The Effect of Recycled Glass Cullet on Heat Transmittance in Shingles

Overview

Mountain Vista Governor’s School The purpose of this experiment was to determine whether the replacement of asphalt granules on shingles with recycled glass cullet would decrease the amount of heat transmittance through the shingle. The glass shingles were constructed by pressing crushed multicolored glass into the sticky tar of a shingle. Glass shingles with a white Titanium Dioxide coating were made using the previous glass shingles and dusting a thin layer of the powder onto it. These were used to test if a change from dark to light color on shingles would also affect the heat transmittance. Thirty shingles were made for each of the three trial groups and tested using a heat lamp and a thermometer probe that was placed under the shingles. The data exhibited significance through a p-value of less than 0.00001. The means of the trial groups differed by almost ten degrees Celsius between trials with asphalt shingles at 63.57°C, glass shingles at 52.73°C, and glass shingles with Titanium Dioxide at 42.75°C. Standard deviations remained under 4.5 degrees Celsius for the three groups. In conclusion, the significance between the asphalt and glass granule shingles was demonstrated in this experiment as well as the significance between plain multicolored glass shingles and glass shingles with a white Titanium Dioxide coating. This research could prove vital in sourcing green roofing to urban area to mitigate the Urban Heat Island effect and reduce energy used to cool houses in the warmer months.

Competition history

• JSHS 2020 Category not listed

Resources

• National JSHS abstract book ↗

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