Underpinning – GJ MacRae Foundation Repair

Structural Underpinning and Basement Waterproofing (Brampton)

gjmacrae — Fri, 14 Jun 2024 04:41:01 +0000

Repair all cracks and masonry voids in foundation wall below grade. Once cured, apply AB-720-38 rubberized membrane to repair area. Add a layer of mastic mesh, another layer of AB-720-38 rubberized membrane, a layer of 12m plastic and fasten drainage board to grade with termination straps and concrete anchors.

Replace weeping tile system within repair areas and cover with 6″ of 3/4″ clear gravel. Backfill and power tamp dirt.

Structural Underpinning and Footing Install (Mississauga)

gjmacrae — Fri, 14 Jun 2024 04:07:21 +0000

Form up proposed concrete footing and fill forms with 25 MPa concrete until full and install needle vibrator. Once cured, remove timber forms.

Structural Underpinning and Basement Waterproofing (Toronto)

gjmacrae — Fri, 14 Jun 2024 03:28:30 +0000

Saw cut asphalt and excavate to footing. Excavate underpin by hand and clean underside of footing with wire brush. Apply masonry adhesive to underside of footing. Once underpin is carved and prepared, build and install timber forms to accommodate a positive concrete adhesion to the underside of existing footings (non-grout, overflow method) allowing for a void-less encapsulation of existing structure to fresh underpin. Fill forms with 25 MPa concrete until full and install needle vibrator. Once cured, remove timber forms.

Replace weeping tile system within repair areas and cover with 6″ of 3/4″ clear gravel. Backfill and power tamp dirt.

Structural Foundation Underpinning and Carbon Fiber Install (Oakville)

gjmacrae — Fri, 14 Jun 2024 03:18:54 +0000

Excavate complete foundation by hand and clean underside of footing with wire brush. Apply masonry adhesive to underside of footing. Once underpin is carved and prepared, build and install timber forms to accommodate a positive concrete adhesion to the underside of existing footings (non-grout, overflow method) allowing for a void-less encapsulation of existing structure to fresh underpin. Fill forms with 25 MPa concrete until full and install needle vibrator.

Once cured, remove timber forms. Repair all cracks and masonry voids in foundation wall below grade. Once cured, apply AB-720-38 rubberized membrane to repair area. Add a layer of mastic mesh, another layer of AB-720-38 rubberized membrane, a layer of 12m plastic and fasten drainage board to grade with termination straps and concrete anchors.

Replace weeping tile system within repair areas and cover with 6″ of 3/4″ clear gravel. Backfill and power tamp dirt.

Remove and dump all debris. All labour and materials included.

Basement Entrance Replacement in the Junction (Toronto)

gjmacrae — Fri, 14 Jun 2024 02:40:30 +0000

Fully demolish existing basement entrance and walls and dispose (complete removal/replacement of all basement entrance walls). Dig down to footings of structure by hand and install three underpins to engineer specified dimensions. Once cured, install telescopic jack to secure the above concrete pad and install 6” of 3/4“ gravel base throughout the excavation. Install 4” of styrofoam SM insulation and 15M rebar in mesh link pattern as to engineer specifications. Install concrete footing and float.

Once cured, begin reconstruction of complete basement entrance walls with 10“ cinderblock, blok-lock and 15M vertical rebar installations in specified block cores. Fill specified cores of blockwork with grout and parge exterior of fresh blockwork. Once wall rebuild is completed and cured, prime and waterproof exterior blockwork. Fasten drainage board to fresh blockwork and fasten styrofoam SM to exterior walls. Backfill soil on exterior of fresh block walls and form up new staircase with timber and appropriate rebar detail. Once prepared, pour new staircase and float.

Once complete, remove timber formwork and dispose. Remove existing concrete floor in cold room and pour new. Backfill all exterior walls and remove all debris. Refasten fence and secure. All labour and materials included.

