underpurlin
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underpurlin
HB50
horizontal structural timber member laid underneath rafters, and supporting them at mid-span or intermediate points along their length
See Figure A.19; Figure A.20
See Figure A.19; Figure A.20
Underpurlins are supported either by struts from walls below or by the principal rafters of roof trusses. Underpurlins are also called ‘purlins’, but a distinction should always be made between the two types.
See also: purlin
