Vegetative Roofs Could Save On Water Bills

Lucas Hamilton

Lucas Hamilton is Manager, Building Science Applications for CertainTeed Corporation

Often, when I am conducting seminars on sustainable solutions for buildings, the question comes up regarding the benefits of a vegetative roofing system.  One of the major benefits starting to take place provides a boost to a company or building owners’ bottom line – reduced water bills!

Some major municipalities such as Portland, Oregon are beginning to reward building owners with reduced water bills when systems are put in place in or on the building to reduce the storm water run-off.  The reason for this is many municipalities have a co-mingled system where storm water and sewer discharge are carried through the storms drains to the treatment plant together. Very often, in a significant rain event, the capacity of the system is overwhelmed. As a result, the overflow of raw effluent runs into estuaries and the municipality can incur fines because the storm drains were overloaded.

LiveRoof

What I have seen is that companies who take measures to control the rainwater run-off on their sites are starting to be rewarded for their efforts.  One practice which is gaining in popularity is the utilization a vegetative or live roof and municipalities are rewarding companies for installing vegetative roofs by reducing water rates.  That can be a significant savings for a large, multi-tenant building.

When you think about it, this is a very interesting angle that municipalities are taking to promote the use of green roofs.  It is a win-win in that it controls utility costs for the building owner which offsets the cost of the installation of the vegetative roof.  It is a positive for the community because it helps to maintain and prolong the life of the utility systems by not overloading them. It also can provide a nice environment for occupants if they have access to the roof.

The 12 Months of Homebuilding by CertainTeed

Mike Loughery

Mike Loughery

Mike Loughery is Director, Corporate Marketing Communications for CertainTeed Corporation

In the first month of homebuilding, my true love gave to me, a piece of land overlooking a scenic ravine.

In the second month of homebuilding, my true love gave to me, an awesome set of architect house plan drawings.

In the third month of homebuilding, my true love gave to me, a Form-A-Drain™ 3-in-1 Foundation footing system for drainage ease.

In the fourth month of homebuilding, my true love gave to me, a high quality, two-story wood framed home built to please.

In the fifth month of homebuilding, my true love gave to me, CertaWrap™ weather-resistant barrier and Cedar Impressions® Polymer Shake Siding in ivy green.

In the sixth month of homebuilding, my true love gave to me, thermally efficient Optima® blown-in wall insulation and Air Renew™ drywall to rid me of those VOCs.

In the seventh month of homebuilding, my true love gave to me, Ecophon® Focus Ds acoustic ceiling tiles for my media room and a 70-inch big screen TV.

In the eighth month of homebuilding, my true love gave to me, a well-insulated attic filled with InsuSafe® SP.

In the ninth month of homebuilding, my true love gave to me, a roof featuring Landmark Solaris™ solar reflective shingles complemented with Apollo Solar Roofing® to make my own energy;

In the 10th month of homebuilding, my true love gave to me, an EverNew® LT Deck and a yard surrounded by a Chesterfield Vinyl Fence for privacy.

In the 11th month of homebuilding, my true love gave to me;  Restoration Millwork Trim® to finish our dream; an EverNew LT Deck and a yard surrounded by a Chesterfield Vinyl Fencefor privacy; a roof featuring Landmark Solaris solar reflective shingles and complemented with Apollo Solar Roofing to make my own energy; a well-insulated attic filled with InsuSafe SP; Ecophon Focus D acoustic ceiling tiles for my media room and a 70-inch big screen TV; thermally efficient Optima blown-in wall insulation and Air Renew drywall to rid me of those VOC’s; CertaWrap weather-resistant barrier and Cedar Impressions Polymer Shake Siding in ivy green; a high quality, two-story wood framed home built to please; a Form-A-Drain 3-in-1 Foundation footing system for drainage ease; an awesome set of architect house plan drawings; and a piece of land overlooking a scenic ravine.

In the 12th month of homebuilding, my true love gave to me:  the keys to a brand new dream home built with CertainTeed….

