Scaling Recipe to 10 gallons

Just started brewing 10 gallon all grain batches.
And wanted to hear some input from those who brew larger batches.
Is brewing a double batch( 10 gal batch) as simple as just multiplying the malt and hop additions by 2?
would you still double amount of hops at 30 min, flameout, dry hop even though they dont affect ibus?
example
stone ruination clone
5 gallon 10 gallon
12.5lbs 2 row 25 lbs 2 row
12 oz 15L crystal 24 oz 15L crystal
1.75oz colombus 90 min 3.5oz 90 min
1oz centeniall 0 min 2 oz centenial 0 min
2.5 oz dry 5 oz dry hop

Yes. Just double the 5 gallon batch.

Yes, just double. Hops at 30minutes do provide an IBU contribution. Depending on your chill time, hops at flameout will even provide an albeit trivial flameout contribution. But in those cases (and dry-hop), you have the same amount of aroma/flavor compounds per unit hop in twice as much wort, so you’ll need twice as much hop to balance.

Don’t forget to double your yeast cell count, as well. Depending on the gravity, one dry packet might suffice (especially if you probably rehydrate to keep that high cell count around). If you’re using liquid, you should be making starters, and then either step your starters or get a bigger flask.http://yeastcalc.com/

(Er. s/probably rehydrate/properly rehydrate/. Not enough coffee yet.)

Since We are on subject of hops, should you increase amount of hops if using a mesh bag to hold hop pellets added to the boil?

Originally posted by bearbrew
Since We are on subject of hops, should you increase amount of hops if using a mesh bag to hold hop pellets added to the boil?

If you have a vigorous boil, I’d say that the mesh bag isn’t too big of an issue. On the other hand, since it is an IIPA, go ahead and add more hops!