Reattach loose vinyl siding
A piece of vinyl siding that's flapping or has come unhooked can usually be snapped back into place with a siding zip tool, and renailed if the nails pulled out. The detail that matters is that vinyl siding is nailed loosely, in the center of the slots, so it can expand and contract. Nailing it tight is what makes it buckle. A siding zip tool costs about as much as a sandwich, and it's the difference between an easy job and a cracked panel.
How vinyl siding hangs
Each row of vinyl siding hooks onto the row below it and is nailed through slots along its top edge, and the row above covers those nails. A zip tool unhooks a row so you can get to the one underneath.
Vinyl moves a lot with temperature. The nails go in the middle of the slots and are left with a small gap under the head, about the thickness of a dime, so the siding can slide as it expands.
Why siding comes loose
Strong gusts can unhook rows.
The siding can't move, so it buckles or pops off.
Nails that don't reach solid wood don't hold.
Impacts, a grill too close, or old, brittle vinyl.
| What you see | Likely cause | Fix |
|---|---|---|
| A piece flapping or unhooked | Wind | Zip it back on. |
| Waves or buckles | Nailed too tight | Loosen and renail in the slot centers. |
| A crack or hole | Impact or age | Replace the piece. |
| Melted or warped | Heat from a grill or reflected sun | Replace it; move the heat source. |
Snap the siding back in, step by step
- Find the unhooked edgeLook for where the bottom lip of the loose piece has come off the row below. Check for missing or pulled nails along its top edge.
- Unzip the row aboveHook the zip tool under the bottom edge of the row above the loose piece, pull down and out, and slide it along to unhook that row so you can reach the nailing strip.
- Hook it backPush the loose piece's bottom lip up onto the row below until it snaps in, working along its length.
- Renail if neededWith the piece locked onto the row below, drive new corrosion-resistant nails through the center of the slots into or solid sheathing, about 16 inches apart with at least 3/4 inch of nail in wood. Leave a small gap under each head so the siding can slide.
- Zip the row above back onHook the zip tool into the upper row's lip and slide it along while pressing the siding in, so the row locks onto the one below.
Watch it done
- The loose piece is snapped onto the row below along its whole length
- The row above is zipped back on and locked
- The siding lies flat with no waves or buckles
Waving or buckling? The nails are too tight; back them out slightly.
If it buckles or won't stay on
If the siding waves or buckles, the nails are too tight. Unzip the row above, back the nails out slightly or move them to the centers of the slots, and refasten.
If a piece is cracked, replace it: unzip the rows, pull the nails, slide in a new piece and nail it the same way. Take a piece to a siding supplier to match the profile and color.
What a pro typically charges (a rough estimate; prices vary by area): A siding contractor typically charges $150–$400 to reattach or replace a few pieces.
Find a siding contractor near you