Opening up the eaves - moving struts?

[leedavis88]

I'm currently planning a new bathroom. We would like a corner bath and to make room I need to move the struts/knee wall under the purlin back 500mm. I've attached a picture for reference. What considerations do I need to make for this to be done safely? You will see in the picture how thr vertical studs are nailed to the purlin and a piece of similar timber across the floorboards. What is the likelihood these are integral to the function of the roof and not just so a wall could be made in the bathroom?

 

[leedavis88]

Too look something like this...

 

[noseall]

In all likelihood the stud wall in view would have been built after the roof was complete. Whether it is enveloping (hiding) a mid-span support or offering support itself will be determined by the size and span of the purlin. Roofs are generally not supported by a floor unless there is direct support beneath the floor.