standards for housing design and construction

STANDARDS FOR HOUSINGSTANDARDS FOR HOUSINGDESIGNAND CONSTRUCTIONDESIGNAND CONSTRUCTIONRelevance/Applicability in View of “New Normal”

A presentationby Ar. Maria Benita O. Regala. fuap

Manager, Housing Technology Development Office (HTDO), NHA

to the Technical Workshop on Holistic Solutions for Resilient Low-Cost Housingat The Oracle Hotel, Quezon City

on 03 April 2014

OUTLINE OF PRESENTATION

• Standards from BP 220• Site Selection Criteria and Planning Principles

being applied for NHA Projects• 22 m² Row House Model with 11 m² Loft

developed as a disaster-resilient housing

• Standards from BP 220• Site Selection Criteria and Planning Principles

being applied for NHA Projects• 22 m² Row House Model with 11 m² Loft

developed as a disaster-resilient housing

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BP 220 Standards

A. Site Criteria (Sec. 5, BP 220)

1. Availability of Basic Needs (Water, Movementand Circulation, Storm Drainage, Solid and LiquidWaste Disposal, Parks/Playground, Power)

2. Conformity with Zoning Ordinances/ City orMunicipality Land Use Plan

3. Physical Suitability4. Accessibility

A. Site Criteria (Sec. 5, BP 220)

1. Availability of Basic Needs (Water, Movementand Circulation, Storm Drainage, Solid and LiquidWaste Disposal, Parks/Playground, Power)

2. Conformity with Zoning Ordinances/ City orMunicipality Land Use Plan

3. Physical Suitability4. Accessibility

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BP 220 Standards

B. Planning Considerations (Sec. 5, BP 220)

1. Area Planning2. Site Preservation/ Alteration

a. Slopeb. Preservation of Site Assetsc. Ground Cover

3. Easements4. Circulation

B. Planning Considerations (Sec. 5, BP 220)

1. Area Planning2. Site Preservation/ Alteration

a. Slopeb. Preservation of Site Assetsc. Ground Cover

3. Easements4. Circulation

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BP 220 Standards

B. Design Parameters (Sec. 5, BP 220)

1. Land Allocation2. Lot Requirement3. Length of Block4. Shelter Component5. Setback/ Yard6. Water Supply7. Electrical Power Supply

B. Design Parameters (Sec. 5, BP 220)

1. Land Allocation2. Lot Requirement3. Length of Block4. Shelter Component5. Setback/ Yard6. Water Supply7. Electrical Power Supply

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8.Sewage Disposal System9. Drainage Disposal System10. Garbage Disposal System11. Firefighting

SITE SELECTION CRITERIA

• LOCATION– With consideration of both the regional and local

context– Housing projects shall be within suitable sites for

housing and outside potential hazard prone andprotection areas

• ACCESSIBILITY FROM MAJOR TRANSPORTATIONFACILITIES– Site shall have an existing legal road right of way from

a major thoroughfare

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• LOCATION– With consideration of both the regional and local

context– Housing projects shall be within suitable sites for

housing and outside potential hazard prone andprotection areas

• ACCESSIBILITY FROM MAJOR TRANSPORTATIONFACILITIES– Site shall have an existing legal road right of way from

a major thoroughfare


• ZONING AND LAND USE CLASSIFICATION– Classification shall be Residential as defined under

approved CLUP

• TOPOGRAPHY AND SOIL CHARACTERISTICS– Must be relatively flat (or filling requirement for

rolling terrain shall not exceed max cost)– Slopes should not exceed 15% max gradient. For high

density, slope should be below 5%.– Soil characteristics must conform to the suitability

standards for construction by DENR through itsBureau of Mines and Geo-Sciences

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• ZONING AND LAND USE CLASSIFICATION– Classification shall be Residential as defined under

approved CLUP

• TOPOGRAPHY AND SOIL CHARACTERISTICS– Must be relatively flat (or filling requirement for

rolling terrain shall not exceed max cost)– Slopes should not exceed 15% max gradient. For high

density, slope should be below 5%.– Soil characteristics must conform to the suitability

