Alfreton won for the sixth time in seven matches as goals from Adam Cunnington and Anton Brown helped them claim an away victory at Braintree.
Cunnington put the Reds ahead with a spectacular volley from 20 yards that left Nathan McDonald with no chance.
The Iron equalised 10 minutes later when Billy Gibson scored his first senior goal, heading in from Jai Reason's cross from the left wing.
But Brown won it for Alfreton with a six-yard header from Josh Law's cross.
VIEWS FROM THE DRESSING ROOM
Alfreton Town manager Nicky Law told BBC Radio Derby:
"We knew it was going to be difficult. That's about the worst pitch I've seen all season. We knew we had to come here and play against a resolute and strong Braintree side, who deserve to be where they are.
"To come down here for the second time in a week, with another four-hour drive like we did on Tuesday. We had a great result then we got another one today.
"At half-time, we didn't have harsh words, but we said we had to up our game and I thought we did that in the second half.
"I thought we coped with the conditions well and it is unsightly when you have to get to the ball and put it in behind them to play percentages, but on pitches like this, that's what you have to do and that's what we've done."