Bob's A-Frame Greenhouse — You can build a greenhouse like this, too!

Northern Greenhouse Sales Inc.

- product help -

Choosing the Right Poly

Wondering what kind of poly to use for your new project? Use our guidelines below to take some of the guesswork out of it.

Gardening and Greenhouses

For light-loving flowers and most food production, especially with high light plants like tomatoes, peppers, cucumbers and melons, use 10.5 mils clear poly. They allow in maximum light for your plants while evenly distributing the light so you don't have to worry about hot spots. Use 11 mils in areas with strong sun and/or snowloads.

For plants that require a little less light like lettuce, ferns and orchids, use 11 mils or 12 mils clear poly. These polys are best for areas with high temperature climates like Arizona, Texas and Southern California, and areas with large snowfall in the winter. Use 11 mils clear in low light cloudy climates or 12 mils in hot sunny climates.

Pond Liners

To line the bottoms of your fish ponds etc. we would suggest using 12 mils or 24 mils black/silver poly. Very durable, it also blocks light from the soil below the pond liner, preventing grass, moss, etc. from trying to grow under the liner.


If you're looking for barn curtains, tarps, sheds, covers for grain, woodpiles or your machinery, or poly for a barn or shed roof or poly mulching use one of our black/silver or colored polys. 12 mils black/silver poly is, overall, our most popular colored poly as it is lighter weight, but still keeps the sun off/out and very durable. For much heavier jobs though you can also use 24 mils black/silver.

To keep light and heat inside barns during the winter a good poly is our 24 mils White/White poly. White on both sides it will reflect light and heat inside of any structure.

If you have any further questions about your project or which poly to use
please feel free to contact us for assistance.

Before Ordering: Please see our Vital Measurements chart for important ordering and measurement information.

Need help with PDFs?

Home | About Us | Products | Projects & Ideas | Catalog | Request Sample | Order | Testimonials | Contact Us | Privacy Policy | Delivery Policy