I don’t want to be one of life’s bores - but don’t cut through a joist - particularly on a floor that is expected (required) to take the imposed load of a bath - without providing an alternative adequate support for the loading.
From the photos you have provided this is either by properly plating the existing joist or installing a parallel joist (preferred solution).
Whilst many regard Building Regulations as a pain, they are there to protect you, and as someone above said - do you really want the bath in the kitchen? My view is that is unlikely to happen - but a partial failure, severing live water pipes is not an unknown event after the substructure has been compromised.
Be aware that if that does happen as a result of actions taken by the homeowner or plumber, an insurance company is likely to question the resulting claim.
I have no issue at all with the work being undertaken by an informed DIY enthusiast. However, a lot of houses built since 1990 do not have the same factors of safety built into the above ground floor or roof structures. That is not an issue until they are modified without due consideration as to how the revised loading is carried to the foundations.
In this case, the clue that the cross joists are “light” is that the main soil pipe has been boxed in between two joists and that the ceiling is mounted on trimmers below the joist - hence the need for a hanging strap around 90 degree bend as the soil waste transits from the horizontal to the vertical.
From the photos you have provided this is either by properly plating the existing joist or installing a parallel joist (preferred solution).
Whilst many regard Building Regulations as a pain, they are there to protect you, and as someone above said - do you really want the bath in the kitchen? My view is that is unlikely to happen - but a partial failure, severing live water pipes is not an unknown event after the substructure has been compromised.
Be aware that if that does happen as a result of actions taken by the homeowner or plumber, an insurance company is likely to question the resulting claim.
I have no issue at all with the work being undertaken by an informed DIY enthusiast. However, a lot of houses built since 1990 do not have the same factors of safety built into the above ground floor or roof structures. That is not an issue until they are modified without due consideration as to how the revised loading is carried to the foundations.
In this case, the clue that the cross joists are “light” is that the main soil pipe has been boxed in between two joists and that the ceiling is mounted on trimmers below the joist - hence the need for a hanging strap around 90 degree bend as the soil waste transits from the horizontal to the vertical.
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