Sidebar
GRAAS iRigator - Automatic greenhouse irrigation system

GRAAS iRigator - Automatic greenhouse irrigation system

The automatic irrigation system is ideal for lawns, gardens, and greenhouses. Fully smartphone-controlled, it ensures the entire garden is watered efficiently and effortlessly.
GRAAS LawnCare - 7-zone automatic lawn irrigation controller

GRAAS LawnCare - 7-zone automatic lawn irrigation controller

Overview of greenhouse coating materials

2024-05-01 0 Comments

The cover is the material that covers the frame of the greenhouse and through which light passes. The coating can therefore greatly affect things like appearance, functionality, cost and maintenance. When choosing a greenhouse structure, you need to decide which coating will best suit the project. Below we review the most popular greenhouse coatings, their technical features and pros and cons.

 

Glass - single layer

Light transmission*: 85-90%

R value**: 0.9

 

ADVANTAGES:

• The duration of use is unlimited if it does not break

• Tempered glass is stronger and requires fewer support bars

 

DISADVANTAGES:

• Fragile, easily broken coating

• May not support the weight of snow

• Many supports are required

• Clear glass does not scatter light

Factory-glued sealed two-layer glass

Light transmission*: 70-75%

R value **: double layer 1.5-2.0, low-e 2.5

 

ADVANTAGES:

• The duration of use is unlimited if it does not break

• Can be used in areas with low temperatures

 

DISADVANTAGES:

• Difficult

• Clear glass does not scatter light

• Difficult to install, requires precise framing

Polyethylene - one layer

Light transmission*: 80-90% (new materials)

R value**: single film 0.87 6 mil.

 

ADVANTAGES:

• IR (infrared interception) films are treated to reduce heat loss

• Non-drip or non-fog films are manufactured to resist condensation

• Ethylene vinyl acetate treatment eliminates cracking and low temperature wear

• Easy to install, no precise framing required

• The cheapest choice of greenhouse cover

 

DISADVANTAGES:

• Tears easily

• Opaque

• UV-resistant polyethylene lasts only 1-2 years

• Light transmission decreases over time

• The film expands in warm weather and contracts in cold weather

Polyethylene - double layer

Light transmission*: 60-80%

R-values** of double films: 5 ml film 1.5, 6 ml film 1.7

 

ADVANTAGES:

• Heat loss is significantly reduced when a fan is used to create an air gap between the two film layers

• IR (infrared interception) films are designed to minimize heat loss

• Non-drip or non-fog films are specially formulated to resist condensation

• Ethylene vinyl acetate treatment eliminates cracking and low temperature wear

• Easy to install, no precise framing required

• The cheapest choice of greenhouse cover

 

DISADVANTAGES:

• Tears easily

• Opaque

• UV-resistant polyethylene lasts only 1-2 years

• Light transmission decreases over time

• The film expands in warm weather and contracts in cold weather

Polycarbonate - rigid, double walls

light transmission*: 83%

R value**: 6 mm 1.6, 8 mm 1.7

 

ADVANTAGES:

• The most fire-resistant greenhouse cover

• Resistant to UV rays

• Very strong

• Easy

• Easy to cut and install

• Ensures good performance for 7-10 years after installation

 

DISADVANTAGES:

• Can be expensive

• Partially transparent

Polycarbonate film - triple or quadruple wall rigid plastic

light transmission*: 75%

R value** triple wall: 8mm 2.0-2.1, 16mm 2.5

R value** quad walls: 6 mm 1.8, 8 mm 2.1

 

ADVANTAGES:

• The most fire-resistant greenhouse cover

• Resistant to UV rays

• Very strong

• Easy

• Easy to cut and install

• Ensures good performance for 7-10 years after installation

 

DISADVANTAGES:

• Can be expensive

• Partially transparent

* Light transmittance is the percentage of light that enters the greenhouse through the material.
** R-value is a common measure of insulation (hr°Fsq.ft/Btu). The higher the R value, the more heat is trapped inside the greenhouse.

 

From the above data, it can be concluded that the choice of different greenhouse coatings has various advantages and disadvantages, depending on their light transmission, R-value, resistance, installation complexity and cost. The properties of materials such as glass, polyethylene and polycarbonate determine their suitability for various environments and needs:

 

- Glass is durable and has high light transmission, but is fragile and requires many supports.

- Polyethylene is an economical choice with good light transmission and heat retention, but tends to expand and contract with temperature fluctuations. Resistance to UV radiation gradually decreases, so the film will need to be changed every 7-10 years.

- Polycarbonate has recently been a very popular choice among gardeners due to its durability, ease of installation and good heat retention.

