By Richard in Malabar, FL on 6/12/2006
I am in the planning stage in Malabar, Florida, working with a plan designer.
Recently I heard of the Icynene product, which is blown onto the underside of the roof sheathing, thereby lowering the heat of the attic. The concept of moving the insulation closer to the source of intrusion makes sense to me, as opposed to insulating the ceiling in the attic.
I am building a single-story home, of block construction and trusses.
Some local sources do not like the Icynene product because they claim that it causes premature deterioration of the roofing, owing to the lack of uninsulated space in the attic which would otherwise dissipate heat absorbed by the roof.
It is my intention to use roofing with the highest possible albedo (reflectivity).
The metal roof solution is very costly, compared to dimensional shingle that are very light in color.
I have looked on the web for case studies in a hot climate to verify, one way or the other, that Icynene does or does not degrade shingle prematurely, and that the metal roof is the only solution to this (other than replacing a shingle roof much more often).
I would really appreciate hearing from someone who can shed light on this dilemma.
Thanks in advance.