Materials † water reed (Norfolk reed), wheat straw (Spring or
Winter), Winter being the most suitable. Wheat for thatch is often
known as wheat reed, long straw or Devon reed. Other thatches
include rye and oat straws, and sedge. Sedge is harvested every
fourth year to provide long growth, making it most suitable as a
ridging material.There are various patterns and styles of thatching, relating to the
skill of the thatcher and local traditions.Typical details †The material composition of thatch with its natural voids and
surface irregularities provides excellent insulation when dry and
compact. However, when worn with possible accumulation of moss
and rainwater, the U-value is less reliable. Thatch is also very
vulnerable to fire. Therefore in addition to imposing a premium,
insurers may require application of a surface fire retardant and a
fire insulant underlay.Roof Thatching