Since 1927, the Uniform Building Code (UBC) requires the installation of a firewall between the garage and the home. Is A Firewall Required Between The Garage And The House? If not, you can check above the garage door-the one leading into the home- to see if the joist is running directly over the door frame. You’ll have to confirm this by checking the attic or underlying floor space if either is available. Occasionally, a parallel wall can be a load-bearing wall if it is running directly beneath a single joist. There are exceptions, such as partial walls in the garage which may be also running perpendicular, or a side/adjoining room within the garage itself. Anything running parallel to the ceiling joists, including the wall separating the garage from the house, is most likely non-load bearing. Your exterior walls are always going to run perpendicular (90 degrees) to the ceiling joists. How Do You Know If A Garage Wall Is Not A Load Bearing Wall? Also, anywhere that joists are cut, where the cut end sits on top of a perpendicular frame, that is a load-bearing wall. Your exterior walls are also load-bearing, which is visible from the attic where the exterior rafters meet the ceiling joists. To determine if a wall is load-bearing from your attic, look to see where the braces are-framework traveling from the rafters down to the joist-and where those bracers meet on the floor of the attic, if there is a wall beneath that, then it is a load-bearing wall. How Do You Tell If A Garage Wall Is Load Bearing From The Attic? Interior walls can be load-bearing, but most likely they aren’t and are just the studs spaced 16” apart, sheetrock, and/or insulation. They don’t necessarily bear the weight of the roof down the center, but they have to bear the weight of the wind as it pushes the roof in a lateral motion. The exterior walls are always going to be load-bearing.
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