Floating modular stair system

A stair tread bracket of a floating modular stair system, the stair tread bracket, comprising:

• a bracket base configured for attachment to a monostringer beam of the floating modular stair system;
• and
• a first bracket mounting plate configured for attachment to a first side of the bracket base and a second bracket mounting plate configured for attachment to a second side of the bracket base, the first and second bracket mounting plates each configured for the attachment to the respective first and second sides of the bracket base with an adjustable anchor point that is rotatable about a fixed pivot anchor point for leveling respective first and second stair tread anchor plates that are configured to support a stair tread of the floating modular stair system.

A floating modular stair system, comprising:

• a monostringer beam attachable to a wall mounting plate and to a base mounting plate;
• and
• stair tread brackets attachable to the monostringer beam for equal spacing of stair treads after installation of the monostringer beam to the wall mounting plate and to the base mounting plate, the stair tread brackets each being a multi-part bracket system that includes a bracket base configured for attachment to the monostringer beam, and first and second bracket mounting plates attachable to the bracket base and configured to support a stair tread.