Seal the Joints Around the Plumbing
Identify the joints near the plumbing and apply sealant to them. Make sure the sealant you are using is formulated to prevent mold and mildew. Your laminate flooring manufacturer may specify a brand of sealant to use. If so, be sure to use that brand.
Seal Around the Appliances
Use sealant to prevent water seepage from appliances in the room. Run a thin layer of sealant along the edges where the appliances meet the floor. If you are sealing laminate flooring in a kitchen, be sure to seal under and along the edge of the refrigerator and dishwasher, and under the sink.
Seal the Room Border
In laundry rooms and bathrooms, it is important to seal the border of the entire room due to the moisture that these rooms can be subject to. Make sure to fill all of the expansion joints in the doorways as well.
Install Transition Strips
You may need to add T-molding transition strips in the doorways bathrooms and laundry rooms as well to complete the sealing process. These strips function to provide transition in a house between different kinds of flooring. To install these transition strips, use nails or screws to install the track in the doorway. Make sure the strip does not buckle. If necessary, the transition strip can be adjusted to fit the space by making cuts in the strip. If the strip feels rough, it should be sanded down. Use a hammer to lightly secure the transition strip.