06:48PM | 11/07/04
Member Since: 10/19/04
3 lifetime posts

I am considering insulating my basement with Polyethylene sheet boards. I am wondering if anyone knows about its R-value or its thermal properties.



02:12PM | 11/09/04
Member Since: 06/23/04
161 lifetime posts
What you are refering to is POLYURETHANE insulation, not polyethylene. Polyurethane is also commonly referred to as simply "urethane" insulation. It has a very high initial R value of approximately 7.5 per inch, comes in foil faced sheets that are light weight and easy to install. This is a very good choice for retrofitting and remodeling. Because it covers large areas, it also performs well as an infiltration barrier. The sheets commonly come in thicknesses ranging from 1/2" to 1". Be sure to tape all the joints with a quality metalic tape( not duct tape) such as a SMACNA approved metalic duct tape available from wholesale air conditioning parts houses and some building supply stores. It is an expensive tape but you will recognize the quality with the first strip that you apply. The urethane sheets are relatively strong but must be completely covered with gypsum board or panelling and cannot be exposed to abuse or wear. Also, the urethane core will degrade when exposed to ultraviolet light (sun). Lastly, the R value degrades with time. Aged R values drop to around 6.0 per inch when in place for one to two years and exposed to high temperatures. This is still a much higher R value than most other insulations.

Good Luck
Click to reply button
Inspiration banner


Post a reply as Anonymous

Photo must be in JPG, GIF or PNG format and less than 5MB.

Reply choose button


Post new button or Login button

To test the boundaries of small-footprint living, interior designer Jessica Helgerson moved her family to a 540-square-foo... Filling an underutilized area beneath the stairs is a smart way to save space. Doing so with a stash of wood, however, is ... The Audubon Society inspired wallpaper in this Adirondack-styled mudroom will get you in the outdoor mood. Grab your coat ... Chalkboard paint opens up endless possibilities for customizing your dresser time and time again. Use chalk to label the c... A fireplace in the bathroom creates the ultimate setting for relaxation. Homeowners often choose electric or gas over wood... This roomy boot tray made from punched metal stands up to all the elements. Station it in your mudroom or at your back doo... There’s nothing like a new set of cabinet hardware to refresh a room. The possibilities are endless: Go modern, rustic, or... FLOR tiles are an affordable way to customize a carpeted floor covering for any space. Make anything from runners to wall-... Chalkboard paint features prominently in this elegant yet unpretentious headboard design. Add a new message daily to reflec... Salvaged boards in varying widths and colors make up the dramatic accent wall in this attic space. The high-gloss white of... The indecisive homeowner need not fret over choosing one (or even two) cabinet colors. The kitchen cabinets in this artist... Incorporate nature into your lighting scheme by securing a dead tree in a concrete mold and draping your pendant lamp from... Simple and striking, a couple of pieces of "lovingly used" furniture creates a special kind of charm. A weathered chair fo... First dress up your metal shelves with a coat of paint in an accent color that complements your kitchen decor. Then arrang... Dark wood shelving and a matching upholstered bench keep this closet sleek and refined. The large window brightens the sub...
Follow banner a
Newsletter icon Flipboard glossy Facebook Twitter Pinterest Youtube Rss icon