You can order identical grating treads and still leave an uneven step at the landing.
Check the complete flight against finished floor levels before approving the tread schedule.
Start from finished landing levels
Give your stair designer the lower and upper landing levels that govern the completed installation. Identify the datum on the drawing.
Label the structural steel levels and finished walking surfaces separately.
If the platform includes a finish or a separate flooring panel, show its accepted build-up at the stair interface.
Have the designer locate the finished surface. Do not make the tread fabricator infer that level from a beam elevation.
For an existing stair, survey the relevant flight and landings together. Record the location and references of each observation.
Identify any unfinished or concealed surface that prevents you from confirming the final condition.
Label provisional levels before sending them for quotation. Ask your project team which decisions can proceed and which need confirmation before production.
Confirm the remaining levels before releasing the tread geometry for production.
Keep the top and bottom interfaces visible on the section drawing.
Your supplier needs to see where the first tread sits relative to the lower floor and how the last tread meets the upper landing.
Where several flights serve one platform, give each its own reference. Use those references in the tread schedule and drawing package.
This avoids applying a dimension from a similar flight to a different landing condition.
Obtain the project's geometric acceptance basis
Have your responsible designer identify the requirements applicable to your stair and its use.
Retain the accepted rise, going and relevant tolerances in the project drawings. Use those requirements when reviewing the complete installed flight.
Do not copy a dimensional limit from a catalogue example or another site’s stair. Different project requirements can apply.
Ask the reviewer to resolve the actual acceptance basis before you describe the order as compliant.
Show how your drawing defines the relevant walking edges and surfaces. Keep that definition consistent in the tread detail and inspection plan.
An overall grating depth is not automatically the same measurement as the required stair going.
Identify the installation condition represented by the geometry review. For a replacement flight, include the supporting steel and finished landings retained in place.
Have proposed changes assessed against those actual interfaces.
If your contractor and fabricator use different terms for width, depth or run, label the dimensions on a common sketch.
Confirm the direction of measurement. Resolve that terminology before comparing their schedules.
Record the approved geometry with its revision. Give the supplier one governing detail instead of a mixture of preliminary elevations and later tread dimensions.
Keep the superseded information available for traceability, clearly marked as superseded.
Coordinate tread height with the connection detail
Ask your supplier for a section showing the finished tread assembly and its attachment to the stringer.
Include the grating section, end plates and nosing. Have the designer confirm the resulting walking surface position.
Check which datum the end-plate hole locations use. Compare it with the stair drawing’s connection reference.
If the tread’s surface sits at an offset from that reference, have the submitted detail show the offset explicitly.
Retain the proposed material and bearing bar section in the review.
A change in the tread construction should trigger a check of the installed geometry and structural submission.
Keep the accepted changes in the same drawing package.
Where a supplier proposes an alternative nosing, request its complete assembly detail. Have the designer check its finished position against the intended stair geometry.
Resolve its interface with the landing as part of that review.
For a welded tread attachment, identify the approved connection and installation requirements. For a bolted arrangement, show the relevant hole pattern and specified hardware.
Neither connection description should leave the final surface elevation uncertain.
Ask your installer to confirm it can achieve the accepted arrangement using the supplied parts. Record any access or assembly issue before production.
The shop drawing should describe the connection the site team will actually install.
Review the first and last steps explicitly
Check the lower floor to first tread relationship on the complete flight section. Include the finished lower surface used by the designer.
Keep this check separate from the repeated dimensions between intermediate treads.
At the upper end, show the last tread and landing edge together. Ask the designer to resolve the accepted going and rise measurements there.
Include the actual platform flooring assembly where it affects that interface.
If the landing panel is supplied by another contractor, exchange the relevant details before release. Identify who confirms the interface levels and edge positions.
Give both suppliers the accepted information for their fabrication drawings.
Record an unresolved landing finish as an open coordination item. Have the project team close it before the final geometry approval.
Avoid absorbing an unknown floor build-up into a site adjustment without review.
For a retrofit, document any difference between the surveyed arrangement and the original drawing. Give the actual condition to the designer.
Obtain a disposition before assuming the replacement can reproduce an obsolete tread schedule.
Keep any special first or last tread identifiable in the quantity list. Include its drawing reference and mark.
Identify a distinct end condition in the batch marks so your installer can locate the correct tread.
Check the whole flight before batch release
Ask your fabricator and stair contractor what trial assembly or dimensional review is useful for your project. Agree the scope and references.
