Short Answer
Siding installation matters because even high-quality siding will fail if it is installed incorrectly. Common installation problems — improper fastening, insufficient expansion gaps, missing or improperly installed house wrap, incorrect flashing around windows and doors, and sealing joints incorrectly — can cause warping, water intrusion, and premature failure. The manufacturer warranty may be voided by improper installation.
Detailed Explanation
Siding is part of a wall assembly that includes the siding itself, the weather-resistive barrier (house wrap), flashing at all penetrations and openings, and the substrate beneath. Each component must be installed correctly for the system to manage water and perform as designed. Common installation mistakes include: fastening siding too tightly to the wall, which prevents the siding from expanding and contracting with temperature changes and causes buckling; not providing proper expansion gaps at joints and corners; installing house wrap with reverse laps that trap water rather than shedding it; missing or improperly installed flashing around windows, doors, and other penetrations; nailing in the wrong location on the siding panel (the nailing slot is designed to allow movement); and not properly integrating the siding with the flashing and house wrap at transitions. These installation errors can cause warping, water intrusion behind the siding, rot in the sheathing and framing, and premature siding failure. A manufacturer-certified contractor — like a CertainTeed SidingMaster PREMIER contractor — has been trained in the manufacturer's specific installation methods, which helps ensure the installation meets the requirements for warranty coverage and long-term performance.
Why It Matters
The best siding material poorly installed will fail. Quality materials properly installed will perform for decades. Installation quality is the single biggest factor in siding performance.
Common Mistakes
- ✕Fastening siding too tightly, preventing expansion and contraction
- ✕Missing or improperly installed house wrap
- ✕Incorrect flashing around windows and doors
- ✕Nailing in the wrong location on the siding panel
Questions to Ask Your Contractor
- ?What installation training do your crews receive?
- ?Are you certified by the siding manufacturer?
- ?How do you ensure proper flashing and house wrap integration?
- ?How do you handle expansion gaps?