How To Ventilate A Hip Roof

What is the optimal ventilation for a hip roof we have a hip roof in need of replacement and there is discrepancy in the ventilation suggestions.

How to ventilate a hip roof. Explore owens corning ventilation products. Summary overview for contractors planning to install the cobra hip vent. They now have solar powered units which provice a cfm rating of 800 cfm. There are two ways to vent an attic under a hip roof.

So we would need at least six metal vents in addition to the lower soffit ventilation to meet minimum ventilation requirements. Leave uncut sheathing of a 6 at gable ends. The calculations before indicated that we needed 2 square feet of ridge or upper roof ventilation. Try covering the full ridge of the hip roof using cobra exhaust vent.

A normal metal pot vent produces only 50 squares inches of free net area. One contractor is recommending 2 attic fans and a ridge vent one is recommending 1 attic fan and a ridge vent and one is recommending 1 attic fan and 2 box vents. Two square feet equals 288 square inches. The leaving of this 6 defends the structure against wind propelled rains.

You can install mushroom vents in the field of the roof or you can use the code formula that allows roofs with adequate soffit venting to omit ridge vents. Another way to achieve the proper amount of air flowage instead of using the 10 feet of ridge vent would be to use only a powered attic ventilator fan on the roof top but definitely not using any additional roof top exhaust vents.