PVC
Polyvinyl chloride (PVC) is classified as a thermoplastic. It is produced by extrusion, calendering or spread coating. Seaming is accomplished with either a solvent bond or a hot air weld. PVC roofing has been used in roofing applications since the 1960's.
Product Variations:
A. Different membrane polymer compositions and surfacing options include:
B. Different membrane reinforcement mats, fibers and backing.
Mats or fibers include:
1. Fiberglass reinforcement
2. Polyester reinforcement
C. Different manufacturing process.
Processes include:
1. Calendering Process
2. Extrusion Process
3. Spread coating Process .
D. Different thickness.
Thickness include:
1. .035 inch up to .120 inch
Methods of installation:
PVC is installed using any one of the following methods:
A. Ballasted
B. Mechanically Attached
C. Fully adhered
Product Advantages:
A. Membrane is available in colors to enhance project aesthetics.
B. Long duration of performance.
C. Membrane is installed by certified roof technicians.
D. Heat welded seams are stronger than adhesive or solvent bonded seams.
E. Financially strong manufacturers.
Product Limitations:
A. Faulty membrane formulation or installation.
B. Poor quality membranes can experience the following problems:
1. Polymer migration
2. Shrinkage
3. Surface degradation
4. Shatter
C. Weak companies coupled with weak quality control.
D. "You've a job, We've a product" attiude by manufactures.
Warranties:
Warranties available:
A. 5 to 10 years material only.
B. 5 to 15 years materials and labor for manufacture's products
C. 10 to 15 year deck up warranties for both labor & materials.
D. Wind velocity warranties range from none to 33 to 120 mph.