What are the fabrics available for roofing structures as per the current technology?
There are wide varieties of PVC coated polyester fabric and PTFE coated glass fiber fabric, silicone coated glass fabric, ETFE foils with 98% transparency etc…. All are 100% water proof and UV resistant, available in different colors and they are durable roofing material for permanent building constructions. Most of the tensile fabrics allows light inside the roofing area. They are translucent material of minimum10% to 45% and in normal weather condition no artificial light required during the day time under the cladded area of fabric. Black out fabrics are available for those who wanted to make opaque roofing. Tensile fabric structure have wonderful thermal efficiency against heat and UV radiation and they have good k value and u value compared to any other non-insulated roofing materials. In normal case there is no insulation required for fabrics structures to prevent and balance air conditioning. In case the structure is in extremely hot and cold regions double layer structures are recommended keeping an air space in between upper and lower layers to resist heat transmission in hotter regions and prevent condensation in colder regions where the temperature goes minus degrees.
What are the grades and types of fabric available?
There are different types of fabric available depends upon the size of the structure and type of applications. Type-0, Type-I, Type-II, Type-III, Type-IV and Type-V are the various ranges of fabric available, where Type-0 is the light duty fabric for temporary and smaller applications and Type II- Type-V for heavy duty applications for special type of engineered structures. Normally Type I to Type III is widely used for various structures. They are differ in tensile strength, tear resistance on base fabric and coating thickness. There are different grades of fabric available in terms of specialty on coating on top and bottom. There are weldable PVDF with mixture of acrylic lacquer and 100% non weldable PVDF, Teflon coating etc... These coatings are influencing factor for the life of the structure against UV radiations, microbial growth, chemical decompositions etc...
What are the color options?
For temporary structures we suggest lightweight fabrics. There are ranges of color fabric options available in type-0 series fabric. But for permanent structures we suggest heavy duty fabric which normally available in white color only. But in special cases if customer wanted color fabric for permanent structures and for better life span we can provide color fabric, but the order will be with reasonable quantity.
What is the warrantee and life of the fabric and tensile fabric structures?
Warranty for the fabric is limited to the type and grade of fabric choosing for a project. Warrantee starts from 5 years up to 20 years depends the type and grade of the fabric choosing. Fabric manufacturing companies offer warrantee for their approved fabricators with qualified design and execution team. Also our company issue warrantee for the design and structural stability for the structures for the period of warrantee issued by the fabric manufacturers. Life expectancy of the fabric is minimum 10 years for the lower grade fabric and go up to 45 to 60 years depends the type, grade, design and execution expertise and experience of the company who design and execute the structure.
How to choose a company to execute a tensile roofing structure?
Check whether the company has in house qualified design team and efficient design tools or from which company they get the design support and whether the third party company has design capacity to handle such design works, because the tensile structures need proper designing and engineering in all respect.
Check the company profile whether they have executed engineered structures without complaints more than 10 – 15 years.
Check with any reputed fabric manufacturer whether this company is an approved fabricator and Fabric manufacturing company should stand warrantee and issue warrantee certificate for the supplied fabric to this project.
Check whether the company is black listed by any reputed firms or fabric manufacturing companies due to the continuous failure of the structures installed by them.
Check whether the company has its own steel fabrication unit and a clean and tidy fabric welding unit with European standard welding machines which has approval from fabric manufacturer.
Check whether the company has automatic plotter cutting machines to plot and cut the cutting patterns.
Check whether the company follow quality assurance and quality control procedures insisted by the fabric manufacturer and designer of the tensile fabric structure.
What about wind and snow loads?
Every structure we design satisfies the Indian / European / American / British Standards and Codes for wind and snow loading (IS 875 part-03 or BS 6399 parts 2 & 3). We will also take into full account its location, height and surrounding buildings and if it is designed for permanent or temporary use. Please be aware that some companies offer sail shade structures that are inevitably lower in cost, but are not engineered for year-round use. If this is what you require, this will need to be incorporated into the specification whether the company follow quality assurance and quality control procedures insisted by the fabric manufacturer and designer of the tensile fabric structure.
Are tensile structure expensive?
A useful comparison is with other types of translucent roofing. A fabric structure over a shopping mall or school internal street could be half the cost of a toughened glass roof - particularly as the steel frame can be much lighter as it only needs to take a fraction of the dead weight. However, bespoke fabric structures would struggle to compete with clear or multi wall polycarbonate. The cost, of course, also needs to be weighed against the application, appearance lifespan.
What does your service include?
We offer a one-stop shop - from design, manufacture, installation and through to after sales maintenance support. We can supply everything above foundation level - IE the steel frame, tie rods, wire ropes, fabrics etc – and even glazing and cladding if these are closely integrated in the design.
How child proof are the structures?
All of our structures are designed to be as child friendly as possible. We strive to create structures which won’t harm or be harmed by children!
What happens to rainwater on the structure?
All the normal fabrics used for tensile structures are 100 % water proof unless customer wanted to have perforated mesh fabric. Perforated mesh fabric has a property of more translucency and during rain there will be gentle spray inside the covered area due the perforation. Most of the structures channel water to the perimeter of the canopy and then let it run off naturally. For some structures we can install a diverter or gutter which will redirect the water to the ground and out of the way may be rain water harvesting sump.
What will be the normal delivery period for the Tensile Membrane Structure / Canopy?
It depends the type and size of the structure. Normal case an average size of the structure need 6 weeks and for large scale project can go up to 6 months to one year, like railway platforms, airports and terminal canopy structures to sports arenas like stadium pavilions Fabric structure installation is not recommended during the windy and rainy seasons.
How easy is a structure to install?
Our structures are designed to be quick and easy to install by our team of trained personnel. For temporary structures we can show you how to erect and dismantle your canopy and provide written instructions to make it as simple as possible.
Do I need planning permission?
Not all types of structure will require planning permission but we would advise you check with your local planning authorities before placing an order. We can provide drawings and further information to support your planning application if necessary.
How easy will my structure be to maintain?
Tensile fabric is not difficult to maintain at all. We recommend an annual inspection and maintenance for all our structures just to make sure all is working properly and it looks as good as new!
Are there any hidden costs?
Our prices allow for the complete structure above ground. The most commonly overlooked cost is the design and construction of foundations. We will supply engineering analysis information to your ground works contractor, enabling them to supply the foundations.