On Monday, 3 June 2019 00:27:10 UTC+1, ss wrote:
On 02/06/2019 22:37, tabbypurr wrote:

An option not yet mentioned is to add crosspieces between joists each side of the cut so the joist you cut gets supported by its neighbours.

I will google that for further info, thanks Tabby..

same method as used for loft floor openings


NT