What is a Purlin?

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A purlin is a horizontal timber within the roof space supporting the undersides of the rafters approximately midway. The purlins to each roof slope are usually supported in turn by diagonal timber struts which transfer the roof load down onto a load bearing internal partition. 


reallymoving comment:

Purlins are visible from the loft space of a property, therefore small loft hatches or limited lighting in the loft can often causing problems for the surveyors to gain access to the area. Problems can also be caused by items obstructing access or visibility of the purlins.

Purlins are usually checked by surveyors for deflection, bowing, or in some cases, whether there are any splits in the timber.

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Garrett O'Hanlon

MAP Chartered Surveyors

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