A trial in a Qatari court to decide responsibility for the fatal May fire heard this week there were failures in the mall sprinkler system, which could have stopped the heavy smoke that claimed the lives of the 13 children and six others.
Mr Weekes described details that had emerged about the mall as "just appalling".
"Everything looks shiny and new [but] what is coming out is underneath ... it's just a facade," he told Newstalk ZB.
The court heard sprinklers that should have stopped the smoke "didn't appear to be functioning" and mall officials had not responded to requests from the fire alarm and sprinkler system companies to perform "much-needed maintenance on the mall equipment", Doha News reported.
The court heard evidence that mall officials had been repeatedly fined for using highly flammable paint, which caused the fire "to spread quickly".
Mr Weekes said those responsible for the "complete systemic failure" needed to be held accountable.
The trial resumes on January 3.