• NRM2 Work Section 11 In-situ Concrete Works

    Concrete can be either:
    🔗 In-situ concrete - NRM2 Work Section 11
    Precast/composite concrete - NRM2 Work Section 12
    Precast concrete - NRM2 Work Section 13
    concrete structures
    Concrete:
    Is often used for curves and complex, organic shapes / structures
    Has diverse uses; statement buildings to car parks
    Can have a variety of finishes; Impressions, Etchings, Timber effect

    Work Section 11 In-situ concrete works notes the following 📷 items or works to be measured within this work section
    In-situ concrete : 1-7 (7)
    Surface finishes to in-situ concrete : 8-12 (5)
    Formwork : 13-32 (20)
    Reinforcement : 33-37 (5)
    Designed joints in in-situ concrete : 38-40 (3)
    Accessories cast in to in-situ concrete : 41 (1)
    In-situ concrete sundries : 42-44 (3)

    The Work Section begins by detailing the information you should have provided prior to undertaking the measurement task and lists the works and materials deemed included. It is very important to read and understand this 📷 table prior to measuring.
    Some specific points to note :
    Identify work in substructures, superstructures or external works separately and state explicitly
    Concrete is measured NET – no deduction for formwork, reinforcement, chairs/stools, accessories, voids (except troughed and coffered slabs)
    Concrete is deemed cast into formwork unless otherwise described
    Concrete deemed finished ‘as struck’, deemed tamped finished, horizontal

    In-situ Concrete Works

    Prior to the ‘Item or work to be measured’ itself, NRM2 states that in-situ concrete must be classified as one of the following 📷 types:
    (Items in blue are generally the most common types)
    Plain in-situ concrete
    Reinforced in-situ concrete
    Fibre reinforced in-situ concrete
    Sprayed in-situ concrete
    Note that this choice of type before the ‘Item or work to be measured’ is a little different to many other work sections within NRM2.

    Once the type has been classified, each different concrete mix is measured separately; reinforced Mix A or reinforced Mix B etc; Concrete itself is measured in ‘m3’
    * only ever in ‘m2’ for sprayed in-situ (item 11.7)
    * only ever in ‘m’ for sundry work not exceeding 300 wide or thick (item 11.6.1)
    Work is described as mass, horizontal, sloping or vertical
    Work is predominantly described in either: not exceeding 300 thick / wide or exceeding 300 thick / wide
    Concrete can be measured and described:

    Either collectively, in ‘aggregate’
    OR
    The volumes of each type of work can be given separately

    Item or work to be measured 1 : Mass Concrete
    NRM2 Section 11 Mass Concrete

    Mass Concrete is UNREINFORCED bulk concrete work of any thickness and has no formwork

    Possible Application/Example:
    Standard Hatching for Concrete

    Item or work to be measured 2 : Horizontal Work, 3 : Sloping work ≤ 15° and 4: Sloping work ≥ 15°
    NRM2 Section 11 Horizontal/Sloping work
    Level One:
    Works are described as not exceeding 300 or exceeding 300 thick
    Level Two:
    1. In blinding: generally foundations and ground beams laid on blinding or beds laid on sand / whin dust blinding
    2. In structures is used (some choose to further describe as in substructures)

    Here is an example of typical horizontal/sloping works within substructure: (Hover mouse over image below for additional information).
    Perimeter column base detail

    Item or work to be measured 5 : Vertical Work
    NRM2 Vertical Work

    Again, vertical work is also measured in ‘m3’ and described as either not exceeding 300 or exceeding 300.
    The volumes of each type may be given in aggregate or separately
    Note that 📷 ‘Filling to hollow walls’ is essentially cavity fill

    Item or work to be measured 6 : 📷Sundry In-situ Concrete Work
    Any other in-situ concrete works which are not classified in Items 1-5 are measured within Item 6 Sundry works. This includes works such as backsills, machine and plant bases Sundry in-situ concrete work and the like. This item also provides in Level One the need to describe whether the width (not just the thickness as previous items) does or does not exceed 300. Depending on the thickness or width of the works, they are measured in either ‘m’ or ‘m3’ The works are then further described in Level Two as horizontal, sloping or vertical.

    Item or work to be measured 7 : 📷Sprayed In-situ Concrete Work
    The last item for the concrete itself is sprayed in-situ concrete work Sprayed in-situ concrete work This is measured in ‘m2’ with the thickness, method of application and finish stated within the description.Levels 2 and 3 require the location and nature of location to be described.

