The old Redeemer sanctuary and lower level fellowship hall were known to have regular water problems. A combination of 1940’s building methods and depreciation caused by the simple passage of time frequently caused Redeemer recurring water damage. Now, eighty years later, the new sanctuary will benefit from the knowledge and systems appropriate for our local water conditions.
First, the concrete reinforced foundation walls are waterproofed. This includes:
Second, a combination of hard PVC pipe and flexible plastic hose is installed around the footings, at the base of the walls, to collect the water that runs to the bottom of the foundation walls. This is covered with pea-size gravel and then fill dirt that is meticulously compacted in 12″ layers. Later, a complementary system will be installed on the interior of the foundation walls, below the lower level floor, to collect and channel water to the exterior of the foundation.
Third, the entire drainage systems, inside and outside the foundation, will connect to a new main feed that eventually connects to the city sewer line under Maple Road.
PVC pipe and flexible tubing is staged for use in the new drainage system.
A 10′ deep sump pump, large by residential standards, was installed in the lower level.
A water proof primer was first applied to the outside of the foundation walls.
After backfilling dirt, the same process will be repeated on the top half of the wall.
A peel-and-stick, water-proof board is installed on top of the primer.
Next comes a plastic honey-comb board which channels water away from the wall.
Then flexible plastic hose, wrapped in mesh, is laid around the exterior perimeter.
Small pea-size gravel is laid on top of the flexible hose and foundation footing.
Fill dirt is added on top of the gravel in 12″ layers with mechanical compaction.
A section view along the east wall shows all the layers of drainage.