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down staircases must be insulated with a minimum of R -30 fiberglass batt or some other suitable insulation. Weather -strip the trap door or attic scuttle. D. Weather strip kneewall access doors. Attic side of kneewalls must be air sealed and insulated to minimum R -13. E. Free circulation of air through suffix vents must be ensured either through the use of blocking materials or by removal of insulation from around the vents. Any pockets or voids in the insulation must be filled so that insulation is of a uniform R value. F. Venting of attic area must be consistent with established attic ventilation standards. Louvered vents will be assumed to have Net Free Area (NFA) of ventilation equal to one -half (1/2) the area of the vent opening, unless otherwise indicated and documented (such as a stamp on the vent package). Non - louvered vents will be assumed to have NFA of ventilation equal to the area of the vent opening, unless otherwise indicated and documented. Turbine vents with a 12 -inch throat diameter will be assumed to have NFA equal to 364 square inches. Turbine vents with a 14 -inch throat diameter will be assumed to have NFA equal to 432 square inches (in 2). G. Vents must be louvered and /or sealed to prevent rainwater from entering the vent opening. H. If wiring in the attic area appears unsafe due to cracked, blistered, or deteriorated wiring insulation, or if circuits otherwise indicate overloading, the attic shall not be insulated out of consideration for fire hazards until these situations are corrected. Such exceptions must be documented and the burden of evidence will lie with the Local Weatherization Service Provider. Attics containing knob and tube wiring shall be rewired and inspected by a licensed electrician prior to insulating. Ensure all electrical junction boxes are covered and marked prior to insulation. I. Cellulose promotes recycling and, when applied correctly, provides a better sealing effect in the attic area. Blown fiberglass may be used to insulate attics only with prior approval from the Weatherization Assistance Program. TASK 3: INSULATE SIDEWALLS Building permits must be secured, where required. A. Fill sidewalls to capacity using the dense pack method to a minimum density of 3.5 pounds per cubic foot. Anything less than a dense pack should be documented, ex. Weak walls that is packed as tight as possible. B. Only cellulose insulation shall be used, except that blown fiberglass may be used in a stud cavity adjacent to a chimney or other combustible. C. All walls between heated and unheated areas and all walls between heated areas and the exterior of the house must be insulated. D. Sidewall insulation must be installed either by removing exterior siding or by drilling holes from the interior of the house. E. Where incomplete sidewall insulation exists, insulation will be added to provide complete sidewall coverage. The sub - grantee must ensure that all exterior walls have complete sidewall coverage. F. Reasons for exempting walls must be documented, but in no case may any wall or cavity be only partially insulated. G. The following exceptions will be allowed, but must be documented, and the burden of proof will lie with the Local Weatherization Service Provider. 1. Existing sidewall insulation; 2. No wall cavity; 3. Knob and tube wiring present in wall cavity, and testing of the wiring indicate unsafe wiring exists and there are insufficient funds available to replace the wiring; 4. Interior and /or exterior wall too weak to withstand pressure of sidewall insulation; 5. Client refusal documented by signed agreement; 6. Existing moisture problems, which cannot be remedied. TASK 4: FLOOR INSULATION A. Floor insulation will only be installed under floors separating a heated area from an unheated area. Solicitation No. 2011 WXSSP Pape 9 of 53 Attachment number 1 F -4 Page 121