Gallon Batch problem

[beersdeep]

I've just made my second gallon batch which came out flat after three weeks of bottle conditioning. I had added 1 oz. of sugar solution before bottling, but both batches were flat.

Should I add more sugar than 1/5 of the standard 5 oz sugar measurement? I'm sure this is probably an easy fix but I'm kind of stumped.

 

[RM-MN]

What were the conditions of the bottle storage while they were supposed to be carbonating? Were they refrigerated or kept cool? They should have 3 weeks at 70 F. or above and you have to have capped them tightly. If you are using PET bottles, the lids are known to be a problem and you have to tighten them more than you would expect.

 

[TipsyDragon]

That's 1oz sugar plus some amount of water right? Not 1 fluid oz total?