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;u <br />'; <br />_'a�i <br />. ,TM <br />uponor <br />OCt. 29, 2012 <br />To Whom It May Concern: <br />Continuous lengths of Uponor AquaPEX° and Wirsbo hePEXT" crosslinked polyethylene (PEX-a) tubing offer the <br />greatest system integrity, and their use is the normal practice for in-slab or under-slab installations. However, <br />in certain situations, Uponor recognizes splices or joints in Uponor AquaPEX and Wirsbo hePEX may be <br />necessary for tube installed in or under a concrete slab. In such instances, it is important the installer uses the ��b <br />proper fitting for the application and observes proper installation techniques. Below is a list of fittings most �-�''� <br />commonly used with Upono� AquaPEX and Wirsbo hePEX tubing, along with a brief overview of their <br />appropriate usage and limitations. <br />• ProPEX° engineered polymer (EP) fittings (tees, elbows, couplings or plugs) are the most versatile <br />fittings and can be buried diredly in the soil, in or under a concrete slab in both exterior and interior <br />applications, or in concealed or accessible spaces. <br />• ProPEX lead-free (LF) brass fittings (tees, elbows, couplings or adapters) may be buried directly in the <br />soil, under a slab in both exterior and interior applications, or in concealed or accessible spaces. Note <br />that fittings buried directly in concrete must be completely wrapped with a piece of flexible insulation <br />or similar isolating makeriai. <br />• ProPEX yellow brass fittings (tees, elbows, couplings or adapters) for installations in non-potable water <br />applications may be used in concealed or accessible locations, but must be completely wrapped with a <br />piece of flexible insulation or similar isolating material if buried in or under a slab in both exterior and <br />interior applications. <br />Additionally, PEX tubing for potable hot- and cold-water distribution is approved for installation directly within <br />or below concrete slabs, provided the application of any required pesticide/termiticide treatment is done <br />according to recommendations. The PEX tubing is not required to be sleeved; however, Uponor's installation <br />instructions recommend using either flexible polyethylene (PE} protection sleeves or rigid PVC bend guides at <br />all slab penetrations to protect the PEX tubing from abrasion. <br />When using Uponor's pre-sleeved tubing products or a protection sleeve around the tubing, an annular gap <br />between the protection device and the PEX tubing will exist. In such installations, the installer must fill the <br />annular gap between the protection device and the PEX tubing at the exposed ends to prevent pathways for <br />pests and the mistaken application of harmful chemicals into this space. The following sealants may be used <br />with Uponor PEX tubing provided the sealant manufacturer has approved its use for contact with PEX. <br />• Latex caulk <br />• Latex foam <br />• Silicone sealant <br />• Polyurethane expanding foam <br />Provided the above requirements are followed, the applicable Uponor warranty will remain in effect for the <br />PEX tubing and ProPEX fittings. For further questions, please refer to the Uponor Complete Design Assistance <br />Manual (CDAM), the Plumbing Design Assistance Manual (PDAM) or contact Uponor Technical Services at <br />888.594.7726 or technical.services@uponor.com. <br />Sincerely, <br />Dale E. Stroud <br />Senior Director, Offerings/Marketing <br />Uponor North America <br />Uponor, Inc. <br />5925 148�" Street West <br />Apple Valley, MN 55124 <br />Tel: (800) 321-4739 <br />Fax: (952) 891-2008 <br />Web: www.uponor-usa.com <br />Uponor Ltd. <br />2000 Argentia Road <br />Plaza 1, Suite 200 <br />Mississauga, ON L5N iWl <br />Tel: (888) 994-7726 <br />Fax: (800) 638-9517 <br />Web: www.uponor.ca <br />