HKIA Exam Paper 2 Quiz 61

Acceptable elastomeric materials are silicone, neoprene or EPDM sheet (General for Building 2017 Edition – Section 16 – Curtain Walls – Concealed and Exposed Flashing – 16.27).

Reflecting paint shall consist of white synthetic paint with a high gloss finish and a surface coating of fine grain reflective aggregate, applied at the rate of not less than 0.6 kg/m2 while finishing coat is still wet (General for Building 2017 Edition – Section 21 – Painting – Reflecting Paint – 21.23).

Scaffolding members shall provide hand and footholds for climbing at centres not exceeding 0.5m vertically and 0.8m horizontally (General for Building 2017 Edition – Section 26 – Geotechnical Works on Soil and Rock Slopes – Inspection Scaffolding – 26.01).

Plastic films used to opacify glass shall conform to the following requirements:
i. Minimum nominal thickness of polyester shall be 0.08mm. Film shall be pigmented and have a black colour unless otherwise stated.
ii. The bonding surface shall be completely coated with a solvent-based adhesive.
iii. Monolithic opacified glass shall have a safety backing for fallout resistance (General for Building 2017 Edition – Section 20 – Glazing – Plastic Films – 20.01.06).

Pre-planting fertilizer shall be an approved granular slow release compound comprising Nitrogen (N) Phosphorus (P) and Potassium (K) and trace elements in the ratio: 15:9:15:2 (General for Building 2017 Edition – Section 25 – Landscape Work – Pre-Planting Fertilizer – 25.03).

The interval between tapes in a finished blind shall be such that the horizontal deflection of the slats between ladders does not exceed 3 mm (General for Building 2017 Edition – Section 22 – Internal Fittings and Fixtures – Hanging Components – 22.28).

Localized bow refers to any straight line segment with a length of 300 mm on a glass surface (General for Building 2017 Edition – Section 20 – Glazing – Flatness – 20.01.04).

Translucent glass is considered as having:
a. For monolithic glass
b. For laminated glass (General for Building 2017 Edition – Section 20 – Glazing – Translucent & Obscured Glass – 20.04).

The thickness of anodic coating shall be a minimum of 25 microns for external use and 15 microns for internal usage (General for Building 2017 Edition – Section 16 – Curtain Walls – Anodic Coating to Aluminium and Testing of Same – 16.31).

Topsoil: evenly textured, fertile, dark brown or black, free draining, sandy loam with the following properties;
i. The top 300 mm fertile layer immediately below undisturbed vegetation, and not derived from recent paddy field cultivations
ii. Containing not less than 7.5% organic matter
iii. Having a pH value between 5.5 and 7.0
iv. Exchangeable sodium percentage (ESP) %: <15 (General for Building 2017 Edition - Section 25 - Landscape Work - Topsoil - 25.02).

The covering ‘tee’ bar shall be held continuously by friction and not by clips (General for Building 2017 Edition – Section 22 – Internal Fittings and Fixtures – Fixing – 22.15).

Cement grout shall have a minimum cube strength of 30 MPa at 28 days (General for Building 2017 Edition – Section 26 – Geotechnical Works on Soil and Rock Slopes – Grout Material – 26.47).

In addition, the allowable tensile stress of fully toughened glass (tempered glass) for use with unfactored loads shall not exceed the following:
a. 50 N/mm2 for unfactored wind loads.
b. 35 N/mm2 for medium and long-term unfactored loads (General for Building 2017 Edition – Section 20 – Glazing – Criteria for Glass – 20.01.09).

The minimum hole diameter shall be 100mm (General for Building 2017 Edition – Section 26 – Geotechnical Works on Soil and Rock Slopes – Drilling and Preparation of Soil Nail Holes – 26.37).

