The master bathroom and the 2nd bathroom vent through the roof and through the same opening.
Install bathroom ventilation through roof.
Slide the vent under the shingles so they cover the top half of the vent flange.
This discussion is now found at bathroom vent up through roof.
For optimum performance locate it between the shower and the toilet.
Any person competent in installing an outside vent either thru the roof soffit or gable hip end of the house thru the siding.
The 2nd bathroom vent drips on the floor and is ruining the ceiling.
Apply a bead of asphalt roof cement on the bottom of the vent.
Install the roof vent install the roof vent by sliding the top flange under the shingles above it and resting the bottom flange on the shingles below.
Center the nail between two rafters.
From the roof find the nail and use the utility knife to cut roof shingles from around the nail.
Climb into the attic and clear away any insulation from around the hole.
A grille in each bathroom attaches to ducts which then fasten to a y connector at the fan.
I prefer to run a bath vent to outdoors via a horizontal line that goes across an attic and out through a gable end wall or one that vents down and outside through a roof overhang or soffit.
A single exhaust exits through the roof figure a.
Apply roofing adhesive on the underside of the flanges to seal.
Taking advantage of this natural process referred to as passive ventilation is the most common way to vent an attic.
From inside the attic drive a nail through the roof directly above the bathroom vent fan.
Hot air exhaust vents located at the peak of the roof allow hot air to escape.
The 2 pipes one a 4 master and the other a 3 2nd do not go through the ceiling but into a common box that goes through the roof.
This system is quiet too.
Nail the lower corners with roofing nails and tar the heads.
Choosing a whole house fan.
Secure the vent flanges with roofing nails before installing the shingles.
Use an extra long 3 8 inch diameter spade bit to bore a reference hole through the ceiling and into the attic.
Bath exhaust fans routed up through the roof.
The lower half of the flange sits on top of the shingles.