Your walls account for 25-35% of your home's heat loss. The right siding system can cut energy costs by 10-20%. Here is the science and the practical advice.
Siding itself has minimal R-value, but the installation system (housewrap, insulated sheathing, air sealing) dramatically impacts energy efficiency. Insulated vinyl adds R-2 to R-5; adding rigid foam sheathing before siding installation adds R-5 to R-10. Combined with proper air sealing during siding replacement, homeowners typically see 10-20% reduction in heating and cooling costs.
Thermal bridging occurs where your wall studs (wood framing) create direct paths for heat transfer between your conditioned interior and the cold exterior. Even with insulated wall cavities, studs cover 15-25% of your wall area and conduct heat 3-4x faster than insulation.
During siding replacement, we have the opportunity to add a continuous insulation layer over the entire exterior — including over the studs. This eliminates thermal bridging and is the single most effective energy upgrade you can make to an existing home's walls.
| Insulation Method | R-Value Added | Cost/sq ft | Energy Savings |
|---|---|---|---|
| Insulated vinyl siding | R-2 to R-5 | $1-2 extra | 5-10% |
| 1" Rigid foam sheathing | R-5 | $2-3 extra | 10-15% |
| 2" Rigid foam sheathing | R-10 | $3-5 extra | 15-20% |
In Wisconsin, yes. The payback period for insulated siding or added rigid foam is typically 5-8 years in energy savings alone. After that, you're saving $200-$500+ per year indefinitely. Plus, insulated siding is more rigid, quieter, and more impact-resistant.
Insulated siding and insulated sheathing may qualify for the federal energy efficiency tax credit (25C) of up to $1,200 per year. The insulation component must meet specific R-value requirements. Consult your tax advisor for current eligibility.
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