GRP vs Concrete Planters for Podiums & Roofs

Choosing planters for a podium, terrace or roof garden? Here is how GRP compares with concrete.

Weight

GRP planters are much lighter than concrete, which matters on podium slabs and roofs.

Shapes and sizes

GRP is moulded to your drawings, including curves, long troughs and custom heights.

Weather

GRP resists sun, rain and impact, and does not crack the way thin concrete can.

Installation

Lighter planters are easier to lift into place and move later.

Drainage

Every planter still needs a working drain. Fit a planter drain and keep the outlet clear. See GRP planter boxes.

Side by side

	GRP planters	Concrete planters
Weight	Light	Heavy
Shapes	Made to any drawing	Limited by formwork
Weather	Resists sun, rain and impact	Thin sections can crack
Installation	Easy to lift into place	Needs lifting equipment
Moving later	Possible	Difficult
Finish	Gel-coat, colour on request	Paint or render

Planter build-up

Inside the planter: a drainage layer at the bottom, filter fabric above it, then soil. A planter drain with mesh dome lets water out while keeping soil in.

Sizes and colours

GRP planters are made to your drawings, including long troughs and custom heights, with a gel-coat finish in the colour you choose. See GRP planter boxes.

Frequently asked questions

Are GRP planters suitable for roof gardens?

Yes, GRP is lightweight compared with concrete.

Can GRP planters be made to custom shapes?

Yes, they are made to your drawings.

Do GRP planters need a liner?

GRP is waterproof, but a drainage layer, filter fabric and a planter drain are still needed for healthy plants.

Can you make long troughs?

Yes, GRP planters can be made as long troughs or custom shapes to your drawings.

How do I clean GRP planters?

Wash the gel-coat with water and a mild detergent.

Request a quote – send your sizes, quantities and drawings or site photos and we will reply with options and a price.

GRP vs Concrete Planters for Podiums and Roof Gardens