Composite Panels
a. Composite panels shall have a construction method with a minimum in-use history of 15 years and shall have a minimum overall nominal thickness of 4.0 mm.
b. Face and back sheets shall generally be aluminium with equal thickness of 0.5 mm. Alloy shall be of the 3xxx, 5xxx or 6xxx series and shall satisfy structural and finish requirement
c. Core shall be entirely of non-combustible materials which meet the requirements of BS 476-4 or BS EN 13501-1 Class A1.
d. Edges requiring Vee-cutting to enable folding to occur shall be cut in accordance with the manufacturer’s requirements. Failure to do so may result in rejection of the material.
e. Provide formed edge returns with a residual core thickness of 0.2 to 0.4mm and seal edges with reinforcements and silicone sealant
f. Structural support must be provided by means other than the return edge.
g. Bonding surfaces shall be chemically pretreated to assure effective and durable bond.
h. Other facing materials may also be suitable and will only be permitted if approved prior to use (General for Building 2017 Edition – Section 16 – Curtain Walls – Composite and Honeycomb Panels – 16.24).

Approved textured high quality finishes comprising an epoxy, silica, acrylic or similar base with an epoxy or polyurethane top coat or coats shall be applied by approved applicators (General for Building 2017 Edition – Section 21 – Painting – High Quality Finishes – 21.88).

Alginate shall be organic, derived from seaweed as soil improver, to be incorporated into the top 300 mm of soil during cultivation, when directed by the SO (General for Building 2017 Edition – Section 25 – Landscape Work – Alginate – 25.02).

Lime wash shall be composed of 15 kg of tallow to 1 m3 of quicklime for walls, ceilings, etc. and 55 kg of tallow to 1 m3 of quicklime for bituminous felted or asphalt roof surfaces (General for Building 2017 Edition – Section 21 – Painting – Limewash – 21.07).

The screen panel assembly shall be capable of carrying a total of load 454 kg minimum (General for Building 2017 Edition – Section 22 – Internal Fittings and Fixtures – Hanging Components – 22.28).

Boulders shall be igneous, sedimentary, or metamorphic rock obtained from a local source, rounded, and with a natural, weathered appearance, free from blasting and drill marks and permanent paint marks, and to the colour and shape as specified. Sizes ranging from a minimum of 750 x 600 x 500mm to a maximum of 3000 x 2500 x 1500mm (General for Building 2017 Edition – Section 25 – Landscape Work – Boulders – 25.04).

The retro-reflectivity of all road markings shall be enhanced by the application of solid glass beads at the rate of 400 to 500 g/m2 (General for Building 2017 Edition – Section 21 – Painting – Reflectorization of Road Marking Materials by Surface Application – 21.73).

The system of safety ropes shall consist of :
i. Vertical ropes at not more than 3m centres horizontally securely anchored to the crest of the slope, and
ii. Horizontal ropes at not more than 3m centres vertically (General for Building 2017 Edition – Section 26 – Geotechnical Works on Soil and Rock Slopes – Inspection Scaffolding – 26.01).

Honeycomb Panels
a. Honeycomb panels shall have a construction method with a minimum in-use history of 15 years and shall have a nominal overall thickness of 25.0 mm
b. Face and back sheets shall generally be aluminium with nominal thickness of 1.0 mm. Alloy shall be of the 3xxx, 5xxx or 6xxx series and shall satisfy structural and finish requirements. Provide formed edge returns and seal edges with silicone sealant. Bonding surfaces shall be chemically pretreated to assure effective and durable bond. Other facing materials may also be suitable and will only be permitted if approved prior to use.
c. Core shall be hexagonal cell aluminium foil with minimum nominal thickness of 0.0762 mm. Cell size shall not exceed 6.0mm measured across flats. Foil shall have an organic corrosion-resistant coating. Alloy shall be 3003, 5052, or 2024.
d. Adhesive shall be a thermal setting modified epoxy with a minimum set temperature of 121ºC. The adhesive shall form a fillet at the perimeter of each cell, and shall continuously bond each cell to the face and back sheets.
e. The face sheet, back sheet, and core of each panel shall be cut from single pieces of material. No joinery shall be permitted unless the size of the panel exceeds the sizes that are commercially available.
f. For panels in place, deviation from flatness of exterior face shall not exceed 2 mm along any straight line which extends from a panel edge to any other edge. Where the edge is concealed, the nearest exposed point to the edge shall be used.
g. Panel exterior face shall be free of visual discontinuities such as ripples, creases, dents, bubbles and blisters, regardless of the measured deviation from flatness at such discontinuities (General for Building 2017 Edition – Section 16 – Curtain Walls – Composite and Honeycomb Panels – 16.24).

