Civil Engineering Reference
In-Depth Information
10.5.2 Two-Course Concrete Roofs
Figure 10-3 gives information on the fire resistance ratings of roofs that consist of a base slab of concrete with
a topping (overlay) of an insulating concrete; the topping does not include built-up roofing. For the transfer of
heat, three-ply built-up roofing contributes 10 minutes to the fire resistance ratings; thus, 10 minutes may be
added to the values shown in the figure.
10.5.3 Concrete Roofs with Other Insulating Materials
Figure 10-4 gives information on the fire resistance ratings of roofs that consist of a base slab of concrete with
an insulating board overlay; the overlay includes standard 3-ply built-up roofing.
Cellular concrete
Concrete
Carb base
Sil base
SLW base
3
2
1
3
2
1
3
2
1
4 hr.
3
4 hr.
3
4 hr.
3
2
1
2
2
1
1
0
2
4
0
2
4
0
2
4
Thickness of concrete base slab, in.
Perlite concrete
Concrete
Carb base
Sil base
SLW base
4
3
2
1
4
3
2
1
4
3
2
1
4 hr.
4 hr.
4 hr.
3
3
3
3
2
2
2
2
1
1
1
1
0
2
4
0
2
4
0
2
4
Thickness of concrete base slab, in.
Vermiculite concrete
Concrete
Carb base
Sil base
SLW base
4
3
2
1
4
3
2
1
4
3
2
1
4 hr.
4 hr.
4 hr.
3
3
3
2
2
2
1
1
1
0 1 2 3 4
0 1 2 3 4
0 1 2 3 4
Thickness of concrete base slab, in.
Figure 10-3 Fire Resistance Ratings for Two-Course Roof Slabs
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