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(Con‘t from RE 27) installed properly and to the optimum density. The typical thermal resistance values for blownâ€" in, looseâ€"fill mateâ€" rials: Many varieties are available LOOSEâ€"FILLED (POURED) INSULATION Poured looseâ€" fill insulation is a good selection for accessible attics with irregular spaces or nonstanâ€" dard distances beâ€" tween joists. It can also be poured into enclosed wall caviâ€" ties that are open at the top, but the cavity must be perâ€" manently filled. It R/in. cellulose fibre 0.025 â€"3.6 glass fibre 0.020 2.9 mineral wool 0.021 3.0 manently filled. It is not appropriate for use below ground level. Poured insulation should be installed according to the manufacturer‘s recâ€" ommendations printed on the bag. Poured looseâ€" fill insulation comes in a variety of materials. Cellulose fibre has the highest thermal resistance per unit thickness, but tends to settle. RSI/mm Vermiculite is nonâ€" combustible and pours more easily into irregular wall cavities than other looseâ€"fill materials. However, it may absorb moisture quickly and it dries out slowly (the Block Fill brand contains asphalt and does not absorb moisture). Mineral wool is nonâ€"combustible and tends to settle. The _ typical thermal resistance values for poured looseâ€"fill insulation materials: cellulose fibre 0.024 _ 3.4 glass fibre 0.021 3.0 mineral wool 0.022 3.2 vermiculite 0.016 â€" 2.3 R/in. Rigid _ board insulation is made from glass fibre or a variety of foam plastic materials. Its thermal resisâ€" tance values can be higher than those of batt, blanket and looseâ€"fill insulaâ€" tions, but the cost per RSI (R) value usually is higher. Rigid _ board insulation is lightâ€" weight and easy to cut and handle. RIGID BOARD INSULATION RSI/mm Available in a variâ€" ety of thicknesses, it performs best on regular, even surâ€" faces. Specific applications vary by material but all rigid board insulaâ€" tions is ideal for use on flat or lowâ€" sloping _ roofs, either during conâ€" struction or when an existing roof is being replaced. In certain cirâ€" cumstances, rigid board insulatio | (except glass fib.: and phenolic) can perform as vapor barriers. _ Rigid board materials can also be fire hazards if not properly covâ€" ered and should be protected from exposure to sunâ€" light and solvents. Ask your supplier for the manufacturâ€" er‘s literature on handling and ins t a 11 a t i 0 n requirements. Glass fibre board is available in a variety of denâ€" sities and with speâ€" cial finishes. It is more compressible than other rigid board insulation, so exterior finish materials must be applied carefully. This insulation can be used on roofs, ceilings, floors, ducts and pipes, and on interior and exterior faces of walls above the below grade. A lightweight material, lowâ€"denâ€" sity expanded polystyrene can be used to insulate roofs, ceilings, and interior face of walls above and below grade, and the exterior face of walls above grade only. In addition to possessing all of the characteristics and applications of the lowâ€"density variety, mediumâ€" density expanded polystyrene is relaâ€" tively moisture resistant and can be used below grade on the exteriâ€" or face of walls and under concrete slab foundations. E x t.r ud e. d polystyrene board (See Page RE 35) Big Sisters Association or call 1â€"800â€"461â€"BSAO For further information contact your local Support Big Sisters or become a Big Sister. io Sisters