Hip Roof Ventilation Requirements

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.

Hip roof ventilation requirements.

Chapter 9 roof assemblies. And in many of these cases the hip roof forms a large volumetric attic space to ventilate. 2018 international residential code. In no case should the amount of exhaust ventilation exceed the amount of intake ventilation.

Since i ll apparently lose about 1ft at each end of the ridge for blending this is right at the limit. A full 4 sheet with wafer cuts showing top and bottom uncut for 6 to gain cross strength. One method is to use a powered attic vent with a humidistat thermostat located close to the ridge or top of the roof. 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. 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. Foot requires cobra exhaust vent structure of 17.

Calculate or enter the square footage of the attic or area to be vented. Federal housing authority recommends a minimum of at least 1 square foot of attic ventilation evenly split between intake and exhaust for every 300 square feet of attic floor space. Enter your square footage. Hip vents get wafer cuts of 12 with 6 solid plywood intervals step 2.

You could require compensating with additional exhaust. 2018 international residential code. Figure 7 mechanical ventilation used with a hip roof. Always have a balanced ventilation system.

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. An attic room of 1 200 sq. 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.