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Q 21.What is a Foshan Just Top shower pan?
A Foshan Just Top shower pan is a prefabricated, tile ready pan that is installed on a wooden or concrete subfloor using polymer-modified thinset mortar (1/2" thick). It does not require a shower pan liner underneath the system nor waterproofing on top.
Foshan Just Top shower pan is already pre-sloped and includes a pressure fitting drain system with no weep holes necessary. It is made of extruded polystyrene foam and is 100% waterproof.
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Q 22.Which Foshan Just Top shower pan sizes are available?
A Foshan Just Top shower pans come in 3' x 3', 3' x 4', 3 'x 5', 3’ x 6’ (center drain and offset drain), 4'x4', 4' x 5', 4' x 6', 4' x 7', 5' x 5', 5' x 6'; 6’ x 6 ‘and 5' x 7' sizes. These are the standard sizes which are equipped with a 4” x 4” brushed stainless steel drain cover.
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Q 23.Can I cut a Foshan Just Top shower pan to size?
A Yes, using a circular or table saw, the Foshan Just Top shower pan can be cut to size. The drain is centered so in order to maintain a proper slope layout, the shower pan should be cut equally on at least two sides. The 1/2" x 1/2" channel along the Foshan Just Top shower pan perimeter always needs to be remade so that the 1/2" Foshan Just Top building panels will fit properly.
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Q 24.Can I extend a Foshan Just Top shower pan?
A Yes, using Foshan Just Top Shower pan pre-sloped extension panels. These panels always need to be connected to the shower pan using a shiplap notch which is prefabricated into the extension panels. When extension panels are cut, the shiplap connection has to be remade into the panel. Foshan Just Top joint sealant must be applied inside the shiplap joint and an additional bead is applied on top of the shiplap joints (use a putty knife to smooth the Foshan Just Top joint sealant over the shiplap joints).
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Q 25.Do local building codes allow a Foshan Just Top shower pan system to be used instead of a conventional shower pan liner and mortar bed construction?
A Yes, local plumbing inspection departments recognize Foshan Just Top shower pan is rated as
waterproof as per ANSI 118.10 (tested using ASTM D4068; 48 hrs. standing water exposure and is certified with ICC-ES and therefore meets all UPC and IPC requirements.
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Q 26.How long does it take to install a Foshan Just Top shower pan?
A A standard size installation, for instance 3' x 5', takes approximately 60 minutes to install. A Foshan Just Top shower pan is tile ready after being installed on a wooden or concrete subfloor.
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Q 27.Foshan Just Top shower pans are installed in polymer-modified thinset mortar suitable for a substrate. Can I use Foshan Just Top joint sealant instead?
A No, please use a full surface setting bed of polymer-modified thinset mortar when installing the Foshan Just Top shower pan. This will ensure that no floor imperfections or voids under the pan could possibly produce vibrations (transferring into tile and leading to cracks) or hollow space sounds.
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Q 28.Why is a Foshan Just Top shower pan installation less expensive than traditional shower pan liner-mortar bed construction?
A If done properly, the traditional method includes a pre-slope, shower pan liner and mortar bed, which easily takes 8-12 hours to install, compared to approximately 1-2 hours for the Foshan Just Top shower pan. Depending upon the mortar bed thickness, 1-2 days drying time is often required before installing ceramic tile. The Foshan Just Top shower pan is tile ready immediately after installation.
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Q 29.Which ceramic tile sizes can be used with a Foshan Just Top shower pan?
A 2" x 2" or larger sizes can be installed with polymer-modified thinset mortar and cementitious grout. All ceramic tiles less than 2" should be grouted with an epoxy joint filler compound. For commercial applications or where wheelchair use is expected, contact Foshan Just Top Technical Support for the appropriate tile formats and setting material recommendations.
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Q 30.Why is a Foshan Just Top shower pan so much safer than a conventional concrete shower pan?
A The only way to safely install a conventional concrete shower pan is to apply waterproofing on top of the pan (though liquid membranes on concrete pans often crack).
However, a preslope is typically installed underneath the shower pan bed and pan liner, which allows water to run towards the weep hole drain. This process is unpredictable and water may simply remain sitting in the porous concrete bed due to clogged weep holes and cause mold growth.
Mortar bed shower pans often fail since the pan liner is sandwiched between the layers of concrete which can result in tears that cannot be seen or easily repaired (tears often occur especially where the pan liner is tightly installed over the curb and applied in a multi-corner fashion).
Another concern is the watertight installation of the pan liner toward the drain flange. Since the pan liner is nailed directly to the studs, leaks can occur where the fasteners penetrate it. Larger pan liner assemblies have to be joined together, the same as for corner pieces.
These seams are subject to constant water pressure and may tear apart during floor movement or simply when mortar beds initially dry out upon installation and therefore shrink. The Foshan Just Top shower pan does not absorb any water like concrete and completely protects the substrate from water exposure.
