Graphical Construction Glossary >> Roofs and roofing. >> Roof Framing >> timber purlin
Seldom seen in new work but there are many great historical roofs far grander that the sketch above that rely on timber under purlins.
In standard house roof framing under purlins are commonly placed at mid span of the rafters and propped or strutted off internal walls.
Before the introduction of cheap cold rolled roofing sections came on the market it was common to use a combination of steel beams and lumber purlins. In the above sketch the joints of the purlins is shown in two ways.
This hassle of short lengths of timber and joining them to the steelwork must have been the driving force for the development of lightweight engineered steel purlins.
There are a whole range of timber engineered laminated and hybrid steel and timber beams made that are very suitable for rafter support purlins provided that there is enough space available.
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