discussion3.1. Data use and presentationThe study explores BTI effect on green-roof thermal perfor-mance. It could hint whether green-roof installation could serve asa sufficient substitute of BTI layers with cost-saving implications.The temperatures above (ambience), within (green-roof layers) andbelow (indoor) the roof are compared between two blocks andamongst three plots using control plot as baseline. In addition, dif-ferences in heat flux between roof and indoor space are compared.Instead of comparing graphs of the two blocks side-by-side,Block 2 (with BTI) data were subtracted from Block 1 (without BTI)to highlight inter-block differences which are depicted in graphs.Sunny days with high solar input and hence significant thermalimpacts were chosen with reference to local meteorological data.Data collected on sunny days with comparable weather conditionswere compared and found to be similar, which could be consideredas replications. Instead of averaging the data of similar sunny days, atypical summer-sunny day was chosen for the present study. Mainweather data on the sample days are given in Table 2. In the graphs,