Hello all,

I need to replace a 22mm pipe under the kitchen floor. The original one, it
appears, was put in when the house was built as there is no way I can get a
length under the joists.

The joists are 4" x 2" resting on brick supports. The routing would take the
pipe parallel to and 12" from the support.

Q. Can I cut a U shaped notch 22mm deep in the top of each 4" joist, 12" from
the support, without seriously weakening the joist?

Thanks

AndyM