Sunday, April 8, 2012

Pretty much every 90 year old is sagging somewhere...

The cleanup of the yard superseded the framing of the pony wall. The following weekend I returned to finish framing the pony wall, and I realized that the subfloor was sagging pretty heavily on one side.  

You can see how badly.  Here in the interior of the house you can see how far on part of the floor is sagging.

The reason is that the house subfloor was built in two pieces. The first piece was a square section, with rim joists all around. The second section was then hung off the front of the first section, attaching the new joists to the first section's rim joist. This sounds confusing, but all you need to know is; this was a very weak way to build the subfloor. Ideally the joists should've ended over a floor beam.

Why is this important? Well, when I replaced the floor beams  and jacked up the house, the nails started to slip and the joists began to effectively fall off. Awesome, huh?

Here you can see the floor sagging. The beam is behind it keeping the other side of the floor perfectly level. :)

This shows it a little better. You can see that the two sections are joined here.  See the dark siding on the left and the lighter siding on the right?  The section on the left is sagging.  In the middle of the house, where we had some heavy items like a cast iron bathtub and tools, it was sagging more - close to a couple inches.

This was going to be a pain. I finally figured out I could jack it up with tow jacks on the rim joist near the sag and lift it enough to install the level pony wall.

I also went ahead and jacked up the interior and leveled the subfloor as best as I could. Eventually what I need to do is install new floor joists that span this joint. So, I'll cut out a chunk of the old rim joist, and install a new joist that spans between the new beams.

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