 

When choosing between these coatings, you should take into account the individual requirements of the greenhouse, such as budget, climatic conditions, location and the desired functionality of the greenhouse.

Prev Post
Next Post

Leave a comment

Please note, comments need to be approved before they are published.

GRAAS Automation is a company creating innovative irrigation solutions.

GRAAS products are developed with ecology and sustainability in mind.

Irrigation systems and other GRAAS products are designed and assembled in Lithuania.

Information

Useful links

@ 2025 Graas Automation UAB, all rights reserved.

  • Visa
  • Mastercard
  • Maestro
  • Apple Pay
  • PayPal

Ačiū už prenumeratą!

Šis el. pašto adresas jau užregistruotas

Choose Options

Edit Option
Terms & Conditions
1. GENERAL PROVISIONS 1.1. These Terms and Conditions (hereinafter referred to as the “Terms”) apply to the Client when placing an order in the Graas online store (hereinafter referred to as the “Store”). 1.2. Graas reserves the right to amend the Terms of the Store. The version of the Terms applicable at the time of placing the order (as indicated with the order) shall apply to the Client. 1.3. The Client may not place an order in the Graas Store without first reviewing the Terms. In all cases, it is deemed that the Client has read and agreed to the Terms if, prior to placing the order, they confirm their acceptance by clicking “AGREE.” If the Client does not agree with all or part of the Terms, they must not place an order electronically in the Graas Store. Otherwise, it is considered that the Client has read and unconditionally accepted all Terms of the Store. 1.4. Graas shall not be held liable for any losses incurred due to the Client’s failure to review the Terms, despite having had the opportunity to do so and having received appropriate recommendations and obligations. 2. PARTIES AND CONTACT INFORMATION 2.1. Seller: MB “Graas Automation”, Miško Street 9, Tauragė, LT-72276. Company code: 306333210. Email: info@graas.lt 2.2. Buyer (Client): A person visiting the website either as a potential or returning customer. 3. ORDERING AND PAYMENT PROCEDURE 3.1. Upon visiting the Store’s website, the Client selects the desired products, forming a shopping cart. 3.2. After forming the cart, the Client must enter the necessary delivery information: name, surname, delivery address, phone number, and any additional details relevant to the delivery. Graas confirms that the Client’s data will be used solely for the purpose of selling and delivering goods, in compliance with the legal requirements of the Republic of Lithuania regarding personal data protection. 3.3. The Client then selects a payment method from those available in the Graas Store, along with a preferred delivery option. 3.4. In the final step, all entered data is displayed for review. The Client must verify the accuracy of the information and may correct any errors before submitting the order. The order cannot be confirmed until the Client acknowledges and agrees to the Terms. If the Client has not reviewed the Terms prior to selecting products, they must do so before confirming the order and its details. 3.5. Once the Client confirms the order, it is sent to Graas. The order is considered submitted once received by Graas. At that moment, a contract between the Client and Graas is deemed concluded. However, the contract becomes enforceable only upon payment confirmation: – For online banking, when Graas receives confirmation from the Client’s bank; – For bank transfers, when payment is received; – For cash or card payments at parcel terminals, when the Client confirms the order in the Store. 3.6. Upon order submission, the Graas system automatically sends an email to the Client with the order details and submitted information. 3.7. Once Graas receives confirmation of payment from the bank, a notification is sent to the Client’s email. This moment marks the beginning of contract execution between the Client and Graas. 3.8. The Client’s order is stored in the Graas database in accordance with the applicable laws of the Republic of Lithuania regarding data retention. 3.9. In all cases, by placing an order, the Client is deemed to have read and unconditionally agreed to all Terms of the Store and any conditions specified with the order. 3.10. The contract is concluded and executed in the national language. 4. WARRANTIES AND PRICING 4.1. Product specifications are generally provided alongside each item in the Store. 4.2. Graas informs, and the Client acknowledges, that product colors, shapes, or other parameters may differ from actual items due to monitor display characteristics. 4.3. The Client agrees to pay the price indicated in the order when placing it electronically in the Store. 4.5. Prices in the Store and in the order are shown in the official national currency and include VAT. 4.6. Graas sells products that meet the conditions specified in the order. If the delivered products do not meet certain order requirements, the Client agrees to immediately notify Graas by phone or email. Graas commits to resolving any deficiencies caused by its own or third-party fault. If not resolved within a reasonable time agreed with the Client, the Client may exercise their rights under the Civil Code of the Republic of Lithuania. Graas obligations regarding products: 4.6.1. Deliver products of appropriate quality that meet the order specifications. 