ᐅ Renovation of a Terrace with Edging and Issue of Rhizome Barriers

Hello everyone,

I am planning to renovate my old terrace by replacing the old patio slabs with new ones and edging the terrace with curbstones (currently, there are no curbstones). However, I am facing two challenges where I would greatly appreciate your advice and experience:

• Issue with bamboo and rhizome barrier: Right next to the existing terrace, I have planted bamboo that is contained by a rhizome barrier (see attached photo). My concern is that when dismantling the old terrace, the bamboo together with the rhizome barrier might shift towards the terrace. Additionally, I see a problem supporting the new curbstones with a concrete collar because the bamboo’s rhizome barrier is located directly beside it. How should one proceed in such a case? What techniques or tools do you recommend to ensure stability and keep the bamboo under control?
• Different heights of old and new patio slabs: The old patio slabs are 8 cm (3 inches) high, while the new slabs are only 6 cm (2.4 inches) high. Assuming the base of the old terrace is still in good condition, would it be possible to simply add 2 cm (0.8 inches) of sharp sand or aggregate, level it, and then lay and compact the new slabs on top? Are there any risks that the new terrace might not be stable or level?

I would be very grateful for any tips, techniques, or experiences you could share with me. How do you best approach projects like this, and are there any special considerations or materials I should keep in mind?

Thank you in advance for your support!

Are the old bricks really irreversibly worn out? To me, it looks like they just need a good scrub with a pressure washer and some cleaning detergent.

Hello and thank you very much for your response. No, the old stones are actually still in good condition. However, last year we built a second terrace with new stones and now want to use these on the "old" terrace as well to create a uniform look. We will then pass the old stones on within the family.

Please show how visible the new terrace is compared to the old terrace.

Good morning, thank you very much for your responses. So, the old patio stones will definitely be replaced with the new stones to ensure the same ones are used everywhere. The new stones have already been purchased and are already in the garden. Unfortunately, the issues mentioned above regarding the rhizome barrier and the uneven heights still exist. Could you possibly provide further assistance with this? Thank you very much, and have a great weekend!

Good morning, does this type of bamboo really need a root barrier? Isn't that a clumping variety?