SIZE "UNDER TENSION" AND FABRIC ELONGATION FACTOR
When you choose a "Saill" or "Solaria" sail with standard sizes or when you configure it "made to measure", you will come across the term "size under tension".
What does this expression mean and what dare you have to consider when choosing and buying?
"Under tension" sizes
All the measurements you will find on our website refer to correctly tensioned sails:
- standard sail sizes
- the measurements that you will insert in the "made to measure" configurator
Our fabrics (like all technical fabrics) stretch slightly when placed under tension. The elongation takes place gradually in the first weeks.
The initial size of the sail that we will send you is slightly less than the "under tension" measurement.
“Your shade sail will reach its final size approx. 14-21 days after installation. "
The elongation of the fabrics
Like all solid materials, shade sail fabrics also stretch when subjected to traction forces.
This slight "elasticity" allows the fabrics to effectively combat the impact of gusts of wind, hail and rain without damaging yourself.
The ability to absorb these forces gives our sails a very high longevity and strength.
The elongation factor varies for our two fabrics:
- Purishade® stretches by 2% (approx. 4 inches over 16 feet)
- Meshnet® stretches by 5% (approx. 10 inches over 16 feet)
Shadeandbeyond already predicts and compensates for the elongation factor. You won't have to worry about choosing a smaller sail.
Here is the example of a Solaria Waterproof sail in Purishade fabric with 16x16ft. "under tension" size:
The new and never assembled 16ft. sail initially measures 15'8" x 15'8".
Later some days the fabric stretches by approx. 4inches (ie approx. 2% of the initial length) and reaches the final "under tension" size of 16ft.
I have just received my shade sail. How can I check if the sizes are correct?
All "under tension" sizes refer to the sizes that the sail will assume after approx. 14-21 days of installation.
If you take the measurements of the "untensioned" sail, spreading it on the floor, you will notice that it is slightly smaller than the "under tension" measurements declared on the product sheet or in the custom configurator.
Purishade® fabric sails will be 2% smaller, Meshnet breathable sails are 5% smaller.
When you assemble the sail and tension it, you will notice that the size of the sail increases due to the stretch of the fabric. The final measurements will be reached after approx. 2-3 weeks.
Do I have to compensate for the elongation factor by choosing a smaller sail?
Absolutely not. If you need a sail with a size of 16x16ft. you have to choose a 16x16ft. m sail.
If you want a rectangular "custom sail" with the measures 150 x 300 inches you can enter these measures in our configurator.
In both cases we will send you a sail with the "final - under tension" sizes that correspond precisely to your expectations.