PS upon looking very closely at the 4.5mm edge, one sheet has some green print on it. From memory, the Villaboard had this print on it, not the Hardie ...

Hey Mitchell, thanks for the reply. The sheets I purchased from Bunnings did not have any printed text on it. I got the 3000 x 1200 x 4.5 and the 24 ...

Thanks, Jacob! So with the flat bar, should I glue it to the board but allow a small gap (1-2mm) along the beam and fill that with a flexible paintabl ...

Thanks, Dave. I was thinking aluminium because it would be very thin, maybe 1.3mm, so hopefully almost invisible on the edges once painted. As the bea ...