PERMA-DRY SYSTEM® (PDS) is an interior basement drainage system, commonly known as an Internal French Drain. It is a system which relieves the hydrostatic pressure and high water table against the foundation that is caused by poor drainage on the exterior of the foundation.
Is this system for you?
If you have a poured concrete foundation and are having water seepage where the wall meets the floor and/or there is a high water table that forces water up through your basement floor causing water puddles or flooding, then you should consider having the PDS installed.
The same applies if you have a cinder block or stone foundation.
The PERMA-DRY SYSTEM®
When existing draintiles (french drain) fail to drain properly or in some cases, no draintiles exist, abnormal hydrostatic pressure builds up (high water table) on the outside of the foundation wall forcing water up through cracks in the floor, where the wall meets the floor, through cold joints, or through blocks or cracked mortar in block or stone foundationss.
Internal Drainage System Installation Process:
The PERMA-DRY SYSTEM® is installed by removing a portion of the floor along the perimeter of the foundation wall creating a trench. In the trench, we first place a bed of 3/4" washed stone and then 4" PVC perforated pipes that are connected and pitched towards the PERMA-PUMP™ System (sump pump and pit) and buried in 3/4" washed stone allowing a clear path for water flow to find the sump pump system.
Attached to the pipes at select locations are inspection caps (cleanouts). The inspection caps give future access to the inside of the pipes in case future cleanout is needed.
A Dry-Cove membrane is also installed up the wall approximately 4"-6" and down to the 4" PVC perforated pipe allowing any future foundation wall leaks (i.e. foundation wall cracks, tie rods, windows, etc.) to channel behind the Dry-Cove and into the perimeter drain.
The sump pump pit is installed at the lowest point of which the PVC pipes were pitched. The sump pump sits at the bottom of the pit and is connected to a vertical pipe which discharges the water brought in by the perimeter drain and through the basement wall to the outside and away from the foundation. The discharge pipe from the sump pump can be above ground or connected undergound into a bubbler pot or a PERMA-WELL™ (drywell). Battery back-ups and high water alarms can also be installed to the PERMA-PUMP System.
Once the PDS is in place, additional 3/4" washed stone is placed over the pipes in the trench and then the trench is recemented to match existing floor level.
Eliminates costly landscape and driveway damage
Can be installed in any season or weather
Easy indoor inspection
Drains protected from crushing and clogging
Capable of venting radon gas
Why PERMA-DRY SYSTEM® versus the Conventional Draintile?
The following chart compares the advantages of...
Advantages of PDS
Not usually guaranteed
Excavated soil is replace with washed stone eliminating silt filtration
Outside draintile systems are usually backfilled with excavated soil. Rain will filter through the soil allowing silt and fines to settle in draintile eventually clogging it again
Allows drainage if walls leak in the future because of cracks, tie holes and condensation
Doesn't allow for drainage should walls leak because of cracks, tie holes and condensation
Easy to determine cause of any problems should they occur because it can be visually inspected from the inside and repairs can be carried out quickly and inexpensively. Cleanouts installed in each corner allow for checking for blockages and snaking out
Difficult to determine where clogs or problems occur and can be expensive to repair once buried under 4-8 feet of soil
Capable of venting radon gas
Does not vent radon
Rigid design gives strength & the smoothe inside of the pipe allows water to flow easily & without obstructions
Crushes easily and ribbing restricts water flow and catches silt and sediments building up and eventually blocking up
No effect on yard or landscaping
Requires extensive yard work reinstating lawn, driveway, decks, etc.