Sources — Rumah kebaya — Rumah Adat Nusantara

Every dimension the house is generated from is below, with its class and its citation. This is the project’s honesty layer, and it is given a room of its own because a smooth 3D render implies a precision the sources do not have.

The dimensions

Dimension	Value	Class	Citation
Width of the plot, boundary line to boundary line. It is not the house’s figure: it was there before the house was built, and on the far side of that line is somebody else. What is measured against it is not the wall but the eave — a roof that oversails a boundary is a matter between neighbours rather than a question for the builder.plotWidth	16.00 mIf 20% out: 1.60 m	Interpolated	No source
Depth of the plot, from the road backward.plotDepth	22.00 mMoves no measurement	Interpolated	No source
Distance from the front of the langkan to the road line, on a plot that fronts the road.roadSetback	4.50 mMoves no measurement	Interpolated	No source
Distance from the front of the langkan to the road, on an inner plot reached along a lane. A house that does not front the road is still measured against it.pathSetback	8.00 mMoves no measurement	Interpolated	No source
The least clear distance that has to be left between the house and the side boundary. It is this building’s limit, and somebody else drew it.sideMargin	1.20 mMoves no measurement	Interpolated	No source
Width of each room. More rooms make a wider house, and a wider house walks toward the boundary.roomWidth	2.90 mIf 20% out: 1.74 m	Interpolated	No source
Depth of the body of the house, behind the langkan.coreDepth	9.50 mIf 20% out: 0.40 m	Interpolated	No source
Height of the brick plinth above the ground. A city house on low ground that floods: a low masonry platform rather than posts.plinthHeight	0.55 mIf 20% out: 0.11 m	Interpolated	No source
Height of the wall to the plate.wallHeight	2.60 mIf 20% out: 0.52 m	Interpolated	No source
Thickness of a board wall.wallThickness	0.08 mMoves no measurement	Interpolated	No source
How far a post foot sits down into the brick plinth. Without it the post only touches the plinth on one plane, and a joint whose members do not enter each other holds nothing.postSeat	0.06 mMoves no measurement	Interpolated	No source
Section of a timber post.postSection	0.14 mMoves no measurement	Interpolated	No source
Thickness of a floor tile — bought by the piece, and the first floor in this project that was purchased.tileThickness	0.03 mMoves no measurement	Interpolated	No source
Depth of the langkan: room enough to receive somebody, sit, and do business without opening a door.langkanDepth	3.20 mIf 20% out: 0.64 m	Interpolated	No source
Height of the langkan rail. Low on purpose: it marks the edge rather than closing it, and somebody on the road can still see who is on it.langkanRail	0.62 mMoves no measurement	Interpolated	No source
Rise of a step from the yard up to the langkan.langkanStep	0.18 mMoves no measurement	Interpolated	No source
Where the roof changes pitch, measured from the ridge to the eave. That fold seen from the side is what gives this house its name.foldAt	0.38If 20% out: 0.54 m	Interpolated	No source
Pitch of the upper plane: metres of fall for each metre out.upperPitch	0.62If 20% out: 0.33 m	Interpolated	No source
Pitch of the lower plane, which has to be shallower than the upper one — otherwise there is no fold, and the house is no longer a rumah kebaya.lowerPitch	0.30If 20% out: 0.26 m	Interpolated	No source
Overhang of the tiled roof.eaveOversail	0.70 mIf 20% out: 0.06 m	Interpolated	No source
Thickness of the tile covering.roofThickness	0.09 mMoves no measurement	Interpolated	No source
Height of the gigi balang board along the eave.gigiHeight	0.28 mMoves no measurement	Interpolated	No source
Thickness of the gigi balang board.gigiThickness	0.03 mMoves no measurement	Interpolated	No source
How far the gigi balang board reaches up into the tiling it is nailed to.gigiOverlap	0.04 mMoves no measurement	Interpolated	No source
Depth of the tested joint engagement, as a share of the smaller member.jointEngagement	0.30Moves no measurement	Interpolated	No source
The langkan is a raised floor at the front of the house, with a low rail and no door between it and the road: a neighbour, a trader or a stranger can stand on it, be received on it and leave from it without ever being let inside. The twenty-nine buildings before this divide space among people who belong to them; this one has a room for people who do not.theFrontIsForStrangers	1Moves no measurement	Canon	Arsitektur Tradisional Daerah Khusus Ibukota Jakarta (Departemen Pendidikan dan Kebudayaan, Jakarta, 1986).
The house stands on a plot with a boundary line down each side, and on the far side of that line is somebody else. A tongkonan is bounded by rank, a khaim by its tree, a sudung by what a person can carry, a malige by the reach of an arm. This one is bounded by a line — the first constraint in this project that is somebody else’s property rather than a material or a body.theLineIsSomebodyElses	1Moves no measurement	Canon	Heuken, A., Historical Sites of Jakarta (Cipta Loka Caraka, Jakarta, 2007).
The roof changes pitch partway down: steep over the house, then shallower out over the langkan. That fold seen from the side is what gives the house its name. The Banjar rumah bubungan tinggi also takes its name from a roof, and that is a different claim: there four roofs stand in a row along one ridge, here one slope bends once.theRoofFolds	2Moves no measurement	Canon	Swadarma, D. & Aryanto, Y., Rumah Etnik Betawi (Griya Kreasi, Jakarta, 2013).
Zero materials taken from the ground it stands on. Its timber comes down a river to a yard and is sold by the length; its tiles are fired elsewhere; its floor tiles are bought by the piece; and its nails — the only nails in this collection — are bought too. This is not a note about materials but about a city: the house is built out of a market rather than out of the forest around it.everythingIsBought	0Moves no measurement	Canon	Heuken, A., Historical Sites of Jakarta (Cipta Loka Caraka, Jakarta, 2007).

