---
title: "Short note: Doors and its types"
subject: "Building Technology"
chapter: 6
key: "semester_6/building_technology:doors-types-short"
source: https://www.bctengineer.com/q/semester_6/building_technology/doors-types-short
site: BCT Engineering
---

# Short note: Doors and its types

Building Technology · Chapter 6: Doors and windows

- Asked in: 2064 Jestha (old course), 4 marks
- Video: [Types of Doors - Building Construction](https://www.youtube.com/watch?v=Rk7fxgiXxrM) — ALE Review - ArkiVHEY
- Answer checked by Claude Opus 5.5 (high effort) on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_6/building_technology/doors-types-short
- Whole chapter: https://www.bctengineer.com/md/semester_6/building_technology/chapter-6

## Question

Write a short note on doors and its types.

## Short answer

A door is a movable barrier for entry, exit, privacy, and protection. Types by construction include battened/ledged, braced, framed/panelled, flush, glazed, and louvred doors. Types by working operation include sliding, folding, revolving, swing, and rolling shutter doors. Materials include timber, steel, aluminium, UPVC, and glass.

## Answer

A **door** is a movable barrier fixed in a wall opening for entry, exit, privacy, security and weather protection. It has a frame and a shutter.

#### Types by construction
- **Battened and ledged door:** vertical boards held by horizontal ledges; cheap, for stores and sheds.
- **Battened, ledged and braced door:** diagonal braces added to stop sagging.
- **Framed and panelled door:** stiles, rails and panels of wood, plywood or glass; the usual door for houses and offices.
- **Flush door:** flat faces of plywood over a timber frame; plain and modern.
- **Glazed door:** panels of glass for light and view.
- **Louvred door:** fixed or movable slats for ventilation (bathrooms).

#### Types by working
- **Sliding door:** moves on tracks, saves space.
- **Folding door:** hinged leaves fold together.
- **Revolving door:** turns on a central pivot, used in hotels and banks.
- **Swing (double-acting) door:** opens both ways, used in hospitals and kitchens.
- **Rolling shutter:** steel slats rolled on a drum, used in shops.

Doors may be of timber, steel, aluminium, UPVC or glass. Timber must be well seasoned, free from defects and preferably treated (sal, teak, sisau, uttis in Nepal).

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. Why are diagonal braces added to a battened and ledged door?
   A. To prevent sagging
   B. To add ventilation
   C. To make a flush face
   D. To accommodate glass
   Answer: A. Braces stop the shutter dropping, useful in wider doors. (Key point: Battened braced)

2. What describes a flush door?
   A. Stiles, rails and panels
   B. Flat faces of plywood over a timber frame
   C. Slats fixed in a frame
   D. Leaves on a central pivot
   Answer: B. Flush doors have plain smooth faces. (Key point: Flush door)

3. Where is a double-acting swing door used?
   A. Hotel lobbies for air conditioning
   B. Godowns as rolling slats
   C. Hospitals and kitchens
   D. Bathrooms for ventilation
   Answer: C. It opens both ways, helpful for trolley traffic. (Key point: Swing door use)

4. What is required of timber used for doors?
   A. Green and freshly cut
   B. Any softwood
   C. Painted only
   D. Well seasoned, defect-free, preferably treated
   Answer: D. Seasoned and treated timber resists warping and decay. (Key point: Timber quality)