R Value Plastic Sheet

The higher the r value the greater the insulation performance.

R value plastic sheet.

The following is a chart showing the r value of various materials for greenhouse use. 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. When determining how much insulation you need don t guesstimate calculate. Polycarbonate 16mm triple wall r value is 2 5.

R value 1 9 light transmission. R value 1 6 light transmission. Polycarbonate 6mm twin wall r value is 1 54. 0 125 vinyl composition tile vct 0 200 1 60.

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. 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. It is the ability to maintain thickness as the material is drawn. 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.

Polycarbonate 8mm triple wall r value is 2 0. 10mm thick twin wall polycarbonate. Know exactly how much you need with our project calculators. In simple terms r values measure the effectiveness of insulation and a higher number represents more effective insulation.

Fiberboard sheathing 1 52 gypsum wallboard or drywall 0 90 osb particle board low density 1 41. In construction the r value is the measurement of a material s capacity to resist heat flowfrom one side to the other. For such materials you should report the as tested strain level. High density polyethylene is not commonly used for thermal insulation therefore you will not find published answers in r value.

However engineering texts and plastics industry manuals list thermal conductivity is in the range from 46 to 52 w m k. 75 in the often requested 16mm multi wall light transmission drops to around 64. This is a metric based si value. R value measures how well certain building insulation materials can resist heat.

For some sheet materials however the r value varies with the applied axial strain. 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 many materials the r value remains constant over the range of plastic strains up to the maximum force applied to the specimen.