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Tim Lamb[_2_]

In message ,
writes
On Thursday, 15 February 2018 13:35:57 UTC, Andrew wrote:

Standard fitment in all new houses. Much stiffer and stronger
so less of those creaky chipboard floors that 70's houses
suffer from.

The 22mm chipboard or t&g plywood flooring is glued on all
four sides and also glued onto the top section of the beam.

Metal web joints. Thanks all for that.

So if most (all?) residential new builds use MWJ (as known to its
friends) as a base for ceiling plasterboard and floor ply, can they be
used for loft extensions where they are fixed to the walls slightly
above existing ceiling joists? The lightness, and sufficient (?)
strength in comparison to "steels" would in my uninformed position,
make MWJ the ideal base for the floor in a loft extension. Or do they
have shortcomings that prohibit their use in loft extensions?

Don't see why not. If you are not securing the loft extension joists to
the existing ceiling ones, I think you need to ensure they don't deflect
and touch the ceiling plasterboard.

--
Tim Lamb