Mastic asphalt is heated to a temperature of  and is spread in layers to form an impervious barrier about  thick.
mˈæstɪk ˈæsfɔlt ɪz hˈiːɾᵻd tʊ ɐ tˈɛmpɹɪtʃɚɹ ʌv ænd ɪz spɹˈɛd ɪn lˈeɪɚz tə fˈɔːɹm ɐn ɪmpˈɜːviəs bˈæɹiɚɹ ɐbˌaʊt θˈɪk.