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� <br />H.;�x . .. <br />� Dcc. z9, 2ax2 <br />n'�r�= <br />`�. <br />"'" 7o Whom It May Concem: <br />uponor <br />Continuous lengths of Uponor AquaPEX° and Wirsbo hePEXTM crosslinked polyethylene (PEX-a) tubing offer the <br />greatest system integrity, and their use is the normal practice for in-slab or under-siab 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 <br />proper fitting for the appiication and observes proper installation techniques. Below is a list of fittings most ���.:+ <br />commonly used with Uponor 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 piugs) are the most versatile <br />fittings and can be buried directly in the soil, in or under a concrete slab in both exterior and interior <br />applications, or in concealed or accessible spaces. <br />'"`` • ProPDC lead-free (Lf) brass fittings (tees, elbows, couplings or adapters) may be buried directl <br />soil, under a slab in both exterior and interior applications, or in concealed or accessible spaces. N tee <br />� that fittings buried directly in concrete must be com letel wra <br />P Y pped with a piece of flexible insulation <br />or similar isolating material. <br />• ProPD( yellow brass fittings (tees, elbows, couplings or adapters) for instaliations 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 />'� "Additionaliy, 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 flexibte 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 />• L.atex caulk <br />• Latex Poam <br />• Silicone sealant <br />• Polyurethane expanding foam <br />Provided the above requirements are followed, the applir_able 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 />Manua( (CDAM), the Plumbing Design Assistance Manual (PDAM) or contact Uponor Technical Services at <br />888.594.7726 or technical services uponor com. <br />Stncerely, <br />Dale E. Stroud <br />Senior Director, Offerings/Marketing <br />Uponor North America <br />� <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 LSN 1W1 <br />Tel: (888) 994-7726 <br />Fax: (800) 638-9517 <br />Web: www.uponor.ca <br />