standards for construction by DENR through itsBureau of Mines and Geo-Sciences


• WATER SUPPLY FACILITIES– Source of potable water should be established

whether from local water company, from the ground,or other alternative source

• POWER SUPPLY FACILITIES– Presence of power utility company that will serve the

needs of new community

• DRAINAGE– Natural waterways and outfalls shall be established on

ground8

• WATER SUPPLY FACILITIES– Source of potable water should be established

whether from local water company, from the ground,or other alternative source

• POWER SUPPLY FACILITIES– Presence of power utility company that will serve the

needs of new community

• DRAINAGE– Natural waterways and outfalls shall be established on

ground

SITE PLANNING PRINCIPLES

• Compliance to all existing laws, rules andregulations on housing (local or national)

• Adoption of the green infrastructure andpreservation of existing natural assets of the land(e.g., trees, ground cover, vegetation, naturalwaterways)

• Promotion of “walkable communities”

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• Compliance to all existing laws, rules andregulations on housing (local or national)

• Adoption of the green infrastructure andpreservation of existing natural assets of the land(e.g., trees, ground cover, vegetation, naturalwaterways)

• Promotion of “walkable communities”


• Promotion of appropriate community facilitiesand infrastructure– To serve the socio-economic needs and cultural

activities of the beneficiaries as well as encouragethe implementation of environmentalmanagement programs in the housing sites

– NHA shall provide the minimum requirements forcommunity facilities

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• Promotion of appropriate community facilitiesand infrastructure– To serve the socio-economic needs and cultural

activities of the beneficiaries as well as encouragethe implementation of environmentalmanagement programs in the housing sites

– NHA shall provide the minimum requirements forcommunity facilities


• LAND USE ALLOCATION PER SITE66% Saleable

– Residential housing development

34% Non-Saleable– Circulation/ Road Network– Parks and Playgrounds– Community Facilities

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• MAXIMUM ALLOWABLE DENSITY PER HECTARE– Horizontal Development

• 1-Storey Row House (Loftable) : 160 units/ha.• 1-Storey Row House (with loft) : 160 units/ha.• 2-Storey Row House : 160 units/ha.

– Vertical Development (Low Rise Buildings)• 2-Storey LRB : 225 units/ha.• 3-Storey LRB : 245 units/ha.• 4-Storey LRB : 325 units/ha.• 5-Storey LRB : 405 units/ha.

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• MAXIMUM ALLOWABLE DENSITY PER HECTARE– Horizontal Development

• 1-Storey Row House (Loftable) : 160 units/ha.• 1-Storey Row House (with loft) : 160 units/ha.• 2-Storey Row House : 160 units/ha.

– Vertical Development (Low Rise Buildings)• 2-Storey LRB : 225 units/ha.• 3-Storey LRB : 245 units/ha.• 4-Storey LRB : 325 units/ha.• 5-Storey LRB : 405 units/ha.

HOUSING UNIT DESIGN GUIDELINES

• MINIMUM FLOOR AREA– 22.0 square meters loftable– 22.0 square meters with 11 sq.m loft– 24.0 square meters (for LRBs)

– Models for lots along major roads may be modified toinclude provision of a space for home-based economicactivity, but should not exceed cost parameters

– If new technology or material substitute: must havepassed AITECH (Accreditation of InnovativeTechnologies for Housing)

HIGHER THANBP 220 MINIMUM

HIGHER THANBP 220 MINIMUM

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• MINIMUM FLOOR AREA– 22.0 square meters loftable– 22.0 square meters with 11 sq.m loft– 24.0 square meters (for LRBs)

– Models for lots along major roads may be modified toinclude provision of a space for home-based economicactivity, but should not exceed cost parameters

– If new technology or material substitute: must havepassed AITECH (Accreditation of InnovativeTechnologies for Housing)

STANDARDS FOR COMMUNITY FACILITIES

• Provision of community facilities shall bedetermined based on the needs of targetbeneficiaries– Based on existence of public infrastructure within the

5-km radius of the site

• For horizontal development:– 1 covered basketball court/ multi-purpose center– 1 day care center w/ 2 classrooms– 1 MRF– 1 tricycle terminal

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• Provision of community facilities shall bedetermined based on the needs of targetbeneficiaries– Based on existence of public infrastructure within the

