Roof construction details for CLTD tables

From ASHRAE (1989), with permission

Click here to see definitions of layer codes and thermal properties.
Click here to see CLTD tables of roofs without suspended ceilings.
Click here to see CLTD tables of roofs with suspended ceilings.

Roof No.

Description

Code number of layers

1

steel sheet w/ 1" insulation

A0 E2 E3 B5 A3 E0

2

1" wood w/ 1" insulation

A0 E2 E3 B5 B7 E0

3

4 inches l.w. concrete

A0 E2 E3 C14 E0

4

2" h.w. concrete w/ 1" insulation

A0 E2 E3 B2 C12 E0

5

1" wood w/ 2 " insulation

A0 E2 E3 B6 B7 E0

6

6" l.w. concrete

A0 E2 E3 C15 E0

7

2.5" wood w/ 1" insulation

A0 E2 E3 B5 B8 E0

8

8" l.w. concrete

A0 E2 E3 C7 E0

9

4" h.w. concrete w/ 1" insulation

A0 E2 E3 B5 C5 E0

10

2.5" wood w/ 2" insulation

A0 E2 E3 B3 B8 E0

11

roof terrace system

A0 E2 E3 B6 E2 E3 C5 E0

12

6" h.w. concrete w/ 2" insulation

A0 E2 E3 B6 C13 E0

13

4" wood w/ 1" insulation

A0 E2 E3 B2 B9 E0