vi Contents
Why Not Design the Devices so That They
Can Be Kept on the Windows During the
Daytime Also? 44
Why R-Values of Shutters and Shades Are
Seldom Mentioned in This Book 44
Proper Measure of Thermal Performance of a
Shutter or Shade 45
5 MAIN INSULATING MATERIALS 46
Thermax 47
Polystyrene Foam 47
Urethane Foam 47
Thermoply 47
Fiberglass 48
Foamglas 48
Wood 48
Aluminum Foil 48
Other Opaque Flexible Sheets 49
6 OUTDOOR TRANSP ARENT AND
TRANSLUCENT INSULATING DEVICES 51
Manufacturers of Glass Sheets 51
Manufacturers of Replacement -Type Windows
Double-Glazed with Glass 53
Manufacturers of Rigid and Semi-Rigid
Plastic Sheets 53
Manufacturers of Flexible Plastic Sheets 53
Manufacturers of Bubble-Plastic and
Honeycomb-Plastic Sheets 54
Manufacturers of Dual-Wall Translucent
Plastic Sheets 54
Means of Attaching a Rigid Sheet 55
Means of Attaching a Flexible Sheet 56
Which Attachment Location Is Best? 57
How to Prevent a Large Outdoor Sheet of Flexible
Plastic From Flapping and Bellying 58
Outdoor Set of Two or More Sheets of
Translucent Glazing 58
7 OUTDOOR OP AQUE SHUTTERS THA T
ARE NOT PERMANENTL Y ATTACHED 59
Main Design Features 60
Outdoor Single Plate Held by Buttons 61
8 OUTDOOR OP AQUE SHUTTERS
ATTACHED BY HINGES 63
Outdoor'Single-Plate Attached by Hinges
at One Side 65
Outdoor Shutter Employing Two Plates
Hinged at the Sides 65