5-km radius of the site

• For horizontal development:– 1 covered basketball court/ multi-purpose center– 1 day care center w/ 2 classrooms– 1 MRF– 1 tricycle terminal

OTHER FACTORS IN PROJECT PLANNINGFactors that Help Ensure Effective Project Planningand Management for Disaster Resilient Homes:

Local Inter-Agency Committeewith POs and NGOs organized atthe start of the project


A Planning Team and a ProjectManagement Composite Team wereset up by NHA


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Securing of all EnvironmentalClearances and Permits prior toconstruction:*ECC from DENR*Clearance from PHIVOLCS*Dev’t/ Building Permit from LGUs

Securing of all EnvironmentalClearances and Permits prior toconstruction:*ECC from DENR*Clearance from PHIVOLCS*Dev’t/ Building Permit from LGUs


Community Representatives weremade part of project monitoringduring and after construction

Community Representatives weremade part of project monitoringduring and after construction

Individual beneficiaries accepttheir housing units prior topayment to Contractors

Individual beneficiaries accepttheir housing units prior topayment to Contractors

22 SQ. M. ROW HOUSE MODEL FOR TYPHOON22 SQ. M. ROW HOUSE MODEL FOR TYPHOONYOLANDA VICTIMSYOLANDA VICTIMS (WITH 11 SQ. M. LOFT)(WITH 11 SQ. M. LOFT)

LOT SIZE:40 sq. m.

(10.00m x 4.00m)

BUILDINGFOOTPRINT:

22 sq. m.(5.50m x 4.00m)

TOTAL FLOOR AREA: 33 sq. m.(GROUND FLOOR AND LOFT)

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REVISED 06 MAR 2014

LOT SIZE:40 sq. m.

(10.00m x 4.00m)

BUILDINGFOOTPRINT:

22 sq. m.(5.50m x 4.00m)

TOTAL FLOOR AREA: 33 sq. m.(GROUND FLOOR AND LOFT)

DISASTER RESILIENT HOUSING STRUCTURAL DESIGN STANDARDS

DESIGN PARAMETER ONE-STOREY TWO- STOREY 3-STOREYS ORMORE

WIND LOAD 250 KPH 250 KPH 250 KPH

STRENGTH OF WALLANDSUPERSTRUCTURE

3,000 PSI 3,000 PSI 3,000 PSI


STRENGTH OF WALLANDSUPERSTRUCTURE

SOIL BEARINGCAPACITY

95 KPA 95 KPA 95 KPA

SEISMIC LOAD ZONE 4 ZONE 4 ZONE 4

LOADINGS 50 PSF 50 PSF 50 PSF

FIRE RESISTANCE 2 HOURS 2 HOURS 2 HOURS

This is one of the outputs generated from the consultation meetings of theNHA TWG on Disaster-Resilient Housing in November to December 2013.

PROPOSED LOT SIZE:40 sq. m. (10.00m x 4.00m)


SITE DEVELOPMENT PLAN

GROUND FLOOR AREA22 sq. m. (5.50m x 4.00m)


GROUND FLOOR PLAN

LOFT FLOOR AREA11 sq. m. (2.75m x 4.00m)


LOFT FLOOR PLAN


CROSS SECTION


LONGITUDINAL SECTION


FRONT ELEVATION


REAR ELEVATION


TYPHOON SHUTTER DETAILSFRONT ELEVATION


TYPHOON SHUTTER DETAILSSECTION

SIDEELEVATION


TYPHOON SHUTTER DETAILSWINDOW SILL DETAILS


CONCRETE GUTTER DETAIL


INCLINED ROOF BEAM DETAILS


PURLIN EMBEDMENT DETAILS


ROOFING SHEETSOVERLAP DETAIL

OUTLINE SPECIFICATIONSSTRUCTURAL : RC BEAM, COLUMN & FOOTINGRC WALL FOOTINGRC FLOOR SLAB, 100MM thk. WITH 10mmØRSB @ 400mm BOTHWAYSWALLS : 150mm thk. CHB (FIREWALL)

100mm thk. CHB, PLASTER FINISH (EXTERIOR)100mm thk. CHB, TOOL JOINT FINISH (INTERIOR)

