Caution while comparing quotes. Make sure you are comparing apples to apples. Different R-values, or products could be the difference especially for spray foam. Pricing on Spray foam will be greatly affected by the type of foam you’ve been quoted. For example: A 2lb medium density product such will be a higher price than a 1/2 lb low density product. Insultech can provide an estimate on both products. We also include everything in our estimates to give you a 100% complete job. Extras will only be added on at your request, other than that the estimated price is the end price.