Installing New Main Bearing Wall
Posted: February 2, 2013 Filed under: Work in Progress | Tags: beams, posts Leave a commentHere are some photos from the installation of the new posts and beam in center of the house. The wood is the Douglas Fir that we picked up last week. The wood is wet (ie: moisture content is 35% or more). Wet wood shrinks as it dries, so we had it milled lightly oversize (beam width of 13.25″ instead of 13″).
As it shrinks the supported upper floor will drop, so we wanted to minimize this effect on doors etc upstairs. The idea was to jack the entire second floor up by an extra 0.25″ and then place the beam and posts, and set it back down.
Unfortunately we could not jack it up this much. We could get it about 1/8th inch max. So we dropped the beam back down and planed it to the exact size, and then installed again.
So the second floor will drop as the beam shrinks. Plan B: if it shrinks too much we can use wedges to raise the second floor in a year or so if the second floor comes down too much (I will leave access to the top of beam so I can do this wedging if necessary. My trim at top of beam will be ‘floating’ so it will hide any gap that results from wedging.