Cutting out of the floor covering to accept the top nosing/tread
Making sure the correct amount of operatives are available to compensate the weight, offer the staircase up into position (making sure the staircase is back tight against the spacing laths) and sit the underside of the top nosing/tread onto the floor covering on the upper floor, mark around the back and sides of the nosing/tread using the pencil, remove the staircase back down to the ground and position safely, cut out to the lines just made on the floor covering using the hammer and chisel.
Fixing of the top nosing/tread
Making sure the correct amount of operatives is available to compensate the weight of the staircase, offer the staircase up into position, the staircase should now sit tight against the spacing lath to the wall and into the house just made in the floor covering to the upper floor, fix the top nosing/tread into the stairwell trimmer using the screw gun.
Levelling up the staircase
Put the spirit level onto the treads of the staircase across their depth (from back to front) lift the staircase and pack as required until the staircase is level across the depth of the treads, place the treads of the staircase across there length (from string to string) lift the staircase and pack as required until the staircase is level across the length of the treads.
Fixing of the staircase
Drill through the string with the spacing laths on the back. Put a plastic plug into the hole and hammer it down. Place a screw into the plug and hammer until the plug is in the wall, tighten the screw until the head is sat below the string. Continue the process until the staircase is solid to walk on.
Temporary handrail - using a screw gun
Once the staircase is fully fixed place a length of timber from newel post to newel post and fix at both ends at a height of 450mm/18 inches from the top of the tread using the screw gun, repeat the process at a height of 900mm/36 inches for the second rail.
If working on a unit with more than one upper level and the stairwells fall in line with each other, you must ensure that a scaffolding platform has been installed prior to fitting the staircase.
If using any access equipment, please refer to the relevant risk assessment for that particular piece of equipment.