Police installed a scene guard overnight and carried out a thorough examination on Friday, Mr Rapata helping Detective Bill Dawson and specialist fire investigator Craig Bain as they searched for evidence as to how the fire started.
Police were also speaking to people at Matauri Bay who had witnessed the incident or knew how the fire started. They were looking for a specific man to hear his account of what happened.
Anyone else with information was urged to call the Kerikeri police station on (09) 407-9211 and ask to speak to one of the CIB staff or leave a message.
Kaeo's chief fire officer, Lindsay Murray, said the house was burning fiercely when the brigade arrived. The Kerikeri brigade sent a tanker and shuttled water from a nearby creek with the aid of a portable pump.
The Kaeo volunteers returned on Friday to continue dampening down the ashes and charred framing that remained.
Until they find a new home Mr Rapata and his family will be staying with his father on the neighbouring property.