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Are capsule house windows double or triple glazed?
Do you love the sleek look of capsule houses with their big panoramic windows? Many of these houses use advanced glazed windows instead of the single pane glass found in older houses. These capsules basically use IGUs (insulated glass units) with two or three panes of glass.
Double pane windows have two glass layers.
Triple pane windows have three glass layers.
Each IGUs has a Low-E (Low Emissivity) coating and is filled with a sealed gas cavity.
Your windows do more than frame the view. They protect your house from heat, from cold, from noise and even from intruders. How well they handle all this mostly depends on how many glass layers they have.
In this article, you’ll learn whether double or triple pane windows work better for capsule houses and which one is right for your needs.
1) Double glazed vs triple glazed for capsule houses
You may know, capsule houses usually use insulated glass units (IGUs). And an IGU simply means multiple panes sealed together. You’ll normally see two pane (double) or three pane (triple) IGUs. Each pane is always toughened (tempered) for safety. Between the panes is an airtight spacer filled with a gas like “argon, krypton” to slow down heat transfer.
A Low-E coating on one glass surface basically “reflects infrared heat back inside in winter plus keeps out heat in summer”. For example, a common double glazed IGU can be “6-12-6”: two 6mm glass panes separated by a 12mm argon gap. But a triple glazed unit adds another layer: e.g. “6-12-6-12-6” has three 6mm panes and two 12mm gaps. And also triple glazing may use “krypton” gas or extra coatings.
You should know the extra pane gives better sound and thermal insulation, which high end capsules mostly have. Therefore, in capsule models it is common to see double IGUs (two panes) or triple IGUs (three panes) with Low-E coatings in all cases.
2) Best glazing by climate and use
Your climate makes a big impact in choosing window glazing. In mild or temperate zones, double glazed units mostly suffice. As a high solar-gain Low-E double pane with an argon fill lets winter sun in but minus heat loss. This works perfect if your capsule has big south/sun-facing windows, so winter sun can warm the space.
In cold, snowy or very windy sites, triple glazing keeps you safer. Because triple pane windows hold heat better, reducing cold spots and condensation on the glass plus improves comfort”. All of these benefits because triple units have lower U-values (better insulation) than doubles.
However, that extra pane adds weight and cost. So, your hardware and frames must need to handle it. Thus, in moderate climates you might skip triple glazing to save money.
In short: go for double glazed Low-E if you live in a milder region or mostly sunlit spots… as it balances cost and comfort. And go for triple glazed Low-E if you face severe winters or want top performance… but be ready for the extra weight and price.
3) Low E coatings, gas fills and spacers
Low-E coatings, the noble gases, and spacer bars are the trump cards of IGUs.
➜ The “type of Low E-coating” determines your window’s U-factor and solar heat gain coefficient (SHGC). A high-SHGC Low-E coating (sometimes called high solar gain) is best for cold climates or passive solar. A low-SHGC coating (sometimes called low solar gain) is perfect for hot climates. Thus, be sure to choose the coating according to your climate and window orientation.
➜ Gas like “argon gas” is the default fill between panes. It cuts heat transfer compared to air… while being relatively cheap. Argon performs very well in usually ~12–16mm gaps. But when gaps are narrower or you need extreme insulation, krypton gas is the go-to option. Because krypton is denser and insulates better in tight spaces.
➜ The spacer bar separating panes also matters a lot. Avoid ordinary metal spacers, which conduct heat. Instead use a “warm-edge” spacer. Because warm-edge spacers are made of “low conductivity materials and raise the temperature at the glass edge”. This means the inner glass edge stays a few degrees warmer in winter by cutting condensation at the seal line.
So when you order capsule windows, ask for warm-edge (thermally improved) spacers to improve comfort and avoid dew.
4) Frames, hardware and thermal breaks for curved shells
The frame material is as important as the glass. Many capsule shells are steel, aluminum or fiberglass. And you know metal frames conduct heat… unless they have thermal breaks aluminum.
