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For every inch of rigid foam board, you typically get an R-value of 4, so 2 inches would have an R-value of 8. The foam board is light and shouldn't affect the garage door opener.
The average cost of home insulation is between $3,000 and $10,000 for a 2,000 square foot home or between $1.50 and $5.00 per square foot. Average Costs for Home Insulation ...
I use foam insulation. I’ve seen it come in 2-inch diameters (maybe a special order is required), which would have been the right size for the pipes in the heating system in our old house.
The Family Handyman on MSN7d
How to Finish a Basement Wall
Tip the wall into place and fasten with concrete nails or screws. Pro tip: You need shims only about every third joist, but ...
This wall insulation system consists of four simple panels made from 1-inch-thick rigid insulation board. Your local fire codes may require rigid foam insulation to be covered with 1/2-inch gypsum.