I understand r-values and all that stuff. That said an insulation person inspected my house and noted that the underside was not insulated (my house sits off the ground about 3 feet. He suggested foam insulation and quoted me $1.50 per square foot for a cost of about
1500 to do the job. My question is that on the web there are plenty of spray on foam insulation products with DIY equipment. Seems a simple enough job.Is this something that can be done by one's self? If so which product would you recommend?