In fact, there are a number of alternative ways that you can solve the flexing issue besides spray foam. Have you ever tried to get that stuff out of your clothes? That would reduce the flexing and you wouldn’t have to deal with cleaning up foam spray waste. If any additional support is needed, you can probably accomplish the same end result by sliding a couple of pieces of shimmed down treated wood under the pan. Most shower pans are perfectly capable of withstanding the weight of a person standing in them. In all honesty, this is often less of an issue than people make it out to be. So, before you start a project like this, there’s one consideration that deserves discussion… Do You Even Need To Worry About Your Shower Pan Flexing? It’s designed to not expand aggressively.īut I keep feeling compelled to emphasize that this is not an intended use for spray foam. And so, you could end up with bowing or even cracking of your shower pan.Ī product like Great Stuff Window and Door (link to Amazon) is the only type you would want to consider. The reason for this is that when foam expands it exerts pressure against opposing forces. Only a minimal-expanding foam should be used under a shower pan. I’ve come up with my share of creative ideas when rehabbing houses over the years so I can appreciate the appeal of this. Where the spray foam approach is commonly talked about is rental property owners and house flippers who are looking for easy, inexpensive solutions. It’s more common with less expensive acrylic designs that are commonly found in the big home improvement stores. If you have a cultured granite shower pan, flexing isn’t usually going to be an issue. What Type Of Shower Pans Are Prone To Flexing? This usually doesn’t hurt anything as the pan is designed to hold weight but many people are bothered by it. When you stand in the shower, you feel the pan (or bottom) of the shower give way a little underneath your feet. Some pans come manufactured with supports underneath but often they are not enough to completely eliminate flex. It’s designed to this way because the pan has to facilitate water movement toward the drain. The design of most shower pans is similar to that of modern bathtubs in that the bottom of the area where you actually stand often does not touch the ground. Still, it’s a popular DIY solution that’s worth understanding. It’s important to understand that this approach is not considered best-practice and in conversations with several contractors, most would not recommend this. Apply weight to the pan until the foam has cured.Only use minimal-expanding spray foam to prevent damage. But the following guidelines should be followed: Using spray foam under a shower pan: Spray foam has become popular in recent years as a solution to reducing flexing of a shower pan. If you are considering using spray foam under a shower pan, there are few important points that you need to consider.
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