But larger is not always better when builders are constructing a home or adding a room addition.
Floor joist under load bearing wall.
The space i am opening is a little under 8.
After incomplete advise by a contractor on how to tell if a wall is load bearing i started tearing out all of the plaster walls realized the wall is load bearing.
However there is a large double 2x10 header above the entry way see picture 4 in this wall supported by a jack stud on either end see picture 5.
But for nonbearing walls why do any extra joists at all.
This wall is running parallel to the floor joists above see picture 4.
However the floor joists must also be adequate to support the additional load from the wall.
Therefore joists may run from wall to wall wall to beam or beam to beam depending on the size of the area they span and the structural design of the home.
Load bearing walls and floor joist spans how not to knock down a load bearing wall.
Makes the plumbers and electricians smile.
This would not be strong enough under normal construction methods to hold the floor above.
Score 1 for being non load bearing.
Nonetheless this does not ensure good floor performance.
The living room dining room is open concept and the kitchen is walled off.
Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor.
But in the past it had been necessary to install a staircase to these rooms above.
This meant cutting a hole in the joists and installing a trimmer joist 1 on.
For better performance the designer may wish to add a joist or blocking panels below the non bearing wall.
Generally when the wall in question runs parallel to the floor joists above it is not a load bearing wall but if the wall runs perpendicular at a 90 degree angle to the joists there is a good chance that it is load bearing.
When doubled fj s are under a non load bearing wall to eliminate the floor flex that creates a drywall crack above a door header on the wall above typically between a bedroom and master bath.
This verification can be achieved with our forte software.
When i draw plans i locate joists under bearing walls only for parallel walls off layout but i do it with two joists spaced apart the depth of wallplates above.
Thus for a 2x4 bearing wall two joists are below spaced 3 1 2 apart directly under.
The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example.
I see the doubled fj s under bearing walls with and with out a space between to allow plumbing sometimes.