Happy Holidays from all of your friends at CertainTeed!

Tips for Optimum Efficiency of Solar and Cool Roofs

Lucas Hamilton

Lucas Hamilton is Manager, Building Science Applications for CertainTeed Corporation

While conducting a webinar recently on thermal performance in building envelopes I was reminded about a very important issue related to both commercial cool roofs and photovoltaic roofs.  They must be cleaned!

If you do not clean your solar panels and cool roofs their efficiency plummets.  Roofs are out of sight but it is important to not forget about them.  Cool and photovoltaic roofs should be inspected every six months to insure that they are performing properly and providing the maximum benefit of the product.

Reminder! No one should work on a roof but a roofer. The integrity of the roof is very important and the correct tools and cleaning agents much be used to properly clean a cool or photovoltaic roof without damage. I cannot stress this point enough – any cleaning to be performed must be done in accordance with the recommendations of the roof or photovoltaic manufacturer. Inspections should also be conducted only by a roofer or the manufacturer.

If you would like to read a great paper on the economic viability of cleaning cool roofs just follow this link: http://www.ornl.gov/sci/roofs+walls/staff/papers/new_51.pdf.

New OSHA Directive Highlights Hazards to Roofing Contractors

Falls from roofs, or other heights, are the number one cause of death for roofing installers.  In 2009, there were 283 falls on construction jobsites that led to serious injury or death. The reality is that falls can easily be avoided by utilizing the appropriate fall protection gear. The importance of utilizing fall protection is under renewed scrutiny by the U.S. Department of Labor’s Occupational Safety and Health Administration (OHSA) and the fines for non-compliance can be crippling to roofing contractors.

Residential construction employers need to comply with the agency’s new directive to provide residential construction workers with appropriate fall protection. OSHA has implemented a three month phase-in period for the directive, which began on June 16 and runs until September 15, 2011. During the phase-in period contractors who are compliant with the old directive (STD 03-00-001) will receive a hazard alert letter informing the employers of the fall protection methods available, but also reminding contractors that they need to have a site-specific fall protection plan in writing.  If the contractor complies with the old directive it is likely that OSHA will not issue fines or stop the contractor from working until the contractor complies with the fall protection directive.

However, if the roofing contractor is not complying with the old fall protection directive, OSHA may enforce the new directive, and issue fines against the contractor.  OSHA also has authority to require a jobsite to be shut down until the site comes into compliance with the OSHA regulations and/or directives.

The Citation Policy includes;

  1. If an employer is engaged in residential construction, but does not provide guardrail systems, safety net systems, personal fall arrest systems, or other fall protection allowed under 1926.501(b), a citation for violating 1926.501(b)(13) should be issued unless the employer can demonstrate the infeasibility of these protective measures or the existence of a greater hazard.
  2. Under STD 03-00-001, the employer was not required to have a fall protection plan that was written and site-specific. With the cancellation of STD 03-00-001, fall protection plans under 1926.502(k) must be written and site-specific.

Roofing contractors have argued that fall protection can get in the way of the work they perform because of the way it is tethered on the roof.  Fall protection manufacturers have tried to address this concern by creating feasible controls that can be put in place to protect the workers from fall hazards and not create tripping hazards for contractors that work on roofs. OSHA’s Residential Fall Protection page is a great resource for contractors and provides several documents that are easy to navigate and understand. One of these, Guidance Document on Fall Protection in Residential Construction is an excellent resource that provides examples of new protection gear and how they work.  It also provides photos, brief explanations, and is easy to follow. The Public Residential Fall Protection Presentation provides details on guardrail and safety net systems.

As a manufacturer of roofing materials, CertainTeed is committed to safety in the production and application of construction products.  We also feel that it is important  that you abide by OSHA directives in order to avoid placing your employees or workers in unsafe situations that could result in fines or a shutdown of a jobsite.  Creating safe practices in the workplace and on the jobsite protects the business and its employees.  Choose safety first.

