SIPs$7–$12 per square foot *SIPs come as a complete unit of around 4-inch thick insulation between plywood or OSB, so this price covers the whole thing, not just one inch thick of insulation. Note that all foam types are sold and rated by the board foot, which is 1 square foot of...
but the full range is$1 to $7a square foot fully installed. Several factors influence the final cost per square foot, including the insulation type, whether the attic is partially insulated, and how accessible the various areas are.
Below are the average costs per square foot to build an addition, based on the cost of labor per square foot of construction. Keep in mind these costs are for the construction only, so do not multiply these costs by the total square footage for total labor costs. It is also important ...