A method is disclosed of attaching a tread assembly of a spiral staircase to a vertical support column. One step of the method involves providing a tread assembly having a tread portion attached to an arcuate mounting plate defining at least one hole through which extends a fastener defining external threads, the mounting plate having a first face defining a first radius of curvature. Another step involves providing a support column extending along an axis, the support column having a plurality of axially and angularly spaced apart tread attachment locations, each of the tread attachment locations having an arcuate outer surface defining a corresponding aperture for receipt of the fastener, the arcuate outer surface defining a second radius of curvature that is greater than the first radius of curvature. According to another step of the method, the tread assembly is loosely connected to one of the tread attachment locations of the support column. According to another step, the fastener is tightened such that the arcuate mounting plate of the tread assembly is elastically deformed to be in substantial engagement with the tread attachment location and applies tension to the elongate fastener to inhibit loosening thereof.

A ceiling ladder having a plurality of sections that can be climbed by a user when in an unfolded position into an attic and that can be folded together into a retracted position to be stored above the ceiling. The ladder has a deep step, which has a width greater than the width of other steps of the ladder, in which is located between about 2-5 feet from the floor when the ladder is in the unfolded position so that a user can stand on the deep step and place objects into the attic without having to climb into the attic.

A ceiling ladder having a plurality of sections that can be climbed by a user when in an unfolded position into an attic and that can be folded together into a retracted position to be stored above the ceiling. The ladder has a deep step, which has a width greater than the width of other steps of the ladder, in which is located between about 2-5 feet from the floor when the ladder is in the unfolded position so that a user can stand on the deep step and place objects into the attic without having to climb into the attic.

A modular platform system utilizing a number of components including a platform. The platform is configured so that each of the components may interchangeably connect to any side of the platform. The components include, for example, handrails and stairways, as well as other platforms. The platform and most of the components are formed from single, continuous pieces of metal.

A modular platform system utilizing a number of components including a platform. The platform is configured so that each of the components may interchangeably connect to any side of the platform. The components include, for example, handrails and stairways, as well as other platforms. The platform and most of the components are formed from single, continuous pieces of metal.

A ramp and/or platform assembly includes a decking system having a tread surface on at least a portion of a top deck surface of the decking system, wherein the tread surface includes a plurality of multi-tiered ridges on the top deck surface for contact with a traveling body on the top deck surface.

A ramp and/or platform assembly includes a decking system having a tread surface on at least a portion of a top deck surface of the decking system, wherein the tread surface includes a plurality of multi-tiered ridges on the top deck surface for contact with a traveling body on the top deck surface.

A stair tread pan includes a plurality of stair risers, each of the plurality of stair risers comprising a uniform depth and width, whereby the stair tread pan consistently satisfies code requirements. The stair tread pan further comprising predetermined assembly tolerances are less than approximately inch for drainage of the stair tread pan in an exterior use. The stair tread pan comprises at least one tread nosing formed into the stair tread pan for yielding a uniform for reliable and durable tread nosing. The stair tread pan further comprising a poor stop at a top end of the stair tread pan for receiving poured concrete, thereby illuminating the need for tea-bars or other concrete containing structures for forming a top landing on the stair tread pan. The the stair tread maybe read a leap replaced without disturbing the structured integrity outside stair tread pan in a building environment.

A stair tread pan includes a plurality of stair risers, each of the plurality of stair risers comprising a uniform depth and width, whereby the stair tread pan consistently satisfies code requirements. The stair tread pan further comprising predetermined assembly tolerances are less than approximately inch for drainage of the stair tread pan in an exterior use. The stair tread pan comprises at least one tread nosing formed into the stair tread pan for yielding a uniform for reliable and durable tread nosing. The stair tread pan further comprising a poor stop at a top end of the stair tread pan for receiving poured concrete, thereby illuminating the need for tea-bars or other concrete containing structures for forming a top landing on the stair tread pan. The the stair tread maybe read a leap replaced without disturbing the structured integrity outside stair tread pan in a building environment.

A spiral staircase comprises a mounting column extending along a longitudinal axis. A plurality of tread assemblies each having a tread portion attached to a mounting plate is also provided. The tread assemblies are axially and angularly offset from an adjacent tread assemblies along the mounting column. In this aspect, each mounting plate has a first face that engages a corresponding portion of an outer surface of the mounting column and a second face from which the tread portion extends. Each of the tread assemblies further have attachment hardware that secures the mounting plate to the mounting column. Prior to attachment to the mounting column and in an unstressed state, the mounting plate has a first radius of curvature and the corresponding portion of the outer surface of the mounting column has a second radius of curvature. The first radius of curvature is less than the second radius of curvature so that when the mounting plate is secured to the column with the attachment hardware and the second face of the mounting plate substantially engages the mounting column, the mounting plate is in an elastically deformed state applying tension to the attachment hardware to inhibit loosening thereof.