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Subjects · Leaving Cert Construction Studies

Leaving Cert Construction Studies: Doors & thresholds

How often Doors & thresholds comes up on the Construction Studies papers, every year it was asked, and questions to try.

HL Asked on 3 of the last 9 Higher Level papers, most recently in 2023.

OL Asked on 5 of the last 9 Ordinary Level papers, most recently in 2025.

June 2028 is the first exam on the new Construction Studies course. These come from the 2016–2025 papers, so read them as a guide.

Doors & thresholds, Higher Level(6 marks)

Quick ones on Doors & thresholds.

(a)Why does a level threshold need a drainage channel outside?
  1. To carry radon gas away from the floor slab
  2. To stop rain pooling and driving in under the door
  3. To support the weight of the door leaf and its frame
(b)Why is a thermal break fitted below a door threshold?
  1. To stop the door creaking on its hinges
  2. To keep the door frame square and true
  3. To stop heat escaping at the floor edge
(c)What does a weather bar do at an external door?
  1. Stops wind-driven rain getting under the door
  2. Supports the door hinges against sagging
  3. Locks the bottom of the door leaf into the frame
Show the answers

(a) To stop rain pooling and driving in under the door

(b) To stop heat escaping at the floor edge

(c) Stops wind-driven rain getting under the door

Your turn: Higher Level questions on Doors & thresholds.

Higher Level

Asked on 3 of the last 9 Higher Level papers, most recently in 2023.

Every paper, year by year

YearWhere it came up
2025Not asked
2024Not asked
2023Q7
2022Not asked
2021Q1
2019Not asked
2018Q7
2017Not asked
2016Not asked

Links open the State Examinations Commission’s paper for that year.

More Doors & thresholds questions

Doors & thresholds, 3 marks

What separates the inner and outer metal of a thermally broken aluminium threshold?

  1. A solid galvanised steel core
  2. A strip of lead flashing
  3. An insulating plastic strip
Show the answer

An insulating plastic strip

Polyamide strips link the inside and outside sections, stopping heat flowing straight through the metal, so the floor edge at the door stays warm.

Ordinary Level

Asked on 5 of the last 9 Ordinary Level papers, most recently in 2025.

Every paper, year by year

YearWhere it came up
2025Q8g
2024Not asked
2023Q9
2022Q1
2021Not asked
2019Not asked
2018Q9
2017Q1
2016Not asked

Links open the State Examinations Commission’s paper for that year.

More Doors & thresholds questions

Doors & thresholds, 3 marks

Job of a weather bar at the bottom of an external door?

  1. Stops the door opening too far out
  2. Holds the bottom of the door locked shut
  3. Stops rain being blown in under the door
Show the answer

Stops rain being blown in under the door

Wind drives rain across the threshold. The weather bar throws water outward and away, so it cannot get under the door and into the house.

Doors & thresholds, 3 marks

Why is a drainage channel fitted outside a level threshold?

  1. It holds the door mat in place at the step
  2. It collects rainwater before it reaches the door
  3. It carries the sewage away from the house
Show the answer

It collects rainwater before it reaches the door

With no step to stop it, rain can pool at the door. A grated channel catches the water and drains it away from the threshold.

Doors & thresholds, 2 marks

Strip on a door frame that the door closes against?

  1. Door stop
  2. Architrave
  3. Skirting board
Show the answer

Door stop

The stop is fixed inside the frame (or cut as a rebate) so the door shuts flush and cannot swing through. It also helps seal out draughts.

Other Construction Studies topics

All of Leaving Cert Construction Studies