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Lobster
 
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Default Attaching new ceiling joists over the stairwel

Further to my (now resolved, thanks) query about joist hangers earlier
this week, this project has thrown up another query for which I'd be
grateful for some advice.

Basically, I'm infilling the stairwell to reclaim the space for the
upstairs room (but not using ropes like the guy who posted about this
yesterday!) I've fitted new joist sections perpendicular to the stairs,
and maintaining 2m headroom, I want a suspended ceiling up the stairway
(ie running parallel to the stairway, 2m above it). This will form a
large bulkhead in the room above (partly inside a new cupboard, partly
exposed).

What I'm not sure about is how to set up the three joists which will run
up the stairs, supporting the new suspended ceiling, ie at the point
where they contact my new joists.

ASCII art option (a) shows how I'd like it to look, using 3x2 timber for
the angled joists, giving a neat ceiling angle below. However, I feel
the angled joists ought to be supported underneath by the new floor
joists to give them adequate strength, as in option (b) or maybe (c).
But with that option I lose some space in the bedroom as the stairway
ceiling will be higher than it needs to be; furthermore, I don't like
the ceiling profile this gives.

What to do? I suppose option (d) would work, but that would require
stonking great angled joists about 8" thick, which is surely overkill.

Is there be a method of attaching the angled joists as in option (a) in
a safe and secure way, which will keep the BCO happy (they will see it
in due course). Is there some form of timber-timber joist hanger that
would do? One reason I'm concerned about the strength of the angled
joists is that the angled area in the upstairs room could be construed
as being 'floor' rather than 'wall' or 'ceiling'...

Thanks for any pointers (and thanks for reading this far!)

David


(a)


\
\ ___
\ | |
\ \| |
\ | J | "J" is the newly inserted
\ | | joist, perpedicular
\|___| to the stairway
(in cross-section)




(b)

\ \
\ \
\ \
\ \
\_____\
| |
| |
| J |
| |
|___|


(c)

\
\
\
\
\
\ \
\ _\_
\ | |
\| |
| J |
| |
|___|


(d)

\
\
\
\
\
\
_\
\ | |
\ | |
\ | J |
\ | |
\|___|

 
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