Business area System/product family System/product Exterior restore group. Sto restore Advanced Restoration for Building Façades

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1 Business area System/product family System/product Exterior restore group Sto restore Advanced Restoration for Building Façades

2 Sto restore Restoring building exteriors to protect the value of your investment. Long live your building. Sto s restore program enables you to safeguard your property s value, increase energy efficiency and refresh curb appeal. Sto restore pulls all the pieces together, offering building owners a single source for materials and services to meet all their maintenance and restoration requirements. Let a Sto professional team determine the right combination of restore services for your specific needs. Façade Restoration Experts Innovation, experience, service. Sto Strategic Contractors* bring this balance of qualities to your project. From cleaning and recoating to full repairs and recladding, façade restoration is a core competency of these contracting firms. Superior Products High-quality products from one manufacturer. Sto offers a full line of repair products for EIFS, stucco, concrete and masonry construction, as well as high performance coatings that extend the life of a building while reducing maintenance and enhancing curb appeal. Extended Protection Sto warrants the performance of its products with extended warranty protection, including 10-year coating warranties and 10-year extensions of existing Sto EIFS cladding warranties for qualified restoration projects. Service and Support Sto Technical Support offers a full array of services to meet the specific needs of your project: training, plan reviews, logistical support, application equipment for faster and better installation, and guide specifications and details. Design Services Do more than just refresh the color of your building. Sto Studio offers a service that our competitors just don t professional façade design, color renderings and architectural treatments to visualize a building in different design scenarios so you can weigh the options and identify the best solution. Sto restore gives buildings a new lease on life with expertly performed structural repairs and a renewed appearance. Contact the Sto Strategic Accounts Team at to get started on your restoration project. 1 Sto restore

3 Sto s restore program connects you with experienced restoration professionals. restore Program Overview Whatever condition your building exterior is in, Sto restore has a customized solution to help you regain the value of your investment, from cleaning to restoration of the entire façade. Dirt, Mold and Mildew Minor Damage Major Damage Unsightly / Moisture Intrusion Clean & Recoat Repair & Refinish Remove & Reclad Overclad Sto restore 2

4 Clean & Recoat A whole new outlook for your building s exterior. Airborne grime, splash-up from roadways and pedestrian traffic buildings get dirty, especially in urban areas. And when they get soiled, they look old and uncared for. This is not the image building tenants want to project. The clean and recoat process combines a thorough pressure washing and surface finishing with a high performance Sto coating. Sto coatings deliver far more than paint; they actually resist accumulation of dirt, mold and pollutants, preserving a building s value while enhancing its appearance and reducing maintenance needs. Sto coatings are integrally colored with high-quality pigments to complement building additions or to totally transform a structure s appearance. You ll see real, quantifiable results when you protect your building with a Sto high performance coating, including improved resistance to water, mildew, cracks and fading. Renew Before (above) Dirt and an aging finish make the building look old and uncared for. After (right) Sto cleaning and recoating instantly increases the value of the building. Sto dramatically improves the appearance of building exteriors by cleaning and finishing with a proprietary Sto coating, eliminating the soiling and fading that has occurred over time. It s one of the simplest, most costeffective ways to ensure a building communicates its value to tenants and visitors alike. 3 Clean & Recoat

5 Warranties Coating / Finish Warranty Terms Sto EIFS Warranty Terms StoCoat years N/A (Coating only) ReNew 10/10 10 years 10 years (Coating and underlying Sto EIFS) ReFinish 10/10 10 years 10 years (Finish and underlying Sto EIFS) Exposed surfaces are pressure washed before applying a Sto high performance coating to vertical walls. StoCoat Lotusan Your walls stay cleaner longer, thanks to the unique Lotus-Effect technology, a microtextured surface that beads water and helps dirt to wash off. Application of our patented StoCoat Lotusan provides longlasting protection for exterior walls. Sto restore 4

