Further testing has been ordered to establish whether cladding used on one of Queensland's biggest hospitals is fire-retardant after initial results were inconclusive.
Housing and Public Works Minister Mick de Brenni announced last month the discovery of potentially non-fire retardant cladding on Brisbane's Princess Alexandra Hospital.
His office was due to receive test results last week, however additional tests are now under way after primary results were uncertain.
Mr de Brenni was quick to allay fears at the time of the announcement, saying the risk of a fire incident at the hospital was low.
The product in question was supplied to the construction industry in the late-1990s and was sold in both retardant and non-retardant versions.
PA Hospital contains 24,000 square metres of cladding.
Security at the hospital and the emergency response to a fire at the facility were increased after the discovery.
Routine inspection of a Brisbane building site had also identified suspected non-conforming cladding, Mr de Brenni said.
The discoveries prompted a state-wide investigation into the use of the material.
Fifteen officers from the Queensland Building and Construction Commission, QFES and Mr de Brenni's department were set to work identifying buildings constructed between 1994 and 2004, the period during which the PA Hospital was built, that may contain such products.
"This is the period when aluminium composite cladding started to appear on Queensland buildings," the minister said.
"It is also the period when less appears to be known about these products and fire-retardant products had not appeared at scale on the market at the time."
The investigation will focus on residential care facilities, hospitals, accommodation buildings, high-occupancy public and private buildings and high rise office buildings across Brisbane, the Gold Coast and the Sunshine Coast.
Officers have since identified two unnamed non-residential buildings in Brisbane supplied with a suspected product.
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