Articles about DIY




Advantages of a Fiberglass Septic Tank

By Damien Andrews

I’ve installed a number of septic tanks and their necessary drain systems over the past forty years. Back in the day, we only got to choose from concrete or steel. Today, fiberglass septic tanks are available and offer several advantages to both the installer and home or property owner.

Advantage #1

You will not need to dig as large a hole for a fiberglass septic tank as you will for a concrete septic tank. A fiberglass septic tank is complete when it’s installed in the ground. Concrete will need a lid installed, and that will usually mean mortar all around the outside edges to ensure a good seal. The hole for a concrete septic tank must be large enough to accommodate the application of the mortar by a person.

Digging a smaller hole means less backhoe digging time, less cover-up time, a faster installation, and saved dollars!

Advantage #2

Since a fiberglass septic tank is not porous, tree roots won’t bore through the walls and into the tank. Fiberglass septic tanks are not totally immune to tree root damage, but the chances of such damage are dramatically reduced.

Advantage #3

Fiberglass septic tanks are much, much easier – and therefore less costly – to install. A 1,000 gallon fiberglass septic tank weighs between 350-400 pounds. These can be moved in a pickup truck. The backhoe can easily lift a fiberglass septic tank, and one man can shift it for perfect positioning. Moving and installing a 1,000 gallon concrete septic tank requires special heavy equipment and more manpower.

The lighter fiberglass septic tanks are also easier to reposition when they are placed in their holes. We shift them all around using a couple of 2” x 4” x 8’ pieces of stud lumber. This is especially helpful when leveling properly.

Advantage #4

Fiberglass septic tanks are not damaged by prolonged exposure to sewerage and sewerage gasses.

Advantage #5

Easier connections can be made on fiberglass septic tanks. You don’t need to mix mortar and stabilize in and out piping for fiberglass septic tanks. The in and out holes are cut much more precisely, and are about as simple to plumb as PVC drain lines. Also, unlike mortar connections, which require extended drying times, connections in and out of a fiberglass septic tank dry in minutes.

Advantage #6

A fiberglass septic tank is easier to repair. Patching fiberglass is a much simpler and less costly event than repairing concrete. When we have to do a concrete repair job, I call in my part time mason. To ensure a concrete patch is perfect, you need that kind of (costly) expertise. When we need to repair a fiberglass septic tank, we just use fiberglass repair kits from the local marina or auto parts store. We’ve never had one fail yet.

Advantage #7

Since a fiberglass septic tank weighs so much less, it can be installed in many more locations. This is a tremendous advantage if you live in a hilly or mountainous area – like I do. You can get your fiberglass septic tank installed where you want it, not just where the large, heavy truck can get in and drop it off.


There are many advantages to installing a fiberglass septic tank. Whether you’re the land owner or the installer, fiberglass is the premium choice for easy installation, longevity and incident-free service life. Also, the advantages of a fiberglass septic tank always add up to saved dollars – now and later. I always recommend installing a fiberglass septic tank – and you should always insist on having one installed.


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