Laughable isn t a very quantifiable term.
Foil roof insulation reviews.
Found in major outlets such as in home depot s insulation aisle reflectix comes in tightly spooled rolls of 25 by 2 feet of shiny reflective foil look bubble wrap texture insulation in plastic bags.
Since the product often costs more per square foot than 1 inch thick rigid foam rated at r 5 why would anyone use bubble wrap as insulation.
Last week i received an email from a concerned reader who said his 85 year old mother in law had recently purchased a 2 500 radiant barrier insulation system for her 1 800 sf townhouse in austin mn.
The r value of foil faced bubble wrap is so low that it has few if any advantages over rigid foam.
When installing a foil type barrier it s important to allow the material to droop between the attachment points to make at least a 1 0 inch 2 5 cm air space between it and the bottom of the roof.
Currently the best foil insulation is the aes radiant barrier.
In fact a florida solar energy center study which compared different roofing materials with various venting ratios and with or without radiant barrier systems rbs found that a black shingled roof vented at 1 300 vent area to ceiling area with an rbs had a 6 1 reduction in attic temperature at design maximum summer conditions and a 26 4.
Wiki researchers have been writing reviews of the latest foil insulations since 2017.
A comparison review of multi foil insulation products superquilt thermaquilt sf19 triso super 10 tlx silver ybs insulation superfoil actis tlx.
A warning about radiant barriers aka foil insulation.
Foil faced plywood or oriented strand board sheathing is also available.