Mandatory Building Inspection Scheme (MBIS) and · PDF file1 Mandatory Building Inspection...

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Mandatory Building Inspection SchemeMandatory Building Inspection Scheme(MBIS)(MBIS)

andandMandatory Window Inspection SchemeMandatory Window Inspection Scheme

(MWIS)(MWIS)

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ContentContent

PurposePurpose

LegislationLegislation

Key Features of MBIS & MWISKey Features of MBIS & MWIS

Duties of Registered InspectorDuties of Registered Inspector

Code of Practice for MBIS and MWISCode of Practice for MBIS and MWIS

Implementation TimetableImplementation Timetable

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PurposePurpose"Prevention is better than cure""Prevention is better than cure"If owners can regularly inspect their buildings, identify problems at an early stage and carry out remedial works timely, accidents can be avoided.

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LegislationLegislation

Buildings (Amendment) Ordinance 2011 [B(A)O 2011] – introducing MBIS & MWIS

Building (Inspection and Repair) Regulation [B(I&R)R] – setting the scopes, standards and procedural requirements for carrying out prescribed building/window inspections and repair

Building (Administration)(Amendment) Regulation 2011 – establishing a new inspectors’register under the BO & stipulating the qualification and experience requirements for RI

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MBISapplies to private buildings* aged 30 years or aboveowners are required to appoint registered inspector (RI)

to carry out prescribed building inspection and supervise prescribed repair in every 10 years

MWISapplies to private buildings* aged 10 years or aboveowners are required to appoint qualified person (QP) to

carry out prescribed window inspection and supervise prescribed repair in every 5 years

Key Features of MBIS and MWISKey Features of MBIS and MWIS

* except domestic building not exceeding 3 storeys in height

B(A)O 2011B(A)O 2011

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Annual Target

2,000 MBIS buildings

5,800 MWIS buildings (of which 2,000 are synchronized with MBIS buildings)

Target buildings to be selected at quarterly intervals


Selection of target buildingsSelection of target buildings

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Registered Inspector (RI)Registered Inspector (RI)A A person whose name is in the person whose name is in the inspectorsinspectors’’ register register under the BO. under the BO. They include:They include:

Authorized PersonsAuthorized Persons

Registered Structural EngineersRegistered Structural Engineers

Registered ArchitectsRegistered Architects

Registered Professional EngineersRegistered Professional Engineers

(Building, Building Services (Building), Civil, Materials (Buil(Building, Building Services (Building), Civil, Materials (Building) & ding) &

Structural) Structural)

Registered Professional SurveyorsRegistered Professional Surveyors(Building Surveying & Quantity Surveying)(Building Surveying & Quantity Surveying)


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Qualified Person (QP)Qualified Person (QP)A person whose name is in one of the registers under the BO. They include:

Authorized Persons’ RegisterStructural Engineers’ RegisterInspectors’ RegisterGeneral Building Contractors’ RegisterMinor Works Contractors’ Register (registered for the class, type and item of minor works in respect of windows)


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Prescribed inspection under MBIS & MWIS covers the following elements of a building:

Common parts

External walls

Projections

Signboards

Windows

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Scope of Prescribed Inspection

Key Features of MBIS and MWISKey Features of MBIS and MWISB(A)O 2011B(A)O 2011

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3

4 5

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Pre-notification letter• 6 months advance notice to all owners of the building

before MBIS Notices

MBIS Notices• 3 months* for appointment of RI• 3 months for completion of building inspection• 6 months for completion of building repair

* extra 3 months will be given for building without OC

Time Frame of MBIS NoticesTime Frame of MBIS Notices

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Pre-notification letter• 1 month advance notice to OC or Management Office or post on

conspicuous part of the building prior to MWIS Notice

MWIS Notices• 3 months* for appointment of QP• 2 months for completion of window inspection• 1 month for completion of window repair

* an extra 3 months will be given for building without OC

Time Frame of MWIS NoticesTime Frame of MWIS Notices

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Duties of Registered Inspector (RI)Duties of Registered Inspector (RI)Carry out the prescribed inspection personally and provide proper supervision of the carrying out of the prescribed repair

Comply with the BO

Notify BA of any case of emergency during the prescribed inspection and prescribed repair

Record any unauthorized building works in the common parts and exterior of the building

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Specifies the technical standards and procedural requirements for the RI and QP to carry out prescribed inspection and to supervise the necessary prescribed repair of buildings and windows

Provides guidance to comply with the requirements of BO and B(I&R)R

The CoP mainly covers:Inspection and AssessmentDetailed InvestigationRectification and RepairSupervision and Control

Code of Practice for MBIS and MWISCode of Practice for MBIS and MWISDraft version of CoPuploaded in BD website in August 2011

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Scope of Inspection Inspection shall cover the following building elements:-

Under MBIS- External elements and other physical elements- Structural elements- Fire safety elements- Drainage systemUnder MWIS- Windows


