Last week Simplicity cancelled all contracts to buy Gib for its first 550 affordable homes in Auckland.
It offered to share details on how to import high-quality substitutes and has already received more than 60 inquiries from developers and builders.
They range from New Zealand's biggest group home builders to family-run developers, all over New Zealand.
"The number of inquiries in such a short time confirms that this is a nationwide crisis," Brealey said.
The association is also attending the meeting, given its long-standing concerns regarding the governance of Fletcher Building.
"We're concerned about the political and reputational impacts caused by the Gib supply issue on the sustainability of shareholder returns," said association chief executive Oliver Mander.
Stubbs said he hoped the meeting would be open and constructive.
"As a customer of Fletcher Building, we have voted with our feet and cancelled all future Gib orders and as a shareholder, we want to understand how they can better deliver for all stakeholders," he said.
The meeting is scheduled for this Friday.
Taylor said the company understood people's views.
Fletcher has a three-pronged strategy to ease the crisis: running its mills 24/7, working with merchants to create a fair distribution of supply, and opening a new $400m plant at Tauriko, Tauranga.