Measurement of formwork to concrete staircase.(explained)

Formwork to concrete staircase is measured under work section E20:25 of SMM 7 and BESMM 2 or 3

Definition rule
A staircase flight is the set of steps or combination of risers and treads in between floors or landings. It is wrong and unacceptable to measure formwork to landings in between flights as part of formwork to staircase flights

Unit of measurement, and Work section code. 
The unit of measurement is in meters (m)

There are three categories of formwork to staircase flights, these are

(a)  Left in (E20:25.1-2.1-2.1)

(b)  Permanent (E20:25.1-2.1-2.2)

(c)  Junction with wall (E20:25.1-2.1-2.3)

All three categories are measured in meters

Description in the BOQ

The following are expected to be given in the descriptions of formwork to staircase flights
1. The width of the staircase flight

2. The waist of the staircase flight 
3. The rise of the riser 

4. The category of formwork being measured

5. Dimensioned diagram (in the case of irregular steps)
It is sometimes good practice to specify the height from the support plane (floor, tread or landing below) to the soffit of the flight.

Measurement rule

The length to be measured for formwork to staircases must be the inclined distance between the first (bottom) nosing and the last (top) nosing of a flight, and the width of staircase flight must be the overall width of the flight.

Coverage rule
The measured length of the stair flight for Formwork to staircase flights includes the formwork to the soffit of staircase flight, formwork to the risers and also the formwork to the strings. These sections (soffit, riser and strings) must not be measured separately as they are deemed to be included in the measured length. The estimator is expected to take this into account during rate build-up. 

Note:

Formwork to landings in between flights are measured separately in accordance with sections E20:9

~ coinloorke 07182012.

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