The nominal thickness of the screen panels shall be within the range of 38 mm to 50 mm thick overall (General for Building 2017 Edition – Section 22 – Internal Fittings and Fixtures – Screen Panels – 22.27).

A soil nail shall be considered as failed if,
i. It is pulled out before or after the maximum allowable test load Tp as specified in GS Clause 26.42(b) is reached, or
ii. The nail deformation between 6 minutes and 60 minutes at the maximum allowable test load Tp exceeds 2 mm, or
iii. The soil nail head movement has exceeded e f in which ef = Tp L/(EA) + 5mm (General for Building 2017 Edition – Section 26 – Geotechnical Works on Soil and Rock Slopes – Performance Test – 26.42).

Manufactured soil conditioner shall comprise properly composted organic material with the following characteristics:
a. Not capable of raising the temperature of the treated soil more than 5ºC above the temperature of the untreated soil;
b. With a pH value between 6.5 and 7.5
c. With an organic matter content of not less than 85% (dry weight)
d. With a carbon-nitrogen ratio between 20 and 30 (General for Building 2017 Edition – Section 25 – Landscape Work – Manufactured Soil Conditioner – 25.02).

The overall thickness of a completed partition shall not be more than 100 mm (General for Building 2017 Edition – Section 22 – Internal Fittings and Fixtures – Partitions – 22.02).

Green requirements of Varnish and Wax Polish:
a. The products shall not contain the following substances regulated in the Montreal Protocol on Substances that Deplete the Ozone Layer (particularly CFCs, HCFCs, 1,1,1-trichloroethane, and carbon tetrachloride).
b. The product shall contain no more than 0.01% by wet weight of formaldehyde.
c. The product shall contain no more than 0.5% by wet weight of the sum total of aromatic compounds, which must include benzene, toluene, xylenes, and ethylbenzene (General for Building 2017 Edition – Section 21 – Painting – Environmental Green Requirements – 21.90).

Heat treated glass may be rejected, and annealed glass will be rejected, if it does not conform to the following criteria;
a. Shark teeth shall not penetrate more than half of glass thickness.
b. Serration hackle may occur only within 150 mm of corners.
c. Flare shall not exceed 1.0 mm as measured perpendicular to glass surface across the edge. Flare shall not occur at setting blocks.
d. Bevel shall not exceed 1.6 mm.
e. Flake chips may occur only within 200 mm of corners; depth shall not exceed 0.8 mm and length or diameter shall not exceed 6.0 mm.
f. Rough chips shall not be permitted. Rough chips shall be those which exceed any of the dimensional limits for flake chips.
g. Shells on the face of the glass are not permitted on annealed glass and are only acceptable for heat treated glass if they were present prior to heat treatment and are covered by a glazing bead or glass stop. They are not permitted for glass that will be structurally glazed with silicone (General for Building 2017 Edition – Section 20 – Glazing – Edge Quality – 20.01.02).

Copings shall comply with the following:
i. Copings shall comprise of aluminium, minimum 3.0 mm thick or stainless steel, minimum 2.0 mm thick. Unless specified to the contrary in the Particular Specification, the surface finish shall be the same type of finish and colour as the visible external framing.
ii. Copings shall be rigid, reinforced with a metal frame if required and shall be fixed rigidly to the structure. Copings shall be strong enough to resist forces due to typhoon and casual impact.
iii. Ends of coping panels and joints to curtain wall frame shall be tightly sealed up and an effective drainage system shall be provided to drain out any water that may penetrate through the joints (General for Building 2017 Edition – Section 16 – Curtain Walls – Copings – 16.26).