2. Light steel roof refers to the roof with steel roof truss (including portal steel frame, steel truss, bracket, etc.). ) and profiled steel roof, the steel content per unit area is below 30kg.
3. Unilateral cost is the cost per square meter or per cubic meter, which is a very important indicator of cost investment control. For professional cost personnel engaged in budget and final accounts, the accuracy of a budget can be quickly and preliminarily judged by analyzing the unilateral cost; For the relevant departments engaged in investment control and cost audit, the level of unilateral cost is the simplest and most direct indicator to measure whether a project investment is reasonable.