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Fine Homebuilding Project Guides

Siding & Exterior Trim

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  • Choosing Siding
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How-To

How to Install Corner Boards, Skirtboards, and Clapboards on a Garden Shed

Add furring strips and assemble your cornerboards first to make this siding and trim job go smoothly.

With the furring in place, we’re ready to begin the trim and siding. We’ll focus on the lower half first, starting with the corner boards, which I pre-assemble.

First, I bevel the edge of each board on the table saw. Then I join the halves together with trim screws, and I break the corners with a quick pass of the block plane. Corner boards are very susceptible the moisture from the ground, so seal the end grain with at least two coats of primer.

I butt each corner board tight to the underside of the sill and fasten it with ring-shank nails. As long as the corner boards are installed plumb, the skirtboards that fit between them should fit squarely without any gaps. Because trim boards are not always the same thickness, you may have to cheat the skirtboards out a little with shims so they are flush with the corner boards.

Above our skirtboards we are going to put in a wooden drip cap. It just rests right on top and gets a few nails down and into the skirt. The drip cap helps direct water away from the skirtboard, and also spaces out the bottom edge of the first course of clapboards.

We want an even exposure between our courses of siding, so what I’m going to do is measure from the top of my drip cap to the underside of my sill. It’s just shy of 32 inches. Now a 4-in. exposure makes that real easy—we’ll just do eight courses. I’m going to measure and mark that on a story stick that I can use to transfer those measurements all the way around the building.

The clapboards are cut just a hair longer than the space between the corner boards so I can spring them into place for a snug fit. Remember to prime all cuts and to fasten the pieces with a single nail at each framing member. In order to make out last course fit, I had to rip it down to the exposure, which is four inches.

I’ve gone about as far as I can go with the lap siding on the bottom half of the building. I have to install the uprights around the door before I finish the clapboards on the front of the shed, because that’s what I’m going to butt the siding up into.

The lower half of the building is now done. In the next episode we’ll move on to the upper half, which is board-and-batten siding.

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Videos in the Series

  • How to Build a Garden Shed: Introduction

    In this video series you’ll see the step-by-step process as we fabricate and assemble all the parts of this garden shed including the tips and techniques you’ll need to know to build one for yourself.

  • How to Build a Foundation and Frame a Floor for a Garden Shed

    Construct a sturdy platform for your outdoor storage space out of compacted gravel, concrete blocks, and pressure-treated 4x4s

  • How to Frame Garden-Shed Walls with Half-Lapped 4X4s

    For the walls of this shed I wanted to continue the same timberframe look without the complicated joinery. So, just like with the floor frame, I relied on half lap…

  • How to Frame a Garden-Shed Roof and Install Skip Sheathing for Cedar Shingles

    The half laps at the top of the roof rafters are basically the same as the half laps used for the floor and walls, but they are set on an…

  • How to Install Cedar-Shingle and Clear-Polycarbonate Roofing on a Shed

    Follow along with custom builder Justin Fink as he finishes each side of this simple shed roof with different materials.

  • How to Install Garden-Shed Windows and Doors

    Tack the windows in place with screws before you check for level and permanently fasten them

  • How to Install Corner Boards, Skirtboards, and Clapboards on a Garden Shed

    Add furring strips and assemble your cornerboards first to make this siding and trim job go smoothly.

  • How to Install Board-and-Batten Siding on a Garden Shed

    First install the blocking, and then nail on the boards and battens.

Previous: Good-Looking, Long-Lasting Lap Siding Next: Dress Up a Gable With Shiplap Siding

Guide

Siding & Exterior Trim

Chapter

Installing Siding

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Choosing Siding
  • Materials
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Installing Siding
  • Siding Basics
  • Lap Siding
  • Shingle Siding
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  • Fiber Cement and Composite Siding
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Choosing Exterior Trim
  • Trim Materials
  • Trim Design
Installing Exterior Trim
  • Trim Basics
  • Roof Eaves Trim
  • Corner Boards
  • Corbels & Brackets
  • Window & Door Trim
Repairing Siding & Trim
  • Trim Repairs
  • Siding Repairs

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