Hi my name is ***** ***** I have been in the home improvement and repair field for 20 years. I will be glad to help you today. If it has not been leaking for a long time then it will very likely just need to be dried out. The first thing to do would be to remove any wet insulation and open the crawl space vents. Inside the laundry room put a dehumidifier for a day or so and that will remove any moisture in there. Once it is dry then assess the trim and see if it remains soft. Likely it will dry out and it is very likely the worst case is you will have to replace any trim that is swelled if it got that wet and replace the insulation. If the wood seems rotted from being wet for a long time then that would be a different story and also check for any black mold. Black mold usually only happens after an area has been wet and dark for a long time.
It is not unusual. Once the crawl space is dried out there will not be any more mushrooms. They cannot grow unless it is damp and dark. They will grow after a short time of the area being wet. Black mold will grow after an extended period of time. I am assuming you did not see any black mold and that is very good. Once you have everything dried then it may be a good idea to spray a little water and bleach mixture in the area to kill any remaining spores. Then once it is dry and the insulation replaced be sure to leave your crawl space vents open during non-freezing months. The air circulation will keep the environment fresh and dry.
You will see that a joist that is water damaged will be soft and swelling. There is not a lot of expertise that is required to notice a rotted, water damaged joist. Consider this for comparison, when they are building the house they start with the floor joists then start putting the plywood down for the floor. They may get done with that stage and then are delayed by rain for a couple days. When the rain stops, they come back and start putting up some walls and carry on, no damage done. I doubt you have any more water on the joists than would have happened during a rain storm so there really are no worries as far as that goes. At worst the drywall might be a little damaged or the trim but I have doubts about that too. I really think that you are looking at only replacing some insulation. No risk at all in drying it out and carrying on. The bleach and water mixture will be good to spray around nay areas that are growing mushrooms too.
The crawlspace will dry out with the vents open. If you want it to dry faster you could put a fan or two down there. The bumpy part of the laminate is the backing of the laminate swelling. The dehumidifier will dry that out but the swelling may have stretched the surface of the laminate so it may not be as pretty as it was when it was new. The reason you would use a dehumidifier inside but fans in the crawl is that the laundry room is isolated to the dehumidifier will be effective there but not so much in the open area of the crawl space. Judging from the pictures it really does not look like there is anything to worry about structurally at all. Any water damage is going to be on the more porous materials like the drywall, insulation and flooring. At worst there may be a water stain. If that is all there ends up being then there is a product called Kilz. It is a paint that will cover stains or discolouring.
I will be calling it a night for now. Feel free to ask any further questions. I am glad to continue to help although my replies may be quite delayed until tomorrow evening. I check in in the morning before going to work and then will be back online all night tomorrow night too. You can still comment or ask questions even after positively rating my service if something comes up also. I will always respond. Mike
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