Learn the difference between “stair-stepping” and “staggering” shingles when you have to know how to shingle a roof, and why staggering, though faster, is more controversial.

How to shingle a roof: Stair-step or stagger?

How to shingle a roof: Stair-step or stagger?

Many pros shingle in a vertical line up the roof because it’s much faster.

Known in the trade as a vertical racking or staggering, this method enables the roofer to install a single column of shingles all the way to the peak, without the wasted back-and-forth motion necessary to fill several rows of stair steps.

Not only that, the shingles can be piled just to the side of the column being laid. This saves a lot of time moving shingle bundles and a lot of back strain.

After completing a column, the roofer can go back down to the eave edge of the roof and start laying the next column of shingles.

Both step shingling and racking will yield a watertight roof.

You won’t void your warranty by going with the racking method, but with some manufacturers, you’d have trouble collecting a settlement on two specific problems: pattern-curling and shadowing (colour blending).

Pattern curling is caused by the roofer having to lift the end tab of every other shingle to install the last shingle nail in the end of the next shingle.

Because the bending can stress and deform shingles (especially in cold weather), the ends of those shingles may warp over time, creating a prominent pattern on the roof.

If this happens during your how to shingle a roof project, you’re out of luck collecting on a warranty if your shingle manufacturer doesn’t approve of racking.

Shadowing is the patchwork appearance caused by subtle colour differences among different bundles of shingles.

The problem is usually worse with racking because all the shingles from one bundle wind up in vertical rows.

If the adjacent shingles come from other bundles that are a slightly different colour, the roof may look patchy or even striped.

The stair-step method tends to spread and mix the bundles better.

Prevent shadowing by checking to make sure all the bundles have the same lot number on the wrapper, not just the same colour.

However, some manufacturers’ color blends are so consistent that they don’t have or need lot numbers.

Check the instructions on the shingle wrapper.

Some companies make shingles that can be used with either shingling method, but they have two sets of instructions to ensure an even colour pattern.

If the instructions aren’t clear, call the manufacturer to find out if racking shingles is recommended or not.

Required tools for this project
Have the necessary tools for this how to shingle a roof DIY project lined up before you start you’ll save time and frustration.

Chalk line
Roof harness
Utility knife
Roof brackets

Required materials for this project
Avoid last-minute shopping trips by having all your materials ready ahead of time for this how to shingle a roof project.

Here’s a list.
Roofing nails


1. Racking shingles

1. Racking shingles
The Family Handyman

Racking shingles means installing them straight up the roof in a column.

2. Stair-stepping shingles

2. Stair-stepping shingles
The Family Handyman

Stair-stepping shingles means installing them in a stair pattern.