In layman's terms, the usage loss of rock wool boards is related to the use location. For example, for roof use, its loss is low, while for wall use, its loss is high. Simply saying how much its loss is is not rigorous.
First, let's look at the use of roof rock wool. Usually, the rock wool used for roof thermal insulation is directly laid on the ground, which can achieve almost zero loss. Because the roof is usually a regular shape, and there are almost no objects blocking its laying, so there will be no special-shaped cutting. And if it is used for walls, then it is necessary to cut window openings, door openings and other places. Of course, if the cut materials meet the use of other positions, there will not be too much loss.
From this, we can know that the loss of rock wool boards does not have a fixed amount, but needs to be viewed according to the use location. Of course, if it is loading and unloading loss and transportation loss, there will be, but it can be ignored, because during the handling process, missing corners usually occur. When encountering this situation, just fill the missing corner place.
Of course, if you want to calculate the precise loss, you can first calculate the overall area, then calculate the area to be cut, and then divide the cut area by the overall area to equal its loss. Just like a 100 square meter wall, the area of window openings and door openings needed is 20 square meters, then its loss rate is 20 divided by 100 equals 0.2, that is 20%. Of course, now you cannot get the precise loss, because the rock wool boards cut from windows and doors can also be used for splicing under window sills or other places. From this, we can also get its loss rate through recalculation.
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