House insulation — Appropedia The sustainability wiki

House insulation - Appropedia The sustainability wiki

Contents

[edit ] ABSTRACT

The basic idea is to use the appropriate insulation within your home to save on heating and cooling costs. There are easy fixes and many new technologies in insulation that will prevent thermal loss year round. The expenses might seem high but will be able to pay for themselves in years and create a more energy efficient environment. This article will discuss the different options and procedures available.

[edit ] Physics Principles of Insulation

[edit ] Building Materials

Insulators

  • Choice ones that «retard the flow of heat from one object to another»
  • High «resistance to heat transfer
  • Porous Materials are Great Insulators

- This is due to the air in the pores acts as a «Good insulator «

  • Choose darker objects = better emitter and absorber
  • Darker objects absorber/emitter than white
  • Thermos = bottle inside a bottle

- Device to reduce heat transfer — 2 bottles separated by a vacuum = heat transfer from to inside chamber

[edit ] Types of Insulation

4 BASIC TYPES OF INSULATION

Loose-fill Insulation

  • Materials included in:
    • loose fibers or fiber pellets
    • Made of Cellulose fibers chemically treated to be moisture and fire resistent
    • Fiberglass and Rock Wool = [Blow-in Blanket System] (BIBS)
    • cost more then batt insulation
  • Benefits/Positives
    • Fills small cracks/crevices easier
    • Reduces air Leakage better
    • Better sound reducer (then batt insulation)
    • R-3 to R-4 value per inch
    • Cellulose fiber (by 30%) then loose-fill rock wool

Batt and Blanket Insulation

  • Materials Include:
    • Made of Mineral Fibers (fiberglass or rock wool)
  • Benefits/Positives
    • Least expensive wall insulation material
    • Best for Standard joist/rafters/studs
    • Build in radiant barrier backing
    • Come in long rolls that can be cut to desired length
    • R-value of Approximately R-3 per inch thickness

Rigid Board Insulation

  • Materials Include:
    • Made from fiberglass, polystyrene, or polyurethane
  • Benefits/Positives
    • Come in variety of thicknesses
    • R-value is the HIGHEST = R-4 to R-8 per inch
  • Uses
    • Reproofing work on flat roofs
    • Basement Walls
    • Perimeter insulation at concrete slab edges
    • Cathedral Ceilings
    • Must be covered with 1/2 inch gypsum board in used inside
    • Must be covered with Weather-proof facing if used exteriorly
  • Uses
    • Insulate below floors, above ceilings, and within walls

Spray Foam Insulation

  • Materials include:
    • Two-part liquid containing polymer and foam agent
  • Uses
    • Sprayed on Wall, ceiling, and floor cavities
    • Expands to sold cellular plastic with many air cavities
    • Good for irregular shaped areas and around obstructions
  • Negatives
    • Require specific machinery to spray/mix

www.ornl.gov/sci/roofs+walls/insulation/ins_08.html

US_natural_insulation_comparison will also provide a good comparison of natural insulation for your benefit.

[edit ] Proper Procedures

  • Monitor your energy usage form year to year
  • Call Local Power Company/Contractor about an energy audit
  • Measure depth of insulation between joists in attic if unheated
  • Re-caulk windows, doors, siding, dampers, vents
  • Replace insulation with newer/more appropriate insulation for area
  • Add vapor barrier to all exterior walls
  • If insulating the floors above an unheated basement, place insulation facing toward floor
  • To insulate your basement use rigid insulation boards.


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