Venting Garage conversion roof - What type of vents?

[outmyway]

I need to vent between each of my garage joists above the insulation.

The outside is just vertical plastic.

If I use these type of vents design for sofits I fear water might come in during heavy driving rain?

http://www.screwfix.com/prods/68936/Building/Damp-Proof/Circular-Soffit-Vent-White-Pack-of-10?

Can anyone suggest an alternative?

 

[Deluks]

These are for the soffit, the horizontal section between the fascia and wall so would be 'aiming downwards'. Is there no roof overhang?

These might be better:
http://www.screwfix.com/prods/65515...n/Over-Fascia-Ventilator-10mm-x-1M-Pack-of-10

 

[outmyway]

Thanks Deluks

Trouble is the facia has been put on over the old wood ... so no gap for those.

Ideally small circular louvre vents would be perfect