Owens Corning

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Owens Corning

  1. 1. Outline | Three Key Areas of Focus • 1 Air Sealing • 2 Insulating – Why & how houses leak – Material choices GHBA Custom Builder Council – Importance – Proper installation Air Sealing & Insulating Residential Buildings – Measuring air leakage – How infrared – Sealant choices Sealant choices thermography can help thermography can help – Ventilation • 3 Bonus Room Comfort 20 September 2011 – Why it is such a challenge – How it can be addressed with  Dave Wolf, Ph.D. Owens Corning, Science & Technology effective air sealing & insulating Confidential Information 2 Air Sealing How leaky is a typical house?   AIR SEALING Leaky enough to exchange all of its volume with the outside every two hours. Median air leakage of existing homes is 0.5 NACH. 3 Residential Energy, Krigger & Dorsi. 4Air Sealing Air SealingWhere do houses leak? | Attic Where do houses leak? | Walls Light fixtures Chimneys Wall ceiling Wall-ceiling intersections Hatches Vents Bath fans Soffits/Chases Drawing from “The Facts About Insulation And Air Infiltration,” NAIMA Pub. No. BI 480. Drawings from “Attic Bypasses,” Minnesota Department of Commerce Energy Information Center. 5 6 1
  2. 2. Air Sealing Air SealingWhy do houses leak air? What are the benefits of reduced air leakage? 1 Experience dramatic savings on home heating and cooling See immediate savings of up to one‐third  on heating and cooling. Enjoy a more comfortable home More consistent room‐to‐room  comfort with fewer  drafts. Feel warmer  in the  winter, cooler in the summer. 2 Help prevent moisture from entering walls Reduce conditions that can lead to the growth of mold. Diminish outside noise penetration Up to 40% less outside noise from traffic and neighbors,  as compared  to traditional  spray foam systems. 3 Defend against insects and pests Block gaps and holes to create a first line of defense  against the critters and pests  that bug your family. Improved indoor air quality Help seal out allergens  and pollutants to create a healthier  indoor environment  with  the inclusion of a mechanical air exchanger. Drawing from Green Building Advisor website. 7 8Air Sealing Air SealingHow do you measure air leakage? Sealant Choices Pros Cons• The “Blower Door” test. • Low cost • Poor flexibility (without  silicone) & compressibility – Pressurizes/depressurizes  Caulk • Requires clean surface the house to measure  • No hard‐to‐reach joints leakage. • Low cost • Poor flexibility &  • Good expansion compressibility – Blower is quickly inserted  Can Foam • Requires clean surface into the door of the house. into the door of the house – The amount of air leakage is  • Excellent flexibility &  • Moderate cost commonly normalized to the  Spray Applied  compressibility house volume – air changes  Flexible Foam • Self‐cleaning spray • Seals hard‐to‐reach joints per hour at 50 Pascals of  • Excellent expansion • High cost pressure (ACH50). Full Cavity  • Seals hard‐to‐reach joints • Does not address all joints • Insulates Spray Foam 9 Confidential Information 10Air SealingVentilation• Old (and accurate) adage … build tight, ventilate right. – Infiltration (uncontrolled) – Ventilation (controlled)• Types of ventilation Types of ventilation – Supply – Exhaust (not recommended for Houston climate) – Balanced with heat recovery INSULATING• The builder should consult with the HVAC contractor on the selection and installation. Confidential Information 11 12 2
  3. 3. Insulating InsulatingMaterial & Application Choices Fiber Glass• Fiber Glass • Advantages – Inexpensive• Cellulose – Easy to install• Spray Polyurethane Foam – Excellent fire & moisture  resistance• Foam Board • Disadvantages – Batts must be custom fit for  irregularly shaped cavities  and obstructions – Does not air seal Confidential Information 13 Confidential Information 14Insulating InsulatingCellulose Spray Polyurethane Foam (SPF)• Advantages • Advantages – Inexpensive – Easily handles irregularly shaped  – Easy to install cavities and obstructions – Provides some air resistance when  – Air seals the cavities tightly packed • Disadvantages g• Disadvantages – Expensive – Absorbs water – Requires building evacuation – Can settle in wall cavities during installation and for – Requires chemical treatment to avoid  24 hours thereafter fire hazard – Requires highly trained installers – Does not air seal Confidential Information 15 Confidential Information 16InsulatingFoam Board• Advantages – Continuous thermal break (not interrupted by the framing) – Can function as the water barrier, if  properly detailed• Disadvantages – May require window/door jamb  extensions, depending on the thickness. – Requires some form of shear bracing  when applied instead of OSB or  plywood. Confidential Information 17 Confidential Information 18 3
