HKIA Exam Paper 6 Quiz 54

The suspension system shall be manufactured from one of the following materials
i. Galvanized mild steel
ii. Aluminium
iii. A combination of galvanized mild steel and aluminium (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Proprietary Suspended Ceiling Systems – 13.23).

The top of vertical mastic asphalt shall be tucked into a chase not less than 25 x 25 mm unless the mastic asphalt is being continued horizontally (General for Building 2017 Edition – Section 11 – Tanking – Laying of Mastic Asphalt – 11.10).

Wall ties in masonry which is to face an existing or newly constructed wall shall be fixed at a rate of 5 per square meter (General for Building 2017 Edition – Section 10 – Masonry – Walling built Against Concrete – 10.23).

Heavyweight construction gives better performance than lightweight construction because it resists the passage of heat (Code of Practice for Overall Thermal Transfer Value in Buildings 1995 – 7 – Calculation of Components Coefficients and Parameters of Overall Thermal Transfer Value – Equivalent Temperature Difference for Walls – 7.4).

Fittings shall be finished as follows:
a. Stainless steel
b. Satin anodized aluminium
c. Chromium-plated brass (General for Building 2017 Edition – Section 14 – Ironmongery – Finishes – 14.101).

Nails for fixing felt to timber decks shall be galvanized steel or non-ferrous metal with 3 mm diameter shank and 11 mm diameter clout head and 20 mm long (General for Building 2017 Edition – Section 12 – Roofing – Nails – 12.13).

The density of hardwood shall be 720 kg/m3 (minimum) at 15% moisture content (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Hardwood – 13.06).

On horizontal surfaces, mastic asphalt shall be laid in three coats to a total thickness of 30 mm. On vertical surfaces, mastic asphalt shall be applied in three coats to a total thickness of not less than 20 mm, taken to a height of at least 150 mm above ground level. An angle fillet not less than 50 mm wide shall be applied in two coats at the junction of two planes forming an internal angle (General for Building 2017 Edition – Section 11 – Tanking – Laying of Mastic Asphalt – 11.10).

The absorptivity of Bituminous felt is 0.88
(Code of Practice for Overall Thermal Transfer Value in Buildings 1995 – Table 4)

Door closing devices shall be designed to allow exterior and interior doors to be opened with forces of not more than 30N and 22N respectively (General for Building 2017 Edition – Section 14 – Ironmongery – Barrier Free Access – 14.49).

Avoid contact in the completed work between the following metals:
a. Aluminium alloys and copper alloys, nickel, lead or stainless steel.
b. Iron or steel and copper alloys.
c. Zinc (including galvanizing) and copper alloys or nickel (General for Building 2017 Edition – Section 12 – Roofing – Contact of Dissimilar Metals – 12.07).

Maintenance cleaning of stones shall be done by means of:
a. Washing
b. Abrasive blasting
c. Mechanical
d. Chemical (General for Building 2017 Edition – Section 10 – Masonry – Walling built Against Concrete – 10.23).

The dry mass shall be determined by drying in an oven at a temperature of 103ºC ± 2ºC until the weight is constant (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Moisture Content – 13.03).

The minimum diameter and the minimum depth of the head of a headed stud shall be 1.5d and 0.4d respectively, where d is the nominal shank diameter of the stud (General for Building 2017 Edition – Section 15 – Structural Steel Work – Shear Studs – 15.10).

The Overall Thermal Transfer Value of the roof of a building tower or a podium, should be calculated using the following
Area of the opaque roof, m2
Thermal Transmittance of the opaque roof, W/m2
Absorptivity of the opaque roof
Equivalent temperature difference for the roof, degree Celcius
Area of fenestration in roof m2
Shading coefficient of fenestration in roof
The solar factor for the vertical surface W/m2
Gross area of the roof (Code of Practice for Overall Thermal Transfer Value in Buildings 1995 – 6 – Overall Thermal Transfer Value of Roofs).

Underlayer to consist of one or more layers, as specified, of approved fine granule surface felt (nominal weight 1.8 or 2.5 kg/m2).
Top layer shall be one of the following:
a. Approved mineral surfaced felt, (nominal weight 2.8 kg/m2)
b. Approved fine granual surfaced felt (nominal weight 2.5 kg/m2) with surface dressing (General for Building 2017 Edition – Section 12 – Roofing – Bitumen felt – 12.08).