ROOFING : 0.404mm thk CORR. G.I. ROOFING SHEETS at 8’2.0mm X 50mm X 150mm C-PURLINS WITH12mmØ SAGROD @ MIDPOINT

DOORS(OPTIONAL) : 1 – FLUSH DOOR TYPE1 – PANEL DOOR TYPE1 – PVC DOOR TYPEWINDOWS (OPTIONAL) : ALUMINUM JALOUSIE TYPE with TYPHOON SHUTTERS

: 4” x 8” x 8” CONCRETE LOUVER BLOCKSFINISHES : EXTERIOR WALL – PLASTERED AND PAINTED FINISH

T & B FLOOR – 200mm X 200mm FLOOR TILESPLUMBING : WATER LINE – uPVC PIPES

SANITARY & DRAINAGE LINES – PVC PIPESTOILET BOWL – PAIL FLUSH TYPE LAVATORY

SEPTIC TANK : PURIFYING POLYTHYLENE SEPTIC TANK


OUTLINE SPECIFICATIONSSTRUCTURAL : RC BEAM, COLUMN & FOOTINGRC WALL FOOTINGRC FLOOR SLAB, 100MM thk. WITH 10mmØRSB @ 400mm BOTHWAYSWALLS : 150mm thk. CHB (FIREWALL)

100mm thk. CHB, PLASTER FINISH (EXTERIOR)100mm thk. CHB, TOOL JOINT FINISH (INTERIOR)

ROOFING : 0.404mm thk CORR. G.I. ROOFING SHEETS at 8’2.0mm X 50mm X 150mm C-PURLINS WITH12mmØ SAGROD @ MIDPOINT

DOORS(OPTIONAL) : 1 – FLUSH DOOR TYPE1 – PANEL DOOR TYPE1 – PVC DOOR TYPEWINDOWS (OPTIONAL) : ALUMINUM JALOUSIE TYPE with TYPHOON SHUTTERS

: 4” x 8” x 8” CONCRETE LOUVER BLOCKSFINISHES : EXTERIOR WALL – PLASTERED AND PAINTED FINISH

T & B FLOOR – 200mm X 200mm FLOOR TILESPLUMBING : WATER LINE – uPVC PIPES

SANITARY & DRAINAGE LINES – PVC PIPESTOILET BOWL – PAIL FLUSH TYPE LAVATORY

SEPTIC TANK : PURIFYING POLYTHYLENE SEPTIC TANK


STRUCTURAL DRAWINGS

INCREASE BEAM WIDTH FROM 150mmto 175mm

INCREASE SIZE OF REINFORCING STEELBARS FROM 12 mm ø

TO 16 mm ø DIAMETER

DPWH COMMENTS AND RECOMMENDATIONS


STRUCTURAL DRAWINGS

INCREASE COLUMN WIDTH FROM150mmto 175mm

INCREASE SIZE OF LOFT WOODEN FLOORJOISTS FROM 2” x 3” to 2” x 6”



STRUCTURAL DRAWINGS

CHANGE ROOFING SCREWS FROMTEKSCREW TO J-BOLT



ARCHITECTURAL DRAWINGS

REVISED STAIR RISER HEIGHT TOACCOMMODATE LARGER FLOOR JOIST

AND BEAM

INCREASE FLOOR TO FLOOR HEIGHT TOACCOMMODATE LARGER FLOOR JOISTAND BEAM (FROM 5.30M TO 5.50M)

COMPARATIVE ANALYSIS

22 sq.m.LOFTABLEROWHOUSE

22 sq.m.ROWHOUSEWITH LOFT

COST Php 125,000.00 Php 219,723.63TOTAL FLOOR AREA 22sq.m. 33 sq.m.

(22 sq.m. G/F AREAand 11 sq.m. LOFT)


COST Php 125,000.00 Php 219,723.63TOTAL FLOOR AREA 22sq.m. 33 sq.m.

