Second Floor Addition Overhang

Seal all seams gaps and holes in the air barrier with caulk or foam.

Second floor addition overhang. Plan a second story photo via mwconstruction. After he has opened up the wall where the addition will connect he ll pull up the adjacent floor and attach new longer floor joists horizontal framing members alongside the existing ones a process called sistering so that they extend past the outer wall of the house to hold the weight of the bump out. Develop specific detailing for insulating the overhang area. Framers construct the second story floor system to match the layout of the main floor system.

First floor live loads have higher requirements than second floor live loads 40 pounds per square foot vs. Air seal the top bottom and sides of a cantilevered floor cavity and ensure that insulation is in full contact with all sides without voids. Allows for a complete transformation. Upgrade a wall with a floor overhang or cantilever on an existing home by adding rigid insulating sheating and or closed cell spray foam insulation and air sealing as follows.

While this major addition can cost anywhere between 90 000 200 000 it does add significant square footage and resale value to your home. A room used solely for sleeping might need to carry only 30 psf whereas a garage floor over a basement would need 50 psf or higher. Building a bump out is a big project that adds only a few square feet to a room. Here are some other ways to add square footage to your home but in some rooms especially bathrooms an extra 6 or 7 sq.

Measure the size of the opening between the floor joists underneath the cantilevered overhang. An inaccessible attic space on the other hand might have a live load of only 20 psf. If you do not need that much space and or money is tight a bump out might just the right improvement especially if you need only a little more space in a specific room like a bathroom or kitchen. If you need less space or cannot afford a full addition try a room addition one room tacked onto the side of the house typically one bedroom or one bathroom.

Inspect the existing wall and overhang framing for any deficiencies and make any corrections if necessary. Typically the second story floor joists will not only run the same direction as the first floor joists they will also be directly over them. Install a rigid air barrier or other supporting blocking to separate the cantilever from the conditioned space above.