Building Homes or Extensions/lean to

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Expert: - 10/27/2010


Question
hello there i am wishing to build a lean to, the length is  2.4 metres, the depth from the outside of my house to the end of the lean to is 2m 10. the height is 3 metres 10.if i need a 35 degree pitch, as i am wishing to put on slate tiles, how do i calculate the rafter length.

Answer
Dean,


Yor require a scientific engineers calculator to work this one out as I have.

Horizontal Distance (2.100mm ) vertical height of (1470mm )to aquire an angle of 34'59'31,27 equating to 35 degrees. Rafter length would therefore be 2.563mm. This is dead size and not allow for soffit extension or plumb cut for fascia unless you are adding sprockets to the rafter ends.Make sure you allow for the vertical height(1470mm) when building to wallplate level.
Hope this helps

Bill

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Questions on UK construction from Setting out Projects through to completion. Mainly concreting ,drainage ,bricklaying, masonry,carpentry and decorating,plaster work ,render/roughcasting.From new build construction to historical restoration, renovation. How to set out ,levelling and survey matters.

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Timeserved bricklayer , developing to Construction Site Manager and Educated to Site Engineer. Having been in the Industry for 35 years carrying out all types of general construction . renovation and historical renovation and remedial works.Now mainly on luxury dwellings to the value of £2M. Having been self employed and advising main Contractors and Developers through Construction phases and managing the works from concept to completion.Having a broad spectrum of experience.

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Scottish Apprenticeship in the crat of bricklaying. Scottish Construction Industry Site Managers Site Civil Engineering Construction and Surveying Set out. Scottish Civil Engineering Analysis of Concrete and Mortar Asbestos encountering. Scaffolding Inspectors Certification Planning, Programming and Management

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