Knowing Your Home: Windows 101. Presented by: Fred Cortright

Transcription

1 Knowing Your Home: Windows 101 Presented by: Fred Cortright

2 Use, Insist On Lead Safe Practices

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4 Multiple Functions Passive Light Source Passive Ventilation Passive Heat Gain (in Cold Weather) Prevent Air Infiltration Prevent Water Infiltration Prevent/Reduce Dust Infiltration Prevent Pest Infiltration Reduce Noise Infiltration Reduce Ultraviolet Light Infiltration Security Egress

5 Multiple Improvement Options Window Rehabilitation Exterior Storm Windows Interior Storm Windows Sash Modification Insert Replacement Windows Complete Window Replacement

6 Options Involve Competing Claims Competing Qualities Confusing Terminology Why Should My SHGC be High, My U Low, and My Low-e Southern?

7 Okay, Smart Guy, What s the Best, the Right Choice?

8 The Right Choice is Situation Specific

9 The Right Answer Addresses Specific: Desired Outcomes (Prioritized) Existing Structural Realities Available Resources Money, Time & Energy, Planetary

10 Desired Outcomes re: Energy Performance Goals Environmental Performance Goals Cost General Performance Goals Aesthetic Goals Disruption to Occupants Durability / Maintenance

11 Structural Realities Condition of House (Sealed? Insulated?) Condition of Frames and Sashes In Sunlight or Shade? Climate

12 Available Resources Your Money Your Time & Energy The Planet s Air, Water, Sand, Aluminum, Landfill Space

13 and Energy Sources

14 Saving Energy : A Brief History

15 Y STAR

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17 Calculating Environmental Costs (vs. Energy Savings) Operating Energy Embodied Energy Life Cycle of Materials Taken Together = Carbon Footprint (Say What?) Calculating co2e

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21 Rule of Thumb: co2e Calculations Favor Preservation Over Replacement

22 Complete Window Replacement Involves: Removing (then Replacing) Casing & Trim Removing Old Window and Frame Reconfiguration of Rough Opening Changes as Needed for Proper Installation

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25 Complete Window Replacement Pros Potentially Very High Performance Opportunity to Change Window Size, Location Integration with Enclosure Retrofit Low Maintenance Cons Affects Interior and Exterior Appearance Not Reversible Significant Disruption to Occupants Durability Concerns, Depending on Option Chosen

26 Complete Window Replacement Relative Cost: Most Expensive Option Relative Performance: Moderate to State-of-the-Art, Depending on Option Chosen Relative Environmental Costs/Impact: High to Extremely High

27 Insert Replacement Windows Involves: Removal of Old Sashes Reconfiguration of Window Frame Should Include Partial Rehab of Existing Frame

28 Insert Replacement Windows Pros Improves Air Infiltration, Conductance, Solar Gain Performance Reduces Potential for Interior Condensation Low Maintenance Little Disruption of Occupants Cons Affects Interior and Exterior Appearance Not Reversible Vision Area Reduced Low Durability At Low End, Mechanical Issues

29 Insert Replacement Windows Cost: Moderate to High, Depending on Options Chosen ($270 to $800 per Window) Performance: Moderate to High, Depending on Options Chosen Relative Environmental Costs/Impact: High

30 Interior Barriers Done in Conjunction with Window Rehabilitation Removable and Permanent Options Involves: Precise Sizing Following Recommended Installation Practices

31 Interior Barriers Pros Reversible Maintains Exterior Appearance Improves Air Infiltration, Conductance Performance Low Maintenance Little Disruption of Occupants Cons Alters Interior Appearance Potential Interstitial Condensation (Durability Concern) Requires Seasonal Installation and Removal Potential to Impact Egress

32 Interior Barriers Relative Cost (Removable): Low Relative Cost (Permanent): Low to Moderate, Depending on Option Chosen Relative Performance: Low to Moderate,Depending on Option Chosen and Quality of Installation Relative Environmental Impact: Low to Moderate, Depending on Option Chosen

33 Exterior Storm Windows Involves: Done in Conjunction with Window Rehabilitation May Require Slight Modifications to Frame Moderately Precise Sizing Ladder/Scaffolding Work

34 Exterior Storm Windows Pros Improves Air Infiltration, Conductance, Solar Gain Performance Maintains Interior Appearance Reversible Reduces Potential for Interior Condensation Low Impact on Occupants Cons Changes Exterior Appearance Potential Interstitial Condensation (Moderate Durability Concern)

35 Exterior Storm Windows Cost: Low to Moderate Depending on Options Chosen Performance: Moderate to High, Depending on Options Chosen Relative Environmental Impact: Moderate

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37 Window Rehabilitation Involves: Range of Activities Depending on Window Condition and Desired Outcomes Relative Cost: Low to Moderate, Depending on Needs/Choices Relative Performance: Low Relative Environmental Impact: Lowest

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40 Sash Modifications/Replacement Involves: Should be Done in Conjunction with Window Frame Rehabilitation Replacing Sash-Weight System, allowing retrofit of Weight Pockets Workmanship Sensitive: Tight Tolerances Possible Modifications Include: Improved Pane Configuration Adding Gaskets and Other Gap Fillers

41 Sash Modifications/Replacement Pros Improves Air Infiltration, Conductance Performance Maintains/Can Match Interior and Exterior Appearance Reduces Potential for Interior Condensation Durability Cons Relatively High Maintenance

42 Other Rehab Actions Remove sashes by removing stops and parting bead Clean frame and sashes Reglaze Panes as Needed Caulk and Seal Frame Corners and Joints [Optional] Cut Grooves in Sashes for Gaskets V-Groove at Jambs and Meeting Rails Bubble at Head and Sill [Optional] Replace Weight System with Spring System Seal and Insulate Weight Pockets Prime and Paint Frame and Sashes [Install Gaskets] Reinstall, Testing and Making Adjustments as You Go

43 Also Consider Honeycomb blinds Heavy Curtains That Overlap Trim Your Behaviors

44 Find Your Sweet Spot: The (Right) Answer Where All the Lines Cross

45 The Sweet Spot (Generally Speaking) First Put $1000 into Sealing and Insulation You Get Equal (or Better Energy) Savings with Low Environmental Impact Rehab Existing Windows to Reduce Leakage Use Honeycomb Blinds and Lined Curtains Install Low U-Value Exterior Storms (.35 or lower).6 (or Better) SHGC on South Side Why? Combines: Low Environmental Impact Low Cost High-Moderate Energy Savings

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47 A Few Terms SHGC (Solar Heat Gain Coefficient): Measures Solar Heat Flow (Radiation) Recommended:.42 and higher;.6 or higher on south side U-value: Measures Non-Solar Heat Flow (Conduction over Time) Recommended:.35 or Lower Gas-Filled: Argon or Krypton, to Increase Resistance to Heat Flow Low-e (Low Emissivity): Glaze that Reflects Long Wavelength Radiation, Allows Short Wavelength Radiation (Sunlight) to Pass Through Cost %; Reduces Energy Loss 30-50% Available as DIY Film

48 s/fy13osti/55219.pdf

49 Fred Cortright