RAMCO HILUX

India's best rated Boards & Tiles for Wall, Ceiling, Panel Systems. It introduced the innovative Calcium Silicate Board, a versatile building material, using Japanese technology from the ASK Corporation, Japan.Dealer,Manufacturer,India,producers

Ceiling Solution      >>       INSTALLATION
  • SUSPENDED CEILINGS
  • STRUCTURAL STEEL CLADDING
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    Exposed Grid System
    STRUCTURAL STEEL CLADDING

    The Building regulations require certain elements of structure to have fire resistance for a specific minimum period of time. The amount of fire protection to achieve this depends on the following :

    1. Duration of fire resistance specified
    2. Type of protection used
    3. Shape and size of the steel section

    The degree of fire protection depends on the Hp/A section factor for the steel section. The Hp/A factor is a function of the area of the steel exposed to the fire and the mass of the steel section. The higher the Hp/A, the faster the steel section heats up, and so the greater the thickness of fire protection material required.

    Box Protection

    In the case of Box protection, Hp is the sum of the inside dimensions of the smallest possible rectangular or square encasement of the steel section (except for circular hollow sections) where a steel section abuts, or is built into a fire resisting wall or floor, the surface in contact with or the surface within the wall or floor, is ignored when calculating Hp. However the value A is always the total cross- sectional area of the steel section. Encasements following the profile of Ceiling Section 610 mm centres Perimeter assembled to form a ladder frame work Notched ends set at max 610 mm centres Two layers of Hilux Calcium Silicate Board Screwed to all framing members at max 200 mm centres DOUBLE LAYER COLUMN ENCASEMENT Universal Column DOUBLE LAYER BEAM ENCASEMENT Perimeter fixed to soffit at 600 mm c/c Two layers of Hilux Calcium Silicate Board screwed to all framing members at max 200 mm centre Perimeter channel Ceiling section at 610 mm c/c the steel section will generally have a higher Hp/A value than a box encasement (except circular hollow sections). The serial size and mass per metre of most steel sections are available in tables with steel manufacturers which also give Hp/A values calculated for 3 or 4 sided box protection :

    Note: For partially exposed members, the A value is still the total cross sectional area of the section being protected.

    Example-1:

    Steel beam, serial size 457 x 191 x 98 Kg/m to be encased on three sides

                Serial size : 457 mm x 191 mm

                Actual size: 467.4 mm (D) x 192.8 mm (B)

                Hp : B+2D =192.8+467.4+467.4 =1127.6 mm =1.1276 m

                A :125.3 cm2 =0.01253 m2

                Hp/A :1.1276/0.01253=89.99=90 m-1

    From this, the required thickness of the Hilux Calcium Silicate Boards can be found for different period of fire protection by using the following Tables :

    Table-1

    Showing Hilux boards thickness (mm) required as per Maximum Hp/A section factor (m )for up to 2 hours of fire protection in accordance with the requirements of BS-476: Part 21 and AS 1530: Part -4

    Fire Resistance (hours) Hilux Calcium Silicate Board thickness in (mm)
    810121618202224262830323436
    1/2 260260260260260260260260260260260260260260
    1 4788156260260260260260260260260260260260
    1-1/2 -375679110136151212260260260260260260
    2 --344659707695111139150174204221

    Maximum Hp/A section factor (m-1)

    Partially exposed members

    Where columns or beams are partly built into or are in close contact with wall or floors, then account can be taken of the protection afforded to the steel work by the wall or floor. In the case of masonary work then this will give protection to the adjacent surface of the steel work so that for the purpose of determining the heated perimeter, Hp, this should be taken as only that which is exposed.

    INSTALLATION

    Four sides encasement

    • Determine the thickness of the board to be used as per the Hp/A section factor for the given fire rating
    • Cut two pieces from the board to match the size of the width of the column
    • G.I. angles 25 x 25 x 0.80 mm are screw fixed to these cut boards at their longitudinal edges, using self taping screws at 200 mm centres
    • Ceiling sections are screw fixed across to angle at 610 mm centres
    • These are placed vertically on both sides of the column, facing each other
    • Cut another two pieces two suite the length of the column/beam + twice the thickness of the boards used
    • Screw these new pieces to already vertically placed boards (fixed with G.I. angle) with self taping screws at 200 mm centres
    • If the height of the casing exceeds the length of the board a horizontal member is provided to support the edges of the boards
    • Jointing and finishing can be done as usual

    Three sides encasement

    • In this case G.I. Angle 25 x 25 x 0.80 mm thick is fixed to the wall or partition on the both sides of the column
    • A piece of board is cut to size of opposite side and G.I. angle is screw fixed on the longitudinal edges of the cut piece
    • Ceiling sections are screw fixed across to angle at 610 mm centres
    • This is placed vertically with just opposite side of the column
    • Another piece cut from the board (Actual measurement + thickness of the boards used) is screw fixed to both, the angle fixed to the wall/partition and the angle of vertically placed board at 200 mm centres with self taping screws
    • Another piece cut from the board as above, is screw fixed to other side of the column, to both the angle fixed to the wall/partition and the angle of vertically placed board at 200 mm centres with self taping screws
    • Jointing and finishing can be done as usual

    Two sides encasement

    • G.I. angles 25 x 25 x 0.80 are fixed to the walls/partition on both sides of the column with metal fasteners at 450 mm centres
    • A piece of board is cut to size of one side and an angle is screw fixed to one of the edge of this cut piece at 200 mm centres
    • Ceiling sections are screw fixed across to angle at 610 mm centres
    • This is placed against the column, keeping the angle side opposite to the wall. Other edge of this board is screw fixed to the already fixed angle (with the wall/partition) at 200 mm centres with self taping screws
    • Another piece cut to size is screw fixed to the remaining side of the column at 200 mm centres with self taping screws
    • Jointing and finishing can be done as usual

    One side encasement

    • G.I. perimeter channel is fixed to the both sides of the wall/partition with metal fasteners at 450 mm centres. Hilux Calcium Silicate Board of suitable size are screw fixed to the perimeter channel at 200 mm centres
    • Jointing and finishing can be done as usual

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