Toosh
Veteran Member
I’m looking to replace 7 year old pressure treated raised beds. Current beds are 3’ x 10.’ I would like to stay close to that. I have access to a bunch of free durock concrete backer boards. They are ½” thick, 3’x5’ boards. What I have in mind is to rip them 18” tall, 5’ long. I’m thinking about doubling them to 1" thick because I think that is needed to support the weight of soil. I plan to join two lengths to make a 10’ bed.
Questions:
Questions:
- Is this product feasible for this application? It seems like a genius idea to this blond so why have I not seen it done before?
- I assume it won’t rot but will it erode from wet soil/water?
- Better to join two boards to 1”thick with exterior block adhesive or concrete?
- Will water getting between panels erode them? Should I fill the top seam where I double the thickness with concrete?
- Should I skim coat the sides or will the backer board be damaged by string trimmer? By burning weeds with a torch?
- How should I join the corners? I’m trying to stay away from wood.
- Can I span 5’ if I go 1” thick?
- Other concerns I haven't thought of? Suggestions?