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Siding & Exterior Trim

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How-To

Installing Exterior PVC Trim Corner Boards

Learn the best options for fitting outside corner boards and inside corners when installing exterior PVC trim.

By Ben Bogie

Sponsored by Boral

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Exterior PVC Trim: Corners, Inside and Out
Watch this episode of Shop Class to see the best options for fitting outside corner boards and inside corners when installing exterior trim.
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    For outside corners, there are a few choices you can do: a traditional butt joint with two pieces of square stock, a mitered corner or a pre-fabricated outside corner. Miters and butt joints need special care so they don’t open up over time, but the prefab corners can just be cut to length and installed in one step for a simple and great looking job.

    Being that we framed our rakes fascias and soffits first, it’s good to pay attention to where your corner boards are going to die into your soffit. I like to make sure that my corner dies completely into the soffit without any funny transitions. For inside corners we just use a simple  1-in. by 1-in. rip of PVC. You could fasten this with a full headed nail or a screw, but because of its small size i prefer to use 15-gauge 2-in. stainless steel finish nails to prevent blow out.

    Videos in the Series

    • Layout and Preparation for Exterior PVC Trim

      Builder Ben Bogie shows how to establish a control height as a reference point for laying out exterior trim on a house.

    • Exterior PVC Trim: Soffits, Fascias, and Rakes

      In this episode of Shop Class, builder Ben Bogie shares tips for getting tight joints, for cutting PVC trim with standard carpentry tools, and for keeping your job site clean when installing cellular-PVC trim.

    • Exterior PVC Trim: Water Table and Cap

      In this Shop Class video, learn how to use cellular-PVC boards and drip caps to create this traditional architectural detail that will be the foundation for your siding installation.

    • Installing Exterior PVC Trim Corner Boards

      Learn the best options for fitting outside corner boards and inside corners when installing exterior PVC trim.

    • Exterior PVC Trim: Wire and Pipe Penetrations

      In this episode of Shop Class, builder Ben Bogie shares tips for installing escutcheons to create solid mounting surfaces for exterior electrical and plumbing fixtures.

    • Installing Exterior PVC Window and Door Trim

      Learn how to assemble and install casings for windows and doors in a wall that has been furred out for a rainscreen.

    Previous: Low-Maintenance Eaves Next: How to Install Wood Corner Boards

    Guide

    Siding & Exterior Trim

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    Installing Exterior Trim

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