Bibliography

depdikbud-1986 · reference
Arsitektur Tradisional Daerah Khusus Ibukota Jakarta (Departemen Pendidikan dan Kebudayaan, Jakarta, 1986).
heuken-2007 · reference
Heuken, A., Historical Sites of Jakarta (Cipta Loka Caraka, Jakarta, 2007).
swadarma-2013 · reference
Swadarma, D. & Aryanto, Y., Rumah Etnik Betawi (Griya Kreasi, Jakarta, 2013).

Which of these matters most

Nearly every dimension on this page is the author’s own. What the provenance bar does not say is whether that matters. Each row below is computed by rebuilding the house: one dimension is pushed 20%, and the house is measured to see how far it follows. Nothing is estimated — the figures are the difference between two runs of the generator.

1roomWidth1.74 mwidth of the house
2plotWidth1.60 mroom left to the boundary
3langkanDepth0.64 mdepth of the terrace
4foldAt0.54 mwhere the roof folds
5wallHeight0.52 mheight of the ridge
6coreDepth0.40 mheight of the ridge
7upperPitch0.33 mheight of the ridge
8lowerPitch0.26 mheight of the ridge

If only one dimension could be surveyed, this is the one. This is sensitivity, not uncertainty: it shows what moves, not how likely the value is to be wrong. The 20% is itself the author’s choice.

Invariants

There is no measured drawing yet, so correctness rests on structural truth. These checks fail the build.

pass
Bilateral symmetry about Symmetric about the axis of the plot, x = 0 — and deliberately not front to back, because what is at the front is a road
200 points; largest mirror deviation 0.00 mm.
pass
Every tenon contained in its mortise
2 pasak, takik and tumpu joints; every one engaged.
pass
No joint spans more than one stage
Every joint engages two parts from the same stage or from consecutive ones.
pass
Stage ordering, and nothing below ground
22 parts, every one bearing on something already standing or on the ground.
pass
Mesh integrity: indices, triangles, normals
14 triangles; indices in range, none degenerate, every normal unit length.
pass
Everything stands inside the plot, clear of the boundary
A 8.70 m house on a 16.00 m plot, leaving 3.65 m to the boundary against the 1.20 m that has to be left. The plot was there before the house, and the width follows from how many rooms the household wants: nothing relates those two numbers but this rule — and on the far side of that line is somebody else.
pass
The front is for people who are not let in
A 3.20 m terrace with a 0.62 m rail and no door between it and the road; this house’s first door is behind it. To get onto the langkan nobody has to pass a door, and to get past it everybody does.
pass
The roof folds, and its shallow plane is the one over the terrace
The upper plane falls 0.62 m per metre and the lower 0.30 m, with the fold inside the line of the house. That fold seen from the side is what gives this house its name — and the shallower plane is the one shading the langkan.
pass
Every part declares the dimensions it came from
22 parts, every one tagged. By least-sourced input: 0 measured, 0 canon, 22 interpolated.
skipped
Checked against a measured drawing of a real house
Skipped. No measured drawing has been wired in, so there is nothing to compare against. This check will not be made to pass by weakening it.

What a check is preventing

Ten green rows are not a reason to believe anything. So one check is run against a house built to break it, and what is printed below is that check’s own verdict rather than a description of it.

Wider rooms are the plainest improvement anybody could ask for, and no part of the building objects: the plinth stands, the frame carries, the roof still folds, the terrace still faces the road. What the house meets is a line. Past a point its eave comes inside the distance that has to be left to the boundary, and beyond that boundary is a neighbour. It is the first limit in this project that belongs to somebody else — and what crosses it first is not the wall but the roof, which is exactly how the argument happens between neighbours.

The house as built

pass6.50 m / 6.80 mhow far the eave reaches · how far anything may reach

A 11.60 m house on a 16.00 m plot, leaving 2.20 m to the boundary against the 1.20 m that has to be left. The plot was there before the house, and the width follows from how many rooms the household wants: nothing relates those two numbers but this rule — and on the far side of that line is somebody else.

Rear prow raised to 3.1 m

fail6.91 m / 6.80 mhow far the eave reaches · how far anything may reach

atap comes within 1.20 m of the boundary; gigi-a comes within 1.20 m of the boundary; gigi-b comes within 1.20 m of the boundary

The second house is never rendered. It is built during the build, failed, and thrown away.

This bar moves as real surveys are wired in. That movement is the project's progress metric.