Hi Community, has anyone got any tips on how to build a trap door into the top of an existing deck? I need to access my external hot water cylinder from the top of the deck as access is limited underneath.. How do I even start? The cylinder was replaced by tenants while I was overseas & whoever the installer was, they decided it was a 'good idea' to cut a serious chunk of structural decking joist out in order to get the cylinder to fit. Oh my, why do people not think!!!? How do I fix this issue, without having to replace the cylinder? Can anyone help?