R Value Of Plastic Sheets

When determining how much insulation you need don t guesstimate calculate.

R value of plastic sheets.

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. For many materials the r value remains constant over the range of plastic strains up to the maximum force applied to the specimen. R value 1 9 light transmission. In the case of a greenhouse application that 10 can have an effect on plant growth.

For some sheet materials however the r value varies with the applied axial strain. Double glass five wall greenhouse heat insulation polycarbonate r value single glass thermal. 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. However engineering texts and plastics industry manuals list thermal conductivity is in the range from 46 to 52 w m k.

0 125 vinyl composition tile vct 0 200 1 60. High density polyethylene is not commonly used for thermal insulation therefore you will not find published answers in r value. Just remember that the higher the r value number the more heat efficient is the material. R value is expressed as rate of heat loss per hour per square foot per inch of thickness of material per deg.

This is a metric based si value. Know exactly how much you need with our project calculators. Windows and horizontal skylights plexiglas glazing. F see r value definition at definitions of r k u values for some building materials such as sheet flooring we give an r value for a specfic thickness other than the standard 1.

Double glass layer r value is 2 0. As we said before the r value measures the thermal resistance of a material. Fiberboard sheathing 1 52 gypsum wallboard or drywall 0 90 osb particle board low density 1 41. 75 in the often requested 16mm multi wall light transmission drops to around 64.

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. 10mm thick twin wall polycarbonate. R value measures how well certain building insulation materials can resist heat. Polyethylene single film r value is 87.

Polyethylene double 5mm film r value is 1 5. Acrylic twinwall r value is 1 82. Double glass layer low e r value is 2 5. The values tabulated below are u factors for vertical.

Fiberglass glazing single layer r value is 83. The higher the r value the greater the insulation performance. R value 1 6 light transmission.