4.6.2. Deliver the quantity of products specified in the order. Graas is not liable for discrepancies caused by incorrect data provided by the Client. 4.6.3. Provide a product assortment that matches the criteria specified in the order. 4.6.4. If the order includes a set of items, Graas shall deliver all components of the set. 4.6.5. Products shall be packaged appropriately based on their nature to ensure usability as intended.5. PAYMENT PROCEDURE AND TERMS 5.1. The Client shall pay for the ordered goods using one of the payment methods specified in the Graas Store: bank transfer, online banking, credit card, or cash payment. 5.2. If the Client chooses an online payment method, they are obliged to pay immediately. If the Client opts to pay upon delivery, payment must be made upon receipt of the goods. In other cases, the Client forfeits the right to claim delays in delivery, as the order is processed only after payment is received. 5.3. If the Client selects delivery via ZITICITY couriers, payment must be made in advance via online banking. 6. PRODUCT RETURNS 6.1. All products purchased from the Graas.lt online store may be returned within 30 calendar days from the date of receipt (Retail Trade Rules, Section II, Subsection I). Products purchased online may be returned within 30 days of receipt. Returns are accepted only by completing the electronic return form in the buyer’s account or by contacting us via electronic means and arranging the return personally. Returns are processed exclusively via LP Express terminals. After submitting a request and receiving administrator approval (within 2 business days), a return label will be sent to the Client’s email. Physical returns are not accepted. All returns must follow the methods outlined above. Returns of quality goods are processed in accordance with the procedure established by the Government of the Republic of Lithuania in Resolution No. 697 dated 2001-06-11. Delivery costs are not reimbursed in such cases. Returns from abroad are the responsibility of the buyer. Items must be sent via registered mail with a tracking number. To return or exchange goods, contact us via the provided phone number or email. Returned items must be unused, except in cases of manufacturing defects not disclosed in the product description. Items must be in proper packaging (this does not apply to defective goods or items received with damaged packaging). Returned items must be unused and retain their original appearance (e.g., intact labels, protective films, etc.). 6.2. Returned items must: 6.2.1. Be unworn, unused, and free of external or internal signs of wear (not applicable to defective goods); 6.2.2. Be packed in suitable packaging to prevent damage during transport; 6.2.3. Include all original labels and retain commercial appearance, unless the item was purchased with damaged packaging or appearance as noted in the product description; 6.2.4. Refunds will be issued to your account within 14 days (Civil Code of the Republic of Lithuania, Article 6.22811, Part 2). 6.3. Product Defects 6.3.1. The Seller is responsible for defects that become apparent within two years from the date of purchase (Civil Code of the Republic of Lithuania, Article 6.338), provided the item was brand new. 6.3.2. Your feedback matters! If you are dissatisfied with the quality of the purchased product, contact us via email at info@graas.lt or by phone. We will review your claim and respond within 14 days. Please include proof of purchase (invoice, receipt, or payment confirmation). For product quality inquiries, contact us during business hours (8:00–17:00). 6.3.3. If the Client is not satisfied with the final response from MB “Graas Automation,” they may seek out-of-court dispute resolution through the State Consumer Rights Protection Authority (Vilniaus g. 25, 01402 Vilnius, Lithuania, email: tarnyba@vvtat.lt, phone: +370 5 262 6751, website: www.vvtat.lt), its regional offices, or submit a request via the ODR platform: http://ec.europa.eu/odr/ 6.3.4. Consumer disputes may be resolved out of court by the competent State Consumer Rights Protection Authority (Vilniaus g. 25, 01402 Vilnius, www.vvtat.lt). 7. PRODUCT DELIVERY 7.1. The Client may choose from various delivery methods. Delivery depends on the selected service. 7.2. Typically, goods are delivered to the address specified by the Buyer within 3–7 business days after payment and shipping confirmation, provided the goods are in stock. The Seller does not guarantee delivery within this timeframe, especially if the goods are not in stock. 7.4. For orders placed with ZITICITY courier delivery before 12:00 PM, delivery will occur the same evening between 6:00 PM and 10:00 PM. Note: During holiday seasons, delivery may be delayed by 2–5 days beyond the standard 3–7 business day timeframe. 7.5. The exact delivery date and time will be provided in a notification sent to the Buyer’s email address as specified in the registration form. The Buyer, having entered into a purchase agreement, agrees to check their email daily until the delivery notification is received. 7.6. Before placing an order, the Client must verify the accuracy of the provided contact information to avoid misunderstandings or delivery delays. The Seller is not responsible for delays or issues caused by incorrect or inaccurate data submitted during order placement. 7.7. If the product arrives in poor condition or in unsealed packaging, the Client must notify the online store via email at info@graas.lt or by phone.
this is just a warning
Login
Forgot your password? Create account
Meniu