Who has a thatched roof on his house sometimes very long search for a chimney sweep. Not everyone sweeps chimneys on thatched roofs. That has to do inter alia with how thatched roofs can be entered, with a cane seat. Also in the modern screw roofs such a reed chair can be used.
Thatched roofs need extra protection. Therefore, inserting a so-called spark arrester at the outlet of the flue which, the name says it all, stop flying sparks. The recommended mesh size is a minimum of 9.5 mm and a maximum of 12.5 mm. As a rule, stainless steel wire mesh is used with a mesh size of 8 mm steel and 1 mm thick.