The Austronesian Comparative Dictionary

*paR(e)bu one of the four principal rafters

PPh paR(e)bu one of the four principal rafters

WMP
Ilokano parbó the four rafters that meet the (hip rafters) at their upper end, near the ridge of the roof
Hanunóo pagbú one of the four principal rafters, frequently of bamboo, used in the Hanuno'o construction of a house roof
Aklanon págbo beam, girder (supporting roof)