How many 80 pound bags of mortar do I need to lay 1000 8X16 block?

To determine how many 80-pound bags of mortar you'll need for 1,000 8x16 blocks, you'll first need to calculate the total number of joints. Typically, a standard block wall will require about 0.25 cubic feet of mortar per block. For 1,000 blocks, this equates to approximately 250 cubic feet of mortar. Since an 80-pound bag of mortar covers about 0.6 cubic feet, you'll need roughly 417 bags of mortar (250 ÷ 0.6 = 416.67).