Leaky shower pan Installation occurs when either the liner is cut to short on the perimeters or nails piercing below the water line which sits slightly above the curb. Weep Holes not transparent or water can become stationary and puddle in and around the foot area and these are the main reasons for which i'm about to explain (Bathroom Remodeling, Fixing Shower Pan in Oklahoma City).
1st, most installers will use the traditional method of 40ml liner made by Oatey or Richman and should have a lifetime replacement guarantee with proper installation. I've been in the business when we've seen showers leak from many sources. Partial slab separation on stem wall or plumbing weep holes plugged. Clogged and backed up drains are the root to many of the shower failures we see today. With the industry forging ahead and vendors changing the way installation products are being implemented and used for speed to enhance time and budget is why it can get so confusing. Take for example, ''NEW MORTAR BASED THINSET IN A BUCKET'' that is damped with ammonia to keep the past soft so it can be stored for long periods of time. ''Well, what can happen in this case so many times'' is the installation never has time to cure after being applied and tiled over, and in other words, it is like being put back in to the container and sealed back up. We used this ''THINSET AMMONIA BASED PRODUCT'' and it stayed wet behind the wall for months after installation and had to be fixed and this was after 6 months. Then an apparent thing happened after the installation, ''WHITE MILKY SUBSTANCE AND OR CRYSTALLIZATION, which in this case shouldn't have been white because it was thinset, but because all the additives the shower sucummed to the annals of adhesives used in your BASICS of showers. Here we take the bad out of that mistake and simplify our procedures for the basic install. Glue of all things need air and time to dry. Mastic will always fail in a shower especially in the lower regions of the drain and shower footing area.
2nd off, we don't use these products ( AcrylPro, ReliaBond , Mapei, glues in showers). I've been in the business for over 20 years and in almost all premature failures it has been the foundational problem of PRODUCT FAILURE. Glues break down over night with heat and water temperatures are always causing the face of the tile to warm and if there is leaking at the pan or in the corners it will soak and then sponge. In just months after installation it will begin to get milky and white crystallization occurs at or near the drain. Most adhesives can be used at chest level in the shower but here we don't even recommend it because typically their is soap dishes and grab bars that pull and tear away at the soft and cumbersome glue. I love using these companies that produce these products for the standard back splash and around your tub enclosures but in the shower and bathtub (GET THEM AWAY). A good tile guy or service expert will agree but in most cases the customer has to ask for it and if you don't know then get your pocket book out. Here we help to inform and educate the principal (our client) in making the informed decision.