20Senlac Green Roof: Shrubs In Tubs - Part 3 -Insulated Planters

Shrubs In Tubs - Part 3 - Insulated Planters

We decided to plant some junipers up in the trough. Rather than using tubs I built a couple of insualted planters that had legs to hold them up near the top of the parapet,

These planters are about 12" wide , 13" deep, and 30" long (0.3m by 0.33m by 0.76m). They hold the same amount of growing medium (same design weight) as the tubs but in a form more supportive for junipers.

They are constructed from 0.5" (12mm) Crezon around a skeleton of 2" by 2" wood. The 2" timber matches the 1.5" EPS perfectly. More like five mini SIP panels than a complete skeleton.

There is no right or wrong way to do this. Here are some photos to show how I did it. The legs are actually the outer pieces of the ends of the planter. They are about 24" tall to match the height of the parapet. The 2" timber basically provides something solid to which the crezon panels can be attached/ screwed.

The coaming is also Crezon, about 1" bigger than necessary, to create a drainage lip on its outer perimeter.

Drainage is provided by a 1.5" dia PVC pipe drilled through and well caulked into the base. The inlet to the drain is a plastic grommet of the type normally used for neatly passing computer cable through a desk top. Well caulked.

All the seams are well caulked with a silicon sealant. Didn't worry about the lack of paintability because the joints are out of sight when viewed from ground level.

Four coats of good exterior paint.