. Chat Online Premixed Mortar v Mixing it YourselfFine Homebuilding Feb 00 0000 · A bag of pre-blended costs 0.00. But you need 0 bags for every 0 bag of masonry cement so the same amount of mortar is going to cost about 00. Let s say on this job he ll need 00 bags of masonry cement versus 00 bags of pre-blend. The cost difference is 000 for the masonry cement and sand versus 000 for the pre-mixed. Chat Online 