Greenhouse Tarp: How to Choose the Right Cover

A greenhouse tarp is a flexible cover used over a greenhouse, tunnel, nursery structure or temporary plant-protection area. Some are translucent and let useful daylight through; others are opaque and used for blackout, weather protection or shade. Being waterproof does not, on its own, make a cover suitable for growing plants. Here is how to choose well.

Six checks before you buy a greenhouse tarp

1. Material and construction

Check the base material, any coating or lamination, thickness or weight, edge reinforcement and attachment points. Reinforced edges and evenly spaced eyelets spread tension, but they must suit your frame and fixing system. Confirm whether the cover is rated for temporary, seasonal or longer outdoor use.

2. Light transmission and diffusion

Clear covers pass more direct light, diffusing covers spread it, shade covers reduce it and opaque covers block it. Do not assume “clear” means a known transmission figure: ask for measured data, and ask whether it changes with colour, thickness or coating.

3. UV protection

UV stabilisation slows brittleness, yellowing and weakening, but it is not an unlimited-life guarantee. Ask what UV treatment is included and what exposure it assumes. Equatorial sun at altitude is demanding on any plastic.

4. Size, shape and fit

Measure length, width, height, roof profile, end walls, doors, vents and fixing allowance. Too small leaves gaps; too much loose material flaps, chafes and collects water.

5. Weather and ventilation

Think about wind, heavy rain, hail and temperature swings. In windy sites, spread tension and inspect edges after storms. A waterproof sheet that seals the vents will trap heat and humidity, so plan ventilation separately.

6. Installation and maintenance

Remove or pad sharp edges, centre the sheet and fix it progressively so no single corner carries all the force. Afterwards, check for loose fixings, water-holding wrinkles, rubbing points and gaps.

Greenhouse tarp vs greenhouse film

Greenhouse film is a purpose-made protected-cultivation cover with documented thickness, UV life and light or thermal properties, designed for planned replacement. A tarp suits flexible, removable or temporary protection, or a quick repair while a permanent film system is not ready. If your crop depends on predictable light and heat, film is usually the better choice.

Greenhouse tarp vs shade net

Shade net is a knitted mesh that cuts sunlight while keeping airflow. It is not a waterproof roof. Shade nets are available from about 30% to 95% shade rate, in a range of widths and roll lengths. A common approach is a weather cover first, with shade net added when the crop or season needs solar control. See our crop protection solutions.

Greenhouse tarp vs ordinary waterproof tarp

Ordinary tarps are made to protect vehicles, equipment or materials. They are often opaque, have no light data and do not account for greenhouse temperature, airflow or crop needs. Use them only for short, non-growing protection unless the supplier can confirm light behaviour and UV treatment.

How to install a greenhouse tarp securely

1. Measure the full structure, including overlaps, doors, vents and end walls.
2. Inspect the frame and pad or remove sharp contact points.
3. Lay out the cover and confirm which side faces out.
4. Centre the sheet before fixing the first edges.
5. Use compatible fasteners and spread tension around the structure.
6. Keep vents and doors usable.
7. Recheck after the first wind or rain and correct rubbing, pooling or loose fixings.

Maintenance checklist

• Inspect regularly and after storms for tears, worn edges, loose fixings, pooling and abrasion
• Clean only as the manufacturer recommends; dirt cuts light, harsh tools damage coatings
• Store removable covers clean, dry and out of the sun
• Record the installation date and severe weather events

Frequently asked questions

Can I use any waterproof tarp on a greenhouse?

No. Waterproofing says nothing about light transmission, UV protection, ventilation, fit or outdoor life.

Is a clear tarp always best?

No. Clear covers suit crops that need daylight. Shade or opaque covers suit heat control, blackout or weather protection.

Should I choose greenhouse film or a tarp?

Choose film for a purpose-made cover with documented growing properties. Choose a tarp for flexible, removable or temporary protection.

Is shade cloth a replacement for a tarp?

Usually not. It reduces sunlight and allows airflow but is not waterproof. It can complement a weather cover.