Suz wrote:
"Phil L" wrote in message
. uk...
Suz wrote:

We want to specify heavier than normal joists in the extension. What
size should we ask for?

Which joists?
ceiling or floor?
what for?

The idea is to have real sturdy floor to minimise any bend and noise
transference. The longest one will be in the roofspace and as the kids will
be there I want to reduce the elephantitis noise from above.

I do know that insulation is needed too, but just want to use this
opportunity to make a really good addition to the house, not bare basics.

New build joist sizes are already on the excessive side. Suggest
instead a floating ceiling below and not attached to the floor. This
means a separate set of 2x3 joists just to support the ceiling. Much
more effective.

The other thing is the floor above. A floating wood on underlay on wood
floor will help further.

Finally sealing up of all gaps, however small, makes a real difference.
But not nostrils.


NT