How would you prevent a 20x40 concrete swimming pool with tile finish from cracking after it has been drained and not refilled water for awhile?

Preventing cracks in a 20x40 concrete swimming pool with a tile finish after draining and leaving it empty for a while requires careful attention and measures to mitigate potential issues. Here's a step-by-step approach:

1. Thoroughly Clean the Pool:

- Ensure the pool is completely drained and allow it to dry thoroughly.

- Clean the surface, removing all dirt, debris, and algae to prevent excessive moisture retention and cracking.

2. Expansion Joint Maintenance:

- Inspect expansion joints around the pool's perimeter and between tiles.

- Ensure expansion joints are clear of any debris or sealant that may restrict movement.

3. Provide Support:

- Install water-filled bladders or sandbags inside the pool to support the pool walls and prevent hydrostatic pressure from causing cracking.

- Distribute support systems strategically to bear weight across the entire pool.

- Alternatively, consider using a swimming pool cover designed to withstand the weight of standing water.

4. Monitor Ground Movement:

- Observe any signs of ground movement, sinking, or settling around the pool area.

- If any changes occur, consult a professional to assess the foundation and provide appropriate recommendations.

5. Control Temperature Changes:

- Sudden changes in temperature can contribute to cracking. Try to maintain a moderate temperature range.

- If located in a region with extremely cold weather, cover the pool with an insulated tarp to reduce temperature fluctuations.

6. Proper Refilling:

- Once ready to refill the pool, avoid rapid filling as this can strain the pool's structure.

- Fill the pool slowly and gradually to allow for even water distribution and minimize stress on the pool's surface.

7. Professional Consultation:

- If the pool has any unique features or you have specific concerns, seek advice from a qualified pool builder or structural engineer.

- They can provide customized recommendations based on the pool's design and local environmental conditions.

By implementing these measures and monitoring the pool's condition regularly, you can help reduce the risk of cracking and extend the life of your concrete swimming pool.