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Estimating AAC block is very similar to estimating CMU. The basic process would include getting the plans and then finding the walls the use the system you are calculating. First you will receive the plans once you have won the bid. Using the plans you will identify which walls are using the product you are installing. Calculate the total square footage of the walls, taking out the areas of door and window cut outs. Once you have the square footage of block you need mutliply it by the cost per square foot of block and that will give you the cost of block. You will also need to determine the amount and type of mortar you will need to use. Then using a table estimate the cost of mortar based off the square feet of block you need to lay. Once you figure that out you will add that to the material cost. For ACMU there is no equipment you need to buy other than trowels to lay the mortar. You may also want to add a cetain percentage to your cost based on calculated waste and also transportation cost of the material depending on where it is coming from.
Mortar Estimating Table
Estimating Labor
Once you have taken your material take off you will know the amount of block you need to lay. From this information you can determine the cost of labor. Using an RS Means book you can determine the the crew you will need for laying your block. Once you know your team you can determine there daily output. You would then divide the total number of square feet needed to be laid and divide it by the daily output giving you a total number of days you need the mason crew. You can then multiply that number of days by the daily cost of the crew to give you a labor cost for laying the block. We are assuming you do not need any training because the masons will already know how to lay the block because it is very similar to CMU. You may want to add a certain percentage to the cost for labor depending on conditions such as availibility of labor, site conditions, the weather, and so on.
Factors to Include
Avalibitity of Labor - Masons are a highly demaded laborer and sometimes they are hard to come by. If this is the case you may need to pay a premium to get the labor
Site Conditions - On your work site the Masons my be in conditions that may slow them down, such as tight areas to work in, the previous systems were not ready to recieve them, and not enough adequate area to store there material causing them many trips to get the material
Weather - This is always a problem because if it is raining or bad weather it will most likely slow down the Masons and there productivity during that day.
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