What Is The R Value Of 6 Mil Plastic

Make the most of the variety of uses of the husky 6 mil heavy duty clear plastic sheeting.

What is the r value of 6 mil plastic. 18 3 6 x 100 600 increase in r value. Back then and even today its greatest asset is its price. 6 mil plastic poly sheeting. In my opinion increasing r value to reduce the rate of heat loss in a roof is entirely and only theoretical.

Typically a single layer of polyethylene film has an r value of approximately 0 85. I m about to start building a home in michigan s upper peninsula in zone 7. 1 grain of water vapor will pass through 1 square foot of the material when the moisture vapor pressure difference between the colder side and the warmer side. This husky plastic sheeting is easy to trim to any size to accommodate your needs.

By the time 1970 arrived uv inhibitors were added to give the plastic a longer life span. When selecting a 6 mil greenhouse plastic you need to make sure it is not a product out of china. If the effective r value of the original assembly was higher your. If you have pulled your sheet of plastic taut but with a layer of still air between the plastic and the window then you have replaced an air pane assembly with a total r value of about 1 2 with an air pane air plastic assembly with a slightly higher r value perhaps 1 9.

However moving right along to viewpoint 2. 6 mil plastic is economical. In the 1960 s 6 mil polyethylene sheeting emerged on the scene for hoop house style greenhouses. It comes in a variety of thicknesses with 6 mil being very common.

Therefore double pane is the better more efficient choice for a greenhouse glazed with glass. 6 mil plastic could survive the sun for up. My inspector just came back from a training session with the impression that michigan code requires a 6 mil plastic interior. The following are some examples of material comparisons.

The actual change in rate of heat loss through the roof will be most likely a lower percentage as heat loss is affected by. Single paned glass has an r value of 95 compared with a double pane which is 2 0. To convert this si unit to an imperial value we need to divide the si thermal conductivity by the conversion factor of 1 7307 when we do this we find that the imperial thermal conductivity is 46 1 7307 26 to 52 1 7307 30 btu hr ft f. I planned for r 40 walls with cedar shingles over cedar breather over 15 felt over osb over 1 1 2 exterior polyiso board over 8 inch studs filled with blown in fiberglas and air sealed drywall.

It is made of eco friendly recycled plastic which makes it an environmentally friendly solution. Typically a single layer of polyethylene film has an r value of approximately 0 85. Now we can calculate the inverse to determine the true r value. Perm is a quantitative value that measures the relative ease with which moisture water vapor will pass through a material.

A double poly cover consisting of two layers of poly has an approximate r value of 1 25. A perm rating of 1 0 for any material is defined as follows. The r value ratings give you a specific method of evaluating and comparing different materials for your greenhouse.