The Enemy of Roof Piping
Thermal Expansion/Contraction & Vibration
Thermal expansion/contraction can lead to premature and/or accelerated failure of pipe and pipe connections. While the following formulas and charts show how much pipes expand and contract – it takes only a small amount of change to impart a tremendous amount of force on the pipe. Vibration, including excessive pulsation, mechanical resonance or inadequate support can also result in pipe damage and roof damage.
Rooftop pipe supports protect roofs by allowing pipes to move without damaging the roof and are required by code. Wood and synthetic blocks (plastic, rubber, foam) can tear roofs and cause leaks as they move when pipes expand and contract. Wood blocks deteriorate over time, which can result in unsupported, collapsed pipes and are not compliant with industry standards or codes including the International Fuel Gas Code. Additionally, wind, rain and snow can move and damage pipes that are propped on wood or synthetic blocks.
The Formulas Provide the Reasoning
Charts Show the Data 
… AND Photos Show The Reality!!!!
A Comment about Expansion Joints to address thermal effects:
The issue to consider with Expansion joints, is the amount pressure in the pipe. For instance, a standard DN200 Steel pipe can, using expansion bellows, create over 2.5 tons of force. (Walraven study)
.. with A Proven Engineering Answer!!!
Roller Supports
MAPA's EPDM Roller Roof Supports perform two duties. 
- First, while other's rollers are made of plastic or metal, MAPA's EPDM provides the softest roller in the industry – thereby, providing the best performance in mitigating vibration. That's why it is used on boat trailers- protecting the fiberglass and metal boat from the effects of road/travel vibration.
- Second, MAPA's roof support has the smoothest roller in industry. Thereby, being the best at reducing the stress on pipe and pipe connections.