Gore Thread is the same fiber used into space suits because of it's consistent strength even when exposed to Ultraviolet light . Polyester thread has a limited life. Remember of how boat covers and awnings must be re-sewn even after only three years. Any screen that is mounted permanent (roll-downs, curtains, ext.) will be exposed to moisture, heat and cooling cycles, and UV light. Florida Building Code only test the product when it is new and does not address degradation of materials, another words It may work today but it may not work tomorrow. The weakest link in materials of a screen is the thread. A screen with Grommets rely completely on the layering of the hem and this hem is sewn with polyester thread. When placing grommets into the screen the material is cut (TORN) for the hole. The tear strength of the material is usually less than 50% or more of the strength of the material. Manufacturers compensate by layering ( 4 to 5 times) the material into hem to increase the strength to the initial uncut strength. If a hem unravels (due to thread deterioration) at all, the integrity and strength is completely lost and the screen will fail. .Polyester thread has been documented to lose 85% of it's strength in 3 years or less when exposed to the elements, Gore thread was documented to have virtually no loss of strength.
Stitches Matter!
There are some hurricane fabric companies that use chain stitch sewing machines because there are no bobbins and it is a fast and low cost means of production. This stitch is used predominately for embroidery style sewing because of it's chain like appearance. It is the stitch commonly known by it's unraveling characteristics. You can pull on a loose thread and the entire seam will come loose.
Custom Hurricane Products use only lockstitch sewing machine which seams do not unravel . Each stitch is independently locked from the next stitch. Combined with the Tenara thread our sewing will last for the lifetime of the fabric. Our Production cost are higher but our customers get a superior product.