Dennis Wilson is Manager, Product Stewardship for CertainTeed/Saint-Gobain.

JLC Live Residential Construction Show Stuns with Volume of Exhibitors and Attendees

Myron Ferguson clinic on drywall finishing

Why on a sunny, cool, dry, Rhode Island day would nearly 6,000 residential construction professionals from all over New England – and beyond – take a couple of days off, after the most brutal winter in New England history, to attend a trade show?

Why would manufacturers from all over the country flock to Providence, Rhode Island to exhibit at this trade event and why is there a higher demand for exhibit space at this show than the capacity to exhibit?

Why is this show one of the few trade events in the last three for four years to have growth as a problem?

Why? Because JLC Live, presented by The Journal of Light Construction, Remodeling, and Tools of the Trade magazines published by Hanley Wood delivers one of the highest trade show values – pound for pound, dollar for dollar – in the industry!

This show’s attendance increased by nearly 10 percent from 2010 to 2011 and the exhibitor participation increased by 15 percent.  This is extraordinary in a down economy!

Today, building technology is changing at a rapid rate. The beauty of JLC Live is the marriage of the practical side with the science/theory side attracting installers, applicators and remodelers who are eager not only to see the latest products but who want to see the science/theory and best practice applications in action by attending hands-on clinics.

Two examples of the show’s clinics supported by CertainTeed (both packed) were:

  • Drywall Trade Secrets – Gypsum drywall finishing clinic conducted by Myron Ferguson, Building Specialist, demonstrating best practices of drywall installation and finishing using a new gypsum product, AirRenew™ that removes volatile organic compounds (VOC’s) from the air improving the indoor air quality.
  • Home Performance SolutionsBill Robinson, Building Specialist discussed the opportunities of bringing energy efficiency to older homes.  The retrofit market will continue to grow as homeowners seek to improve the efficiencies of their building envelop. It is expected that, over the coming years, the remodeling market will grow by an annual rate of 3.5 percent.

From CertainTeed’s perspective, the benefit of an event like this is that the attendees are so excited by what they see and learn they will leave the event and go out and buy building products.  The impact is that quick.  In this economy the construction industry is a highly competitive place. Contractors and remodelers knowing they need to differentiate themselves waste no time in adding new ‘tools’ to their toolbox.

At a time when we are not ‘out of the woods’ as an industry,  it is obvious that building professionals find this show a significant value proposition making it well worth their time and resources.

If you were at JLC Live, let me know what you thought of the event.

 

Eric Nilsson

Eric Nilsson is Vice President, Corporate Marketing for CertainTeed Corporation

Will Solar Panels Ever Grace the White House Roof?

Lucas Hamilton

A firestorm has once again formed around the White House.  This time it is regarding solar roofing panels. You could say it is a wonderful example of where bureaucracy meets reality.  Bill McKibben an author, educator and founder of 350.org, a global organization focused on climate change journeyed to Washington, D.C. to ask President Obama to reinstall solar panels that Jimmy Carter had installed on the White House roof while serving as President.  The White House declined.

I am not advocating that the President uses 30-year-old solar panels on the White House, but the mission was a noble one. As a building scientist and alternative energy supporter representing a company that is investing in the research and development of solar roofing products, I do feel that considering solar panels on the White House would be a strong statement in support of solar technology. It would provide encouragement and serve as an example for all Americans. Even if it were a part of the White House roof, it would send the right message.

The move to alternative energy sources is generating jobs, helping us reduce our dependence on fossil fuels and lowering carbon emissions responsible for global warming.

The Department of Energy is very focused on addressing the issues of climate, reducing carbon emissions, research and development of alternative energy sources  and supporting programs like the Solar Decathlon, which promotes solar power and sustainable, energy efficient construction. But is this too passive a statement of support for solar?

The White House, a significant and very visible symbol of America, would be the perfect place to harness the power of sun.

