Contractors selling steel siding in Iowa and Illinois will eventually hear some version of this question:

"If steel gets freezing cold outside, won't it make my house colder?"

It is a reasonable question.

Touch a steel panel outside on a January morning in Davenport, Bettendorf, Moline or Rock Island and it may feel extremely cold.

But touching the siding tells you the temperature of the exterior surface. It does not tell you the temperature of the interior drywall or the amount of heat escaping from the house.

Between that steel panel and the homeowner's living room is an entire wall assembly. Understanding that distinction is the key to answering this question correctly.

The Short Answer

Start With the Most Important Concept: Heat Moves From Warm to Cold

During winter, the important issue is not whether the siding feels cold.

The important issue is how readily heat from inside the home can move through the building enclosure toward the colder outdoors.

The U.S. Department of Energy's insulation guidance explains that insulation works by resisting heat flow. During winter, properly installed insulation reduces the rate at which heat moves from the heated interior toward colder exterior conditions.

"In winter, we're not trying to keep the siding warm. We're trying to slow the movement of heat from your living space through the wall."

That is a much easier concept for a homeowner to understand.

Steel Siding Is Not the Insulation

This is where contractors need to be precise.

Standard steel siding is exterior cladding. It should not be presented as though the steel panel itself provides the primary thermal resistance of the wall.

A typical exterior wall may contain several layers:

The U.S. Department of Energy Building Science Education program explains how continuous exterior insulation can reduce heat loss through framing and improve the thermal performance of exterior walls.

That is why the contractor should discuss the entire wall rather than the steel panel alone.

But Steel Conducts Heat. Isn't That Bad?

Steel is a highly conductive material compared with insulation.

That fact is true.

The mistake is jumping from that fact to this conclusion:

"Steel conducts heat, therefore a steel-sided house must be colder."

That ignores the rest of the wall.

The steel siding is not normally a continuous sheet running from the outside surface directly into the living room. It is exterior cladding installed over other components of the building enclosure.

"Yes, steel conducts heat. But the siding is only the outside layer. The insulation and air-control system behind it are what we need to evaluate when we're talking about winter comfort."

What Actually Makes a House Feel Cold?

If a homeowner complains about a cold house, there are several possible causes that deserve more attention than the siding material alone.

Air Leakage Can Make a Bigger Difference Than Homeowners Expect

A homeowner may say:

"This wall always feels cold in the winter."

The issue may not simply be conductive heat loss.

There may also be uncontrolled air movement.

The DOE Building Science Education guidance on exterior-wall air barriers explains the importance of controlling air leakage through the building enclosure.

Air can leak around:

• Windows
• Doors
• Electrical penetrations
• Plumbing penetrations
• Rim joists
• Wall-to-foundation connections
• Wall-to-attic connections
• Other gaps in the building envelope

That question can completely change the conversation.

Thermal Bridging Matters in Winter

A framed wall is not thermally uniform.

Insulation may fill the cavities between studs, but the framing itself can provide a more conductive path through the wall.

This is one reason continuous insulation can be valuable.

DOE's guidance on wall framing and insulated sheathing discusses using continuous exterior insulation to reduce thermal bridging through framing.

"Insulation between the studs is important, but the studs themselves can still conduct heat. Continuous exterior insulation can help reduce those thermal bridges when the wall is designed for it."

Re-Siding Can Create an Opportunity to Look at the Wall

One of the advantages of an exterior remodeling project is access.

Once the existing siding is removed, contractors may discover conditions that have been hidden for decades.

Do not promise the homeowner that every siding project provides access to correct every insulation issue. Wall assemblies vary, and cavity insulation is not necessarily accessible from the exterior without additional work.

But re-siding is an appropriate time to think about the building envelope rather than treating the project as nothing more than replacing one exterior surface with another.

Can Insulation Be Added Behind Steel Siding?

Depending on the specific construction, siding system, code requirements and manufacturer's installation instructions, continuous exterior insulation may be incorporated into a siding project.

The DOE Building Science Education resource on continuous rigid insulation and siding explains how exterior insulation can help reduce heat transfer through framed walls.

Contractors need to verify:

• Insulation thickness
• Required fastener length and spacing
• Structural fastening requirements
• Window and door projection
• Flashing details
• Drainage requirements
• Trim compatibility
• Manufacturer installation requirements
• Applicable building codes

What About Gentek SteelTek Supreme?

Gentek's SteelTek Supreme Steel Siding is a premium steel exterior cladding system featuring Galvalume AZ-50 steel and Kynar PVDF coating technology.

Gentek emphasizes characteristics such as:

• Durability
• Dimensional stability
• Low-maintenance performance
• Color and appearance
• Multiple siding profiles
• Premium exterior performance

Those are legitimate product discussions.

