What are two disadvantages of foam insulation?
• A roll of visquene is 8 x 100 feet. Assuming there are no overlaps (in reality there are). How many rolls of visquene are necessary to put a vapor barrier in a house 24 x 36 , with walls 8 high. The outside walls and ceiling need a vapor barrier. How many square feet will be left over for overlap and other purposes? Three rolls. 72 linear. ft. or 624 square feet left over. • The above house needs _______ square feet of visquene. It comes in rolls of 12 x 100 for $47.21 or rolls of 8 x 100 for $29.52. What is the best combination of rolls that can be purchased and what is the total cost? The best combination is 1 roll of 12 wide and 1 roll of 8 wide. Total cost is $76.73. • Two inches of foam has an R factor of 10. Six inches of fiberglass has an R factor of 19 (round off to 20). A piece of foam is 2 x 8 and costs $14. Fiberglass costs $37 for a roll that contains 78 square feet. Which is the better insulation buy for a square foot? Foam is $.857 per square foot, giving an insulating
