Greenhouse renovation feasibility.

[BrassavolaStars]

Hello All,

I am still finalizing my greenhouse renovation project. I wanted to run this plan by the orchidboard to make sure it is feasible and structurally sound.

I plan to excavate 4 inches or so and level the greenhouse floor (which is currently topsoil) and fill it with 3 inches of sand and top it off with pavers.

Some people have told me I would need partially buried retaining walls under the perimeter of the base (my base has metal footers that go into the ground rather than an underground foundation) to do this so the sand doesn’t escape from under the base of the greenhouse as I will have to dig around it. Is this true? I don’t think I could add this type of retaining wall as the metal footers on the base would obstruct the installation of a retaining wall.

I also need to make sure there is no gap between the base and the ground/new floor as I can’t have cold air getting in during the winter. As you can see in the photos, I already have a problem with gaps that need to be fixed. No matter how much extra soil I put, they also seem to reappear.

I have attached some photos of the base and a link showing the blueprint for my greenhouse’s base for visualization purposes.

Link to base:

https://grandiogreenhouses.com/manua...r_feb_2016.pdf