Concrete underground stormwater storage system,TerreArch, offers advantages to the job and site and is often less expensive than installation of plastic pipe.
Below is a general guide and things to consider when costing out your underground stormwater storage project.
*The costs for any project should be evaluated independently.
*The costs for any project should be evaluated independently.
1. What are the material costs?
Get pricing
TerreArch - we'll look at your drawings and provide you with a price for TerreArch
Plastic Pipe - get a price for all required materials: plastic pipe, fittings and manholes
2. What are the costs to prepare the site for installation?
TerreArch: Get a price to dig the pit and to lay the sub-base
(*Note: we often see that the footprint for TerreArch is LESS than needed for plastic pipe. You may realize a cost savings by digging a smaller pit and eliminating unnecessary structures)
Pipe: Get a price to dig the pit and lay the sub-base (because of the non-structural nature of plastic pipe, you may need extra sub-base)
What are the costs for TerreArch and what are the costs for plastic pipe?
3. Delivery:
TerreArch - Arrives just in time and installs immediately (no unloading or storage space needed)
Plastic Pipe - Delivered on site - must be unloaded and stored
How much additional time will unloading and storage of plastic pipe cost your job?
4. Installation:
TerreArch - A company representative is on site for every installation. Each TerreArch piece typically installs (pick to set) in about 7 minutes. This means a crew of 2 or 3 can install, backfill and cover up to 50,000 cubic feet of storage in just one day!
Plastic Pipe - Multiple crew members are needed to get pipe from storage, re-stage and set up on site. It is important that the pipe be laid in strict accordance with manufacturer's instructions. Your team needs to assemble pipe layout and attach with cumbersome fittings then secured by hand with stone from the 6 to 9 o'clock positions.
Plastic fittings can be lost or broken. Remember, your plastic pipe stormwater storage is only as good as your weakest connection.
How much additional time will assembling and securing plastic pipe by hand, in strict accordance with manufacturer's instructions, cost your job?
5. Completing Installation:
TerreArch - Get a price for bulldozing stone over the top - upon completion, site is easily accessible to all cars and heavy equipment.
Plastic Pipe - Crew members must now complete securing the pipe in-place by hand in strict accordance with manufacturer's instructions before site can be accessed by cars and heavy equipment.
How many days will it take X # of crew members to complete securing plastic pipe in place by hand and laying stone around pipe and above to the proper height? How much does that add to the cost of your job?
6. Post-construction and Structural Integrity:
TerreArch - arrives on site as a structural piece with an HS-25 rating. Installation of TerreArch eliminates the opportunity for creep and post-construction subsidence issues.
Plastic Pipe- is not structural. Even when manufacturer's instructions are strictly followed, plastic pipe can and has failed and it can also easily creep.
7. Post construction inspection:
TerreArch - offers easy access ports for inspection - anytime.
Plastic pipe- no access ports - post construction inspection is difficult at best
8. One last consideration:
It is important to install TerreArch or plastic pipe on a clean bed of stone. If you can't complete the installation of your underground stormwater storage system in one day, it rains and the stone gets dirty, the base stone needs to be cleaned and re-laid.
Can you afford not to consider TerreArch?
Get pricing
TerreArch - we'll look at your drawings and provide you with a price for TerreArch
Plastic Pipe - get a price for all required materials: plastic pipe, fittings and manholes
2. What are the costs to prepare the site for installation?
TerreArch: Get a price to dig the pit and to lay the sub-base
(*Note: we often see that the footprint for TerreArch is LESS than needed for plastic pipe. You may realize a cost savings by digging a smaller pit and eliminating unnecessary structures)
Pipe: Get a price to dig the pit and lay the sub-base (because of the non-structural nature of plastic pipe, you may need extra sub-base)
What are the costs for TerreArch and what are the costs for plastic pipe?
3. Delivery:
TerreArch - Arrives just in time and installs immediately (no unloading or storage space needed)
Plastic Pipe - Delivered on site - must be unloaded and stored
How much additional time will unloading and storage of plastic pipe cost your job?
4. Installation:
TerreArch - A company representative is on site for every installation. Each TerreArch piece typically installs (pick to set) in about 7 minutes. This means a crew of 2 or 3 can install, backfill and cover up to 50,000 cubic feet of storage in just one day!
Plastic Pipe - Multiple crew members are needed to get pipe from storage, re-stage and set up on site. It is important that the pipe be laid in strict accordance with manufacturer's instructions. Your team needs to assemble pipe layout and attach with cumbersome fittings then secured by hand with stone from the 6 to 9 o'clock positions.
Plastic fittings can be lost or broken. Remember, your plastic pipe stormwater storage is only as good as your weakest connection.
How much additional time will assembling and securing plastic pipe by hand, in strict accordance with manufacturer's instructions, cost your job?
5. Completing Installation:
TerreArch - Get a price for bulldozing stone over the top - upon completion, site is easily accessible to all cars and heavy equipment.
Plastic Pipe - Crew members must now complete securing the pipe in-place by hand in strict accordance with manufacturer's instructions before site can be accessed by cars and heavy equipment.
How many days will it take X # of crew members to complete securing plastic pipe in place by hand and laying stone around pipe and above to the proper height? How much does that add to the cost of your job?
6. Post-construction and Structural Integrity:
TerreArch - arrives on site as a structural piece with an HS-25 rating. Installation of TerreArch eliminates the opportunity for creep and post-construction subsidence issues.
Plastic Pipe- is not structural. Even when manufacturer's instructions are strictly followed, plastic pipe can and has failed and it can also easily creep.
7. Post construction inspection:
TerreArch - offers easy access ports for inspection - anytime.
Plastic pipe- no access ports - post construction inspection is difficult at best
8. One last consideration:
It is important to install TerreArch or plastic pipe on a clean bed of stone. If you can't complete the installation of your underground stormwater storage system in one day, it rains and the stone gets dirty, the base stone needs to be cleaned and re-laid.
Can you afford not to consider TerreArch?
Do the math! Pull your costs together. Let us look at your project and submit our quote. This quick exercise has saved many projects and contractors thousands of dollars and the structural integrity of concrete provided long term peace of mind.
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