These are the only differences I can make heads or tails from it.
Please advise on any new information that might have lapse me.
Always open to learn new things about products of my everyday usage.
From this Old House;
Option: Install a clear polyethylene vapor retarder
Most plastic barrier films are either clear polyethylene, black polyethylene,cross-laminated polyethylene, or reinforced polyethylene.
The most basic ofthese materials, clear polyethylene, is also the most economical. Available in4-, 6-, and 10-mil thicknesses, it is best suited for interior wall applicationsover framing and insulation.
As clear poly’s content is up to 80 percent “reprocessed” material,it is also an environmentally sustainable choice.
The high recycled contentcomes at a cost: its quality can be uneven and it generally has poor tear andpuncture resistance.
Clear poly should never be used for exterior applicationsor applications with more than limited exposure to sunlight.
Clear poly isavailable in widths of 4 to 32 feet in 100-foot long rolls. As with allpolyethylene vapor retarders, for horizontal application over wood framing,staples are most often used. For maximum effectiveness, joints should be kept toa minimum and seams should be lapped and taped.
ADVANTAGES
Relatively inexpensive and easy to install. In more severeheating climates, the use of interior polyethylene films is most effective andis practical where interior finish surfaces are removed. Being transparent,attachments to framing members are simplified, as is the installation ofwallboard material over the polyethylene, because the studs are visible.
DISADVANTAGES
Limited tear and puncture resistance. Clear poly must beinstalled with care to avoid damage. All penetrations such as electricaljunction boxes must be taped and sealed to ensure effectiveness.
Clear poly canbe used only in instances where wall finishes and surfaces have been removed,fully exposing wall framing.
Option: Install a black polyethylene vapor retarder
Black polyethylene is nearly identical to clear poly, except for the additionof carbon black to the composition as a Ultraviolet inhibitor.
This permits theuse of the polyethylene where some limited exposure to sunlight is required,such as at exterior wall surfaces.
Black polyethylene strength characteristicsare similar to clear poly, with low tear and puncture resistance.
ADVANTAGES
For exterior wall surface applications in hot, humid, coolingclimates, black UV protected poly films can provide superior vapor retarderperformance.
DISADVANTAGES
Limited tear and puncture resistance. Unreinforced black polymust be installed with care to avoid damage.
Its opaque nature makesinstallation more difficult by obscuring underlying framing, sheathing, andother components. Joints and seams must be lapped and taped for fulleffectiveness. Installation is limited to conditions where siding has been fullyremoved and attachment directly to exterior sheathing can be made.
Option: Install a cross-laminated polyethylene orfiber-reinforced polyethylene vapor barrier
Compared with standard polyethylene, high-density cross-laminated poly andfiber-reinforced poly are both specialty products manufactured for applicationswhere higher strength is required.
For retrofitting over rough, irregularsurfaces, such as solid board sheathing, both products would be less susceptableto tearing or puncture by lifted nail heads, splinters, or exposed sharp corneredges.
Either product would also be appropriate where rough handling and adversesite conditions are expected.
ADVANTAGES
Stronger than standard poly, reinforced and laminated materialcan withstand more adverse site conditions and rough handling. The reinforcedand laminated products are typically rated for limited UV exposure for exterioruse and situations where the installation of siding and coverings is delayed.Black reinforced and laminated poly can be used as the required weather barrierunder exterior siding and cladding.
DISADVANTAGES
Higher initial cost compared to standard black poly.Application is limited to conditions where siding and exterior wall coveringshave been removed. Seams must be lapped and sealed for full effectiveness.
Glad to hear about addittional pros and cons.:)