Hanging C9 Lights on the Roofline
Most of an install happens on the ground. By the time you climb, every run is cut, plugged, tested, bulbed and clipped. What is left is safe ladder work, a sensible hanging order and keeping every bulb straight.
- Maintain three points of contact: two feet and one hand, or two hands and one foot.
- Use the 4 to 1 angle rule: one foot out at the base for every four feet of height.
- Extend the ladder 3 feet above the roof edge if you will step onto the roof.
- Set the feet on firm, level footing. Never on ice, a slope or loose material.
- Use a stand-off so the ladder rests on the wall and not on the gutter.
- Keep your belt buckle between the rails. Move the ladder instead of reaching.
- Do not work on a roof in rain, frost, snow or wind.
Hanging order
Prep every run on the ground
Each run should already be cut, plugged, tested, fitted with bulbs, and clipped with the right clip for its surface. Coil it with the male plug on the outside and a tag with its run number.
Set the ladder correctly
Put the feet on firm, level ground. Set the angle so the base is one foot out from the wall for every four feet of height to the top support point. If you are stepping onto a roof, the ladder must extend 3 feet above the roof edge. Use a stand-off stabilizer so the ladder rests on the wall, not on the gutter.
Start at the power end
Begin each chain at the run closest to its outlet. Run the jumper from the outlet to the start of the run first and clip it along trim so it stays out of sight.
Clip the run in place
Work from the power end outward. Hook or slide each clip into position, moving the ladder rather than reaching. Keep three points of contact on the ladder at all times.
Straighten the bulbs as you go
Look back along the run every few feet and square each bulb so they all point the same direction. It is much harder to fix alignment after the whole house is up.
Connect runs in sequence
Plug the male end of each next run or jumper into the female end of the last. Keep each connection up off gutters where water pools.
Handle peaks and valleys
At a peak, end one run exactly at the peak and start the next so both sides meet cleanly. At a valley where two roof sections meet, bridge with a jumper rather than bending socket wire through it.
Power up and inspect from the street
Plug in at dusk and look from where visitors will stand. Replace any dark bulb, straighten any crooked one, and fix sagging spots with an extra clip.
Keeping the line straight
The difference between an average roofline and a sharp one is alignment. Three habits keep it straight:
- One clip per socket. Every socket held at the same point means the wire cannot sag between them.
- Same orientation on every clip. Decide whether bulbs point straight up or angle out, and set every clip the same way before the run leaves the ground.
- Check as you go. Sight down the run from the ladder every few feet. A bulb that is off now is a trip back up the ladder later.
Peaks: meeting in the middle
The peak of a gable is where a roofline shows workmanship. Plan the run map so one run ends exactly at the peak and the next begins there. Measured this way, the two top bulbs sit next to each other at the apex. If sockets land short of the peak, the choice is to accept a gap or move the start point so the spacing works out. That is decided on the ground with a tape, not on the roof.
Valleys, dormers and chimneys
Where two roof planes meet in a valley, or the edge is interrupted by a dormer or chimney, do not force socket wire through the obstacle. End the run, bridge the gap with an SPT-1 jumper made from Lamp Cord, and start the next run on the other side. The jumper can be tucked along trim so it disappears at night.
Ground runs to finish the display
A roofline often continues down to walkways or garden beds. Use 8 inch light stakes at every socket for ground runs, keeping connections raised off wet ground.
Questions installers ask
Should I hang C9 lights on the gutter or the shingles?
On eaves with gutters, the gutter lip is easiest and gives a straight line. Where there is no gutter, clip to the shingle edge with shingle tabs.
How far should a ladder extend above the roof?
If you are stepping from the ladder onto the roof, the ladder should extend 3 feet above the roof edge so there is something to hold while stepping off and back on.
What is the 4 to 1 ladder rule?
For every 4 feet of height to where the ladder rests, the base goes 1 foot out from the wall. It gives a stable angle of about 75 degrees.
How do I keep bulbs lined up?
Use O clips so sockets cannot rotate, put the same clip position on every socket, and check alignment every few feet while hanging.