How to Repair Falling Siding
Vinyl siding is an interlocking system of channels and panels. Each siding panel fits into a J-channel, and the lower edge of one panel locks onto the top edge of the panel beneath it. Each panel should be nailed to the structure. Falling siding is an indication of improper installation. First check whether or not your siding is still under warranty. If it is, contact the installers and have them fix it. If the siding is no longer under warranty, you have to unlock the siding and nail each piece to the structure.
- Unlock the falling vinyl siding panels using the vinyl siding unblocking tool. Vinyl siding panels interconnect with one another. The vinyl siding unlocking tool is slid between the interconnected seams between panels and used to pull them apart.
- Use the level to position the panels and nail them in place with corrosion-resistant nails. Work from the bottom up. Nail the upper edge of each panel to the wall through the existing nail slots. Drive the nails at a distance of no greater than 16 inches apart. Position the nails in the center of the nail slots. Vinyl expands a great deal in heat. When nailing any vinyl pieces, leave 1/32 to 1/16 inch of the nail shafts exposed. Nailing the siding down tight will prevent it from moving in heat, and could cause buckling and warping.
- Snap the lower edge of each panel to the upper edge of the panel beneath and continue nailing each panel in place. Check the level of your panels every fourth course, or row, and adjust accordingly.
- When you get to the windows, and if the siding is not firmly secured, use the snap lock tool to punch lugs into the edge of the siding. These lugs will snap into the under-sill trim and hold the siding in place. Punch the lugs a distance of no greater than 16 inches apart. Snap the siding into place underneath the windows.
- At horizontal eaves, if the siding is falling out, use the snap lock tool to punch lugs into the upper edge of the panels. Lock these panels into place under the horizontal eaves.