Sheer vs Blockout vs Double Curtains: Choosing the Right Setup

Double curtains
Double curtains are simply sheer + blockout, installed as a two-layer system (either on a double track or separate tracks). They solve the core problem people hit after buying just one type: the room needs different behaviour during the day versus at night.

Double curtains are also supported by building-science logic: multiple layers of fabric and snug fit increase insulation because they reduce heat flow between room air and the air next to the window, especially when air movement is minimised. 

Room-by-room recommendations

• Living room: sheers alone can be enough if privacy is only a daytime concern. Add blockout if the room faces the street or gets strong west sun late afternoon.
• Master bedroom: double curtains are the “set and forget” choice.
• Kids’ rooms: blockout (often paired with a simple sheer if you want softness).
• Home office: depends on glare; sometimes a blind is better for tight control, with a sheer added for aesthetics.

Thermal and comfort: what actually changes
Windows are a major heat pathway. Australian sources commonly note up to 87% heat gain in summer and 40% heat loss in winter can happen through windows.

Curtains help most when:

• they’re close-fitting
• they’re lined
• the top is sealed with a pelmet (or a well-designed ceiling/track detail)

Energy.gov.au and YourHome both call out pelmets/fitted tops as a practical way to reduce heat loss and improve performance. 

Curtain headings and tracks: the part most people under-spec
The heading choice affects how the curtain stacks, how it drapes and how much light leaks at the top edge.

• S-fold / wave: clean, modern, consistent folds.
• Pinch pleat: more fullness; suits classic homes and formal rooms.
• Pencil pleat: flexible, but often looks less tailored unless done carefully.

Track choice matters too:

• Ceiling-mounted tracks reduce light gaps and look more architectural.
• Wall-mounted tracks can work well with a pelmet or when ceiling mounting isn’t possible.

Common buying mistakes

• Choosing sheers because they look good in daylight, then realising they don’t solve night privacy.
• Choosing blockout only, then finding the room feels flat and heavy in daytime.
• Not allowing enough stack-back space, so windows look smaller when curtains are open.
• Underestimating pelmets: they’re a performance feature, not a decoration.

Disclaimer: Please note, information contained in this page is general information only. Installation must follow manufacturer instructions and comply with Australian product safety requirements.