6 Repair & Refinish Stop exterior damage before it becomes a major problem. Delivery trucks, shopping carts, traffic and normal weathering cause wear and tear to exposed building surfaces. When small areas of wear develop, they should be repaired as soon as possible so they don t turn into significant damage that s more difficult and expensive to remedy. Sto Strategic Contractors* evaluate the extent of damage and apply a substrate-specific repair product to restore the building exterior to its original condition. Sto repair products are engineered for most substrates, including EIFS, stucco, concrete and masonry. After damage is repaired, a high performance Sto finish is applied to finish and seal the surface, protecting it from the elements and slowing down natural wear and tear. Now the exterior is safeguarded from wind-driven rain, UV rays, and mold and mildew. For ultimate protection, Stolit Lotusan finish keeps the structure looking better longer with Lotus- Effect technology, a microtextured surface that beads water and helps dirt to wash off with rainfall. Even minor damage to EIFS can cause problems with the energy efficiency and structural integrity of a building. Repair is simple and effective, while refinishing gives a fresh, new look. 5 Repair & Refinish

7 Sto Studio Sto Studio offers full-color renderings during the design and construction process to support decision making. Sto Studio first identifies specific needs and then generates alternative elevations so clients can weigh their design options. See the back cover for more information. Repair Exterior walls get damaged in the normal course of business, and they need to be repaired while damage is minor to prevent it from becoming major. A Sto support team will assist in looking for underlying causes of damage and in determining the appropriate repair methods to complete the work quickly. Sto restore 6

8 Remove & Reclad New cladding that performs far better, far longer. Sto offers you options. Instead of extensive repairs, it s often more efficient to remove all existing cladding. Replace with a superior, sustainable Sto wall cladding system that s extremely durable, improves building performance and looks fresh far longer. Sto can help you determine when it s more efficient and cost effective to remove problem cladding and replace with a Sto cladding system. Sto uses a systems approach to restoration, assisting in diagnosis of the condition of the building exterior and then in the selection of the right products and processes to bring it to the desired level of performance. When new Sto cladding is in place, your building will work for you and with you, looking attractive for years, improving indoor air quality and lowering overall lifecycle costs. Reclad When it makes more sense to reclad than repair, a Sto wall cladding system is the low maintenance, high performance solution. Sto claddings are extremely durable and look better longer, helping to retain a building s value over time. Sto can also overclad brick, block and stucco walls, dramatically improving curb appeal and extending the life of the building s exterior. 7 Remove & Reclad

9 Sto Strategic Contractors* Sto restore connects building owners who want to increase the value of their property with independent contractors whose core competency is façade restoration. These contractors use Sto materials to perform all the services needed, so you are fully backed by Sto s warranties and expert technical support services. After the old cladding is removed, StoGuard waterproof air barrier is applied to protect the substrate, followed by an energysaving EIFS cladding. Sto restore 8

10 Overclad New hope for old brick, block and stucco. Sto insulated wall claddings have the power to transform an unsightly, inefficient older building. Installing a new StoTherm Lotusan NExT cladding over existing brick, block or stucco gives a fresh, new look in addition to significantly increasing thermal heating and cooling efficiency. During a building s lifetime, it can require major exterior renovation. Overcladding is an excellent way to extend a building s effective life that s far less expensive than rebuilding. The impact of overcladding with Sto is dramatic. Take a building diminished by wear and tear and bring it up to the standards of today s structures both in appearance and energy efficiency. More than just a pretty restoration, Sto cladding systems stay looking good longer, thanks to the self-cleaning properties of Stolit Lotusan textured finish, which helps nature do its job by gently repelling dirt so it can rinse away with each rainfall. A mid-century brick building gets a new look and increased energy savings with StoTherm Lotusan NExT. 9 Overclad

