I was looking at the lean to Greenhouses and was wondering: My house has an uneven surface (brick). How would I fill in the gaps between the mini greenhouse and the wall?
There are two different ways to go here.
You could use insulation strips. They make great products for insulating garage doors and for attaching campers to pickup beds. You can also use the “foam in a can”; it works great.
Another way to go would be to enclose the back of the greenhouse with a sheet of plywood. You would want to treat the wood to protect it from moisture first. Then you can put it up against your structure without concern for you structure or insulation.