How many bags do I need for a 4x8slab and can I use the fast setting mix for that
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The number of bags required will depend on the thickness of the placement. If you are using common 2x4" lumber for forms, you will need 23-1/3 50-pound bags. We generally do not recommend Fast Stting Conccrete Mix for slab work, as it requires considerable skill to mix, place and finish before it sets in 20-40 minutes.
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