The ends of the beams may be modified to form joints which are used to connect {HEAD ~ two beams} together or to connect {TAIL ~ the beam} to another construction material 
to connect
The ends of the beams may be modified to form joints which are used to connect { HEAD ~ two beams } together or to connect { TAIL ~ the beam } to another construction material
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH