When “cool” roof requirements were first presented into energy standards like ASHRAE 90.1, specialists and specifiers were allowed to utilize less insulation if a reflective roofing system was set up.
On the other hand, many industry associations suggest that the optimum amount of insulation that can be warranted be used on a low-slope roofing task. Then, offer the roofing in question the additional energy performance increase that a cool roofing system may provide.
Many roofing systems in California still have hardly any insulation. Altering roofing system color from dark to light on a structure situated in a cooling environment zone makes good sense.
However that doesn’t translate to all geographical areas, structure types and roofing systems.
Some roofing contractors may be opposed to adding extra insulation on a re-roofing job due to the included expenditure of the brand-new insulation, raising curbs to accommodate it, etc. Due to these increased expenses, some professionals fear the property owner will cancel the reroofing task or utilize a lower bidder.
On the other hand, adding extra insulation involves extra labor, which must create a higher profit for the roofer. It also enables the building owner to satisfy energy code requirements and total is a more responsible approach to the environment. Even when a style expert is involved with a job, it is normally the roofing contractor’s responsibility to guarantee the brand-new or reroofing system satisfies code requirements.
We need to get back to thinking of the essentials of structure science. Roofing color depends upon location, constructing percentages and the amount of insulation in the roofing system. If that’s how we begin the decision-making process on roofing color, then the answers should come easily.”
Roofing insulation also works in all International Energy Conservation Code (IECC) Climate Zone Maps (1-5). It works all the time; not simply when the sun is shining, due to the fact that it stops all systems of heat flow– radiation, convection and conduction– from going into or leaving the building.
When attempting to determine maximum roof insulation levels through a life-cycle analysis, the “cost” line increases as the insulation level rises. When creating a chart based on life-cycle costing, the lowest life-cycle cost worth is where the insulation level and energy cost lines cross; for the most parts this at a roofing insulation level of R-20. Obviously, these worths depend greatly on environment, developing type and location, and the expenses of energy and insulation in the area.
Many industry associations, including SPRI, which represents sheet membrane and element suppliers to the commercial roof market– suggest that roofer and specifiers use the level of insulation required by the most current variation of the IECC. Among the reasons for this is that the IECC conducts a maximum insulation analysis to ensure its suggestions are cost-justified with regard to insulation expenses.
That’s why SPRI and other market companies do not suggest using ‘tradeoffs’ in between insulation levels and light-colored, reflective roof membranes to meet energy performance requirements.
In summary, it’s important for both professionals and specifiers to strive for synergy between reflective roof innovation and roofing system insulation in the majority of environment areas.
Visit www.ibcroofing.com for more information on energy saving roofs.