Floor drainage system for a building and assembly therefor

1. A building having a first floor, a second floor disposed above the first floor, the second floor including both a room and a stairwell threshold, a stairwell connecting the first floor to the second floor, the stairwell being pressurized, the second floor being in communication with the stairwell via the stairwell threshold, and a floor drainage and water containment assembly including:

a stairwell drain extending below the second floor;

a stairwell trough extending along the stairwell threshold, the stairwell trough being adjacent to and in communication with the room, the stairwell trough being in fluid communication with the stairwell drain, whereby water from the second floor entering the stairwell threshold is at least partially captured by the stairwell trough and directed to the stairwell drain;

an additional stairwell drain;

an additional stairwell trough extending along the stairwell threshold, the additional stairwell trough being adjacent to and in communication with the stairwell and being in fluid communication with the additional stairwell drain, the additional stairwell drain further capturing water from the stairwell that enters the stairwell threshold;

a stairwell pipe having an interior and a divider disposed within the interior of the stairwell pipe, the divider being shaped to split the stairwell pipe into a first part and a second part sealed from the first part, the first part of the stairwell pipe being part of the stairwell drain and the second part of the stairwell pipe being part of the additional stairwell drain;

a catch basin disposed below the second floor, the stairwell drain connecting the stairwell trough to the catch basin and the additional stairwell drain connecting the additional stairwell trough to the catch basin, the stairwell drain being interposed between the stairwell trough and the catch basin, and the additional stairwell drain being interposed between the additional stairwell trough and the catch basin;

a hoistway connecting the first floor to the second floor, the hoistway having a length, the second floor further having a hoistway threshold and being in communication with the hoistway via the hoistway threshold;

a hoistway trough adjacent to and spaced-apart from the hoistway, the hoistway trough extending adjacent to the hoistway threshold and along the entire length of the hoistway;

a hoistway trough drain; and a junction connecting together the stairwell pipe and hoistway trough drain, the hoistway trough being in fluid communication with the hoistway trough drain, whereby water from the second floor seeking to enter the hoistway threshold is at least partially captured by the hoistway trough and directed to the hoistway trough drain.

2. The building as claimed in claim 1 , further including a threshold plate for extending along the stairwell threshold, the threshold plate comprising:

a first portion at least partially disposed towards the room and having a plurality of apertures extending therethrough, the apertures positioned to receive water passing over the threshold plate, the first portion operatively connecting to the stairwell drain via said apertures; and

a second portion at least partially disposed towards the stairwell landing and having a plurality of apertures extending therethrough, the apertures of the second portion positioned to receive water passing over the threshold plate, the second portion operatively connecting to an additional drain via said apertures of the second portion.

3. The building as claimed in claim 2 , wherein the threshold plate is isosceles trapezoid shaped in cross-section.

4. The building as claimed in claim 2 , wherein the threshold plate includes a middle portion between its first portion and its second portion, and where in the building further includes a closed door, the threshold being disposed below the closed door.

5. The building as claimed in claim 1 , wherein the stairwell trough is formed as part of the second floor and wherein the stairwell drain is cast in place.

6. The building as claimed in claim 1 , wherein the hoistway trough is formed as part of the second floor and wherein the hoistway drain is cast in place.

7. The building as claimed in claim 1 , the second floor including both a further room and a further stairwell threshold, the building including a further stairwell connecting the first floor to the second floor, the further stairwell being pressurized, the further room being in communication with the further stairwell via the further stairwell threshold, and the floor drainage and water containment assembly further including:

a further stairwell drain extending below the second floor;

a further stairwell trough extending along the further stairwell threshold, the further stairwell trough being adjacent to and in communication with the further room, the further stairwell trough being in fluid communication with the further stairwell drain, whereby water from the second floor entering the further stairwell threshold is at least partially captured by the further stairwell trough and directed to the further stairwell drain;

yet another stairwell drain; and

yet another stairwell trough extending along the further stairwell threshold, said yet another additional stairwell trough being adjacent to and in communication with the further stairwell and being in fluid communication with the yet another stairwell drain, the yet another stairwell drain further capturing water from the further stairwell that enters the further stairwell threshold.

8. The building as claimed in claim 7 , wherein the further stairwell drain connects the further stairwell trough to the catch basin and the yet another stairwell drain connects the yet another stairwell trough to the catch basin.