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Cutting Gable-End Siding

I’ve cut gable-end siding every way imaginable. When I first started working as a carpenter, I cut each piece one at a time, measuring the angles with a bevel square. Geeez was that slow!


(Note: Click any image to enlarge)

It wasn’t long before I graduated to making a pitch block—a gauge block cut to the exact pitch of the roof. On production projects I could stack up six or seven pieces of fiber cement siding, hold my breath, and make that long rake cut with a circular saw. Usually the boards near the top of the stack came out straight, but the boards on the bottom half of the stack…well, not so much.

Guide Block-1Then, one day on a neighboring jobsite, I saw a guy using a pitch block with a guide attached to one edge. Brilliant! I’ve made guide blocks like that for years, and I’ve even used some with a circular saw. I just hold the guide block and run the saw table right along the edge to keep the saw straight.

But one of the fastest methods I know of—if the framing is dead-on accurate—is gang cutting the gable-end siding.

The pitch of the roof is the first thing I need to know. Of course, if I’ve framed the roof myself, I know the exact pitch. But sometimes I work on remodels or follow behind other framers. When I first started working in construction, it used to surprise me to find roofs that were pitched at 6 3/4 in. or 5 3/8 in., but not anymore. Homes settle, green framing lumber dries out and changes, and sometimes the framers who built the roof just simply framed it to some odd pitch. At the end of the day, it doesn’t really matter. What does matter is determining the exact slope as easily as possible. Bevel squares and speed squares are great tools, but they just aren’t accurate enough over a long run. I calculate the pitch by drawing right on the gable-end wall.

With a long level—sometimes an 8 ft.’er—I mark a horizontal line on the wall, butting one end against the rake. Then I draw a plumb line up to the rake on the high side. I strike that plumb line at an even foot increment—like 5 ft., 6 ft., 7 ft., or even 8 ft., if I can reach out that far and the gable is wide enough. That way I know exactly how many inches the roof rises per foot.

After I’ve calculated the pitch of the roof, I lay out as many courses of siding as I can on my worktable, using cutoffs and scrap for the top pieces. I can pick any distance to measure in from the edge. On this small gable, I measured 3 ft. across for the run. Since the roof was cut at a 4/12 pitch, the gable climbed 4 in. for every 12 in. of run. So in 3 ft., the roof rose 12 in.


Laying out those dimensions is a snap—a lot easier than fooling around with a protractor. Before I had a track saw, I used to snap lines for these cuts, and then follow the chalk line with a circular saw, but I don’t do that anymore. I’m pretty good with a worm driver, but track saws cut a lot cleaner and more precisely. Besides, on this pre-finished siding, I didn’t want to snap chalk lines!

Track Saw-1

The only other measurement I need is the o.d. of the first (lowest) piece—from long point to long point. And that measurement has to be exact. Of course, there can be minor differences in succeeding pieces, and a tiny bit of wiggle room in the shiplap joint from course to course usually helps more than it hurts. I can always raise a piece of gable siding 1/16th of an inch if I need to. However, if the siding is too long, I have to climb down the ladder, cut the board, and seal the endcut again.

Measuring 1st piece-1

After plotting my mirror image points on the opposing side of the gable, I can lay my guide rail on the pencil marks. Next, I use my track saw—a contemporary carpenter’s newest friend—and make the long precise rake cuts on both sides of the gable. Then, I notch out the last piece with a jig saw so it fits nicely around the ridge.

This system of pre-cutting so many pieces works great for shiplap siding over a short run, but in my experience, it doesn’t work so well for lap siding, where the pieces can’t be held securely while I’m making the saw cut.

_MG_2155-1 Like any wood or wood product material, I also make sure to prime my cuts so they’ll stay straight and true long after I nail off the boards.


13 Responses to “Cutting Gable-End Siding”

  1. sc williams

    Nice article Scott! You laid out a real clear explanation of some different approaches to get to the finished product.

    I agree with you. The track saw is seeing more and more use on the jobsite. Simple and accurate and, especially with pre-finished material, often a real advantage.

    Any reason not to use a nail gun?

    That last small piece goes in pretty tight. No need for a gap?


    • Scott Wells

      Thanks, SC. We nailed all of the siding on that project by hand with 3″ nails. I have a couple of nice siding guns that only shoot up to 2.5″ nails, but I really wanted to use 3 inch nails due to the multiple layers we needed to penetrate before we got to the studs. And I really didn’t want to use framing guns on that soft pine siding. As far as that last piece of siding; it was “a little tight.” I feel confident it will be fine. The moisture content of that siding was a little high at the time of installation, so we didn’t always climb down and re-cut. Especially on such a small piece.


  2. Blake Mckay

    Great article! Gang cutting with the tracksaw definitely speeds things up. I spend most of my days working interiors. Shelving, doors, trim etc. We just started using the tracksaw. We use the saw to gang cut shelves and square up sheet goods all the time. And for long tapered cuts such as the ones described in your article, it works great!

    Nice job!

  3. Scott Wells

    Thanks, Blake. The track saw has been a real game changer for me. Anytime I need a straight line, and it doesn’t make sense to use the table saw, it’s what I go to.


  4. Tim Uhler


    I enjoyed your article. I have a question for you on the track saw. As a framer and sider what uses do you find for it?

    Maybe write an article on that! I’d love to read it.


    • Scott Wells

      Thank you, Tim.

      I’m not sure if I’ll write a review on the tracksaw. We’ll see.
      The primary function of my company is remodeling. Although we perform all of the carpentry on our projects, we are not an everyday framing/siding company. So, I’ve had lots of occasions to use the tracksaw for many different purposes.

      As far as framing uses, the tracksaw could be handy in cutting floor, wall, and roof sheathing depending on your setup. Also in breaking down sheet goods for rough stairs. I see more advantages in using the tracksaw for exterior siding and trim work: tapered columns, soffit trim, custom window/door trim, and any other time you need a straight cut with no tear-out.

      Let’s face it, before track saws were invented, we were still able to perform all of these facets of carpentry. The tracksaw is just another tool to have in your arsenal. It certainly doesn’t replace a skil saw or a portable table saw, but it does help my work come out cleaner and more precise, and sometimes, faster.

      You’re right, maybe this topic would make a good article.


  5. Chris Mattix

    I have a couple of questions. First, my gable end has no over-hang (see picture). I’ve already taken the rake boards off the gable end during siding removal. So, how do I determine the angle (roof pitch) for the gable end to use for cutting the siding? Note: I will be putting the new rake boar on top of the new siding.

  6. Scott Wells

    There are several different ways to determine that pitch, but in your situation, here’s what I would do: since you are putting your rake fascia on top of the new siding you won’t need perfect angled cuts. So, I would simply work up the horizontal siding until you intersect the roof, and then set a piece of siding in place, letting it extend above the roof, and make pencil marks on the siding where it intersects the roof. That will probably be enough to give the rough angle you need to make a shooting board, or a pitch angle board that you can make pencil lines with on you siding pieces as you work your way up the rake.
    If you plan to cut multiple pieces on the ground you can stack several pieces of siding on top of each other and “gang” cut the rake angle on the several pieces with one line and one push of the saw.
    And, if you want to be more precise with the exact angle of the roof, take your longest level and make a level line somewhere on the gable that intersects the rake. Then draw a plumb line near the end of that level line that’s furthest from the rake, and measure both of those dimensions where the lines intersect. You can punch those numbers into a construction calculator (or, you can do it longhand using the Pythagorean Theorem) as the rise and run, and it will spit out the pitch angle.
    Hope this helps, and good luck with your project.


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