Include the landing interfaces where the proposed check is intended to demonstrate them.
A single tread sample can show its construction and finish. For flight geometry, have your reviewer identify the additional assembled information needed.
Keep the sample’s acceptance limited to the features actually examined.
Compare the tread schedule with the released stringer drawing. Check the quantity and positions against the same flight reference.
Resolve a mismatch before the supplier repeats that detail across the production batch.
Where a template is used for connection checks, record the dimensions it represents and its revision.
Ask the responsible reviewer how the template is confirmed. Retain that information alongside the measurement results.
Include the finished condition in the dimensional inspection scope. Ask whether any planned production stage requires a repeat check.
State the inspected tread construction and production stage in the report.
If your first assembly reveals a discrepancy, record the actual dimensions and affected marks. Ask the designer and suppliers to resolve the cause.
Obtain a revised instruction before using the same adjustment on the remaining flight.
Treat adjustment as a reviewed change
If the installer proposes packing beneath a tread, submit the proposed arrangement for review. Show how it changes the surface level and connection.
Obtain the applicable technical approval before treating the packing as an accepted solution.
Likewise, refer a proposed hole enlargement or changed slot to the responsible reviewer. Identify the affected end plate and hardware.
Keep the original observation, approved modification and required inspection in the record.
Do not relocate an individual tread solely to improve one measured step without checking the resulting flight. Give the revised positions to the designer.
Have the complete geometry and connection arrangement assessed.
If an alternative tread section is accepted during procurement, update its dimensions on the stair drawing. Ask the supplier for the revised assembly detail.
Keep the structural evidence and installed surface position consistent with that proposal.
Record changes by flight and tread mark. Tell the fabricator which revision governs each affected item.
This is particularly useful when part of the order has already been manufactured or delivered.
Inspect the completed installation from common references
Agree how your project will measure the installed stair against its accepted criteria. Identify the finished surfaces and edge references.
Give the inspector the current drawings and any approved connection changes.
Record the results for the flight being checked. Include the first and last step interfaces as required by your inspection scope.
Avoid presenting measurements from a different flight as confirmation of this installation.
Check the tread marks and orientation against the layout before completing the dimensional report.
If the connection or supplied part differs from the accepted detail, record that discrepancy for review.
Where an area remains unfinished, state the limitation of the inspection. Arrange the remaining check after the relevant walking surface is complete.
Limit the steelwork survey record to the condition inspected until the finished surfaces are checked.
Keep any failed or unresolved dimension connected to its actual location. Request a written disposition and any required repeat inspection.
Retain the original reading so the final record explains the change.
Compare quotations against the accepted assembly
Send each bidder the same flight geometry and tread construction requirements.
Identify whether it supplies only treads or also participates in the stringer and landing coordination. Keep that scope visible in your price comparison.
Ask bidders to list deviations in section, nosing and connection detail. Have the responsible designer review alternatives that affect installed geometry.
Include any required drawing or trial assembly work in the accepted supply scope.
Confirm which hardware and inspection records are included. If your contractor supplies a component affecting the connection, identify it on the schedule.
Resolve that interface before accepting a price based on an incomplete assembly.
At handover, retain the installed flight drawing with its accepted tread details. Include dimensional inspection and approved changes.
Give your maintenance team the completed stair record as the basis for a future replacement order.
Questions about your stair flight
Can identical treads prove the whole flight is correct?
Check the assembled stair against the project’s accepted geometry. Include its finished landings, tread surface positions and connection details.
Identical supplied parts do not confirm those site interfaces by themselves.
Have the responsible reviewer define the required dimensional checks and retain the results for the particular flight before closing its installation acceptance.
Should you use the catalogue's rise and going dimensions?
Have your stair designer identify the requirements applicable to your project and use. Keep the accepted dimensions and tolerances in the released drawings.
Catalogue examples can explain a manufacturer’s tread detail, but your supplier needs the actual flight geometry and connections you have approved.
Resolve any terminology difference before treating its proposed assembly as accepted.
What if your landing level changes after ordering?
Give the revised finished level to your designer and supplier. Identify the affected flight, tread marks and connection details.
Obtain the revised geometry and technical disposition before making a site adjustment.
Keep any accepted modification and repeat inspection with the installed drawing so future replacements follow the final stair arrangement.
Send the full flight with your tread enquiry
Review your stair tread options with the finished landing levels, accepted flight geometry and connection details.
Include special first or last tread marks in the schedule.
