Fbc section 1203 5 ventilation.
Attic ventilation florida building code.
They can be found on a roof along the lowest eave or near soffits.
Indoor air quality in order to reduce contamination from concentrated sources and to reduce humidity either natural or mechanical ventilation must be supplied.
Intake vents allow air outside to enter attics and other areas of ventilation.
Exterior openings into the attic space of any building intended for human occupancy shall be protected to prevent the entry of birds squirrels rodents snakes and other similar creatures.
Unvented attic assemblies code notes 2009 irc 2012 irc adequate attic ventilation is a long standing requirement in building codes for moisture control.
The ventilation system shall be designed to supply the required rate of ventilation air continuously during the period the building is occupied except as otherwise stated in other provisions of the code.
Although soffit vents are not specifically mentioned as required both the international residential code irc and residential edition of the florida building code fbc r806 2 require an attic ventilation area of at least 1 150 of the area being ventilated which works out to be about one inch of ventilation opening for every square foot of attic area and not less than 40 percent and.
Proper attic ventilation can be an impor tant performance consideration when design ing and installing steep slope roof systems.
A well ventilated attic with roof vents can minimize potential damage and cost.
However unvented attics can reduce residential energy needs and are allowed by the code under certain conditions.
Openings for ventilation having a least dimension larger.
With the exception of smoking lounges the ventilation rates in table 403 3 1 1 are based on the absence of smoking in occupiable spaces.
Calculate or enter the square footage of the attic or area to be vented.
4 4 2010 florida building code mechanical ventilation table 403 3 continued minimum ventilation rates occupancy classification people outdoor airflow rate in breathing zone r p cfm person area outdoor airflow rate in breathing zone r a cfm ft2 a default occupant density 1000 ft2 a exhaust airflow rate cfm ft2 a offices conference.
Typically building codes include minimum requirements applicable to attic ventilation.
A home with a roof vent.
Code requirements the international building code.
Let owens corning roofing help you calculate exactly how much ventilation you will need for a healthy and balanced attic with our 4 step ventilation calculator.
There are two types of roof vents namely intake vents and exhaust vents.
The florida building code mechanical or the florida fire prevention code shall be provided as required by both codes.
Openings for ventilation having a least dimension of not less than 1 16 inch 1 6 mm and not more than 1 4 inch 6 4 mm shall be permitted.
