Extruded polystyrene foam board 1 inch thick 5.
Rigid foam insulation board r value.
That said the long term r values of this foam board decline over time.
Rigid insulation is usually made up of fibrous materials or plastic foams.
In severe cold xps panels do see an increase to their r values.
Expanded polystyrene insulation is similar to the foam used for packing peanuts and it s typically used for insulated concrete forms also knows as icf s.
Our r value guide to rigid insulation includes the doe s recommended insulation by zone chart r value calculator and base building material r values chart.
Polyisocyanurate foam board 1 inch thick.
The fibrous materials such as wood cane or vegetable fibers are mixed with fillers and binders to form insulation boards.
It is offered in multiple thicknesses and dimensions in both square edged and tongue and groove joints.
Rigid insulation r value by comparison usually ranges from r 4 0 to 6 5 and may get as high as r 8 7 depending on the insulation material.
Insulfoam rigid foam is a high performance built to spec sheathing insulation that provides superior r value and moisture resistance.
Rmax r matte plus 3 1 2 in.
Expanded polystyrene foam board 1 inch thick 3 8 4 4.
It s made of environmentally sound closed cell polyisocyanurate foam bonded to a durable white matte non glare aluminum facer and a reflective reinforced aluminum facer.
For example after just 5 years an xps board will see its r value fall by 10 and even more going forward.