Energy reliable roof materials– the expression sounds like something out of a government-subsidized report. It definitely doesn’t sound glamorous but it’s something you ought to think about the next time you require a brand-new roofing system, especially if you stay in a warm climate.
When it’s time to pick a new roofing system many people think in terms of exactly what material to pick and matching the color and style to the kind of house and community they live in. The other factor to consider, one that’s either not known or often ignored is the energy ramifications of your roof selection. There’s conventional roofing and afterwards there’s energy efficient roofing. The latter can possibly save you cash on your cooling bills while likewise being a good idea for the environment too.
Another name for energy effective roofing that you’ll see and hear typically is “cool roof” or “cool roofs”. The name has nothing to do with the “wow” factor of a house’s roofing system design, however rather, the result it carries the roofing and the home that’s underneath it.
Cool roof (or energy reliable roof) is simply roofing materials that save energy by keeping both your roofing system and your residence cooler throughout the warm seasons when you need to utilize the air conditioner.
So how can something as ordinary as a roofing be energy reliable? Let’s take a closer look.
If you have actually ever been up on your roofing or even touched the roofing system’s surface on a warm bright day you understand how warm it can get. The more the roofing is exposed to the sun and the darker its color, the hotter it ends up being.
For a lot of conventional roof materials, that heat is transferred to the sheathing below and into the attic. From there it can permeate into your home depending upon the condition of the insulation. As your home heats up it puts a higher demand on the cooling system.
Energy efficient roof products decrease that “heat-soak” impact, decreasing the amount of heat that’s entered your home. That typically indicates that it does not take as much a/c effort to keep your home comfy.
It’s Everything about Reflectance And Emittance
Energy effective roof takes advantage of 2 homes called reflectance and emittance. In a nutshell cool roof products have much better reflectance and emittance values than non-cool roofing system materials.
Reflectance is the ability of a product to reflect the energy from the sun back into the atmosphere as opposed to absorbing it. It’s determined on a scale from 0 to 1 with 1 being the highest level of reflectivity.
. When you look for cool roofing materials try to find the term “solar reflectance” on the product’s requirements sheet. It’ll most likely be a decimal number like 0.76. You can make use of that number to compare various cool roofing items.
, if there’s a down-side to a roofing’s solar reflectance home it’s that it can alter over time.. Dirt accumulation and typical deterioration of the roof material will certainly have the tendency to lessen it’s ability to deflect the sun’s energy. That’s why you’ll see standards and scores for cool roof items based upon efficiency after 3 years of service.
Emittance represents a product’s ability to “lose” or produce heat rather than maintain it. Like reflectance, it’s determined on a 0-to-1 scale with 1 being a further up (better) value. Emittance is also provided in the specs for energy reliable roofing materials as a decimal like 0.90 and is usually designated as “thermal emittance”.
ENERGY STAR Roofing
Similar to your dishwasher or fridge, energy efficient roof products can make the ENERGY STAR label, officially designating them as meeting a pre-set standard for energy efficiency.
To be certified as an ENERGY STAR roofing the material need to fulfill the following minimum requirements:
Initial Solar Reflectance – greater than or equivalent to 0.25
Reflectance After 3 Years – greater than or equal to 0.15
These certifications are for steep-pitch roofing systems, or roofs that have a rise-to-run ratio greater than 2-in-12. This represents the majority of residential roofing system designs.
Roofing systems with a lower pitch are basically flat roofings and have to satisfy reflectance qualifications of 0.65 and 0.50 for preliminary and maintenance values respectively.
Bear in mind that these are the minimum standards to meet ENERGY STAR accreditation. Other states, local regions or municipalities might enact more rigid specifications for specifying cool roofs. California’s Title 24 Building Standards Code sets forth more stringent requirements for cool roof.
The advantage of the ENERGY STAR labeling system is that it provides you with a means to determine exactly what roof products fulfill further up energy efficiency standards and in the end, offer better energy-related options for your home (not to point out the environment).
The Perks And Drawbacks Of Cool Roof
The main factor cool roof need to be one of the considerations in your decision procedure is that it offers several advantages. But simply as it is with any item, there are a couple of drawbacks too. Whether the advantages outweigh the disadvantages depends on a number of criteria and you’ll have to be the final judge.
The Benefits …
Lower Energy Costs
The less heat that’s sent into your house from your roofing system the cooler your home will certainly be and the less you’ll need to run your air conditioning system. According to the Cool Roofing Rating Council, that savings can be anywhere from 7 % to 15 %.
Much better Comfort
Even if you do not use/have cooling, a cooler house during the warmer months of the year tends to be more comfortable. The chimney impact (where the warmer air rises upwards) can make the upper floor warmer than the main level if you have a two-story home. Combine that with a hot roofing system that transfers heat from above and it can make for some unpleasant sleeping quarters.
