Division 22 23 Ebook Page 76 FOAMULAR XPS Pipe Insulation Installation Guidelines

Pub No. 10013974-B. Rev. 6/2016 Page 7 of 24 FOAMULAR XPS Pipe Insulation Installation Guidelines 9. For factory applied facing systems, apply the vapor retarder tape around the butt joint overlap per the manufacturer's installation directions in the appropriate orientation as noted above. (Figure 6, Appendix A) 10. Elbows and fittings shall be wrapped with vapor retarder tape or covered with a mastic type vapor retarder product. Vapor retarder tape shall be wrapped in a spiral configuration. If using mastic type vapor retarder at fittings and elbows, form mastic so that fitting covers can be applied true and tight. 11. Polyurethane foam filled fittings are not acceptable. D. Double Layer Systems (Systems with insulation thickness of greater than 2-1/2".) Note: In addition to the specifications outlined in the General section above, the following specification shall be followed for double layer systems. 1. Stagger all longitudinal and butt joints between the inner and outer layers. Install the inner and outer layer longitudinal joints perpendicular to each other with the inner layer joints in the 12 and 6 o'clock positions and the outer layer joints in the 3 and 9 o'clock positions. All butt joints between the inner and outer layers shall be staggered between 6 and 18 inches. (Figures 10, Appendix A) 2. Inner layer shall not be installed with sealants. The inner and outer layer shall remain independent of each other so as to allow movement between the layers. (Figure 10, Appendix A) 3. Insulation shall be secured with fiber-reinforced tape on both inner and outer layers except as noted above for factory applied facings. 4. Install nested half and full pipe half-round sections in bottom of saddle or use a full thickness single layer pipe section with shiplap ends cut to the depth of the inner layer thickness so the outer layer will overlap. (Figure 11 & 12, Appendix A) 5. Bottom insulation sections in hanger saddles may require higher compressive strength material such as FOAMULAR 400 or 600 Insulation. Consult the designer or engineer for proper load calculations and saddle spacing to determine proper material usage. 6. Saddles shall wrap the insulation in an arc of no less than 120 with the maximum wrap depending upon the load. 7. All fittings shall be cut to full thickness with fabricated shiplap butt ends. The depth of the shiplap shall be cut to the match the thickness of the inner layer. (Figure 13, Appendix A) 8. Insulation and vapor retarder shall be secured with fiber-reinforced tape. Use a circumferential overlap on 12" centers when installing insulation with factory applied facing. 9. Fiber tape shall be applied to the exterior of the insulation/vapor retarder system. 10. Vapor retarder should be oriented such that the longitudinal lap joint overlaps facing downward at either the 3 or 9 o'clock position. Lap joint shall be sealed using SSL tape or liquid adhesive. (Figure 6, Appendix A)

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