120 M² Single-story Residential House 3 Bedrooms

Below is a complete architectural and material package for a 120 m² single-story residential house, designed for tropical and seismic-prone regions such as the Philippines, Chile, and Papua New Guinea. The design includes 3 bedrooms, 2 bathrooms, an open-plan kitchen and living room, and uses a light-gauge steel (LGS) framing system with specified wall, roof, and insulation layers.

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Key Features

Total floor area: 120 m² (approx. 1,292 ft²)

Layout: Single-story, rectangular footprint for structural efficiency and cyclone/seismic resilience

Orientation: Optimized for cross-ventilation and natural daylight

Roof pitch: 15° (suitable for rain runoff in tropical climates)

Ceiling height: 2.7 m (8'10")

Exterior walls: Cement fiber cladding + LGS + insulation

Interior walls: Double-sided gypsum on LGS with insulation

Roof: Corrugated metal (color-coated steel) over insulated LGS trusses

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Below is a clear and organized table summarizing the materials, specifications, quantities, and units for the 120 m² single-story light steel framed house designed for tropical and seismic regions (Philippines, Chile, Papua New Guinea).

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Material Takeoff & Quantity Schedule

No.	Material / Component	Specification / Description	Unit	Quantity	Notes
1	Cement fiber exterior siding	10 mm thick, pre-finished, lap siding	m²	100	Includes 5% waste
2	OSB sheathing (walls)	12 mm thick, structural grade	m²	100	For exterior walls
3	OSB roof deck	15 mm thick	m²	130	Sloped roof area + 5% waste
4	Wall breathable membrane (WRB)	Vapor-permeable, water-resistant (e.g., Tyvek-type)	m²	100	Applied over OSB on walls
5	Roof underlayment	UV-resistant, vapor-permeable roofing membrane	m²	130	Under metal roofing
6	Light-gauge steel studs (walls)	92 mm depth, 0.55 mm base metal thickness (BMT), C-section	linear m	320	Exterior + interior partitions
7	Light-gauge steel roof trusses & purlins	Truss depth: 200–250 mm; BMT: 0.75 mm; spaced @ 600 mm o.c.	kg	2,800	Approx. 22–25 kg/m² of roof
8	Glass wool insulation (walls)	150 mm thick, density ≥32 kg/m³, R-13	m³	16.5	Fills wall cavities (94 m² × 0.09 m)
9	Glass wool insulation (roof)	150 mm thick, R-19	m³	18.6	Between roof trusses (124.2 m² × 0.15 m)
10	Gypsum board (interior finish)	12.5 mm thick, standard (MR type in bathrooms)	m²	350	Walls (both sides) + ceiling + 10% waste
11	Corrugated color-coated steel roofing	0.5 mm thick, anti-corrosion coating (e.g., AZ150 or Z275)	m²	130	Includes ridge, eaves, fasteners allowance
12	Operable windows	Aluminum frame, 1.2 m × 1.2 m, with insect screen	unit	3	One per bedroom
13	Interior doors	Solid core, 0.8 m × 2.1 m (bedrooms); 0.75 m × 2.1 m (bathrooms)	unit	5	3 bedroom + 2 bathroom
14	Main entrance door	Solid core, weather-sealed, 0.9 m × 2.1 m	unit	1	Front entry
15	Sliding glass door	Aluminum-framed, double-glazed optional, 2.4 m × 2.1 m	unit	1	Opens to outdoor living area
16	Fasteners, sealants, tapes, flashing	Self-drilling screws, butyl tape, roof flashing, joint tape	lump sum	-	Estimated for full envelope
17	Vapor barrier (optional in bathrooms)	Polyethylene sheet (0.2 mm)	m²	15	Behind MR gypsum in wet zones

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Total Envelope Material Coverage:

Conditioned floor area: 120 m²

Exterior wall area (net): ~94 m²

Interior partition area: ~86 m²

Roof sloped area: ~124 m²

This table provides a practical basis for procurement, costing, and construction planning. Quantities include standard allowances for cutting waste and overlaps as typical in light steel framing projects in developing tropical regions.

Note: Foundation, MEP (mechanical, electrical, plumbing), flooring, paint, and fixtures are not included.

