Velux window timber strengthening

Yes agree with that but wanted a bottom opening velux design for lofts not middle opening as those size you suggested.
 
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Regardless of this, given that you've cut two rafters I would try to add a additional 3x2 at either side - as the velux isn't quite at mid span it should be ok - or send velux a sketch - they might check it for you (but they might also try to sell you a shorter window!).
 
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