  4. 4. Insulating More Information • 12‐page pictorial  document that includes  quality checklists, critical  details and more. www.owenscorning.com Confidential Information 19 Confidential Information 20 Insulating How infrared thermography can help … BONUS ROOM COMFORT Confidential Information 21 22 Bonus Room Comfort Bonus Room Comfort What affects comfort? Relative Humidity The Silver Bullet … Moist air that infiltrates in theAir Temperature summer makes a person feel warmer. Moist air that exfiltrates in the winter • Bad news … There isn’t one. makes a person feel cooler. • A bonus room is the most thermally challenging  place in the house – Five‐sided exterior enclosureAir Flow RadiantAir infiltration givesthe sensation of Temperature Air infiltration and/ordraftiness. inadequate insulation • The details of construction are really important. effects the wall surface temperature, • Thermal barrier • Windows which, through • Air barrier • HVAC radiation, affects • Lighting Source: Krigger, J. & Dorsi, C., Residential Energy, Cost Savings and Comfort for Existing Buildings, 4th ed., Saturn Resource Management, 2004. thermal comfort. Confidential Information 23 Confidential Information 24 4
  5. 5. Bonus Room Comfort Bonus Room ComfortThermal Barrier Thermal Barrier | Walls• Two important requirements for the proper  • Insufficient  installation of insulation sheathing on  the knee wall 1. Minimize/eliminate air leakage through the insulation  by ensuring a 6‐sided cavity • Think of a sweater … very warm with no wind blowing; not so Think of a sweater …  very warm with no wind blowing; not so  Air leakage paths warm with the wind blowing.  The 6‐sided cavity is the  “windbreaker” over the “sweater”. 2. Ensure contact with the surface that you want to  insulate • Think of a blanket …  very warm when in contact with the body;  not so warm when separated Confidential Information 25 Confidential Information 26Bonus Room Comfort Bonus Room ComfortThermal Barrier | Walls Thermal Barrier | Walls• Open stud cavities • Double walls attic space Air leakage path Air Double-depth cavity; leakage unbacked insulation paths Confidential Information 27 Confidential Information 28Bonus Room Comfort Bonus Room ComfortThermal Barrier | Walls Thermal Barrier | Floor• Unbacked walls • Contact with the sub‐floor is essential Correct Wrong His & Hers closet All arrows show air leakage paths and areas of unbacked insulation. Source: Krigger, J. & Dorsi, C., Residential Energy, Cost Savings and Comfort for Existing Buildings, 4th ed., Saturn Resource Management, 2004. Confidential Information 29 Confidential Information 30 5
  6. 6. Bonus Room Comfort Bonus Room ComfortThermal Barrier | Floor Thermal Barrier | Ceiling• Piping creates a  • Continuous and aligned challenge for achieving  air baffles in cathedral  contact with the sub‐ ceilings keeps the  floor. warm/cold air from  p g seeping into the • Could the plumbing  insulation. contractor apply a rigid  insulation between the  pipes and sub‐floor (e.g.,  foam)? Confidential Information 31 Confidential Information 32Bonus Room Comfort Bonus Room ComfortAir Barrier | Walls Air Barrier | Floor Bonus Room• Same examples as with the thermal barrier … Garage House All drywall Floor temperature penetrations is affected. must be sealed. Air leakage paths Air leakage paths Air leakage path Double-depth cavity; All drywall unbacked insulation All arrows show air leakage terminations paths and areas of unbacked insulation. must be sealed. Confidential Information 33 Confidential Information 34Bonus Room Comfort Bonus Room ComfortAir Barrier | Ceiling Air Barrier | Ceiling• Seal around recessed lights. • Seal around exhaust fans. Source: Retrofit Techniques & Technologies: Air Sealing – A Guide for Contractors to Share with Homeowners, U.S. Department of Energy, 2010 Confidential Information 35 Confidential Information 36 6
  7. 7. Bonus Room Comfort Bonus Room ComfortAir Barrier | Ceiling Air Barrier | Ceiling• Seal around duct boots. • Seal the top plates. Sealant Without a seal, the air from the duct boot entrains unconditioned attic air at the drywall interface. Confidential Information 37 Confidential Information 38Bonus Room Comfort Bonus Room ComfortWindows HVAC• Minimize their use in bonus rooms • Things to consider – Windows are a weak link in the wall’s thermal barrier. – Duct size • Is it large enough for the length of run and higher thermal load  associated with a bonus room?• Consider higher performance windows on south‐ – Duct kinks g g facing and west‐facing walls of bonus rooms • The attic space above a bonus room is often smaller than the rest The attic space above a bonus room is often smaller than the rest  – Low‐e coatings for a cooling climate, like Houston. of the house, making duct kinks more likely. – Duct sealing • Prevents loss of conditioned air to the attic (supply) and gain of  unconditioned air from the attic (return).  – Returns • Bathroom & closet doors are often closed for privacy, which makes  the presence of a return  duct more important. Confidential Information 39 Confidential Information 40Bonus Room ComfortLighting MORE INFORMATION• Bathrooms typically have the largest  Books Residential Energy, Krigger & Dorsi concentration of artificial lighting of any  room in the house Websites • Written • www.greenbuildingadvisor.com• Incandescent lighting will worsen a Incandescent lighting will worsen a  • www.buildingscience.com g • Video comfort problem in summer months • www.homeenergypros.lbl.gov • www.bestofbuildingscience.com• Compact fluorescent lights (CFLs)  significantly reduce this thermal load QUESTIONS? Confidential Information 41 42 7

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