"SteveF" wrote in message
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"Charlie S." wrote in message
news:65BKe.5875$D4.4999@trndny07...
Looking at the floor joists of our porch I noticed they are resting on a
long board that is nailed horizontally into the band joist. The porch
has to be at least 60 - 80 years old. I can't believe the board has
supported these joist without separating from the sill all these years.
I'm not a carpenter, but I can tell this isn't a good way to support a
floor, even if it is just a porch floor. The joists span 9.5 feet.
Pictures of the 3rd - 8th joists in this site
http://mysite.verizon.net/stamkis/id2.html show you how the joist rest on
this hanging board. You can't see the sill it's nailed into.
Need to shore up the porch before putting in new posts. Thus, I need to
support the outer band joist and this joists holding board at the same
time. Was looking to use A-frame structures to catch the both
beams/boards. However, I am just afraid the nails of this joist
supporting board may come loose or crack if I don't do it right. Any way
to replace or support this beam so it will have some more structural
integrity?
I wouldn't get really worried if it has held this way for over 60 years.
If you want to reinforce the floor joist to band joist connection the way
to do it is with joist hangers. In this case the ones that wrap around
the bottom won't work so you will have to go with the simple angle plates.
As you can see from the cracks extending from the notches, that's why code
doesn't allow that anymore. The 10D nails made specifically for the joist
hangers have a vertical shear load, not a pull out load, so the 1 1/2 inch
length is plenty.
Not sure where you are going with the A frame. The porch is attached to
the house so you only have to worry about a vertical load. Are you
replacing the block columns? If so, I'd get some 4x4s, foot long pieces
of maybe 2x8 and some oak shims from a mobile home supply store (or a
bunch of cabinet shims). Cut the 4x4s 2 inches short of the distance from
joist to footer (if going to ground you will need some 4" concrete blocks
to spread the load on the ground). Put the 2x8s so they spread the load
on the band joist and the horizontal board and put the 4x4 under it.
I think you are saying to nail the 2x8 beneath the band joist and the joist
hanger... to spread the load. I like the concept and will do something
similar. The only problem is I can't put the 4x4 underneath it because I
have to remove the granite footing and pour a new footing first.. either
sauna tubes or a form. I prefer the form. You may have seen the
footings..on the link
http://mysite.verizon.net/stamkis/id1.html
I need to make a support that gives me total access to the area beneath the
sill without the support resting on the space beneath it. I figured some
sort of A-frame setup would give me more room to work with.
I had also thought of supporting the band joist by using a 6x6 to run
perpendicular it. The 6x6 would run from under the porch to outside. It
would be supported by a platform with jacks on both sides. A contractor I
spoke with said jacks would be too risky. I added a picture of the jack
setup I was thinking about to the website. Please see
http://mysite.verizon.net/stamkis/id2.html
From the picture, it looks simple. And, doesn't seem that risky to me.
But, I don't work with these things all the time.
into the space between the 4x4 and the 2x8 and tap them till everything is
really tight. One 4x4 next to each column (on each side at the corner)
ought to be plenty until you get the permanent columns built. Put a
second 4x4 on a floor or bottle jack if you need to adjust for any
settling.