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Sprayfoaming ?

  • 22-09-2015 6:20pm
    #1
    Jim1000
    Banned (with Prison Access) Posts: 107 ✭✭


    hello folks,

    I am renovating an old bungalow. Rafters are 6 inches in new section which will be a dormer bedroom. They are 4 inches in old section which may be used for more than storage in the future.

    I have gotten a few sprayfoam quotes. One contractor says vent cards are necessary which are 2 inches in depth. This would mean only 4 inches of insulation in the dormer room.
    Another contractor says that really the cards are necessary only on the old black felt and as I have new breathable felt it's better to spray the rafters full for more insulation.

    Not sure what to believe at this stage and wonder if anyone had a full rafter spray done and if it has any negatives.

    Thank You


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