Mastering Chimney Chase Framing: A Comprehensive Guide
Framing a chimney chase is a critical step in masonry construction, ensuring the longevity and safety of your chimney. This guide will walk you through the process, from understanding the basics to the final touches, helping you achieve a robust and secure chimney chase frame.
Understanding Chimney Chase Framing
Before we dive into the step-by-step process, let's understand what chimney chase framing is and why it's crucial. A chimney chase is a structure that encloses a chimney, providing a safe passage for smoke and other byproducts to exit your home. Framing this chase ensures it's securely attached to your home's structure, preventing movement and potential damage.
Tools and Materials Needed
- Tape measure
- Circular saw
- Drill and driver bits
- Hammer
- Nails (16d and 8d)
- Galvanized hangers
- 2x6 and 2x8 pressure-treated lumber
- House wrap
- Caulk
Step-by-Step Chimney Chase Framing Process
1. Measure and Cut the Top Plate
Start by measuring the width and height of your chimney. Cut two pieces of 2x8 lumber to these dimensions. These will serve as the top plate of your chase frame.
2. Assemble the Top Plate
Using 16d nails, attach the two pieces of 2x8 together, creating a square frame. This will sit atop your chimney, providing a stable base for your chase frame.
3. Install the Top Plate
Position the assembled top plate on top of your chimney, ensuring it's level and square. Secure it to the chimney using galvanized hangers or masonry screws.
4. Cut and Install the Side Jambs
Cut two pieces of 2x6 lumber to the height of your chimney plus 16 inches (to accommodate the bottom plate). These will serve as the side jambs of your chase frame. Install them on either side of the top plate, using 16d nails to secure them together.
5. Install the Bottom Plate
Cut a piece of 2x8 lumber to the width of your chimney. This will serve as the bottom plate. Install it at the base of your side jambs, using 16d nails to secure it in place.
6. Install the Backer Boards
Cut pieces of 2x8 lumber to the height and width of your chase frame. These will serve as the backer boards, providing a surface for your masonry to bond with. Install them on the back of your chase frame, using 8d nails to secure them in place.
7. Wrap and Caulk
Wrap your chase frame in house wrap, securing it with staples or nails. This will help prevent moisture from entering your chase frame. Finally, apply a bead of caulk around the entire perimeter of your chase frame, creating a seal that will further protect your frame from moisture.
Tips for a Successful Chimney Chase Frame
Always use pressure-treated lumber for your chase frame. This will help prevent rot and decay, ensuring the longevity of your frame. Also, ensure your frame is square and level throughout the installation process. A crooked or unlevel frame can lead to structural issues down the line.
If you're unsure about any aspect of the process, don't hesitate to consult with a professional. The safety and longevity of your chimney depend on a properly framed chase.
