Why do home brew beer bottles explode?
As a result of excessive pressure build up in the bottle, caused by bottling too early when there was still unfermented sugar in the brew. You must wait until all the sugars are fermented out before bottling. Then you bottle your beer adding a small amount of sugar. A secondary fermentation then occurs in the bottle which produces a small amount of carbon dioxide which gives you the fizz. Too much carbon dioxide will cause bottles to explode.
