Building a shelf in the loft

[GeneralLiability]

Howdy,

The roof is in good nick, and there are solar panels. The loft is unboarded and heavily insulated. For mounting an in-line extractor fan I ideally need to build a platform above the insulation so that the ducting angles down and it's above the insulation.

I was going to place wood from a joist to the rafter above it, and screw it into both positions, then do the same on the adjacent joist/rafter. I was then going to connect these two pieces and suspend the fan at that point.

Can I actually screw anything into rafters, or are they not to be touched?

 

[Static]

Screws and nailing are fine.. just remember to only use the saw on new wood..

 

[GeneralLiability]

Phew.

Had visions of waking up to find solar panels in the bathroom. thanks for answering so quickly!