(22 sq.m. G/F AREAand 11 sq.m. LOFT)

COST PER SQ. M. Php 5,681.81 Php 6,658.29

22 sq.m. LOFTABLEROWHOUSE

22 sq.m. ROWHOUSEWITH LOFT

ARCHITECTURAL

Architectural Features Structural Provisionfor Loft and Stairs

Loft, Stairs, WoodenTyphoon Shutters



Structural Provisionfor Loft and Stairs

Loft, Stairs, WoodenTyphoon Shutters

G/F Floor to LoftFloor Finish Height

2.40 meters 2.60 meters

Gutter No Gutter andDownspout

Concrete Gutter(3 inches thick) andDownspout

Height of Firewall 4.80 meters 5.80 meters

Roof Thickness 0.30millimetersthk.Corrugated GI Sheet

0.40millimetersthk.Corrugated GI Sheet

Roof Purlins 1.2 x 100 x 50 mm 2.0 x 150 x 65mm



STRUCTURAL

Column Size 200 x 150 mm, with4-12 mm ø reinforcingbar

250 x 175 mm, with4-16 mm ø reinforcingbar





Beam Size B-1: 250 x 150 mm,with 4-12 mm øreinforcing bar

B-1 and B-3:300 x 175 mm andB-2: 250 x 175 mm,with4-16 mm ø reinforcingbar

Footing Size 400 x 400 mm 800 x 800 mm

Wall Footing Size 300 mm 400 mm



ELECTRICAL

Number of LightingOutlets

3 4



Number of LightingOutlets

Number ofConvenience Outlets

3 4

Number of Switches 2 2

Service Entrance 2-5.5 mm² ø THW +1-3.5 mm² ø TW in 20mm ø PVC CONDUIT

2-5.5 mm² ø THHN +1-5.5 mm² ø THHN(G) in 20 mm ø RSCCONDUIT

DESCRIPTIONMATERIAL

COSTLABOR COST

ESTIMATEDDIRECT COST

TOTAL INDIRECTCOST

TOTAL COST

I. EARTHWORKS

SUB-TOTAL 2,418.00 1,943.63 4,361.63 610.63 4,972.25

II. CONCRETE/STRUCTURAL WORKS

SUB-TOTAL 65,420.75 19,135.65 84,556.41 11,837.90 96,394.30

III. FORMWORKS

SUB-TOTAL 3,460.00 720.78 4,180.78 585.31 4,766.09

IV. ROOFING WORKS

SUB-TOTAL 16,105.00 3,952.28 20,057.28 2,808.02 22,865.30


SUB-TOTAL 16,105.00 3,952.28 20,057.28 2,808.02 22,865.30

V. DOORS AND JAMBS

SUB-TOTAL 13,000.00 1,741.89 14,741.89 2,063.86 16,805.75

VI. WINDOWS

SUB-TOTAL 7,008.00 1,321.43 8,329.43 1,166.12 9,495.55

VII. PLUMBING WORKS

SUB-TOTAL 14,557.32 4,805.39 19,362.70 2,710.78 22,073.48

VIII. ELECTRICAL WORKS

SUB-TOTAL 12,881.00 4,127.43 17,008.43 2,381.18 19,389.61

IX. ARCHITECTURAL WORKS

SUB-TOTAL 17,880.74 2,260.76 20,141.49 2,819.81 22,961.30

TOTAL 152,730.81 40,009.22 192,740.02 26,983.60 219,723.63

• THE DPWH APPROVAL OF THE PLAN IS BASED ONTHE REVIEW OF DESIGN CONCEPT AND DESIGNANALYSIS SUBMITTED BY NHA.

• CLOSE SUPERVISION DURING CONSTRUCTIONSHOULD BE UNDERTAKEN BY NHA TO ENSURECOMPLIANCE TO THE APPROVED PLANS.

• SUFFICIENT TESTING OF MATERIALS SHOULD BECONDUCTED TO VERIFY COMPLIANCE TO STANDARDDPWH STANDARDS.

DPWH NOTES


• THE DPWH APPROVAL OF THE PLAN IS BASED ONTHE REVIEW OF DESIGN CONCEPT AND DESIGNANALYSIS SUBMITTED BY NHA.

• CLOSE SUPERVISION DURING CONSTRUCTIONSHOULD BE UNDERTAKEN BY NHA TO ENSURECOMPLIANCE TO THE APPROVED PLANS.

• SUFFICIENT TESTING OF MATERIALS SHOULD BECONDUCTED TO VERIFY COMPLIANCE TO STANDARDDPWH STANDARDS.

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