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Swimming Pool Base and Vermiculite used for Inground Swimming Pool Floor |
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| The purpose of the swimming pool base is to provide a smooth surface for the swimming pool liner. A smooth surface is less abrasive on the pool liner and makes it easier to keep the swimming pool clean. |
| 1 | Sand is the most economical and works well in play swimming pools that do not have a steep slope. The amount needed will vary by pool size. The sand should be mason's quality and spread about 1"- 2" thick. However it does not provide a pool floor without foot prints and impressions. |
| 2 | The most common used swimming pool base throughout the years has been a mixture of sand and portland cement. Portland cement is available from your local hardware store and can be mixed with sand to form a hard floor. |
| 3 | Vermiculite can be purchased in 28lb vermiculite only bags that must be mixed with Portland cement or in 42lb bags that is already mixed with Portland cement. The pre-mix is also known as pool-crete. The Vermiculite & Portland is mixed with water using a paddle mixer or cement mixer. |
Additional mixing information is provided in the Inground Swimming Pool
Installation Manual.
| The actual amount of material needed will vary depending on the dig and thickness of the swimming pool base used. This table can be used as a guide. It is based on a 2" thick swimming pool base. The sand/portland mix is generally the best choice for most homeowners. The Portland/vermiculite or Pre-mix should be used for high water table areas and hard freeze areas. | |||||
| Pool size | Sand & Portalnd Mix sand tons /portland* |
Portalnd & Vermiculite Mix portland* /vermiculite |
Portalnd & Vermiculite Pre-Mix Bags |
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| 12x24 | 3 / 7 | 6 / 13 | 26 | ||
| 14x28 | 4 / 10 | 8 / 16 | 32 | ||
| 16x32 | 6 / 13 | 13 / 25 | 50 | ||
| 16x36 | 7 / 16 | 16 / 30 | 60 | ||
| 18x36 | 8 / 17 | 17 / 34 | 65 | ||
| 20x40 | 9 / 20 | 19 / 38 | 75 | ||
| 24x44 | 10 / 25 | 20 / 40 | 80 | ||
| 16x41x26 | 9 / 20 | 19 / 38 | 75 | ||
| 20x45x30 | 12 / 26 | 25 / 50 | 100 | ||
| - | - | Vermiculite bags |
Pre-mix bags |
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| *94 lb bag of Portland Cement - You can also add sand to the vermiculite
mix When using pre-mix or portland/vermiculite mix over mixing will reduce the coverage when applied to the swimming pool floor. |
| Click for swimming pool gallery | Click for swimming pool installation |
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