An angle adjustable tread holding bracket comprising a first bracket member having a first triangular shaped body member including a first opening; and a second bracket member rotationally attached to the first bracket member via a pin hinge member, wherein the second bracket member includes a second triangular shaped body member having a U-shaped slot allowing the first triangular shaped body member of the first bracket member to be inserted into the U-shaped slot enabling the angle of the tread holding bracket to be adjusted, wherein the second triangular shaped body member includes an arcuate groove and a second opening.

An angle adjustable tread holding bracket comprising a first bracket member having a first triangular shaped body member including a first opening; and a second bracket member rotationally attached to the first bracket member via a pin hinge member, wherein the second bracket member includes a second triangular shaped body member having a U-shaped slot allowing the first triangular shaped body member of the first bracket member to be inserted into the U-shaped slot enabling the angle of the tread holding bracket to be adjusted, wherein the second triangular shaped body member includes an arcuate groove and a second opening.

A platform system comprising a platform structure having at least one modular platform unit with platform connection features on a side surface thereof to which other components can be connected, the other components including at least two of the following: another modular platform unit, a stair unit, a tower unit, a handrail unit, and a ladder unit. A stair assembly is connected to the platform structure via said connection features, the stair assembly comprising a plurality of stair units connected together to provide a number of steps equal to the sum of steps of the stair units.

A platform system comprising a platform structure having at least one modular platform unit with platform connection features on a side surface thereof to which other components can be connected, the other components including at least two of the following: another modular platform unit, a stair unit, a tower unit, a handrail unit, and a ladder unit. A stair assembly is connected to the platform structure via said connection features, the stair assembly comprising a plurality of stair units connected together to provide a number of steps equal to the sum of steps of the stair units.

A bracket and related method to construct stairways is provided. The bracket includes a top horizontal leg having a first width and a first spacer of a first dimension and a second spacer of a smaller second dimension, and a vertical leg joined with the top leg, the vertical leg having a first height, with a ratio of the first width to the first height being at least 1:2. The method can include placing the top leg adjacent an underside of stair boards, selectively altering or not altering the first spacer based on a preselected gap between the boards, fastening the top leg to the underside of the boards with fasteners while the first spacer and/or the second spacer maintains the preselected gap, placing the bracket vertical leg adjacent a stringer, and fastening the vertical leg to the stringer, optionally while the installer remains above the stairway and stringer.

A bracket and related method to construct stairways is provided. The bracket includes a top horizontal leg having a first width and a first spacer of a first dimension and a second spacer of a smaller second dimension, and a vertical leg joined with the top leg, the vertical leg having a first height, with a ratio of the first width to the first height being at least 1:2. The method can include placing the top leg adjacent an underside of stair boards, selectively altering or not altering the first spacer based on a preselected gap between the boards, fastening the top leg to the underside of the boards with fasteners while the first spacer and/or the second spacer maintains the preselected gap, placing the bracket vertical leg adjacent a stringer, and fastening the vertical leg to the stringer, optionally while the installer remains above the stairway and stringer.

The stair system is made of a deck plate attached to an existing structure (such as a deck) and to the top end of a pair of stringer beams. A base plate is attached to the bottom end of the pair of stringer beams. Next a plurality of steps are attached to the pair of stringer beams, the steps being comprised of a tread assembly, a pair of tread brackets and at least one intermediate support bracket. The steps can be integrally formed or made of modular components which are connected together to form the step. Finally, the decking material is attached to the step.

A platform system comprising a platform structure having at least one modular platform unit with platform connection features on a side surface thereof to which other components can be connected, the other components including at least two of the following: another modular platform unit, a stair unit, a tower unit, a handrail unit, and a ladder unit. A stair assembly is connected to the platform structure via said connection features, the stair assembly comprising a plurality of stair units connected together to provide a number of steps equal to the sum of steps of the stair units.

A platform system comprising a platform structure having at least one modular platform unit with platform connection features on a side surface thereof to which other components can be connected, the other components including at least two of the following: another modular platform unit, a stair unit, a tower unit, a handrail unit, and a ladder unit. A stair assembly is connected to the platform structure via said connection features, the stair assembly comprising a plurality of stair units connected together to provide a number of steps equal to the sum of steps of the stair units.

A stair stringer includes a pair of joists each including an upper wall, a first lateral wall extending from the upper wall, and a second lateral wall extending from the upper wall. At least one stair step support bracket includes a tray support wall, a first side wall extending from the tray support wall, a second side wall extending from the tray support wall, and a front wall extending between the first side wall and the second side wall. The at least one stair step support bracket is configured to set on the upper wall of one of the pair of joists and the first side wall extending downward beyond the upper wall of the one joist in position to receive a first fastener through the first side wall and into the first lateral wall of the one joist, and the second side wall extending downward beyond the upper wall of the one joist in position to receive a second fastener through the second side wall and into the second lateral wall of the one joist, wherein the tray support wall is level.