AG 2011 06 20 - Laserfiche WebLink

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B. Floor insulation with an R value of 19 will be installed unless prohibited by the depth of the floor joist; however, insulation will have an R value of no less than 11. C. Insulation will have an attached vapor barrier and will be installed with the vapor barrier towards the heated area. D. A three (3) inch clearance from heat producing devices will be maintained. Floor insulation will be installed up to and folded onto band joist or joist header. Insulation will be fitted tightly around cross bracing and other obstructions between floor joists. E. All floor insulation will be securely fastened to the floor joists so as to prevent sagging of the insulation. Staples will not be allowed as fasteners for floor insulation. Suggested fasteners are chicken wire or wire staves. F. Where floor insulation is installed over a crawl space and no foundation wall or underpinning is present, insulation must be protected from vermin, and /or other items that may destroy the insulation. This protection should be done with chicken wire or some other vapor permeable material. G. Where floor insulation is pre existing, no insulation will be installed except to replace damaged insulation. H. Installation of foundation vents is prohibited except to provide for combustion air appliances. TASK 5: INSULATE DUCTS /HEATING PIPES A. Only ducts or pipes located in unheated areas will be insulated. Return and supply ducts /pipes must both be insulated. 1. Where ducts or heating pipes are located in unheated areas with plumbing, provisions must be made to hinder the freezing of plumbing pipes prior to insulation. 2. If a basement has a zonal pressure no higher than 10 Pascals with reference to the house, then the basement may be considered "inside ", and duct insulation is not required. B. Ducts will be insulated with mineral fiber insulation, bubble wrap insulation or two -part foam with an R value of (6) or greater. Hydronic heating pipes will be insulated with either rigidly closed cell vinyl foam or mineral fiber insulation manufactured for the purpose of insulating pipes. When using mineral fiber insulation, a vapor impermeable wrapping must be applied on the outside of the insulation. C. Ducts and heating pipes must not be insulated within three feet (3 -ft) of the furnace exhaust stack. D. Insulation joints will be tightly butted or overlapped so as to completely surround ducts and pipes. An exception to this will be the case of ducts attached to joists, floors or some other obstacle, which prevents wrapping. In this case, insulation will cover the part of the duct exposed to the winter cold side and will be attached to the barrier if possible. Insulation joints will be taped completely with aluminum tape or some other appropriate permanent fastener. E. Where insulation is applied on rectangular ducts, insulation installed on corners will not be compressed more than 50% of its normal thickness. F. When ducts and pipes are not completely accessible, all accessible ducts and pipes must be insulated. TASK 6: GENERAL HEAT WASTE A. Weather- stripping, caulking, glass patching and insulation for plugging: These low -cost activities target comfort complaints and can be used only after blower door - guided air sealing is completed. B. Water heater insulation /pipe insulation C. Water heaters will be insulated with mineral fiber insulation with a protective backing attached or bubble wrap insulation with an R value of five (5) or better will be used. Insulation will be applied with the protective backing toward the outside. Please note: 1. ELECTRIC WATER HEATERS: Insulation will be applied to the top and sides of the water heater. The overlapped ends of the protective backing should be sealed, and banded in order to provide an adequate seal. Pressure relief valve shall not be covered. Access panels to thermostat shall be clearly marked. Solicitation No. 2011WXSSP Page 10 of 53 Attachment number 1 F -4 Page 122