Liquid applied, elastomeric waterproofing shall be made of a pitch modified polyurethane, and shall be submitted for approval by the SO. The membrane shall be capable of elongation of not less than 400% to accommodate cracks up to 2mm without losing its waterproofing properties, and its tensile strength shall exceed 1.6 N/mm², and the tear resistance and adhesion strength shall not be less than 12 N/mm and 2.6 N/mm respectively at site condition unless otherwise approved by the SO (General for Building 2017 Edition – Section 11 – Tanking – Liquid Applied Membrane – 11.04.02).

Squared coursed rubble – Trim stones roughly square as (b), but to suit courses of regular height varying from 150 mm to 250 mm (General for Building 2017 Edition – Section 10 – Masonry – Preparation of Stone for Rubble Stone Walling – 10.10).

The maximum permissible moisture content in timber to be incorporated into the work shall be as follows:
a. Internal timber for use in Air Conditioned space 12%
b. Internal timber generally 16%
c. Timber with one face to the exterior of the building and one face to the interior (e.g. window frames) 18%
d. External timber (e.g. fencing etc.) 20% (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Moisture Content – 13.03).

Hinges shall be countersunk drilled, fixed with matching screws and of the following types;
For pressed steel doors and frames: ANSI template drilled with M5 or M6 x 12.5mm machine threaded screws (General for Building 2017 Edition – Section 14 – Ironmongery – Hinges and Pivots – 14.24).

The thermal conductivity (k), Watts per Metre degree Celcius of Gypsum is 0.38
(Code of Practice for Overall Thermal Transfer Value in Buildings 1995 – Table 1)

Flashings shall be let into walls a minimum of 25 mm, provided with a turn back, secured with folded aluminium wedges and pointed in cement mortar (General for Building 2017 Edition – Section 12 – Roofing – Aluminium – 12.06).

Joints in successive coats of mastic asphalt shall be staggered at least 150 mm for horizontal work and 75 mm for vertical work (General for Building 2017 Edition – Section 11 – Tanking – Laying of Mastic Asphalt – 11.10).

Types of Rubble Walling are;
a. Random Rubble
b. Squared Uncoursed Rubble
c. Squared Coursed Rubble
d. Squared Rubble brought up to courses
e. Squared Rubble Walls Sections (General for Building 2017 Edition – Section 10 – Masonry – Walling built Against Concrete – 10.24).

Glass fibre insulating quilt shall be light-weight bonded mat weighing 12 kg/m3 uncompressed (General for Building 2017 Edition – Section 13 – Carpentry and Joinery – Glass Fibre – 13.18).

Proprietary shear studs for composite construction shall be the headed type and shall be in accordance with BS EN ISO 13918 with the following minimum properties after being formed:
i. Yield strength 350 MPa;
ii. Ultimate tensile strength 450 MPa; and
iii. Elongation of 15% on a gauge length of 5.65√Ao, where Ao is the original cross-section area of the test specimen.
(General for Building 2017 Edition – Section 15 – Structural Steel Work – Shear Studs – 15.10).

The equivalent temperature difference for wall should take into account the wall mass, density and orientation (Code of Practice for Overall Thermal Transfer Value in Buildings 1995 – 7 – Calculation of Components Coefficients and Parameters of Overall Thermal Transfer Value – Equivalent Temperature Difference for Walls – 7.4).

Random rubble – Stones shall be irregularly shaped roughly cut 75 mm to 300 mm high, and 75 mm (minimum) deep and 75 mm to 600 mm long on bed. The length or depth on bed of each stone shall be greater than the height (General for Building 2017 Edition – Section 10 – Masonry – Preparation of Stone for Rubble Stone Walling – 10.10).

Proprietary flexible sheet membrane shall be capable of accommodating unanticipated cracks of up to 0.6 mm wide without losing its waterproofing properties, and the properties of the membrane in lap shear and lap peel shall not be less than 110 kN/m2 and 3.3 kN/m respectively at site condition unless otherwise approved by the SO (General for Building 2017 Edition – Section 11 – Tanking – Proprietary Flexible Sheet Membrane – 11.04.01).

Flashings shall be let into walls a minimum of 25 mm, secured with lead wedges and pointed in cement mortar. Flashing shall be lapped a minimum of 100 mm and the lower edge secured with lead tacks at 750 mm centres (General for Building 2017 Edition – Section 12 – Roofing – Lead – 12.04).