56. What is the main construction material of the roof of this dwelling or flat?

Part 3: Information about housing
The DTV collects information about the housing situation of the household. Do not collect housing information for specific demographics.

Question 56: What is the main material for the roof of this house/apartment?
The DTV asks questions in combination with observations to determine the correct information for Question 56.

The roof is the part located on the top of the house, to protect the building from top to bottom (provide cover from rain and sun, heat insulation, heat preservation, waterproofing - covering function) and connected to walls, columns, beams, and bracing elements of a residential building, creating the overall stability of the whole building (bearing function).

Some roofing materials are specified as durable materials, including: reinforced concrete, and tile.

Some roofing materials are specified as temporary materials, including: roofing sheets (fibre cement, thin plastic, sheet metal), leaves/straw/oil paper, or other materials.

In case the roof is made of tiles imitating tole, cold tole, insulated tole, corrugated tole and has a firm supporting structure (iron frame, timber, etc.) which is firmly connected to the masonry wall, reinforced concrete column, then the tole roof is considered to be made of durable material.
In case the house has 02 or more roof layers (heat-proof, leak-proof roof layers,...), DTV asks to determine the main material of the roof built to protect the building; excluding heat-resistant, leak-proof layers as the main materials of the roof.

In the case of a solidly built house with one floor or more, the roof of the first floor (ground floor) is made of concrete, on the top floor pillar concrete columns are made, surrounding walls are built, and the roof is covered with tole, fibre-cement, plastic panels, and plaster ceilings,...and this top floor is used for living activities, then the DTV determines that the main material for the roof of this house is concrete roof.

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In case the household regularly living in 2 or more houses on the same lot, the main roofing material is taken from the main house.