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Foundation waterproofing is a process used to prevent water from absorbing into a structure's foundation. The majority of foundations are made with concrete, which means they can eventually crack and erode if enough water seeps into them. Several methods of foundation waterproofing are used, each with different benefits. When appropriately done, foundation waterproofing will last for decades.

Liquid Membrane Waterproofing

With this type of foundation waterproofing, liquid membranes are brushed or sprayed on the concrete's surface before dirt is back-filled around the foundation. The liquid membrane is applied thickly and when it dries, the substance has a rubber-like consistency. Liquid waterproofing is not only easy to apply but also inexpensive to complete. While the process does not take much time, the waterproof covering tends to vary in its thickness. The installer's skill level will determine how uniformed the waterproof covering will be.

Sheet Membrane Waterproofing

Sheet membranes are another way to waterproof an exposed concrete foundation. This waterproofing material is formed in large sheets made of asphalt and a substance similar to rubber. These materials are attached to plastic-like membranes. The backside of each membrane sheet is applied to a sticky adhesive that is covered by a paper backing.

During the application process, the paper on each sheet membrane is removed. Then, the sheets are pressed firmly against the foundation. Careful application is necessary because the adhesive will immediately stick to the surface. It is necessary for two people to apply and smooth out a single sheet; one person works at the top while the other person works at the bottom.

Once the membrane sheets are applied in a side-by-side configuration, a certain type of tape is placed over the seams. After the seams have been taped, the foundation can be back-filled with dirt. The main advantage of sheet membrane foundation waterproofing is that the material has an equal thickness and does not take a long time to dry. The negative aspects of sheet membranes are their high cost. And if it is installed incorrectly, the sheet will be destroyed when removed.

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