Yes, vinyl car siding can be used for exterior applications on houses, but it is not the ideal or recommended product for that purpose. Vinyl car siding is specifically engineered for the interior of vehicles like vans and RVs, where it is protected from direct sunlight, extreme temperature swings, and physical impact. While it might seem like a cost-effective option, its performance and longevity outdoors are significantly inferior to siding products designed for residential use, such as vinyl lap siding or engineered wood siding.
The primary issue is weather resistance. Car siding is typically thinner and lacks the UV stabilizers and impact modifiers found in house siding. Prolonged exposure to the sun's ultraviolet rays will cause it to become brittle, fade in color, and crack much faster than rated siding. It is also not designed to handle the expansion and contraction that occurs with seasonal temperature changes, which can lead to warping, buckling, or pulling away from the wall.
For a direct comparison, here are key differences:
| Feature | Vinyl Car Siding | Residential Vinyl Siding |
|---|
| Thickness | 0.5 - 1.0 mm | 1.2 - 1.5 mm |
| UV Resistance | Low to Moderate | High (with stabilizers) |
| Impact Resistance | Low; cracks easily | Moderate to High |
| Warranty | Typically 1 year or less | 20+ years to lifetime |
| Wind Rating | Not rated | Often rated for high winds |
| Installation System | Simple adhesive or screws | Interlocking channel system |
If you are considering it for a small, protected area like a shed interior or a garage wall, it might suffice for a short period. However, for any primary structure, investing in proper siding is a wiser long-term decision. It will provide better insulation, durability, and importantly, protect the structural integrity of your home from moisture and wind damage.
