Calculating Quantity and Waste Factor

Calculating Quantity

Calculating the amount of natural thin stone veneer needed is relatively simple. For the flats which are sold by the square foot you would measure the length times the width of all the areas you wish to cover in stone. On something like a home exterior it is easiest to take a total measurement and then subtract the spaces taken up by the windows and doors.

The exterior corners are sold by the linear foot. On an exterior this would mean measuring from base to soffit for each corner you wish to cover. On an interior fireplace you would measure floor to ceiling. The corners are 90 degrees and are typically four inches on one side with an eight to ten inch return on the other. There are no interior corners, you take the flats to the edge.

After you have the final measurement you need to consider the waste factor for the cuts required to achieve your desired pattern. This is typically 10% over the actual amount needed.

Waste Factor

Working with natural stone veneer requires cutting, trimming, and sorting the individual components. Making those modifications will result in some of the material being unusable in the project. All of this unusable material is collectively called the waste factor. When starting to calculate the waste factor, you need to consider the type of joints installation. The smaller and tighter the joint, the more modifications are needed. Each time you modify a stone, you generate waste, thus more modifications equals more waste.

Suppose you have 4 walls that are 50 ft. x 10 ft. and have calculated a total square footage (4 walls x 50 x 10) of 2,000 sq.ft. After considering all the cuts around doors and windows and the tight joints in your design, you determine your waste factor will be 10%. That results in (2,000 x 10% = 200 sq. ft.) 200 sq. ft. of wasted material. Adding that to the total square footage results in needing to order 2,200 sq. ft. of material.