A wooden base is a solid option to build your greenhouse on and it requires just a few more steps than the wooden perimeter base.
1. Choose The Materials
You can choose between two options: pressure-treated wood or naturally resistant wood, like cedar, redwood, or black locust.
2. Build The Wooden Frame
Once you’ve chosen the wood, make a 6-inch width perimeter base in the measurements of your greenhouse. Use 6x6 timbers preferably. You can start by laying out the frame on the floor before attaching the ends. Use a carpenter’s square to make sure you have the right 45 degrees angle in each corner and intersection, and level it both vertically and horizontally.
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The wooden frame must be fixed to the ground. An easy way to do this is to drill holes in the wood, use two bars between 2-foot sections, and hammer them straight into the ground. This will support most commercial greenhouses.
3. Level your base
Another way to fix the wooden frame to the floor is to drive level 6x6 inch posts into the ground which you can secure with concrete and attach the wood frame on top of them. The number of stakes or posts will depend on the size of your greenhouse.
You want your base to be a very leveled surface so you can use string levels for the corners of the platform to make sure it is even. Another tip to ensure your frame is perfectly squared is to measure from corner to corner to see if the diagonals are the same size.
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4. Bridge The Structure
Screw wooden planks across the frame. Depending on the size of your greenhouse it may be necessary to bridge the structure and place sized boards between each of the interior boards. The bridging will make a more solid foundation ensuring the proper spacing to avoid any shifting in the future.
Here’s a great YouTube video that shows how to do this:
5. Add a Wooden Cover
Place boards on top to cover your deck and secure them with nails or screws. You can always add steps at the entrance of your greenhouse to give it a nicer look!