 Being more expensive and labour-intensive to produce than thatch, their introduction has been explained by the fact that their fireproof quality would have given desired protection to the costly temples.As a side-effect, it has been assumed that the new stone and tile construction also ushered in the end of overhanging eaves in Greek architecture, as they made the need for an extended roof as rain protection for the mudbrick walls obsolete.Vaults and arches were not generally used, but begin to appear in tombs (in a "beehive" or cantilevered form such as used in Mycenaea) and occasionally, as an external feature, exedrae of voussoired construction from the 5th century BC.