 

The previous material takeoff focused on the building envelope and primary framing (walls, roof, insulation, cladding, doors, and windows). However, a complete house requires additional materials for structural integrity, weatherproofing, interior finishing, and system integration.

Below is a table of other essential material types not previously listed, along with their estimated quantities for the 120 m² single-story light steel framed house.

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Additional Material Quantities (Not in Original List)

No.	Material / Component	Specification / Description	Unit	Estimated Quantity	Purpose / Notes
1	Concrete (foundation)	Reinforced strip footing or slab-on-grade, C20/25	m³	28–35	Depends on soil; ~250 mm thick slab = 12 m × 10 m × 0.25 m = 30 m³
2	Rebar (for foundation)	Deformed bars, Ø10–12 mm	kg	600–800	For footing/slab reinforcement
3	Anchor bolts	M12 or M16, hot-dip galvanized, 300–400 mm long	pcs	40–50	Connect sole plate to foundation @ 1.2–1.8 m o.c.
4	Steel sole & top plates (wall tracks)	92 mm depth, 0.75–1.0 mm BMT, U-channel	linear m	160	Bottom and top tracks for all walls (exterior + interior)
5	Roof purlins (secondary members)	C-section, 75–100 mm deep, 0.55 mm BMT	linear m	220	Support OSB roof deck @ 600 mm o.c. over trusses
6	Self-drilling screws (SFS)	Ø4.2–4.8 mm, 25–50 mm length, corrosion-resistant	kg	35–40	For steel-to-steel, OSB, and gypsum connections
7	Gypsum joint tape & compound	Paper/mesh tape + setting-type joint compound	rolls / bags	12 rolls / 15 bags	For finishing drywall seams
8	Paint (interior)	Acrylic emulsion, 2 coats	liters	90–100	~0.8 L/m² × 120 m² walls & ceiling ≈ 96 L
9	Floor finish	Vinyl plank, ceramic tile, or polished concrete (user choice)	m²	120	Full floor area
10	Ceiling battens or furring channels	Light-gauge steel, for gypsum ceiling support	linear m	180	If ceiling not directly fixed to truss bottom chord
11	Flashing & drip edges	Galvanized or aluminum, for roof eaves, rakes, penetrations	linear m	50	Prevent water ingress at edges
12	Ridge cap & side lap fasteners	Color-matched screws with neoprene washers	pcs	600	~5 screws/m² of roofing
13	Electrical conduits & boxes (rough-in)	PVC or EMT conduits, junction/outlet boxes	m / pcs	200 m / 40 pcs	Basic lighting & power layout
14	Plumbing pipes (rough-in)	PPR or CPVC for water; PVC for drainage	m	80–100	Two bathrooms + kitchen
15	Roof gutters & downspouts	Aluminum or PVC, 150 mm gutter, 75 mm downpipe	linear m	24 (gutter) + 8 (down)	Perimeter roof drainage
16	Termite shield / moisture barrier (slab)	Polyethylene vapor barrier (0.3 mm)	m²	125	Under slab to reduce moisture rise
17	Insulation retaining mesh or netting	Plastic or wire mesh to hold glass wool in place	m²	110	Optional but recommended for vertical cavities

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Notes on Estimation Basis:

Foundation: Assumed reinforced ground slab (common in tropical regions); alternatives like pier-and-beam would change concrete/rebar needs.

Fasteners: Light steel framing typically uses 1 screw per 300 mm for sheathing and 1 per stud for gypsum.

Paint: Based on standard coverage (10–12 m²/L per coat); includes walls and ceiling.

MEP (Mechanical, Electrical, Plumbing): Quantities are rough-in only-fixtures (toilets, sinks, lights) excluded.

Gutters: Required in high-rainfall areas (Philippines, PNG); often omitted in arid zones but included here for resilience.

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The following are not included in any quantity above and must be added based on local standards or client preference:

Kitchen cabinets & countertops

Bathroom fixtures (toilets, sinks, showers)

Lighting fixtures & switches/outlets

HVAC or ceiling fans

Landscaping, fencing, septic tank

Permit fees, labor, transport

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This expanded list ensures a realistic procurement plan for a turnkey-ready structure using light steel framing in challenging climates. For actual projects, a detailed BOQ (Bill of Quantities) from construction drawings is recommended.