New siding looks simple when the project is finished.
Old exterior disappears.
New exterior goes up.
Done.
But a proper siding replacement involves much more than attaching panels to the house.
CertainTeed emphasizes that vinyl siding needs a smooth, properly prepared substrate and a weather-resistant barrier because vinyl siding itself is not a watertight material.
That means the work happening behind the siding matters just as much as the colour homeowners see afterward.
Step 1: Exterior Assessment
Before installation, the contractor should evaluate:
- Existing siding
- Trim
- Wall condition
- Windows and doors
- Soffit/fascia
- Areas showing moisture damage
Envirotech’s own siding process begins with an on-site assessment and detailed quote.
Step 2: Existing Material Is Prepared or Removed
Depending on the project, old siding may need removal.
CertainTeed’s installation guidance describes stripping existing siding and levelling the underlying wall where necessary before new siding is installed.
Removing the old material also gives contractors a chance to see conditions that were previously hidden.
Step 3: The Wall Is Inspected
This is one of the most important parts.
Once old siding is gone, the crew may find:
- Damaged sheathing
- Moisture staining
- Installation problems
- Missing barriers
- Deteriorated trim
That information should affect the project.
Putting new siding over a known wall problem is not a proper repair.
Step 4: The Weather-Resistant Layer Is Addressed
Vinyl siding is not designed to function as the home’s only water barrier.
CertainTeed recommends installing a suitable weather-resistant barrier and properly flashing windows and doors before siding and trim.
This is the layer most homeowners never see after the project.
It is also one of the layers they should ask about.
Step 5: Trim and Accessories Are Installed
Before large wall sections are completed, installers need to handle details around:
- Corners
- Windows
- Doors
- Soffits
- Utility penetrations
These locations shape both appearance and weather performance.
Step 6: New Siding Is Installed
Vinyl siding must be installed correctly so the material can move naturally with temperature changes.
CertainTeed emphasizes correct fastening and substrate preparation as key to long-term siding performance.
Envirotech currently installs multiple systems including:
- Vinyl
- Insulated vinyl
- Specialty siding
- Aluminum
- Steel
Step 7: Cleanup and Final Inspection
Envirotech’s current process concludes with cleanup and final inspection.
Homeowners should review:
- Panel alignment
- Trim
- Corners
- Openings
- Property cleanup
- Remaining questions
What Should You Ask Before Installation?
Ask:
- Is the old siding being removed?
- What happens if damaged sheathing is found?
- What weather barrier will be used?
- How are windows and doors flashed?
- Is trim included?
- What materials are being installed?
- How are hidden repairs priced?
New Siding Is the Final Layer—not the Entire Project.
Planning an exterior renovation? Envirotech Exteriors can walk you through what happens behind the siding as well as what you will see when the project is finished.