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question about attic insulation and R value?

This is actually a two part question.I have a walkup attic that will eventually be finished when I get the timeCurrently inside the attic there is insulation on the floor joists but nothing along the roof raftersEssentially it's a triangle with insulation only at the bottomAnyways the roof rafter measurement is a 2x6 spaced 16 on centerThe highest r value I can find that will fit is R19Now I know it should have a higher r value but that will not allow me to finish it offDo you think r 19 would be better than nothing or should I not even bother and save my moneyBlown in is currently not an option.Second question: I have ridge and soffit ventsI know I need to use baffles, however the salesman at Lowes told me I only need them at the top of the rafters where the vent is and just one on each side where the soffit is and not the entire length of insulationIs this true? The rafters are about 14 feet in length where the baffle measures at about 4 feet.

Answer:

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Hello Fraz You already asked this question in different wording and I answered itI stress again: Do NOT fill the space between the roof rafters completely with insulationThere MUST be air flow between the roof boards and teh insulationIf there is no air flow, moisture will build up in the insualtion and cause the roof rafters to rot and also could cause moldBoth will end up costing more money than you would ever wish to spend and create a health and safety problem as wellMy answer: You MUST leave a space between the insulation and the roof fro cross ventilation Do NOT cover the ridge vent or completely fill in the space between the rafters There should be vents in the soffitThe air must be able to flow from the oiffit vents to the ridge vents This cross ventillation also helps to keep the roof a little cooler in the summer which will extend the life of your roofing material Without this space, the insulation will eventually become moist and loose its insulation value and will contribute to other problems such as wood rot and mold You can nail 1 X 2 strapping to the roof raftersNail flat against the roof rafters and tight to the roof boardsThis will give you a 1 1/2 inches space from the roof boards to the lower edger of the 1 X 2 strapping Place house wrap across the roof rafters by stapling it to the 1 X 2 strapping edgeThe house wrap can wrap around the roof rafters or you can cut it in strips so it fits between the roof raftersFill the remaining space with the proper size of insulationIf there is 3 1/2 inches from the edge of the 1 X 2 to the inside edge of the roof rfter, use insulation batts that are 3 1/2 inches; no thicker, no thinnerYou want the space fill completely without pushing the house wrap into the rir space.
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