McKibben, was a guest on David Letterman on September 1, talking about the White House trip, climate change and his October 10, 2010 event Work Party for Energy.

 Lucas Hamilton is Manager, Building Science Applications for CertainTeed Corporation

Green Generates Green for Philadelphia Builder

Lucas Hamilton

I had the pleasure of listening to Tad Radzinski, of Sustainable Solutions, a sustainability expert in the Philadelphia area, talk about an unusual and creative project that he recently worked on using a vegetative roof. 

From the Building Science perspective, what I like about vegetative roofs is the albedo of plants, which plays a large part in the benefit of live roofs, and the fact that they are literally cool roofs that naturally increase the insulation value on your structure (the r-value of the soil bed). Live roofs also reduce the amount of storm water runoff and city’s like Philadelphia are starting to reward building owners for moving to vegetative roofs.

 A few facts:

 1.) For most of us on municipal water, when you pay for a gallon of water you are also paying for a gallon of sewage treatment.

 2.) In older municipalities, the storm water and sewage lines are co-mingled.

 3.) When there is a rain event it can cause the water/sewer to overflow system capacity and be diverted into the rivers.

 4.) When this occurs, the municipality is fined for the overflow.  However, most cities would rather pay the small fine from the occasional rain event than to upgrade the storm water and sewage system.

Philadelphia recognized this and has started to reward builders who take steps to reduce site run-off by reducing the per gallon rate paid for the water they do use. By demonstrating the volume of run-off eliminated through the implementation of vegetative roofs and the reduction of hard surfaces such as paved parking areas, builders can qualify for water rate reductions. Applying this data to a life cycle assessment, we quickly see one more way that being green can save you green.

Lucas Hamilton is Manager, Building Science Applications at CertainTeed Corporation

Cautionary Tale on Installing Vegetative Roofs

LiveRoof

While presenting a workshop last week in Northern New Jersey hosted by Grubb & Ellis, Inc., a property management firm, I engaged in a conversation with an architect about a learning experience he encountered while installing a vegetative or live Roof.  

Vegetative roofs have been utilized in Europe for about 25 years and are gaining popularity in the United States especially for commercial buildings. From a building science perspective the thing I like about live roofs is the natural property of plants when it comes to resisting solar heat gain from infrared radiation.  The albedo, which is the surface reflectivity of the sun’s radiation, plays a large part in the benefit of a live roof.

On the hottest day in the summer, the average surface temperature of living plants in direct sunlight is only two degrees greater than the temperature of the ambient air. If you measured the temperature of a dark surface it could be as much 20 to 30 degrees higher than the ambient air.  Since plants never get more than two degrees hotter than the ambient air it makes them the obvious cool roof. 

While we are seeing an increase in cool roofs in building design, we can’t lose sight of common sense.  Now back to the architect and his tale.

This architect explained that the construction on the project was delayed which meant that the vegetative roof was installed in the summer.  By the time the plants arrived to be installed on the roof structure it was July, the hottest and driest time of year in northern New Jersey.  As a result, the first three months of the roofs’ life required watering.  The architect never imagined that he would have to water his roof for three months.

The designers and contractors never considered in the scheduling that the vegetative roof would need support if installed at the hottest and driest time of year.  The installation of the living component could have been delayed to more appropriately suit the environmental conditions but the benefit to the building of the vegetative albedo would not have been realized when it was actually needed the most- in the mid and late summer. It’s a great example of one of the many trade-offs we have to evaluate when building sustainably.  

 

Lucas Hamilton

Lucas Hamilton is Manager, Building Science Applications at CertainTeed Corporation

Proper Roof Ventilation is Critical

Lucas Hamilton

I was in Pittsburgh recently and had the pleasure of visiting a home that was about to be reroofed again – it has been reroofed several times in the last few years.  The house was between 30 – 40 years old and originally had wood shakes which were replaced with asphalt shingles.  The roof was under ventilated to begin with but when they went to the new system it made the problem worse. Each contractor that came along tried to do different things to deal with the problem that the homeowner was encountering.

