Moisture Barriers vs. Waterproofing Membranes: What are the Key Differences?

Building a structure involves choosing the type of windows you want to use or the building roof’s color and other things. For instance, selecting the best product for reinforcing concrete plaster walls means considering several things. You need to think of the different types of waterproofing membranes or moisture barriers available on the market, what each is made of, and why you should pick certain types over others. Here are things to keep in mind when choosing a product for your home.rn## The difference between membranes and barriers rnA waterproofing membrane prevents liquid water from moving through spaces. Though it can slow down moisture movement, it cannot stop vapor from traveling through a material. Waterproofing and moisture barriers have different purposes. For example, using a waterproofing membrane is better for containing water in an area, like a shower pan.rnrnMeanwhile, moisture-reduction barriers are in place to regulate water vapor. They fill the substrate’s pores with polymer or epoxy and are better suited for high-moisture slabs. These barriers keep the water from passing through the product limits, and they can also provide the necessary controls for high-moisture areas.rn## What makes these two materials distinct from each other rnWaterproofing membrane has an almost liquid, rubber-like consistency. You apply this material like you would wall paint; when treating a substrate with it, you use a 3/8-inch nap paint roller. Also, you need two coats of this material for it to be at its most effective. rnrnOther types of waterproofing membranes need reinforcing fabrics or meshes, though trowel- or roller-based applications are more common. Cement-based waterproofing membranes also exist. This type of material is essentially a cement powder with an additive that makes the mixture flexible. You can apply this using a trowel, and you can reinforce it with a fiberglass mesh to make the material stronger.rnrnSomething else you could use to ensure your building envelope’s integrity is a moisture-reduction barrier. Plastering in the Bay Area requires robust materials since San Francisco is a relatively humid place, and epoxy-, polyurethane- and polymer-based products provide that strength. Epoxy does an excellent job of filling pores and guarding against vapor transmission. However, this type of material can be unwieldy, and these membranes will also have certain emission limits.rnrnA workaround would be to use polyurethane-based moisture barriers, which you can apply with a paint roller. An advantage of using this type of wall treatment is it is pre-mixed, which saves you time and prevents you from getting frustrated. rnrnAlthough it also has its moisture limits, it is better able to prevent water from seeping. There are also polymer-based reduction membranes, which are widely available in the market. One downside to using polymer-based items is it does not have the same limits as the other types of barriers.rn## Conclusion rnIn the end, you’re choosing between preventing water or water vapor from seeping through the walls. If you need to stop liquid water from moving through the external walls and into your home, you need a waterproofing membrane. However, if you’re building structures with high-moisture concrete slabs and need to install solid sheet vinyl, it’s better to use moisture-reduction barriers.rnrnIf you have a construction project, consulting with One Stop Plastering will help you make a sturdy, robust building. We offer Bay Area plastering services, including waterproofing, leak detection, and others. Call or email us today for more information!