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Insulation Overview

Insulation Overview. Convection – through movement of air or fluids . Conduction – through solids. Radiation – light or non-visible waves. The Basics. Three types of heat flow:. Flow of heat (or cold) occurs when there is a temperature difference.

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Insulation Overview

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  1. Insulation Overview

  2. Convection – through movement of air or fluids • Conduction – through solids • Radiation – light or non-visible waves The Basics Three types of heat flow: Flow of heat (or cold) occurs when there is a temperature difference. Insulation slows the flow of heat (or cold).

  3. Fibrous • Fiberglass, cellulose, etc. • Cellular Foam • Polystyrene, polyurethane, etc. • Radiant Barriers • Foil films, etc.. Insulation Types

  4. Top Top Wall Example

  5. Batts Fiberglass Insulation Forms • Loose • Fiberglass, cellulose • Wet Spray • Cellulose, polyurethane foam, fiberglass • Rigid Board • Fiberglass, polystyrene foam, other foams • Roll Goods • Fiberglass, foil, etc…

  6. THERMAL Resistance to heat flow = R-value R-value depends on material, thickness & density Top Interior Wall Side Floor Ceiling Key Performance Attributes • MOISTURE CONTROL • Facings (e.g. – coated paper, foil) • Polyethylene vapor barrier • SOUND CONTROL • Airborne noise • Through cavity walls and floors/ceilings FIRE/SMOKE RESISTANCE

  7. Generally contractors blow loosefill (fiberglass or cellulose) insulation into attics for superior coverage Both types of material work – cellulose is a little more dense than fiberglass DIYers buy rolls from big box retailers – the rolls work, but tend to leave gaps which reduce the thermal efficiency of the system Attic Insulation

  8. We’ll suggest to homeowners that they should blow their attics to an R-60, but we can’t really tell them they’ll get an R-60 – we can only tell them how much we’re adding DOE ZONES

  9. It may seem like attic vents defeat the purpose of insulation, but they're a vital part of keeping fresh air circulating through your home. An unventilated attic can trap heat during the summer, raising the indoor temperature by several degrees and putting a strain on your air conditioner. During the winter, warmer air trapped in the attic can cause ice dams than can lead to serious roof damage. Attic vents can be positioned in several ways. New homes built in the Midwest usually have a combination of continuous ridge and soffit vents. Attic Ventilation

  10. Baffle/ Air Vent/ Wind Tunnel Should be installed to a height of 12 to 18 inches above final insulation height and installed in every bay or cavity. Insulation Baffle

  11. Primary function is to control temperature Also can control/impact moisture, sound & fire/smoke Selection of Type and Form Depends on Climate Construction Cost Ease of installation Local market practices Attic insulation is generally loosefill and ventilation is critical Summary

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