Construction Technology 2

Question 1

Allendale Road: Why did you use an inverted system?

Answer 1

Offered an enhanced level of protection due to the proposed foot fall appose to a warm of cold system.

Question 2

Allendale Road: Tell me the composition of the inverted system? And discuss each element.

Answer 2

1. Surfacing / Ballast (e.g. paving or pebbles)
2. Water Flow Reducing Layer
3. Inverted Roof Insulation Boards (e.g. extruded or expanded polystyrene)
4. Waterproofing System
5. Structural Deck (e.g. concrete)

1 Top of roof
5 Bottom of roof.

Question 3

Allendale Road: What were the paving sitting on?

Answer 3

Paving supports / pedestals

Question 4

Allendale Road: Why were the paving sitting on adjustable pedestals?

Answer 4

To provide a level surface for the paving as tapered thermal insulation was used.

Question 5

Allendale Road: Why did you use a bitumen system to the terrace appose to a single ply?

Answer 5

More robust due to having multiple layers (usually 3, 2nr under layers and a top layer) appose to the single ply (1 layer).

Robustness required due to the proposed use.

Question 6

Allendale Road: Why was a SE required?

Answer 6

To determine the increased live and dead loads and if any upgrade works were required to accommodate.

Question 7

Allendale Road: What were the live loads and what are dead loads?

Answer 7

Live loads = people

Dead loads = bitumen roof covering (heavy), paving, furnishings etc