Breathable low-emissivity metalized sheets

A roof system in a building construction comprising a metalized composite sheet consisting of:

• a porous flash spun plexifilamentary sheet layer having first and second outer surfaces and at least one multi-layer coating comprising:
• an intermediate organic coating layer of a composition containing a cross-linked polyacrylate having a thickness between about 0.02micrometer and 0.5 micrometer vapor deposited on the first outer surface of said flash spun plexifilamentary sheet layer;
• a metal coating layer having a thickness between about 15nanometers and 200 nanometers deposited on said intermediate organic coating layer, said metal selected from the group consisting of aluminum, silver, copper, gold, tin, zinc, and their alloys;
• and
• an outer organic coating layer of a composition containing a cross-linked polyacrylate having a thickness between about 0.2 micrometer and 0.5 micrometer vapor deposited on the metal layer;
• wherein the multi-layer coating substantially covers the outer surface of the flash spun plexifilamentary sheet while leaving the pores substantially uncovered.

A wall system in a building construction comprising a metalized composite sheet consisting of:

• a moisture vapor permeable sheet layer having first and second outer surfaces, the sheet layer comprising at least one of consists of a polymeric composition and is selected from the group consisting of a nonwoven fabric, woven fabric, nonwoven fabric-film laminate, woven fabric-film laminate, moisture vapor permeable film and composites thereof, wherein the first outer surface of the moisture vapor permeable sheet layer is a porous sheet selected from the group consisting of microperforated films, woven fabrics and nonwoven fabrics;
• and at least one multi-layer coating on said first outer surface of the sheet layer, said multi-layer coating comprising:
• an intermediate organic coating layer of a composition containing a material selected from the group consisting of organic polymers, organic oligomers and combinations thereof, having a thickness between about 0.02 micrometer and 0.5 micrometers vapor deposited on the first outer surface of the moisture vapor permeable sheet layer;
• a metal coating layer having a thickness between about 15 nanometers and 200 nanometers deposited on said intermediate organic coating layer;
• and
• an outer organic coating layer of a composition containing a material selected from the group consisting of organic polymers, organic oligomers and combinations thereof, having a thickness between about 0.2 micrometer and 0.5 micrometers vapor deposited on the metal layer;
• wherein the MVTR of the composite sheet is at least about 80% of the MVTR of the sheet layer measured prior to depositing the metal and coating layers.

A wall system in a building construction comprising a metalized composite sheet consisting of:

• a porous flash spun plexifilamentary sheet layer having first and second outer surfaces and at least one multi-layer coating comprising:
• an intermediate organic coating layer of a composition containing a cross-linked polyacrylate having a thickness between about 0.02 micrometer and 0.5 micrometer vapor deposited on the first outer surface of said flash spun plexifilamentary sheet layer;
• a metal coating layer having a thickness between about 15 nanometers and 200 nanometers deposited on said intermediate organic coating layer, said metal selected from the group consisting of aluminum, silver, copper, gold, tin, zinc, and their alloys;
• and
• an outer organic coating layer of a composition containing a cross-linked polyacrylate having a thickness between about 0.2 micrometer and 0.5 micrometer vapor deposited on the metal layer;
• wherein the multi-layer coating substantially covers the outer surface of the flash spun plexifilamentary sheet while leaving the pores substantially uncovered.