How should insulation be laid in the attic?

[Love68]

I will start insulating the attic of our garage and quickly became unsure how to lay the insulation boards at a joist shown in the picture. Should I just lay it straight over or should I cut it to fit in each compartment and then lay a patch piece on top of the joist?

Thanks in advance for wise advice!

 

[fribygg]

If you haven't already bought insulation, I would suggest loose fill; if you already have insulation in sheets, make sure to cut it so it fits in the compartments.