Figure 2-17. - Typical estimating work sheet.
The estimating work sheet shown in figure 2-17, when completed, shows the various individual activities for a project with a listing of the required material. Material scheduled for several activities or uses is normally shown in the Remarks section. The work sheet should also contain an activity description, the item number, the material description, the cost, the unit of issue, the waste factors, the total quantities, and the remarks. The estimating work sheets should be kept by the field supervisor during construction to ensure the use of the material as planned.
The material takeoff sheet (MTO) is shown in figure 2-18. In addition to containing some of the information on the estimating work sheet, the MTO also contains the suggested vendors or sources, supply status, and the required delivery date.
The bill of material (BM) sheet (fig. 2-19) is similar in content to the material takeoff sheet. However, the information is presented in a format suitable for data processing. Use this form for requests of supply status, issue, or location of material and for preparing purchase documents. When funding data is added, use these sheets for drawing against existing supply stocks.
Between procurement and final installation, construction material is subject to loss and waste. This loss may occur during shipping, handling, storage, or from the weather. Waste is inevitable where material is subject to cutting or final fitting before installation. Frequently, material, such as lumber, conduit, or pipe, has a standard issue length longer than required. More often than not, however, the excess is too short for use and ends up as waste. Waste and loss factors vary depending on the individual item and should be checked against the conversion and waste factors found in NAVFAC P-405.Continue Reading