R Value Plastic Sheet

Polycarbonate 16mm triple wall r value is 2 5.

R value plastic sheet.

75 in the often requested 16mm multi wall light transmission drops to around 64. It is the ability to maintain thickness as the material is drawn. Polycarbonate 6mm twin wall r value is 1 54. For some sheet materials however the r value varies with the applied axial strain.

In construction the r value is the measurement of a material s capacity to resist heat flowfrom one side to the other. R value measures how well certain building insulation materials can resist heat. In the case of a greenhouse application that 10 can have an effect on plant growth. Polycarbonate 8mm twin wall r value is 1 69.

Polycarbonate 8mm triple wall r value is 2 0. This is a metric based si value. R value 1 6 light transmission. 10mm thick twin wall polycarbonate.

Civil engineering and architecture r value and densities chart page 1 r value and densities chart material r value per inch r value per unit inside air film 0 68 air space between studs 0 95 building paper 0 06 in. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation. R value 1 9 light transmission. The r value the plastic strain ratio of sheet metal intended for deep drawing applications is a measure of the resistance to thinning or thickening when subjected to either tensile or compressive forces in the plane of the sheet i e.

The higher the r value the greater the insulation performance. However engineering texts and plastics industry manuals list thermal conductivity is in the range from 46 to 52 w m k. Twin wall polycarbonate has an r value of 1 54 while five wall polycarbonate has an r value of 3 2 making the five wall polycarbonate the best choice for greenhouse glazing. For instance if you have a material with an r value of 12 attached to another material with an r value of 3 then both materials combined have an r value of 15.

For many materials the r value remains constant over the range of plastic strains up to the maximum force applied to the specimen. Note that by adding 40 to the thickness of the material you gain only 15 r value thermal insulation yet you lose 10 light transmission. Fiberboard sheathing 1 52 gypsum wallboard or drywall 0 90 osb particle board low density 1 41. 0 125 vinyl composition tile vct 0 200 1 60.

When determining how much insulation you need don t guesstimate calculate. Know exactly how much you need with our project calculators. Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior air film again no air movement r 0 68 3 4 of reflective air space no convective air movement r 2 89 1 2 drywall r 0 45 interior wall.