We have a old brick floor for our garage and we can't seem to get rid of mushroom's that have been growing through the bricks. We have purchased a commercial outdoor wall bleaching material to get rid of them, but it only worked for a short while. This was done @ full strenghth. We plan on removing the bricks to pour a concrete floor once funds are available, but at this time we need to get rid of the mushrooms. I know mushrooms can crack, lift, destroy concrete & need to know how to make sure they are completely gone before we set new concrete for our garage. The house used to be a carriage house for the farm house back in the 1800's, don't know how old our house really is at this time or what is under the bricks. We do know the terra cotta sewer line runs under the bricks, but is no longer in use. Last year our town updated the sewer systems & forced all homeowners to connect to the new system.

I think unfortunately that whatever moisture and/or other conditions are allowing the mushrooms to grow probably needs to be addressed first, but it doesn't sound as if it's financially feasible now.

My first recommendation would have been bleach, but appparently that's not a long term solution and it can certainly cause quite an odor that isn't healthy to anyone in the area. You'd proably have to avoid using the garage for several days if you poured bleach on the floor.

The following are just thoughts to help kill the mushrooms and dry out a shallow area; I've never had this problem so I don't know how well they would work.

White vinegar can kill some foliage.

Cornstarch and baking soda as well as salt can be used as drying agents. There might be some commercial drying agents that others more familiar with this issue could recommend.

You could try small areas to see if any of these help.

Good luck; sounds like it's a really frustrating problem.

This message has been edited. Last edited by: GardenSprite,

mushrooms and toadstools are a fungus, so any fungicide should work to kill it, but unless you adress the underlying cause, moisture and decaying organic matter, it will return

That is really annoying and you should fight what is rally causing the issue instead of going for short term solutions