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InsightHorizon Digest

What thickness polycarbonate should I use

Author

Emma Miller

Updated on April 19, 2026

If you’re using polycarbonate, we recommend a minimum thickness of 3mm for applications such as replacing shed windows to provide adequate security. If you’re replacing or installing greenhouse panes, you may want to opt for 4mm instead.

What thickness polycarbonate do I need?

We strongly recommend that you always opt for solid polycarbonate! For windshields with a sheet width of 3 feet, we recommend a sheet thickness of 8 millimeters or thicker, and for every 20 inches that the sheet is wider, the sheet must be 1 millimeter thicker.

How strong is 10mm polycarbonate?

300 hundred times stronger than glass and 30 times stronger than our Perspex® acrylic sheets, our clear polycarbonate sheets are shatter resistant, as well as long-lasting making them ideal for use in both indoor and outdoor projects.

What is the best thickness for polycarbonate roofing?

Polycarbonates are available in a variety of thicknesses, but the most ideal thickness that you can choose lies between the range of 4 and 6 mm. Anything lesser than that means low quality polycarbonate, which won’t help to serve you for longer.

How thick should polycarbonate be for a greenhouse?

As a rule of thumb, 8 mm and higher will do fine for any type of weather. If you don’t get many icy-cold nights or if you plan on heating your greenhouse throughout the cold season, you might be good with thinner panels. 4 mm thick panels are primarily used as a “season extender” not necessarily for year round growing.

How thick should polycarbonate be for a pergola?

Acme Plastics’ multiwall polycarbonate panels are lightweight and durable, ideal for pergola roof applications. Our most popular option is the 10mm (3/8″ thickness) twinwall polycarbonate panels in clear and bronze.

Is 2mm acrylic OK for greenhouse?

Maximum sheet size3050mm x 2050mmAvailable thicknesses2mm, 3mm, 4mm, 5mm, 6mm, 8mm, 10mmLight transmission92%Fire ratingUK class 4 fire rating

What are the disadvantages of polycarbonate?

The main disadvantage of polycarbonate is that it isn’t resistant to scratches. For example, if a branch should happen to fall on a patio canopy made of polycarbonate, it may be scratched. This problem can be solved by polishing the polycarbonate.

How thick are polycarbonate panels?

Today you can get polycarbonate sheets in 6mm (1/4”), 8mm (5/16”), 10mm (3/8”) 16mm (5/8”) and 25mm (1”). Sheets are available in clear, opal, bronze and specialty coatings. These specialty coatings provide properties such as diffused light.

How do you cut 10mm polycarbonate sheets?

Polycarbonate sheets can be cut with either a circular saw or a jigsaw. A circular saw is the best tool for cutting larger polycarbonate lengths. Thanks to the properties of this material, polycarbonate won’t crack or splinter around the cut.

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How do you cut polycarbonate Twinwall?

Use a marker pen, pencil or masking tape along with a straight edge such as a ruler to mark out where you’re going to cut the polycarbonate sheet. Slowly and carefully work your circular saw along your marked line, being careful not to stop once you start to ensure a clean, consistent finish.

What is the best thickness for greenhouse plastic?

When selecting a plastic greenhouse covering, you should choose a thickness of at least 6 mil. This is the benchmark standard set by the NCRS because it is meant to last 4 years or longer. There are other sizes available with more or less thickness, but 6 mil is the average thickness of a heavy-duty greenhouse film.

What is the best type of polycarbonate for a greenhouse?

Types of Polycarbonate Lexan is a top rated polycarbonate that is commonly used for greenhouses. It is made in the USA, and it has two flat sides that are plain and transparent, giving it a similar appearance as glass.

Do plants grow under polycarbonate?

Rigid polymer panels, such as polycarbonate, have become the standard in greenhouse installation over the last few decades. … Plants grown in greenhouses with polycarbonate glazing are less likely to burn, but may not grow as full or fast as plants grown under glass since there is less available light to photosynthesize.

Can you use acrylic sheet in greenhouse?

Acrylic sheets are perfect for use as greenhouse plastic, it is stronger than glass, which enables it to take much more damage. … Acrylic sheets are strong with an impact resistance being 6 to 7 times greater than glass.

