topic 1 technical-requirements

7/27/2019 Topic 1 Technical-Requirements

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TECHNICAL REQUIREMENTSS A F E T Y D U R A B I L I T Y E A S E O F M A I N T E N A N C E

C O S T C O N S T R U C T A B I L I T Y A C C E S S I B I L I T Y S E C U R I T Y

BUILDING QUALITY DEPT

Senior Architect Tan Lily


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APRIL 2009 TECHNICAL REQUIREMENT MODULE

OUTLINEOUTLINE

1. Key Considerations

2. Technical requirements3. Regulatory Compliance

4. References


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Key Considerations in Public

Housing Technical Requirements

SAFETYSAFETY

DURABILITYDURABILITY

EASE OF MAINTENANCEEASE OF MAINTENANCE

COSTCOST

ACCESSIBILITYACCESSIBILITY

CONSTRUCTABILITYCONSTRUCTABILITY

SECURITYSECURITY

1


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Technical requirementsA. Safety

1. Measure against killer litter

2. Safety barrier at common areas

3. Safety barrier at roof

B. Designing for maintainabili ty

1. Choice of materials

2. Fabrication method3. Treatment on external facade

4. Access for maintenance at roof

5. Gondola Installation

C. Security1. Unauthorised access


2


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SAFETY

Killer litter

A girl was killed here by flower pot 5 years ago Recently,within a period of 14 days, there are 2 separate incidents where flower pots

dropped to the ground floor

A1


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SAFETY

Killer l itter Potential killerA1

Bldg features that encourage indiscriminate storing on

external in the past


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SAFETY

Measures against killer litter Eliminate any

opportunities for

storing or hanging ofobjects on external

facade

A1

Ledges are kept to minimumwidth and sloped

North south orientation eliminate

the need for sunbreakers


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SAFETY

Measures against killer litter2. Provide safe route for

residents Provide safe

route for

residents

a. Designate block entrancesand provide protectivecanopies.

b. Direct residents towards asafe route.

c. Provide covered walkways.

d. Locate footpaths andoutdoor communal areasaway from openings.

A1


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Designate block entrance and provide protective

canopies


SAFETY

Measures against litter

8Designated block entrancewithout overhead protective cover

Subject

to killer

litter risk

A1

9Designated block entrance withoverhead protective cover


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SAFETY

Measures against litterA1

Using landscaping as

barrier to discourage

residents form walking

below openings

Dispensing withprovision of apron


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SAFETY

Safety Barrier at common areas Height of safety barrier


1.25m

A2HDBs requirement

Height of safety barrier to common

areas* is 1.25m for added child safety.

*lift lobbies, common corridors, roofgardens and other areas accessible by

general public


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SAFETY / EASE OF MAINTENANCE

Safety barrier at main roof Provide 1m high safety barrier

Along perimeter of main roof ( new)

Along maintenance route where theres no roof fascia( forexisting)

Roof safety Railing is recommended Maintenance route

A3


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EASE OF MAINTENANCE/ SAFETY

Safety barrier at main roof Simple and durable design( extg)

Height - not lessthan 1000mm

measured from

secondary roof level

Gap -not

more than

300mm

Spacing - not

more than

1200mm

Simple and modular design

Material

Galvanised steel

with anti-rust paint

system

A3

Narrow Access

Obstruction byservices


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Designing for Maintainability Considerations

Durable

In material and construction

long life expectancy

able to withstand rough usage

Ease of construction Ease of maintenance

Minimum maintenance

Easy to inspect and maintain

Access for maintenance

Low operating, repair, replacement & maintenance

cost

Easily available

B1


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DURABILITY

Choice of material Glass shall not be used as roofing material or safety

barrierB1


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DURABILITY

Fabrication of components

27

Use precast elements and factory prefabrication. Rely

less on workmanship on site

B2


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APRIL 2009 TECHNICAL REQUIREMENT MODULE`

DURABILITY

Fabrication of components Rely less on workmanship on site

Misaligned hole

Missing bolts

Bolts not tightened

Panel loosened

Missing base plate

B2


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DURABILITY

Fabrication of components Corner windows

9Use corner mull ion for amore robust joint.

8Avoid use of sealant jointfor corner windows. Sealant

deteriorates over time and is

likely to cause maintenance

problem and create undue

inconveniences to lessees.

B2


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SAFETY / EASE OF MAINTENANCE/ COST/

External facade Avoid

External plastering

Brick-cladding

In-situ tiling to faade walls

Other form of cladding or

attachments at heights

Safety risk due to fallingpanel

Costly repair

Difficult to inspect and

maintain


B3

Cladding panel dislodged

Brick cladding dislodged


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SAFETY / EASE OF MAINTENANCE/ COST

Roof Metal or clay roof shall NOT be used above 2nd storey of any

HDB residential buildings.


B3

Blown away roof

Part of roof panel dislodged


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Provide at least

ONE staircase

access to the

main roof.

EASE OF MAINTENANCE

Access for maintenance - roof

POINTS TO NOTE:Provision of access for maintenance purpose

a. at least one staircase access to the main roof

b. staircase access from main roof to the lift machine room

B4


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Primary roof

POINTS TO NOTE:

1. Provide min 1.8mheadroom below

water tank for

maintenance of

pipes.

2. Provide access

platform to water

tanks.3. Provide roof over

booster pump room.


Access for maintenance - roof3

min1.8m

12

B4


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Access for maintenance - roof1

23

Access platform to water

tank

B4


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EASE OF MAINTENANCE

Installation of gondola Ensure all roofs, water tanks,

features and every part of

external faade is accessible formaintenance.

Gondola is the MAIN means of

access for maintenance of

external faade.

Design for installation of

gondola

Ensure no obstructions

Adequate space

B5


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EASE OF MAINTENANCE

Installation of gondola Obstruction to installation of gondolaB5

Metal roof projects 3 m from building

edge, not accessible from roof or by

gondola for maintenance and repair

Cantilevered roof obstructs

the hanging of maintenance

gondola


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SECURITY

Linkway connection

Roof of covered walkway provided possible unauthorised access to residential unit.

Although window are at high level, resident felt insecure. Grilles had to be installed at

MSCP opening.

Opening at MSCP

Ensure linkway do not connect below opening of

residential unitsC1


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SECURITY

External ledge Take care possible unauthorised access from lift lobby

Provide grille with lock at lift lobby

to prevent unauthorised access to

CRC roof ( maintenance access is

still required).

C1


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SECURITY

Features Ensure external features does not facilitate

unauthorised access to units aboveC1


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Regulatory Compliance

Submission to authorities as as per private projects.

Need to submit to HDB thru CORENET.

Resolve regulatory compliance issues early prior tolaunch or exhibition

Avoid mechanical system as means of compliance MSCP should be designed without need for sprinkler or mechanical

ventilation system

All escape staircases & lobbies should be naturally ventilated

Optimum compliance

3


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References

1. HDB standard specifications

2. HDB Guide Drawings

3. Town Councils publication -

Design for Maintainability

4


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THANK YOU


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SAFETY

Measures against litterA1

topic 1 technical-requirements

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