Enjoy the glass in every season.
The appeal of steel is immediate: slender lines, generous glass, a garden that feels closer. You should be able to enjoy that room in August and January. Getting there takes a considered opening, from the glass to the threshold.
We build our standard exterior doors and windows with internally insulated steel profiles and triple-silver low-E insulated glass. It is a deliberate package: fine sightlines, generous daylight and solar-control glass, fabricated to suit your home. A true thermal break adds stronger frame insulation when the project calls for it. We work through the exposure, design and performance requirements with you so the investment serves the house beautifully.
Two frame approaches. A real difference.
Internally insulated steel has insulation inside the hollow metal profile. The steel remains continuous around that cavity. We fabricate these profiles into custom proportions, fine grids and distinctive shapes in our Dallas shop.
A thermally broken profile separates its inside and outside metal sections with an insulating connector. That interruption reduces heat traveling through the frame. It also helps keep the interior metal surface warmer during cold weather, improving resistance to condensation.
These are different construction methods. Ask to see the section through the frame: you should understand what you are buying without having to decode a sales pitch.
Internally insulated steel
Insulation fills the hollow profile. The surrounding steel remains continuous.
Thermally broken steel
An insulating barrier interrupts the metal connection between outside and inside.
Simplified frame concepts, shown to explain the difference in construction.
The largest part of the opening deserves serious glass.
In a minimal steel design, most of what you see is glass. That makes glazing one of the most consequential choices in the room. A beautiful frame deserves glass selected for the way the home faces the sun.
Our standard exterior approach uses triple-silver low-E insulated glass. The coating is designed to admit daylight while limiting unwanted solar heat and reducing radiant heat transfer. You get the openness that drew you to steel, with a glass package doing important work behind the view.
A frame’s thermal break and a glass coating solve different parts of the problem. Give both their proper place in the specification. Buying an upgraded frame while overlooking the glass leaves a major part of the opening unconsidered.
Explore our glass and material options How low-E glass controls heat and daylightSpend on the parts that change the room.
A door beneath a deep porch, a kitchen window shaded by mature trees, and a two-story west-facing glass wall are three different design decisions. Treating them as one repeated specification misses the opportunity to put the budget where it matters.
Here is how we approach the conversation:
- For a custom Dallas opening, start with our internally insulated steel and triple-silver low-E glass. It brings together the fine steel profiles, solar control and custom fabrication that draw people to D’Hierro. Match that package to the home’s performance targets before choosing upgrades.
- For demanding whole-home energy targets, colder locations or rooms with elevated humidity, bring thermally broken construction into the discussion early. Frame performance deserves particular attention here.
- For an interior partition between conditioned rooms, prioritize proportions, operation, privacy and glass. A thermal break generally brings little value to that application.
Know what the numbers are telling you.
U-factor describes heat flow: a lower value means better insulation. SHGC describes the proportion of solar heat admitted: lower values help control heat from the sun. Visible transmittance describes daylight: a higher value lets more visible light through.
Read them together. Chasing the lowest solar heat gain without looking at daylight or appearance can give you a room that feels darker than you intended. We want glass that protects the comfort of the room and preserves the reason you opened the wall.
Also ask what the number describes. A glass-only value and a whole-window rating are different measurements. When your architect specifies a whole-product target, use the rating for the proposed frame-and-glass assembly.
- U-factor
- How readily does heat pass through?
Lower means less heat transfer. Compare the rating for the complete door or window.
- SHGC
- How much solar heat gets inside?
A lower solar heat gain coefficient helps control heat from the sun.
- Visible light
- How bright will the room feel?
Visible transmittance describes how much visible light passes through the glazing.
- Air leakage
- How well does the opening seal?
Operation, weather seals and installation all play a part in a comfortable room.
Design for the sun your house actually gets.
Look at the opening when you use the room. Where does afternoon light hit the dining table? Does the covered terrace shade the door? Is the best view also the most exposed elevation? Those answers belong in the design conversation.
Send us photographs, elevations and the direction each opening faces. Include the overhangs, trees and nearby walls. We can discuss the glass, frame and design together, while your architect coordinates the home’s overall performance targets. Good decisions get easier when everyone is looking at the same house.
Bring the whole opening together.
A door has to close cleanly, seal consistently and meet the surrounding construction properly. The glazing edges, weatherstripping, threshold and installation deserve the same attention as the profile. These details turn a handsome drawing into something you enjoy using every day.
Our team designs, fabricates and installs the steelwork. Bring us your opening and your priorities. We will work through the sightlines, glass, operation and frame approach with you—then build the door around the decisions that matter.
Inside our Dallas fabrication processCommon questions.
Is an insulated steel door the same as a thermally broken door?
No. Internal insulation fills the hollow steel profile; a thermal break interrupts the metal connection between the inside and outside sections. Ask for a frame section so you can see the construction you are comparing.
Do I need thermally broken steel doors in Dallas?
For a custom Dallas opening, start with our internally insulated steel and triple-silver low-E glass. Choose a thermal break when the project calls for stronger frame insulation, tighter whole-product targets or greater condensation resistance. We’ll work through that choice with you and your architect.
Does low-E glass help during winter as well as summer?
Yes. Low-E coatings reduce radiant heat transfer, helping retain indoor heat in winter. Solar-control versions also limit unwanted heat from the sun. That combination makes the glass selection important throughout the year.
Does a thermal break mean thicker-looking frames?
It does not have to. Modern thermally broken steel systems offer narrow sightlines. Compare drawings of the actual profiles and the finished opening; the system and configuration determine what you see.
Will a thermally broken frame eliminate condensation?
It improves resistance by keeping the interior metal warmer in cold conditions. Indoor humidity and outdoor temperature still matter. If the room has a pool, spa or other major moisture source, make that part of the brief from the beginning.
What should I send to discuss the right glass and frame?
Send opening photos or elevations, approximate sizes, the property location, which direction the openings face, and any performance requirements from your architect. Tell us what you want the room to feel like. We’ll help turn that into a clear design conversation.
