TPO
Thermoplastic Polyolifin (TPO) is considered a Thermoplastic. TPO is produced utilizing a calandering process where two sheets of the membrane are put together on each side of a reinforcement sheet. These sheets are all run between to large rollers under presure and heat creating one membrane. TPO has been used as a roofing product since 1992 but was used for many years previously as a waterproofing product in Europe.
Product Variations:
Different membrane polymer compositions and surfacing options include:
A. Different thickness.
Thickness include:
I. .045 inch up to .120 inch
2. Amount of membrane above the reinforcing scrim
3. Fleece back membranes with different thickness of fleece adhered to the membrane
Methods of Installation:
TPO is installed using any one of the following methods:
A. Mechanically Attached
B. Fully adhered
C. Ballasted
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.
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
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 year materials and labor for manufacture's products
C. 10 to 30 year deck up warranties for both labor & materials.
D. Wind velocity warranties range from none to 33 to 120 mph