and drainage assembly.
Spaans Infrastructure Systems completed the primary waterproofing installation in coordination with the home’s phased construction schedule. The finished walls were protected with the complete membrane, root-barrier and drainage assembly before backfill and subsequent construction.
The project demonstrates our ability to deliver commercial-grade waterproofing systems on complex custom residential and structural applications.
Scope performed: Surface preparation, fluid-applied waterproofing, transition detailing, HDPE protection/root barrier and drainage-mat installation.
Have a Below-Grade Waterproofing Project?
Spaans Infrastructure Systems provides waterproofing, concrete repair and building-envelope solutions throughout Dallas–Fort Worth, North Texas and surrounding areas.