Extended Roofing Life
Extreme heat can trigger more quick deterioration of your roofing system, especially one with asphalt shingles which naturally break down gradually with direct exposure to the sun. The longer your roof lasts the fewer times you’ll have to re-shingle.
Possibility For Economic Discounts
Energy business in some municipalities provide discounts for the setup of energy reliable roofing Contact your utility business straight to see if they presently offer a rebate.
The Cool Roof Score Council, a non-profit company chartered with establishing techniques for labeling and evaluating energy reliable roofing has a listing of rebate programs (link opens in a new browser window) at the ‘resources’ section of their web site. These listings can sometimes end up being out of date. You can utilize them as a very first attempt but it’s best to check straight with your local energy company to confirm.
The aforementioned advantages are direct advantages, suggesting they benefit you directly. Energy reliable roof also features some ‘trickle-down’ advantages too that are descendants of the direct advantages.
For instance, utilizing less energy since you don’t need as much air conditioning is constantly an advantage to the environment. It lowers electrical need which translates into less fuel had to produce the electricity.
Roofs that have longer lives indicates there’s a reduction in the frequency and quantity of roofing scrap that enters into land fills when an old roofing system is torn off and a new roofing set up.
Energy reliable roofs also help in reducing the metropolitan heat island effect that results from the emission of excess heat from hot roofings in a city environment. The more cool roofs that are installed the less residual heat is released, keeping overall temperature levels a little lower than would be otherwise. This can have an overall favorable benefit in the reduction of a city area’s cooling needs.
The Disadvantages …
Lighter Roofing system Colors May Look Dirtier More Quickly
The lighter colors associated with some cool roof items, particularly a few of the light gray asphalt shingles, might establish algae streaks and show dirt more easily. Some asphalt shingles consist of constituents like copper to assist postpone the beginning of algae but it will not fend off pollution and other natural deposits.
Cool Roof Could Cause A Boost In Heating Requirements
Throughout the winter a home’s roofing system can make beneficial use of any heat absorbed from the sun. Cool roof works versus this process and could require an increase in winter season heating. To exactly what extent is figured out by geographical location and the typical qualities of the winter like period, snowfall, and the average number of cloudy vs. sunny days.
On this last point you’ll find details from numerous sources that states that the added heating energy required due to the fact that of the cool-roof effect during the winter season is balanced out by the reduction in energy needs to cool your home during the warm months. That may be true for some climate zones however not all.
If you think about it in regards to yearly heating and cooling days you can make your very own assessment on whether you stay in a climate that has mainly more heating than cooling needs. If that’s the case then the benefits of energy effective roofing could be lessened.
What Kinds Of Cool Roof Selections Do I Have?
To begin with, not all roof qualifies as cool roofing. Energy effective roofing takes advantage of specific technologies and material homes that aren’t offered in every kind of roofing product. No matter that fact nevertheless there are still lots of cool roof products you can pick from.
Cool Roofs – Offered In Numerous Materials & Colors
Cool roof is available in several of the primary types of roof materials on the market for domestic homes. ENERGY STAR certified roof is available in metal, tile (concrete, ceramic and composite) and asphalt shingles. Metal tends to have the very best reflectance values making it a much better selection from a performance viewpoint.
There’s also an affordable variety of colors that you can pick from too, which differs depending on the kind of roof material you choose. The good news right here is that you’re not locked into picking very light or white gray.
From a color point of view you’ll most likely have a bigger variety of selections (including some darker colors) amongst the metal roofing items since they typically have better reflectance capabilities. Some tile products also come with a decent variety of colors to pick from.
However if you have your heart set on asphalt shingles there are still a surprising variety of color options offered. If you prefer a darker roofing color, there are some medium browns and grays. However there aren’t any extremely dark or black gray colors in asphalt that satisfy cool roofing credentials, a minimum of at the time of this writing.
Ways to Find Energy Effective Roof
There are several ways to find cool roofing items. One excellent source is the ENERGY STAR roof product websites (link opens in a new browser window) which consists of connected to either a PDF or MS Excel spreadsheet download that lists all the ENERGY STAR-qualified items.
The great part about this list is that it’s usually kept up to date and consists of a thorough quantity of details. The information consisted of the producer’s name, the specific roofing product name (brand and design), the kind of material in addition to the reflectance values and service warranty.
For example, if you’re looking for a cool tile roof, merely download the list (utilizing the Excel format permits you to arrange it to your preference), look for “tile” under the material category and inspect out the items that qualify. From there you can pop the manufacturer and product name into a search engine to learn more information including where to buy the item.
The other method to find cool roofing is to take a look at the producers that make the kind of roof you have an interest in and see if they provide energy reliable roofing. If they do offer it, they’ll make note of it on their web site and in their product literature. Products are generally labeled with the ENERGY STAR logo.
You can contact local roof service providers in your area and ask them what they offer relative to energy effective roof products. Simply make sure you do your research first and understand the truths so you’re in a position to ask great questions.