Basement Technologies®
Tel: 905-527-3325
Toll-Free: 1-888-744-4925
Fax: 905-527-6623

36 Albert St, Unit 2
Hamilton, ON, L8M 2X9

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Interior Waterproofing:
 » Interior De-Watering
 » Crack Injection
 » Ecofloor Dampproof Subfloors
 » Sump Pumps / Battery Back-Up
 » Backwater Valve Installation


Exterior Waterproofing:
 » Exterior Waterproofing
 » Window Well Repair


Foundation Repair:
 » Exterior Crack Repair
 » Bowed Wall Repair
 » Foundation Underpinning

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Bowed Wall RepairBowed Wall Repair and Stabilization (Carbon Fibre):

Bowed walls are almost always concrete block. They are becoming more and more prevalent with our climate change. Bowed walls are caused by 3 things, 1. Frost push, 2. Ratcheting affect from soil shrinkage and expansion during extremes of weather, 3. Static soil pressure is simply greater than the design load of the wall. Depending on the severity of the push, this problem is resolved 2 different ways.

1. Fortress Carbon Fibre/Kevlar foundation stabilization straps:

This is the preferred way to stabilize a foundation wall. Carbon fibre is the strongest tensile strength material known to man. When a concrete block wall begins to push in, the mortar joints on the inside must open up or to allow the "deflection" in order for the push to continue. Carbon Fibre straps are bonded to the wall with high strength epoxy resin to eliminate the deflection and stop the opening up of these mortar joints thereby increasing the load strength of the wall. The Carbon Fibre straps eliminate the continuance of the wall push and permanently stabilize the wall from further movement.

Carbon Fibre can be used to stabilize a wall in place or the wall can be excavated, pushed back into place, and then stabilized with carbon/Kevlar straps

Placement of Carbon/Kevlar straps

a. Placement of Carbon/Kevlar straps is marked using a piece of chalk or pencil

A dustless grinder is used to grind down the block
b. A dustless grinder is used to grind down the block in the area of install to reach the aggregate (stone) within the block. This is important since the weakest part of this system is the foundation wall.

Fortress hardened epoxy is then applied to the wall

c. Fortress hardened epoxy is then applied to the wall or the strap to form an epoxy bed.

Protective backing is peeled from the back of the strap

d. Protective backing is peeled from the back of the strap, and strap is placed in the epoxy bed on the wall

The strap is pushed into the epoxy bed
e. The strap is pushed into the epoxy bed and as the epoxy encapsulates the mesh strap, small epoxy rivets are formed creating a bond between the strap and the wall that is stronger than the wall itself.

The installation is complete

f. The installation is complete after the strap is fully encapsulated in the hardened epoxy.




Before Bowed Wall Repair

BEFORE...


After Bowed Wall Repair

AFTER...

Before and after walls are now ready for paint!

Pros.

  • The strength of the Carbon Fibre exceeds the strength of the concrete block. In other words, the strap will never break and is warranted for the life of the structure

  • Life of the structure warranty

  • Carbon Fibre is insert and will not corrode or react with the concrete block, ever

  • Straps are only 1/8" thick and therefore can be painted over to make the straps "disappear" into the foundation wall

  • The straps are "low profile" and therefore not scary to a new home buyer, especially if they have been painted over

  • Carbon fibre is not a conductor and therefore do not represent a problem with respect to thermal bridging or ghosting

  • Straps don't intrude into the basement living space or decrease the basement living space

  • Stud walls can be constructed directly over the straps and straps will not obstruct the stud wall construction at all

  • Bow-ties(link) can be used to anchor the foundation wall to the header, thereby making additional bracing in older homes unnecessary.

  • Can be used even if the top of the foundation wall has separated from the sill plate by using Bow-ties(link)

Cons.

  • Can not be used if the concrete block is disintegrating

  • Can not be used as a "stand alone" in the presence of an "off-set". Additional bracing of the off set is needed (core fill and pin)

  • This repair is structural only and does not address any basement leaking issues that may be present

2. Complete Re-build...If you need it, you need it!

Sometimes, it is more cost effective to simply excavate and rebuild the entire foundation wall. If there are numerous off sets, blocks are pushing in all over the place, and/or the blocks are simply disintegrating, the wall needs to be rebuilt.

a. Foundation wall is excavated from the exterior and all finishing’s are removed from the interior

b. Weight of house is transferred to temporary beams, and jack posts

c. Old concrete block is knocked out and new concrete block is installed

d. Weight of house is lowered back into place and temporary support is removed

Pros.

  • Combines exterior waterproofing with the structural repair and addresses any basement leaking issues at the same time

  • There are no straps or I-beams visible on the foundation wall following the repair (unless the design load of the wall needed to be increased in addition to the rebuild)

Cons.

  • The forces that pushed the wall in, in the first place may still be present. Additional work to either reduce the exterior load or increase the design load of the wall may be necessary.

  • Very expensive

  • Very intrusive to both exterior landscaping and interior finishings

  • Some cracks may be created in the plaster or drywall in the upper floors due to the lift and may need to be taped and re-plastered following work

Please contact us for more details »»


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