Insulation is one of the most important aspects of energy efficiency in a home. R40 insulation is a type of insulation that has a high R-value, meaning it is very effective at insulating your home. Insulation4US.com offers a wide selection of r40 insulation products to choose from, making it easy to find the right product for your needs. We also offer free shipping on all eligible orders, so you can be sure you are getting the best possible deal.