I was frantic last week to seal my coop up as it is/was very drafty with a vent running across the ceiling line which is of course where the chickens like to roost. We sealed it all with great stuff - this coop is temporary as DH is building a new one but it won't be done for another months or two. But, now I am worried about ammonia build up. I clean the coop once a week and replace the wood shavings, but it is stinkier than it used to be. Did I overdo the sealing?? How much vent should they have??