While putting away Christmas decorations a few years ago, the homeowners noticed ice forming in her attic.  Originally, they thought it was from a roof leak so they replaced the roof.  However, the next winter the ice returned. The roof leak wasn’t the cause. It was insufficient attic ventilation. The house had a great deal of moisture build up in the attic space which was causing ice to form in the winter on the underside of the roof. 

The second contractor tried to add roof ventilation but did it in a way that didn’t help the situation.  He installed a power vent up high on the roof next to the ridge vent.  They put a humidistat on the power vent to activate the vent when the humidity rose in the attic.  The problem was that when the power vent kicked on, because of its position next to the ridge vent, it was pulling air in through the ridge vent and right out through the power vent which did not correct the humidity in the attic or solve the ventilation issue.

I met with them to discuss what was happening to the roof, make recommendations and work with the roofer to correct the ventilation issue. The roofer is going to optimize the power venting and eliminate the ridge vent. This was chosen because there is a concern that with the shape of the roof, you may never get sufficient soffit intake for the ridge vent alone to be sufficient.

As a result of the moisture in the attic, mold was developing on the roof decking.  While there are many ways to remediate mold, the homeowners wanted to take the most certain route which is to remove the contaminated wood. Of course, that adds cost to the project but is the best method of remediation.

Even though the knowledge base on ventilating residential roofs has expanded tremendously over the past 50 years,  professionals can sometimes have a difficult time properly ventilating a unique or challenging roof.  The homeowners were frustrated because they received different information from each contractor.  That can happen.

It is always a good idea to research the issues and ask questions.  In buildings where the attic ventilation requirements are not straight-forward the professional needs to look at the situation  from many angles to come to the right conclusion that solves the problem.   

Lucas Hamilton is Manager, Building Science Applications at CertainTeed Corporation

Rough Winter Has Been Hard on Roofs

If you’re like me, you’re still cleaning up from one of the roughest winters in memory, particularly here in the Northeast. Not only did landscaping and trees take the brunt of record snowfall, but the outsides of our homes took a beating as well, wreaking havoc on roofs.

Why am I talking about snow and ice during the spring? This is one of the biggest home improvement times of the year and chances are a number of roofs will need to either be repaired or replaced due to ice dams.

As a result of the constant freezing and thawing many roofs were subjected to ice dams. Ice dams are formed when heat from the inside of a home escapes into the attic and warms the roof decking during the winter. This heat, combined with heat from the sun, can melt snow on the roof. Melting snow then runs down toward the eaves as water. When it reaches the cold eaves and gutters it refreezes. This continual thaw and re-freeze process creates ice dams. The result is water can back up under the roof shingles where it can soak through the roof decking or wall sheathing, causing damage to attics, ceilings and walls. Ice dams make for some incredible icicles off the gutters, but the damage can be severe.

There are three ways to defend against the damage ice dams cause:

Attic Insulation - Insulation keeps heat from escaping from your home’s living space into your attic. You can add insulation batts or blown-in insulation to improve attic insulation. If the home was built before 1980 chances are that more attic insulation is needed.

• Attic Ventilation System – Unchecked moisture can promote mold, mildew, and wood rot. Natural or static ventilation systems consist of simple vent or covered openings in your attic. These are typically ridge vents, gable, eave, or roof vents. Many ventilation experts agree that externally baffled ridge vents combined with vented soffits are a very effective method for ventilating an attic.

Water-proofing shingle underlayment – This is only an option if the roof needs to be replaced. While water-proofing underlayment does not prevent the formation of ice dams, it will prevent backed up water from getting into the house in those roof areas where it is applied.

Making changes to prevent the occurrence of ice dams is critical for the health of the home and its energy efficiency. An unprotected roof is an ice dam crisis waiting to happen.

Jay Butch

Jay Butch is Senior Marketing Manager for CertainTeed Roofing