- Joined
- May 21, 2016
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My sewer lid has cracked and I need to fix it before I, or someone else, has a cold, smelly swim. But I can't work out how many bags of cement I need to make a new one. It's 1800 long, 1300 wide, and, 75 thick. Does any one know how to calculate the correct amount of cement for this? 0ne Bunnings store said 8 bags. Another said 20 bags. So they're no help either. Any advice appreciated. wiley.