Hip Roof Ventilation Requirements

A full 4 sheet with wafer cuts showing top and bottom uncut for 6 to gain cross strength.

Hip roof ventilation requirements.

You could require compensating with additional exhaust. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation. 2018 international residential code. 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.

Exhaust intake of 50 50 requires 17 5 feet which is insufficient but i see some say 40 60 is acceptable and this then reduces to 14ft. Hip vents get wafer cuts of 12 with 6 solid plywood intervals step 2. Enter your square footage. Since i ll apparently lose about 1ft at each end of the ridge for blending this is right at the limit.

A number of problems that could come up when trying for the ventilation of hip roofs is able to be that there s possibly not sufficient exhaust ventilation. Figure 7 mechanical ventilation used with a hip roof. Always have a balanced ventilation system. And in many of these cases the hip roof forms a large volumetric attic space to ventilate.

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. On the upcodes website. Chapter 9 roof assemblies. Contains sections covering roof framing roof sheathing and roof ventilation.

Chapter 8 roof ceiling construction. Of course there should be intake vents to ensure a balanced system. Calculate or enter the square footage of the attic or area to be vented. 2018 international residential code.

Foot requires cobra exhaust vent structure of 17. Roofer is recommending ridge vents and uses gaf cobra which has 16 9 nfa per lineal foot when hand nailed. One method is to use a powered attic vent with a humidistat thermostat located close to the ridge or top of the roof.