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Basic Thatch Cut Away Plan Always consult with the thatcher before implementing any of these designs they are deliberately vague as each roof must be treated as unique
With a basic design for covering the rafters with a fire resistant covering, vertical battens in line with the rafters and horizontal battens to provide air movement under the thatch Thatch roof plans in more detail
The weight of new thatch is approximately 7 Lbs per sq foot -14 Kg per sq metre *{Amended 10/06/11 with thanks to www.hastensconsulting.co.uk
7lbs per squ ft is probably a reasonable loading
but the conversion figure of 14 kg per square meter is not correct and
is significantly under weight.
The British Standard BS648:1964 'Weight of
building materials' provides a reed thatch loading figure of 8.5lbs per
sq ft (41.5kg/m2) for a 1ft thick thatch}*
U value of new thatch is approximately 0.034 W per 1 sq foot - 0.34 W per sq metre These figures can only be a rough guide, as the weight, density and air trapped in the material 'tube' in vegetable matter can vary as much as +/- 25% They are based on a 12" coat straight onto rafters, straw can be 18" thick and thatching over existing coats can be several feet in depth. Cut Away Section Photo's Thatching Specification |