    Surface Finishes to In-situ Concrete Work

    NRM2 Section 11 Surface Finishes

    All top surfaces of in-situ concrete are deemed to have a tamped finish (rule 7)
    Surface finishes are measured in ‘m2’ regardless of width
    (Hover mouse over photographs below for additional information).
    Surface finishes

    Formwork

    Formwork is a material used to contain, support and form concrete until it has gained sufficient strength to be self-supporting. Formwork can be temporary or left in permanently.
    (Hover mouse over photographs below for additional information).

    Formwork Example Formwork Example 2
    Within NRM2, the beginning of the 📷 formwork section ‘Notes, comments and glossary’ explains 10 points in relation to formwork measurement and description as well as those items deemed included or as standard. It is important to read and understand these prior to taking off any dimensions.

    Unlike in-situ concrete itself, NRM2 requires each type of formwork to be measured and billed separately (items 📷13-21 and 📷22-32) e.g.
    Sides of foundations and bases
    Edges of horizontal work
    Sides and soffits of beams
    Sides of attached columns
    An example of formwork for a strip foundation and pad foundations is shown above.
    Note the different units of measurement and also note the different types of categorising work within Level One:
    Height
    Concrete thickness
    Shape regularity (📷see notes 1 and 2 highlighted for shape regularity)
    Note: formwork would not be required for cavity fill as the masonry walls would be supporting the concrete.

    Example :
    Strip foundation : 600 x 150 deep
    Type A pad foundation : 2100 x 2100 x 450 deep
    Type B pad foundation : 3000 x 5000 x 550 deep
    Sides of foundations and bases
    Not exceeding 500 high – measured in ‘m’ - strip and Type A pad
    Exceeding 500 high – measured in ‘m2’ – Type B pad
    Formwork Example

    🔗 23 Extra over and 31 Complex shapes

    Reinforcement

    Items or work to be measured 33 – 37 relate to 📷concrete reinforcement.Things to note about reinforced concrete:
    Reinforced concrete needs formwork (chairs/stools) to maintain the ‘cover’ to the reinforcement
    When pouring reinforced concrete on earth or hardcore, a blinding layer of weak mix concrete is necessary
    No deduction is made for the volume of reinforcement – concrete is NET!

    Some examples of reinforcement are shown below:
    Reinforcement Sections

    Item or work to be measured 33 : Mild Steel Bars and 34 : High Yield Steel Bars
    Items 33 and 34 reinforcement bars are measured in ‘t’, remember this means they are billed to 2 decimal places!
    Generally, the tonnage for reinforcement bars is taken directly from the engineers bar bending schedule (an example of a bar bending schedule is within the supplementary information tab)

    Reinforcement Bars Example

    Item or work to be measured 37 : Mesh
    Item 37 reinforcement mesh is measured in ‘m2’
    All laps, stools, chairs and supports are deemed included
    Voids < 1.00m2 are not deducted
    The weight per m2 and fabric reference is stated. Weights per m2 can be found from steel manufacturers and the fabric reference should be within the specification

    Reinforcement Mesh Example

    Designed Joints in In-situ Concrete

    Joints NOT located at the discretion of the Contractor, MUST be measured – See note 1
    Joints at the discretion of the contractor would include construction day joints etc…
    Some joints will also be at the discretion of specialists – such as flooring or screed subs

    Joints are 📷measured in linear ‘m’
    "Details of primers, cleaners, fillers, waterstops, backing strips, reinforcement, ties, sealants, the method of application, preparation and the like, shall be stated in the description."

    All preparation, cleaners, primers, sealers, angles, ends and the like are deemed included
    Joint types include:
    Plain (do not require formwork – see note 1)
    Formed (require formwork, deemed included – see note 2)
    Cut

    Isolation joint/Slab edge detail

    The following are deemed included:
    preparation, cleaners, primers, sealers
    angles, ends, intersections regardless if formed, welded or purpose made

    Saw restarined movement joint detail

    📷Accessories Cast Into In-situ Concrete

    Accessories cast into in-situ concrete must have the kind, quality and size or the manufacturers reference stated.
    The unit of measurement differs depending on the item, however, note Level Two which states that linear or superficial quantities must describe any appropriate spacing dimensions.
    The ‘Notes, comments and glossary’ column has detailed information regarding which accessories are included or excluded.

