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What is above the 2nd floor?  Is this usuable attic space?

What if he added plywood sheathing to the top of the ceiling joists w/
screws and glue?  Then you could just insulate the whole area if you don't
plan on using it for anything else.

Just a thought, no experience behind it.
----- Original Message -----
From: "ebosco(--nospam--at)vogeltayor.com" <ebosco(--nospam--at)vogeltaylor.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Friday, November 22, 2002 11:48 AM


> I am renovating my two story 1912 dutch colonial which is balloon framed.
> The ceiling joists on the second floor are 2x4 members (full 2x4
dimension)
> which in some locations span as much as 15'.  The mid-span deflection of
> these members is 1/2" in some locations and the small depth of the members
> gives me little room for adding insulation to the second floor ceiling.
>
> In reviewing the alternatives for improving the situation it seems like a
> very stong beam is produced by stacking a second 2x4 or 2x6 on top of the
> existing joists. I would connect the two by lag bolting vertically through
> the top member into the bottom one.  A benefit of this plan is that I
could
> use the bolts to raise the sagging members slowly over a period of months
to
> reduce cracking of the plaster.
>
> Has anyone ever seen this approach applied? Any recommendations for lag
bolt
> frequency? Would it be necessary to add a vertical plywood plate (or
plates)
> to the edge of the beam to help the two act as one?
>
> This is a time when I wish my engineering experience covered more that
> Mechanical, Electrical and Plumbing.
>
> Thanks
>
> Ed Bosco, PE
>
>
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