What "man jobs" have you done today?

What screws do you use for screwing the loft boards down through the top of the loft leg? The top is quite thin isn't it, compared to screwing 2" or more into wood.
4x30mm as recommended by Loft Leg

 
Did you guys who have done loft boarding use OSB or chipboard panels? And did you use larger 600x2440 sheets or the packs of 3 smaller boards you can get from DIY shops?
I used the pack of 3 OSB Loft boards from Wickes

Larger boards would have been preferable (as my Joists aren't all evenly spaced - so ended up wasting quite a few boards cutting them to either just over 2/3 length or just over 1/3 length to bridge gaps and then placing the next full board). However I had no way of transporting bigger boards, and would struggle to get them through the loft hatch anyway.
 
I used chipboard loft boards, they are slightly bigger than the OSB ones. The difficulty is getting anything much larger into the loft.
 
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No, they are solid once you have the boards on them. They are all interconnected by the boards which also have tongue and groove edges to slot into each other.

If you have the height, go for the larger versions so you can get the full 300mm under them. 170mm usually means you are restricted to 250mm insulation on a standard 70mm roof joist.
 
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