It should be noted that all shade sails have curved sides with a "3 to 6% negative". It is the characteristic pf a shade sail so that it can be properly stretched and flat. 

Warning: This is not the case for the pergolas, for which the sides are cut "right". 

How to define the dimensions to grasp?

What is the difference between the dimensions of the sail and the dimensions between the attachment points?

The red segments correspond to the distances between the attachment points, and the blue segments correspond to the dimensions of the sail.

We offer two methods to create the sail you are looking for:

Method 1 (blue dimensions): to answer "I know the dimensions of the sail" ;

This method responds to two situations:

                I want the same sail that I already have ;

                - I want the sail for which I have defined the dimensions myself .

 

Method 2 (red dimensions): to answer "I know the distances between fixing points" .

This method answers the following situation: I know what are the 3 or 4 points to which I want to fix my sail .

 

These two methods will allow you to obtain a sail whose dimensions will correspond to your environment.

1. Method 1: "I know the dimensions of the sail"

                1.1. I want the same sail as the one I already have

For that you will have to measure the dimensions between each angle of the sail ( all right - it is not necessary to follow the curvature of the sail) that you already have by making sure that it is well flat . If this sail is a trapeze, it will also measure a diagonal (see diagram below). These are the dimensions that must be entered in the form.

The sail will be made to these dimensions. Manual manufacturing can cause a small difference between the entered dimensions and the actual dimensions.

Warning : if sailing comes from another supplier, the installation constraints may be different. In this case it is better to choose the other method and seize the ribs between the fixing points.

 

                1.2. I want the sail for which I have defined the dimensions myself

To help you, you can draw on the ground or simulate with a rope the location of the sail. To define the dimensions of your sail, we recommend taking into account these elements:

- take the measurements as if all the attachment points of the sail were at the same height (the sail must be designed so that it can be mounted flat to ensure sufficient tension distances in all positions);

- each side of the sail must be between 100 cm and 750 cm ;

- the total area of ​​the sail must not exceed 28 m² ;

- provide a few centimeters of tension margin (the sail, because of the traction it undergoes, can relax up to 5% and the manual manufacture of the sails can generate a small difference between the seized dimensions and the actual dimensions);

- take into account the voltage axes (see diagram below): the axis formed by the angle of the sail and its point of attachment must be in the tension axis;

The voltage axes are the diagonals for the quadrilaterals and the medians for the triangles.

- take into account the distances of tension ( tension system + necessary margin to stretch the sail, distance proportional to the dimension of the sail).

If this sail is a trapeze, in addition to measurements on all four sides, it will be necessary to measure a diagonal (see diagram below).

These are the measures that must be entered in the form. By applying these tips, they will provide a flat sail without fold or relaxed side. A tight sail is an aesthetic and viable sail.

 

2. Method 2: "I know the distances between fixing points"

With this method, we will offer you a sail adapted to the location of your attachment points and calculate the optimal tension distance for this sail in your situation. You will have the choice to validate these values, or to modify them. However, we recommend that you rely on them because they are adapted to the size and fabric of the sail. They take into account all the necessary parameters (tensioning axes, elongation of the sail, etc.).

However, if you want to calculate the tension distances yourself, we recommend you to refer to the paragraph above "1.2 I want the sail for which I have defined the dimensions myself" in order to know some of the elements to be taken into account in this calculation. The minimum is 10 cm.

 

To position your attachment points, we recommend that you consider the following:

- leave 10 cm between the fixing point and a wall edge or angle so as not to catch the fastener too close to the edge;

- take into account gutters or other obstacles that could hinder the fixing of an anchoring system or be between the point of attachment and the angle of the sail;

- the mast to be sealed is in the middle of a 40 x 40 cm square; the mast to screw is in the middle of a circle of 22 cm; the mast with wall plates is remote from the wall of 7 cm;

- the sails have on each side a negative curvature  (d) (see diagram below);

- each side of the sail must be between 100 cm and 750 cm ;

- the total area of ​​the sail must not exceed 28 m² .

 

Once you have defined your fixing points, you can measure the distance between each (flat) and enter these data in the form. If this sail is a trapeze, it will also measure a diagonal (see diagram below). We recommend you to be precise in this measurement because it will determine the dimensions of the sail.

The application of these tips will allow you to get a flat sail without crease or relaxed side. A tight sail is an aesthetic and viable sail.

Pergolas sails: 

The elastic is included in the price of the sail and sell with the sail. 

If you want, you can add mushrooms hooks.