11 StoTherm Lotusan NExT Sto s latest EIFS innovation is StoTherm Lotusan NExT, which integrates three key components into an energy-efficient insulated wall cladding system: StoGuard continuous waterproof air barrier StoTherm exterior insulated cladding Stolit Lotusan textured finish with patented self-cleaning properties This state-of-the-art system stays attractive for years, improves indoor air quality and lowers overall lifecycle costs. Sustainable All Sto coatings and finishes are vapor permeable, easy to apply, safe and nontoxic, and have low VOCs. We incorporate sustainable practices throughout our operations, earning us ISO certification for our environmental management system. Many of our products help reduce the environmental impact of construction by saving energy and using materials with recycled content. Sto restore 10

12 Sto Studio Sto Studio is a unique visual service that facilitates design and color decisions. With Sto Studio s full-color, professional-grade renderings, you can see your building as it would look in different design scenarios. This gives you confidence in your choices, leaving you more satisfied with the outcome. To find out more, call or stostudio@stocorp.com. Before Rendering After Support Our skilled and experienced technical services advisors are ready to support you regarding all aspects of Sto products and services. To reach an advisor in your area, contact your local Sto distributor or call You can also find useful information to download and print on including Material Safety Data Sheets, product bulletins, color selection charts and much more. Sto Corp Camp Creek Parkway Building 1400, Suite 120 Atlanta, GA Phone Toll Free Fax * Sto Strategic contractors are independent contractors who are responsible for labor and workmanship. Any labor or workmanship warranties are provided by the contractor. Sto Corp. provides limited materials warranties, samples of which are available on request. ATTENTION Sto products are intended for use by qualified professional contractors, not consumers, as a component of a larger construction assembly as specified by a qualified design professional, general contractor or builder. They should be installed in accordance with those specifications and Sto s instructions. Sto Corp. disclaims all, and assumes no, liability for on-site inspections, for its products applied improperly, or by unqualified persons or entities, or as part of an improperly designed or constructed building, for the nonperformance of adjacent building components or assemblies, or for other construction activities beyond Sto s control. Improper use of Sto products or use as part of an improperly designed or constructed larger assembly or building may result in serious damage to this product, and to the structure of the building or its components. STO CORP. DISCLAIMS ALL WARRANTIES EXPRESS OR IMPLIED EXCEPT FOR EXPLICIT LIMITED WRITTEN WARRANTIES ISSUED TO AND ACCEPTED BY BUILDING OWNERS IN ACCORDANCE WITH STO S WARRANTY PROGRAMS, WHICH ARE SUBJECT TO CHANGE FROM TIME TO TIME. For the fullest, most current information on proper application, clean-up, mixing and other specifications and warranties, cautions and disclaimers, please refer to the Sto Corp. website, S626C 12/09 VEN5609 Printed in the U.S.A.

13 Benefits of Continuous Insulation and Air Barriers StoTherm and Sto Therm NExT Their Effects on Energy Consumption Reduction By Chris Norris, P.E, P.Eng, LEED AP, CEI With recent changes in energy codes continuous insulation is now required in six out of eight U.S. climate zones. Air barriers are starting to be adopted on a state by state basis, but are not currently required in most states. This paper presents a study that evaluates the relative benefits of EIFS continuous insulation and EIFS continuous insulation combined with an air barrier over baseline energy code compliant assemblies. Energy Codes Rising energy costs and environmental concerns have driven changes in energy codes and in construction practices, which are aimed at reducing energy consumption. Rising energy costs have also resulted in an increased focus on retrofit of existing buildings to reduce energy consumption. Controlling conductive heat transfer through exterior walls and controlling air leakage through the building enclosure are two key aspects to reducing energy consumption. Current US energy codes require continuous insulation in six of the eight climate zones. Historically U.S. state energy codes have focused on conductive heat transfer through prescriptive R-value and U-values for building enclosure systems. Lesser focus has been place on air leakage control and air barrier requirements. The first modern North American quantitative code requirement for air barrier materials was implemented in the National Building Code of Canada in the mid 1980 s. In 2001 Massachusetts became the first state to incorporate a quantitative air barrier code requirement, Wisconsin, Michigan, Rhode Island, Georgia, Minnesota and Florida have since included air barrier requirements in their state codes. Exterior Insulating and Finish Systems (EIFS) The insulation benefits of EIFS have long been recognized and with recent energy code changes EIFS is becoming an increasingly attractive and economical approach to providing continuous insulation. The provision of continuous insulation requires that the exterior cladding be cantilevered out from the wall structure by the thickness of the insulation. This cantilevering of loads can present structural challenges resulting in increased structural costs. This can be particularly challenging for retrofit projects where the original walls were not designed to accommodate these additional loads. The light weight of EIFS makes it a very attractive approach for the provision of continuous insulation for both new construction and for retrofit applications. EIFS was originally introduced to North America as a barrier system, but both barrier and drainable systems are now available. StoTherm is a barrier EIFS, which provides continuous insulation but does not include an air barrier. StoTherm NExT is a drainable EIFS, which provides continuous insulation installed over a StoGuard fluid applied air/ weather barrier.

