I am removing a glass sliding door to the patio and want to remove 2 feet more of the wall. I need to put in a new header to cover the door opening and the extra 2 feet that I am opening up. The wall is an outside wall, at an l corner of the house. I went to Home Depot to order the glu lam header and they asked me to calculate the amount of pressure on that wall.
Can someone PLEASE tell mehow to do that?