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Scope of InspectionScope of InspectionExternal elements and other physical elements


ExternalElements

andOther

Physical Elements

- External finishes such as tiling, rendering and cladding

- Fins, grilles, and metal louvers

- Protective barriers, railings, parapets and balustrades

- Fencing and associated fixings

- Curtain wall

- Appendages

- Manually or electrically operated metal gates

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Scope of InspectionScope of InspectionStructural elements


- Columns, walls, beams, slabs, staircases, etc.- Cantilevered projecting structures

- Transfer structures

- Hanging structures

- Other structural elements exposed in the building

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Scope of InspectionScope of Inspection

Fire safety elements


- Means of escape

- Means of access for fire fighting and rescue

- Fire resisting construction

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Scope of InspectionScope of InspectionDrainage system


Drainagesystem

- at external walls of building- in common parts- within common pipe ducts

Underground and above-ground common drainage system

Any other common drainage system for the building under inspection that may, if defective, choked or misconnected, affect the sanitary or hygienic condition of the building

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Inspection and AssessmentInspection and AssessmentStep 1: Pre-inspection preparation- Retrieve all relevant approved/accepted plans, details and

documents to gain a clear understanding of the overall building design and construction including subsequent A&A works.

- Review all available information to determine the design standards and CoPs that were in force when building was constructed and A&A works that had been carried out.

- Formulate an appropriate method statement for the inspection of the building.


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Inspection and AssessmentInspection and Assessment

Step 2: Carrying out of inspection by –- Visual inspection- Hammer-tapping- Infrared thermography- Cover meter survey- Crack width measurement- Opening up of concrete cover at root of cantilevered slab

canopy- Closed circuit television survey (CCTV)


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Inspection and AssessmentInspection and Assessment

Step 3: Assessment and follow up action –- Assess the conditions of elements inspected.

- Make recommendations on the follow-up action based on the inspection findings and professional judgment.

- Provide proposals for the rectification and repair works in the Inspection Report submitted to the BD.


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Code of Practice for MBIS and MWISCode of Practice for MBIS and MWISDetailed Investigation (DI)Detailed Investigation (DI)

RI shall considerconducting an DI where…

Serious defects,abnormal deteriorationconstituting structuralinstability or serious

health hazard

Extent or causeof defect cannot beascertained during

inspection

Seriousstructural

defects

Serious corrosionof main bar at theroot of CSC after

opening up inspection

Uncertainty in Fire Resistance Rating

of Fire ResistingConstruction

Misconnectionof drain pipes

To detect defectiveundergrounddrains/pipes,

source of leakage, etc

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Investigation methods –For condition of concrete:- may be assessed by hammer-tapping, carbonation test, test on chloride and cement content, coring and rebound hammer test, crack survey or other feasible means

For condition of reinforcement:- may be assessed by covermeter survey, measurement of section loss, electrochemical (half-call) potential measurement or other feasible means

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Investigation methods –For structural assessment:- Based on the DI results, evaluate safety level

of the structural elements by determining its Factor of Structural Performance (FSP)

For drainage elements:- Dye test, CCTV survey, smoke or water test, or other

feasible means

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Rectification and Repair (MBIS)Rectification and Repair (MBIS)Code of Practice for MBIS and MWISCode of Practice for MBIS and MWIS

General principles- Based on the inspection findings, the RI shall adopt

the most appropriate repair methods.

- Carry out appropriate proof tests to ensure the standard and quality of the repair works.

- The RI shall ensure that the repair works are carried out to meet the standards stipulated in the BO and B(I&R)R.

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Rectification and Repair (MBIS)Rectification and Repair (MBIS)Code of Practice for MBIS and MWISCode of Practice for MBIS and MWIS

When formulating arepair proposal, the

RI shall considerthe following factors

Intended use anddesign life of structure

Severity of exposure,condition of existing

structure, cause of defect

Impact of repair proposalto the occupants and

public, access to repair

Effects of repair workson building and

environment

Required performanceof repair works, durability

Compatibility of repair materialswith the substrate and the

parent structure

Other aspects relevant to thesafety and health standards

of building under repair

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Inspection and Repair under MWISScope of Inspection:-

General Requirement and Standard of Repair:-- All windows shall remain safe until next cycle of inspection in 5 years- All defective window components shall be replaced- The renewed components shall be of such material or size not inferior

to that of the original design- Windows of specified fire resistance rating shall be maintained after

rectification


Rivets, screws, hinges,sliding tracks, shoes

and window stays

Glass panes,sealant and putty,

window frames

Other elements that QPconsiders may affect

safety of windowunder inspection

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Supervision and Control during Repair:


Adequate measures to ensurea safe working environment

Adequate control on the sequence ofrectification and repair works, theerection and maintenance of scaffolds

Adequate measures to ensure therectification and repair works arecarried out in accordance with theinspection findings & recommendationsof RI/QP

Supervisionand

controlduringrepair

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