    📷In-situ Concrete Sundries

    The final group of items or works to be measured within the Work Section is in-situ concrete sundries.
    All require a dimension description and all necessary formwork or temporary support is deemed included.

    Sundries-Grouting Sundries-Chases Sundries-Holes
    x
    NRM2 Section 11 Measurable Items
    x
    NRM2 Section 11 Highlighted Points
    x
    NRM2 Section 11 Vertical Work
    x
    NRM2 Section 11 Horizontal work
    x
    NRM2 Section 11 Sloping work
    x
    NRM2 Section 11 Sundry/Sprayed in-situ concrete work
    x
    NRM2 Section 11 Sundry/Sprayed in-situ concrete work
    x
    NRM2 Section 11 Formwork
    x
    NRM2 Section 11 Formwork, Shape regularity
    x
    NRM2 Section 11 Reinforcement
    x
    NRM2 Section 11 Designed joints
    x
    NRM2 Section 11 Accessories
    x
    NRM2 Section 11 Sundries
    x
    NRM2 Section 11 In-situ concrete works

  • The Task

    Take off the quantities for the superstructure concrete frame (including excavation works).
    Starting your measurement task

    Dimension paper
    Gather all the materials you may need:
    Dimension paper/Take off Sheet
    Standard / Method of measurement
    Scale Rule
    Query Sheet

    Gather all the information:
    Drawings
    Specifications
    Schedules
    Set up your Dimension Paper/Take off Sheet:
    Project Title / Reference
    Surveyor Reference / Initials
    Date
    Number the columns/pages
    List information used/Work Section
    Take off List
    Analyse the information:
    Do you have everything you will need?
    Is there information missing/conflicting?
    Do you require clarification/assumptions?

    Setting Out Dimensions

    Best Practice:
    Take-off list
    Write dimensions clearly
    Never use pencil or correction fluid
    Record dimensions to two decimal places; 78.12
    Record waste dimensions to three decimal places; 78.123
    Leave plenty of space
    Dimensions and descriptions are clearly bracketed
    Signpost and annotate dimensions
    State assumptions clearly
    Send query lists
    Write dimensions in the order of: length, width, height/depth

  • Take off List

    NRM2: PART 3, SECTION 11 - IN-SITU CONCRETE WORKS

    SUPERSTRUCTURE

    Concrete: Reinforced horizontal - Slabs, Attached beams (perimeter and internal)
    Reinforced vertical - Columns, Parapet wall
    Formwork: Exceeding 500 - slab soffit, edge, columns, beams, parapet wall
    Reinforcement: mesh to slabs/bar reinforcement (excluded)

  • The Task: Work Section 11 - Superstructure

  • The Task: Completed Take-off

    Dimension Paper
    This is the take-off on traditional dimension paper; it has been created using a word document and saved as individual pdf documents for 🔗Work Section 5 and 🔗Work Section 11

    Excel Take Off
    This is the take-off having been created using Excel and saved as a 🔗pdf document.

    Note that traditional measurement conventions have been applied, even when taking-off electronically:
    Project reference/QS reference/Date in top left hand corner
    Each page is numbered
    There is a list of the information (drawings and specification) used
    The dimensions are in the order of length, width, height/depth and preceded by the ‘timesing’ column
    Add and Deduct are underlined as per convention
    Waste calculations are to 3 decimal places
    Dimensions are to 2 decimal places
    Quantities to be transferred are rounded to whole numbers and highlighted/shaded to identify they have been transferred to a Bill

  • The Task: Example Bill of Quantities

    Once you have completed the take-off, it is then ready to be transferred into a 🔗Bill of Quantities.
    This example has been created using Excel and follows the Work Section breakdown structure.

  • Summary of Week

    Upon completion of this week, you should now:
    Understand the principles of taking off In-situ Concrete Works in accordance with NRM2 and measurement conventions.
    Be able to apply your knowledge of construction technology and the measurement standard when interpreting the written and drawn information to produce a take-off.
    Have an appreciation of the documentation produced following your measurement task.

  • Supplementary Information

    Conventional construction drawing hatching for concrete:

    Standard Hatching for Concrete
    🔗 An Example Tender Specification
    🔗 An Example Bar Bending Schedule

    Video Animations for Concrete Framed Structures
    📹 3D Animation of the construction of a Multi Story Building
    📹 Reinforced Concrete Building Design - Sketch Up Animation