10 Steps To Avoid Irregular Pool Plaster

The cause of irregular plaster hydration and streaking can be prevented with a little forward thinking.

1. Prepare the shell for plaster a few days in advance. Do not rely on the plaster crew to seal the shell on plaster day.

2. Chip out and repair every weeper and wet spot. Water flowing in, will be water flowing out.

3. Depressurize the pipes & remove ALL caps on the return lines and light conduits. Allow the water to completely drain out. Dripping water on fresh plaster will cause streaks.

4. Set the return fittings and seal around all of the penetrations with a cement material (non-shrink grout/hydraulic cement). Plaster is not waterproof (per National Plaster Council). Waterstop rings are highly suggested.

5. Using plaster to seal around penetrations can cause a visible halo effect, because of the excess thickness, white plaster patch or hydration variations.

6. Applying a bond coat to the entire shell will ensure the plaster hydrates evenly (yes, even new shells). The density of the concrete pool shell varies throughout, and so does it’s absorption of water. Bond coating will even everything out.

7. Fill the pool, starting from the deepest area first. Filling the spa first, may allow water to flow backwards through the plumbing and exit the pool lines. This will cause streaking on the walls.

8. An old gym sock taped on the end of the hose captures any sediment in the water and prevents the hose fitting from making any marks. This applies to plastic & brass fittings.

9. Do not use a water truck until there is a substantial pool of water in the basin. The cascading water flow can easily erode fresh plaster.

10. A pillowcase taped on the end of a large fill line can be used to capture sediment.

By following these simple steps, you can ensure you’ve done everything to guarantee an even finish appearance.

Swimming Pool Expert Witness