But contractors should not turn dimensional stability into an insulation claim.

"SteelTek Supreme is designed to be a durable exterior cladding. When we're talking about keeping the house warm, we need to look at the insulation and complete wall assembly behind that cladding."

Does Steel Siding Have an R-Value?

Contractors need to be careful with this question.

Do not assign an insulation R-value to standard steel siding unless the manufacturer provides documented thermal-performance information for the exact product or tested assembly being discussed.

The steel panel itself should not be sold as though it performs the job of wall insulation.

"The steel is your exterior cladding. If you want to talk about R-value, let's talk about the insulation package and the complete wall assembly."

That keeps the sales presentation accurate.

What About a 50-Year-Old Quad Cities Home?

This is where the conversation becomes especially valuable.

Many homes throughout Davenport, Bettendorf, Moline, Rock Island, East Moline and surrounding communities were built under different energy standards and construction practices than today's homes.

If the homeowner already complains about:

• Cold exterior walls
• Drafty rooms
• Cold floors
• Condensation around windows
• High heating bills
• Rooms that are difficult to keep warm

do not simply say:

"New siding will fix that."

Instead say:

"Since we're already working on the exterior, let's look at the conditions we can evaluate during the project and see whether there are building-envelope improvements that make sense."

That is a professional answer and protects the contractor from promising results the siding alone cannot deliver.

Cold Walls and Drafts Are Not the Same Thing

This distinction is worth teaching at the kitchen table.

Why Windows Matter to the Conversation

A homeowner may blame a cold room on the siding when the larger comfort issue is coming from windows or air leakage around openings.

DOE's Energy Saver guidance on energy-efficient windows explains how windows influence heat loss, heat gain and overall energy performance.

During a siding estimate, ask:

"When you're sitting near the window, do you actually feel moving cold air, or does the glass itself just feel cold?"

Again, diagnose before promising a solution.

Five Questions to Ask a Homeowner Who Says the House Is Cold

A Kitchen-Table Demonstration That Makes Sense

Instead of giving a five-minute lecture about thermal conductivity, physically show the homeowner the layers.

Then explain:

"This steel panel might be 10 degrees outside. But your living room isn't directly touching this panel. These layers between the siding and the interior are what we evaluate when we're talking about keeping your home warm."

The homeowner can now visualize the answer.

What If the Homeowner Says a Metal Building Is Freezing in Winter?

This comparison comes up frequently.

A pole building, detached garage or storage shed may have metal cladding with little or no insulation and substantially different air-control details.

That is not the same enclosure as an insulated conditioned home.

"The metal may be similar, but what is behind the metal can be completely different. A minimally insulated shed and a properly insulated house are not comparable wall assemblies."

Compare wall systems—not simply cladding materials.

What About Iowa and Illinois Winter Weather?

This question matters in the Quad Cities because exterior systems need to perform through substantial seasonal temperature changes.

Contractors working throughout Davenport, Bettendorf, Eldridge, Le Claire, Moline, Rock Island, East Moline and surrounding Eastern Iowa and Western Illinois communities need to think beyond appearance.

A complete exterior project should consider:

That is why installation quality and the layers behind the siding matter as much as choosing an attractive exterior product.

Do Not Promise Lower Heating Bills Just Because the Customer Chooses Steel

This is an important sales boundary.

The 30-Second Kitchen-Table Answer

The One-Sentence Answer

Turn the Question Into a Better Sales Conversation

A salesperson should not hear:

"Will steel make my house colder?"

and immediately start defending steel.

Instead, recognize what the homeowner is really telling you:

That opens the door to better discovery questions:

• Which rooms are currently cold?
• Are there drafts?
• How old are the windows?
• What insulation does the house currently have?
• Has the attic been insulated or air sealed?
• Are heating bills unusually high?
• Should exterior insulation be evaluated during the siding project?

Now the contractor is no longer arguing about whether metal feels cold. The contractor is helping the homeowner understand the house.

Learn More About Steel Siding at Suburban Wholesale & Supply

Contractors do not need exaggerated energy claims to build value in a steel siding presentation.

Accurate product knowledge is more powerful.

Suburban Wholesale & Supply works with professional contractors throughout Davenport, Bettendorf, Moline, Rock Island, East Moline, the Quad Cities, Eastern Iowa and Western Illinois.

Visit Suburban Wholesale & Supply to compare Gentek steel siding samples, colors, profiles, accessories and product literature, or explore our siding products and contractor resources online.

Our team can help contractors compare siding systems, review available components and build material packages appropriate for the project.

The goal is simple: understand what the product does, understand what the wall assembly does, and explain both accurately to the homeowner.

Sources & Contractor Resources