You should specify frames with built-in thermal barriers… if the capsule exterior is metal or FRP. uPVC or fiberglass frames are also good options because they hardly conduct heat.
Remember that triple glazed models are heavier. So, size your hardware accordingly. Then use hinges, rollers and fasteners rated for the extra weight.
“We advise checking with the supplier to ensure your chosen frames and fittings can handle triple IGUs”.
For curved or specially shaped capsules, sealants and setting blocks must flex. Note that standard gaskets or blocks may not bend… and these can cloud or delaminate bent glass. Therefore, use high-flex silicone or approved materials.
5) Large panoramic windows and curved glass options
As you know, capsule houses mostly boast big windows or even skylights… so safety is key.
➜ For impact zones (like near entries or roof windows) use safety glass. Laminated glass is usually considered safe for skylights or overhead glazing. As it holds together when broken, so shards stay stuck and don’t fall inside. And tempered glass is stronger and resists heat… but it shatters into small blunt pieces upon breakage.
Both tempered and laminated are used but building codes may require laminated in some areas. Thus always confirm that any large window or skylight meets the local safety rating.
➜ Curved insulating glass models are possible but need care. Some capsule designs use curved double glazed IGUs. But fabricators mostly use flexible silicone spacers to make bent IGUs. These flexible spacers bend with the glass and reduce stress on the seal. In some cases, even triple pane curved models are made but usually with a gentle radius. Thus always check with engineers if your design calls for triple curved glass; as each radius is a case by case test.
➜ Moreover, plan for snow and rain. Keep main entrances and sliding doors clear of heavy snow load from above. For this, you need to add primary snow diverters or guards over large windows. This prevents roof snow from piling on the glass. Plus, this makes sure that heavy snow will slide off the roof or be caught by diverters, not press against your sliders.
6) Condensation, noise and comfort
Your comfort mostly comes down to a few key numbers.
First, target a low U-factor (high insulation) specially on cold-side facades.
Second, pick SHGC by facade: allow more solar gain on sunny walls, less on shaded ones. Many manufacturers provide full NFRC ratings (U-value, SHGC, VLT).
Third, look at Condensation Resistance ratings. An “NFRC Condensation Resistance (CR) rating above 50 is generally recommended”. So, high CR means the glass and frame stay warmer… thus you avoid fogging on cold days.
Lastly, noise also matters in a capsule’s small space. So, for dampen sound, consider laminated acoustic glass or special acoustic interlayers. Because laminated glass has a PVB/acoustic interlayer that “decouples panes and absorbs vibration”. You can also mix pane thicknesses (like one thick pane and one thin pane) to reduce specific frequencies.
Thus, by handling U-factor, SHGC and condensation resistance per facade plus using noise damping glass where needed, you’ll keep your capsule comfortable year-round.
FAQs
Are capsule house windows usually double or triple glazed?
Capsule models basically offer both options. But mostly standard capsules come with double glazed insulated glass. High end or cold-climate versions may use triple panes to boost efficiency.
Is triple glazing worth it in a mild climate?
Usually not necessary. In mild or temperate climates, double panes with a suitable low-E are mostly sufficient. In fact, triple glazing is mostly beneficial in very cold areas or where extra insulation is needed.
Can curved glass be triple glazed on a capsule house?
It can be but there are limits. Curved double glazed models are common and can be made with flexible spacers. Triple glazed curved units exist too, but only if the curvature is gentle enough. In short,curved triple glazing is possible… but it depends on the bend radius and your supplier’s capabilities.
Conclusion
You now know that capsule houses use advanced window systems. They may have double pane or triple pane glazed windows. You can use double glazing windows for good insulation in moderate climates and passive solar gains.
You can choose triple glazing windows for extra insulation in cold, windy areas. Plus select the Low-E coating by your climate and always fill the panes with gas. Go for safety glass for large windows/skylights and use laminated/acoustic glass for noise.
At this point you understand the glazing options you can choose for your capsule house. Whether you want a double or triple pane capsule house, Glamni can provide one for your needs.