14 Energy Modeling Objectives The objective of the energy modeling was to evaluate the relative benefits of StoTherm and StoTherm NExT systems for new construction and for energy retrofit applications. The StoTherm system provides continuous insulation without an air barrier, while the StoTherm NExT system incorporates an air barrier into the system. A prototype medium three-story office building was modeled for Dallas, Seattle, and Toronto climates. Various scenarios for retrofit of existing buildings and for design upgrades for new construction were considered. The baseline case buildings were modeled as meeting the minimum requirements of ASHRAE for existing buildings and ASHRAE for new buildings. A baseline air leakage rate of 1.55 cfm/sf of above grade envelope surface normalized to 1.57 psf (75 Pa) was used. 1 Existing Building Baseline: The baseline existing building was as follows: 53,600 sf three-story building meeting minimum ASHRAE requirements o o o Batt insulation in stud space for Seattle and Dallas, continuous insulation for Toronto climate. 33% glazing (minimum code compliance for U-values, and SHGC values) Air leakage rate: 1.55 cfm/ft 2 envelope area at 1.57 psf (75 Pa) pressure difference normalized to 0.08 psf (4 Pa). Steel stud framed exterior walls with brick veneer Existing Building Retrofit: Two EIFS retrofit cases were considered for each climate zone. For retrofit case one a 2 StoTherm system was added to the baseline model without changing the building air leakage rate. For retrofit case two a 2 StoTherm NExT system was added to the baseline model with the air leakage rate reduced to 0.4 cfm/ft 2 at 1.57 psf (75 Pa) pressure difference normalized to 0.08 psf (4 Pa). Figure 1: Retrofit Case One Figure 2: Retrofit Case Two New Building Baseline: 1 ASHRAE 2009 Handbook of Fundamentals, p

15 The baseline existing building was as follows: 53,600 sf three-story building meeting minimum ASHRAE requirements o o o Batt insulation in stud space and continuous insulation (minimum code compliance level of insulation) 33% glazing (minimum code compliance for U-values, and SHGC values) Air leakage rate: cfm/ft 2 envelope area at 1.57 psf (75 Pa) pressure difference normalized to 0.08 psf (4 Pa). New Building Energy Design Upgrade: The Energy Design Upgrade cases replace brick with StoTherm NExT. In all upgraded cases the air leakage rate was reduced to 0.25cfm/ft 2. The thickness of the exterior EIFS was varied from code minimum up to a maximum of 10 of EIFS. Figure 3: Energy Design Upgrade Model Methodology The prototype buildings used for the modeling were U.S. DOE Commercial Reference Buildings models, Version The Commercial Reference Buildings use the Design Flow Rate model for air leakage rate modeling. Air infiltration is assumed in perimeter zones only and air Infiltration is reduced to 25% of full value when the ventilation system is running. This modeling does not account for stack effect. Had stack effect been included a slightly higher air leakage rate would be expected. While air leakage is typically specified and measured based on a differential pressure of 1.57 psf (75 Pa) across the building enclosure, the actual pressure across the building enclosure under normal operating conditions is substantially lower. For this reason, the air leakage rates used in the energy models are normalized to a pressure of 0.08 psf (4 Pa) following U.S. Department of Energy guidelines 3. Taking a base air leakage rate of 2 Deru, M.; Field, K.; Studer, D.; Benne, K.; Griffith, B.; Torcellini, P; Halverson, M.; Winiarski, D.; Liu, B.; Rosenberg, M.; Huang, J.; Yazdanian, M.; Crawley, D. (2010). U.S. Department of Energy Commercial Reference Building Models of the National Building Stock. Washington, DC: U.S. Department of Energy, Energy Efficiency and Renewable Energy, Office of Building Technologies. 2 The procedure is described in Gowri, K.; Winiarski, D.; Jarnagin. R. (2009). Infiltration Modeling Guidelines for Commercial Building Energy Analysis. U.S. Department of Energy Pacific Northwest National Laboratory. 3

