Typhoon Proof Roof Design

The pressures above show the upward wind pressure on the 3 main types of roof.

Typhoon proof roof design.

Design guidelines for hurricane resistant buildings. Hurricane resistant houses should use stronger plywood. Roof overhangs are subject to wind uplift forces which could trigger a roof failure. The round design allows the wind to blow around the home.

In the design of the hurricane resistant home the length of these overhangs should be limited to 20 inches. A round or multiple sided home is more resistant to hurricane strength winds. This can be illustrated in the diagram below from the whole building design guide organisation. A cat 5 hurricane proof log house is resistant to the winds up to 245 mph.

The outer siding of your home also needs to be an approved hurricane resistant material. Hip roofs with four slopes will perform better than gabled roofs with only two slopes. It s more expensive but much more resistant to blown debris. A gable end roof is generally cheaper to build but less wind resistant than a hip style roof.

For example you might find that the roofs in hurricane prone areas are multi sloped. The breakaway theory has therefore become less applicable to shed. Wall logs in such construction have to be made of circular reference glued laminated timber and all other components of the house have to be hurricane resistant. Many shed roofs of traditional design have survived the storm.

Hurricane hugo has proven the strength of the shed roof.