Under Roof Reflective Insulation

Standard insulation products do not make claims based on the assembly.

Under roof reflective insulation.

This highlights a key problem with reflective products. Radiant barriers and reflective insulation systems work by reducing radiant heat gain. Fiberglass roof insulation works like a blanket spread over your house keeping thermal energy out during the summer and keeping the heat in during the winter. The protection provided by a reflective barrier under a roof will degrade over time as dust accumulates on the shiny surface.

Convection conduction and radiation. 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. Dust accumulation on the reflective surface will reduce its reflective capability. It will help you to eliminate problems that may come when the house becomes extremely cold in the winter and terribly hot in the summer.

To be effective the reflective surface must face an air space. The radiant barrier should be installed in a manner to minimize dust accumulation on the reflective surface. Performance claims are based on an assembly including an air gap and the perfectly shiny surface when the product is installed. In order to add moisture barrier under metal roof you can spray the undersides of the roof by using a thick layer of polyurethane spray foam.

Polyurethane spray foam metal roof insulation. Low e reflective insulation resists all three types of heat transfer. It greatly reduces attic heat gain making this space more usable and the rest of the house cooler.