Are Lined Curtains the Same as Thermals?

Layering creates the thermal effect.

Thermal drapes use specialty linings, such as thermal foam-backed, blackout, flannel-backed or flannel interlining. The effect of the layers creates a thermal barrier that helps prevent heat loss through the window. Curtains, which by definition have no lining, can be thermal if the fabric has one of these specialty backings applied directly to it.

Thermal Foam-backed Lining

This is a base fabric that has a thick acrylic foam sprayed onto one side. This fabric is used as a lining and is applied directly to the wrong side of some drapery fabrics. The foam side faces the draperies.

Blackout Lining

This is a base fabric that has a very thin acrylic foam applied to one side. This foam is applied in two or three layers and creates a lining through which light will not pass. The smooth side faces the draperies.

Flannel-backed Lining

Typically, a cotton fabric is used for this lining, and the reverse side is combed, creating the effect of a flannel backing. The flannel backing faces the draperies.

Flannel Interlining

Cotton flannel or flannelet is used as a separate layer between the face fabric and another lining.

Combining Curtains

The thermal effect can also be created with several sets of curtains or drapes on one window on several rods. The main advantage of this system is that layers can be removed as the weather changes, and layers can be accessed for ease of cleaning.

References

• Thermal Insulated Curtains
• Interior Mall: All about drapery linings
• "Window Treatments"; Karla J. Nielson; 1990

Resources

• UniversityofWisconsinExtension: Energy Conserving Window Treatments (PDF)
• "Shades for Comfort";The Warm Company; 2000