There are some disadvantages of eco-bricks that should be considered before using them in construction projects. The first is that, because they are made of compressed organic matter, they can be susceptible to moisture damage and decay if not properly sealed. Additionally, eco bricks are not as strong as traditional bricks and may need to be reinforced with other materials for certain applications. Finally, eco bricks can be more expensive than traditional bricks due to the time and effort required to make them.