Roofs

Wood Framed Roofs

Wood-framed roofs fall into the same category as wood-framed walls. They simply disintegrate in a major tornado. Next time you see TV news films of a tornado hitting a house, observe what goes first. Watch the roof!

Insulated Reinforced Concrete Roof Decks

Because of their weight, concrete roofs typically must be supported by concrete walls.

In order to assure that the concrete shell structure will develop its full capability to resist the imposed destructive forces, it is essential that the roof structure provide a competent structural diaphragm incorporating a cast-in-place reinforced concrete slab or well-connected precast concrete planks in order to develop the full potential of a concrete shell.

There are several manufacturers of insulating concrete forms in North America for cast-in-place concrete slab systems.

Roof deck form planks

Figure 5. Typical insulating roof deck form planks manufactured in North America and designed for cast-in-place reinforced concrete roof decks.

Roof cross-section

Figure 6. Cross-section of a cast-in-place reinforced concrete roof deck formed with ICF planks shown in Figure 5.

Ridge And Valley Beams

There can be a number of different approaches to the configuration of ridge and valley beams that might be used and will likely be developed by individual contractors. Figure 7 suggests several possibilities that have been shown to be workable.

Roof and valley beams

Figure 7. Sectional view shows suggested cast-in-place reinforced concrete ridge and valley beams using a CIP closure pour integral with the reinforced concrete diaphragm roof. As with the wall-to-roof connection, the ridge beam is poured compositely with the cast-in-place roof deck slab.

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