Voids between baseplate and grout may be discovered after grouting. These voids may be the result of obstructions, trapped air, or varying grout levels during placement.
There are basic steps to addressing these voids that are meant to ensure maximum contact between base and grout so unused forces are properly transferred to the foundation.
Step 1: Identify the Void
The most common method is sounding. Tap the plate and listen for hollow areas. Mark those areas to define the void.
Step 2: Determine Injection Holes
The hole needs to be near the center of the void or the part of a larger void to ensure travel to edges of void. Remember, tighter voids require the holes to be closer together than larger voids. Drill.
Step 3: Locate Holes for Air Relief
These holes need to be close to the edges of the void. They will allow for the air to escape, so the total area of these holes needs to exceed the area of the fill hole. Drill.
Step 4: Prepare Holes for Injection
There are three basic approaches to filling these voids:
Attach ports, tap holes, and insert pipe or fittings as required.
Step 5: Fill Void Area
Proceed with filling based on the method selected. Make sure you can visually see the air relief holes are full of epoxy.
Step 6: Remove Ports & Protect
Once you’ve filled the void, you can remove your port or filling system. You can unscrew stand pipes or fittings immediately; however, surface ports should stay in place until the epoxy sets.