Windows & Doors in Arleta with Tempered, Low-E Glass
Tempered, low-E dual-pane windows in metal frames with metal screens, specified for Arleta homes by Fernhill Builders for heat, sun and embers.
Tempered glass with a low-emissivity coating handles two separate threats in an Arleta window. Tempering lets the pane take uneven heating without cracking, which counts when a fire nearby throws radiant heat at it. The coating, a microscopic metal layer sealed inside the unit, turns back part of the infrared from hard sun on an inland lot. Built into one dual-pane unit, the pair resists breakage and keeps rooms cooler.
How tempering and the coating are made
Tempering happens at the factory. A cut sheet is heated close to its softening point and then cooled fast with jets of air, which locks the surfaces in compression and the core in tension. That is why tempered glass tolerates uneven heating far better than annealed glass, and why it breaks into small cubes. The low-E layer goes on an inner face of the sealed unit, where it cannot be scratched. Tempered glass cannot be cut afterward, so every unit is ordered to the measured size of its opening.
Frames and screens around the glass
A frame that softens in heat can let a good pane drop out of its seat. For that reason we lean toward thermally broken aluminum, or wood clad in aluminum on the outside, on walls that face brush, a wood fence or a close neighbor. Some vinyl products carry listings for fire areas, and we check that listing before using one. Screens get metal mesh, aluminum or stainless, since plastic mesh melts and leaves the glass open to embers at the moment it matters.
Windows & Doors in Arleta: common questions
The low-E coat earns no credit under the wildfire standard, so the tempered layer carries that job. If the fire hazard map covers the Arleta parcel, each window has to pair a tempered layer with at least one more pane, or be block glass, or carry its own fire rating or listing. The coat still pays its way against heat and helps meet the energy rules.
An aluminum frame that is still straight can often take an insert, since the new unit seats cleanly inside it. Warped vinyl, a wood frame with soft spots or one that was set without flashing goes full-frame, so the weak material leaves and the Arleta opening gets a new sill pan and lapped flashing.
Begin with single-pane glass, largest first, because one annealed sheet is the quickest to crack and fall out in heat. A garage door with gaps along its sides or bottom belongs in that opening round, and so does an entry door that lets light through. Dual-pane units without a tempered layer come next.
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