Calculating the size of the header depends on what the header needs to support.
Sliding door in weightbearing.
Doors in a load bearing wall that holds the weight of the house created by beams and trusses need a larger header than those in non load bearing walls.
The header is usually made out of dimensional lumber installed on its edge.
This is because the center of mass of the door lags slightly behind the driven end as the door starts and stops moving.
And our contractor told us that that s a bearing wall and we can t do that.
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The reason why this project is so difficult is due to the potential danger a load bearing wall supports the structure so its absence through accidental destruction could lead to the room or entire house collapsing.
Well look even if it s a bearing wall you can frame for it but here s what you have to do if your door is 2 feet wide the finished width is say 24 inches the size of the opening that you need for this is double that.
If you pull from the bottom the weight of the door is tempted to lag behind and tip over causing the whole mechanism to bind.
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Inserting a door or window in a load bearing wall can be a tricky situation but not an impossible one.
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