How to Build a Custom Cedar Raised Bed with Tall Posts

Quick Answer

To build a custom cedar raised garden bed with extra tall posts, start by planning your dimensions, then assemble the frame using extra tall posts and cedar boards, stacking layers as needed to reach your desired height.

Step-by-Step Building Guide

1. Plan Your Bed Dimensions: Decide on the length, width, and total height of your raised bed. Remember that each board layer adds 5.5 inches of height, and each extra tall post can hold up to three boards (16.5 inches). Sketch a simple diagram to visualize the layout. Double-check that your chosen dimensions are multiples of board lengths to avoid cutting.
2. Gather Materials and Tools: You'll need extra tall posts for each corner (and possibly mid-span for long beds), cedar boards for the sides, and basic tools like a drill, screws, and a level. Use the product facts above to estimate quantities based on your plan. Order a few extra boards and posts to account for mistakes or future adjustments.
3. Set the Corner Posts: Place the extra tall posts at each corner of your planned footprint. Ensure they are plumb (vertically level) and spaced correctly. For a taller bed, you may need to sink the posts into the ground for stability, or use a base frame to keep them upright. Use a level to check both vertical and horizontal alignment before securing.
4. Attach the First Board Layer: Starting at the bottom, attach the cedar boards to the inside of the posts. Use corrosion-resistant screws. Make sure the boards are level and flush against the posts. For a 5.5-inch layer, each board will fit snugly between posts. Pre-drill pilot holes to prevent the cedar from splitting.
5. Stack Additional Layers: If you want more height, add another board layer on top of the first, securing it to the posts. The extra tall posts are designed to hold up to three boards per layer, so you can add up to 16.5 inches per post section. For even taller beds, stack another post on top of the existing one. Check that each new layer is level and securely attached before adding the next.
6. Reinforce and Finish: Once all layers are attached, reinforce the corners with additional screws if needed. If you plan to stain or seal the wood, do it now before filling with soil. This protects the cedar and extends its life. Let any stain or sealant dry completely before adding soil to avoid chemical leaching.

Product Facts

• Premium Cedar Extra Tall Post 17 in x 2.5 in x 2.5 in RCXTP: The premium cedar extra tall post measures 17 inches high and can hold three 5.5-inch tall boards, adding 16.5 inches of height per layer. Posts can stack on top of each other for quick expansion. This means you can easily increase your bed's height without buying new posts—just stack another layer when you need more depth.

  

• Premium Cedar Board 24 in x 5.5 in (3/4 in Thick) RCB24P: The 24-inch premium cedar board is 5.5 inches tall and 3/4 inch thick, made from untreated cedar that can be stained or left natural. This board size works perfectly with the extra tall posts, letting you customize your bed's length and height with simple, durable components.