All municipalities have different requirements but some do not draw a hard line on requiring exhaust fans.
Relish roof bath requirement.
The intent of tmcs is to remedy health and safety defects particularly life threatening deficiencies.
Every bathroom whether big or small needs to follow certain building codes in its construction.
And no portion shall be less than 5 ft.
Bathroom ventilation fan duct routing routing a bath vent duct down out or up through an attic or roof out.
Surprisingly bathroom fans are not required by some building codes.
For rooms with sloped ceilings at least 50 of the floor area shall have a height of at least 7 ft.
Code requirements the international building code 2012 edition ibc 2012 requires enclosed attics and enclosed rafter spaces formed where ceilings are applied directly to the underside of roof framing to have cross ventilation for each separate space.
These codes determine the distances.
Bathroom code does address the issue of moving odor and moisture laden air from the bathroom to the outside.
These statutes appear in the latest edition of the minimum property standards.
Family dwellings being rehabilitated with funding subject to the construction requirements of the single family umbrella rule shall comply with tmcs as well as state and local codes ordinances and zoning requirements as applicable.
The net free vent area nfva shall not be less than 1 150 of the area of the space being.
The roof is a simple 12 12 with gable ends but to get the height for stairs and an upstairs bathroom we added two shed dormers that start at the ridge so no changes in slope.
In all cases the ducting needs to conduct the exchaust to the building exterior and needs to terminate in an animal proof vent cover.
Hud requirements for proper ventilation.
This article describes routing bath exhaust fan duct upwards through an attic or roof space or downwards through a floor or crawl space.
Mps 403 3 the following us department of housing and urban development statutes covering the ventilation of structural space furnish a basic guide for determining proper ventilation styles and sizes for any home.