Is polycarbonate better than acrylic?

Polycarbonate is the stronger material at 250 times the impact resistance of standard glass. Polycarbonate offers much more resilience than acrylic, making it ideal for highly demanding applications like bullet-resistant windows. … Acrylic is also easier to crack, while polycarbonate is easier to scratch.

Will plexiglass work for a greenhouse?

Getting Your Tools and Materials Ready! Tools needed to build a greenhouse. Covering / Glazing options – Choose from amongst the various materials to fit your needs and budget – for home-based DIY greenhouses we highly recommend Plexi Glass as the ideal covering choice!

Which polycarbonate sheet is best?

Multiwall polycarbonate provides the highest level of insulation when compared to single and twin-walled sheets. These sheets are available in up to 6 layers. These sheets require great initial investment, but it results in long-term savings on winter heating costs.

How thick should an acrylic shelf be?

If you’re planning to use acrylic to make a sturdy wall shelf, it’s advisable to use a sheet at least 10mm thick. But if you’re making closet shelving, a sheet 5mm thick will often be adequate.

What is the minimum pitch for a polycarbonate roof?

When installing polycarbonate roofing, keep a minimum pitch of 5 degrees so that rainwater runs off towards the gutter preventing moisture collecting on your roof.

How thick should perspex be for greenhouse?

When selecting your polycarbonate greenhouse sheets we recommend a minimum gauge of 3mm for adequate rigidity. This is because some customers have told us 2mm thick polycarbonate can be ‘too bendy’ particularly on larger panel sizes.

How wide are polycarbonate panels?

We stock most polycarbonate material in standard sheet sizes 48″ X 96″, 60″ X 96″, 72″ X 96″, 48″ X 120″, roll stock and more. There are many applications where the benefits of polycarbonate sheet can be utilized to enhance architectural designs. It is suitable for both internal and external glazing applications.

How strong is 6mm polycarbonate?

300 hundred times stronger than glass and 30 times stronger than our Perspex® acrylic sheets, our clear polycarbonate sheets are shatter resistant, as well as long-lasting making them ideal for use in both indoor and outdoor projects.

How long do polycarbonate sheets last?

Polycarbonate panels are resistant to extreme temperature either hot or cold, sunlight, snow, rain, and impact. This enables the panels to last for many many years without fading or discoloring while also remaining damage free from any various impacts over the years.

What is better PVC or polycarbonate?

Though not quite as effective as polycarbonate roofing sheets in resisting impact, the majority of PVC roofing sheets will remain intact in most cases of collision. Unlike polycarbonate sheets, however, PVC roofing sheets are usually scratch resistant.

How do you drill holes in polycarbonate?

Standard wood working drill bits are suitable for drilling holes in polycarbonate sheet. Be sure to use another piece of material (scrap wood or acrylic is perfect) underneath the panel to act as a backstop. This will ensure the drilling will not blowout the panel as the drill exits the material.

How do you drill holes in polycarbonate sheets?

Drilling holes in polycarbonate sheet You can use an ordinary iron drill or HSS drill bit to drill holes in polycarbonate. Position the drill perpendicular to the polycarbonate and run the drill at medium speed immediately. Don’t use too much pressure but let the drill do the work.

How do I stop polycarbonate greenhouse panels blowing out?

  1. Glazing repair tape on both sides of overlapping panes offers extra protection against wind.
  2. Foam tape helps make a better seal when the roof vent is closed.
  3. Make temporary repairs to damaged greenhouses to keep the wind out until you can buy replacement glazing.

Can you cut polycarbonate with a Dremel?

If the dremel is all you have, it will cut, but be careful about trying to hurry it along. The Rotozip Saber is the same blade, sometimes cheaper per bit.

Does polycarbonate scratch easily?

Like acrylic, polycarbonate has some cons to consider. It is typically not a shiny material, but it can be polished. Although it resists cracking and chipping, it dents and scratches easily.

What is the difference between 4 mil and 6 mil plastic?

1 MIL – Economical short term storage. … 4 MIL – Heavy duty protection when packaging nails, screws & heavy metal parts. 6 MIL – Extra heavy duty protection against punctures and tears on bulky items or items with sharp corners.