16 0.4 cfm/ft 2 of above grade wall area at 1.57 psf (75 Pa) and normalizing this to an air leakage rate at 0.08 psf (4 Pa) results in an air leakage rate of cfm/ft 2 of exterior surface area. The air leakage rates for the 0.25 cfm/ft 2 and 1.55 cfm/ft 2 at 1.57 psf were then scaled from this base case. Heating, cooling, lighting, and interior equipment energy consumption were modeled for each load case at 10-minute intervals and the results are summarized on a monthly usage basis in units of kilowatt hours (kwh). This data was then used to calculate heating and cooling energy usage on an annualized basis. Annual energy costs, annual energy savings over the base case, and an annual carbon equivalent were calculated based on the annual heating and cooling costs. Energy Model Results The energy modeling results are presented graphically in the following charts:

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21 Key Findings The following is a summary of key findings from the energy modeling: 1. Substantial energy savings can be realized by adding a StoTherm NExT system. Annualized heating and cooling energy savings ranged from approximately 20% to 45% with greater savings achieved in colder climates 2. In all climate zones, reducing air leakage was found to have a much greater impact on energy savings than adding continuous insulation alone. StoTherm NExT increased energy savings by 450% to 950% over StoTherm alone depending on the climate zone, with greater savings achieved in colder climates. 3. The following annualized heating and cooling energy savings were realized by adding a 2 StoTherm NExT system with air leakage controlled to psf air barrier relative to a baseline ASHRAE 90.1, 2007 new building: a. Toronto: 43% energy savings b. Seattle: 36% energy savings c. Dallas: 20% energy savings 4. The following annualized heating and cooling energy savings were realized by retrofitting a baseline ASHRAE 90.1, 2004 building with 2 of EIFS and a psf air barrier: a. Toronto: 37% energy savings b. Seattle: 34% energy savings c. Dallas: 21% energy savings 5. StoTherm NExT meets the continuous insulation energy code requirements. The adhesive attachment of the system eliminates thermal bridging, and the light weight of the system allows for additional continuous insulation to be added with minimal structural implications. 6. There is a diminishing return in energy cost savings as R-value is increased. Conclusions The modeling demonstrates that both StoTherm and StoTherm NExT are effective in reducing energy consumption both for new construction and for retrofit applications. The air barrier that is included as part of the StoTherm NExT system offers significant improvement in energy efficiency of the assembly as compared to the StoTherm system. Although durability was not considered within this study, the drainability of the StoTherm NExT and the hygrothermal properties of EIFS also improve the long term durability of the wall assembly. The beneficial hygrothermal properties of EIFS systems has been demonstrated in prior studies by Oak Ridge National Laboratories 4. Chris Norris is a Building Science Specialist with Morrison Hershfield. He leads new construction and retrofit building enclosure projects across the country. 4 ORNL / EIMA exterior wall cladding performance study dated August 15, 2008 for additional information on the moisture control properties of EIFS wall assemblies.