Basement Underpinning with HSS Post Installations (Burlington)

gjmacrae — Wed, 12 Jun 2024 17:02:27 +0000

Begin underpinning sections around complete perimeter of interior foundation walls in increments. Excavate underpins by hand and clean underside of footing with wire brush. Apply masonry adhesive to underside of footings. Once underpins are prepared, build and install timber forms. Forms shall accommodate positive concrete adhesion to underside of existing footings (overflow method) and allow for a void less encapsulation of existing structure to fresh underpins achieving a complete watertight seal (non-grout installation method).

Fill forms with 25 MPa concrete and install needle vibrator. Once primary underpins are completed repeat process around entire interior perimeter, staggered into pre-determined sectionals. Once full interior perimeter detail is complete, inspected and certified, prepare for complete excavation of basement floor by hand. Frame up and fasten existing furnace to joist work.

Fasten timber plankage to interior joist work and install vertical iron shoring along complete length of existing beam. Slowly begin lifting structure off of existing interior load bearing beam and secure the above structural load. Once vertical structure and joist work is secured, remove existing beam/load bearing columns from basement and dispose.

Install fresh vertical iron posts and plates where applicable and pour specified concrete footings for posts. Fasten new vertical posts to existing wood beam with approved hardware. Once post footings are cured, remove shoring and rest structure onto new post/footings installations.

Begin underpinning excavation of debris through side access window directly to disposal bin. Once full excavation of underpinned sectionals has concluded, remove timber forms and install a complete 4” interior weeping tile system with filter cloth. Chip all loose debris from foundation walls and repair all masonry voids in existing foundation walls with S-type masonry. Once cured, fasten drainage board around complete interior perimeter from grade to base of fresh underpins.

Install sump box next to proposed services area (customer to determine preferred sump box location). Connect fresh 4“ weeping tile system into proposed sump box and install a 1/3hp cast iron oil cooled sump pump with check valve into sump basin. Install 8” of 3/4” clear gravel throughout entire basement floor. Once level and complete, proposed plumbing rough-in modifications are to take place (not included in below price).

Once full structural and plumbing inspections are completed, install a 4” concrete floor by hand and float level. Remove and dump all debris. All labour and materials included.

Basement Underpinning with HSS and Footing Installation (Hamilton)

gjmacrae — Wed, 12 Jun 2024 16:31:19 +0000

Begin initial underpinning sections around complete perimeter of interior foundation walls in increments. Excavate underpins by hand and clean underside of footing with wire brush. Apply masonry adhesive to underside of footings. Once underpins are prepared, build and install timber forms. Forms shall accommodate positive concrete adhesion to underside of existing footings (overflow method) and allow for a void less encapsulation of existing structure to fresh underpins achieving a complete watertight seal (non-grout installation method).

Fill forms with 25 MPa concrete and install needle vibrator. Once primary underpins are completed repeat process around entire interior perimeter, staggered into pre-determined sectionals. Once full interior perimeter detail is complete, inspected and certified, prepare for complete excavation of basement floor by hand. Frame up and fasten existing furnace to joistwork. Begin excavation of debris through side access window directly to disposal bin. Once full excavation of underpinned sectionals has concluded, remove timber forms and install a complete 4” interior weeping tile system with filtercloth. Chip all loose debris from foundation walls and repair all masonry voids in existing foundation walls with S-type masonry. Once cured, fasten drainage board around complete interior perimeter from grade to base of fresh underpins.

Install sump box next to proposed services area and connect fresh 4“ weeping tile system into proposed sump box and install a 1/3hp cast iron oil cooled sump pump with check valve into sump basin. Install 8” of 3/4” clear gravel throughout entire basement floor. Once level and complete, proposed plumbing rough-in modifications are to take place (not included in below price).

Remove all debris or obstructions in way of existing beam access. Fasten timber plankage to interior joist work and install vertical iron shoring along complete length of existing beam/load bearing wall. Slowly begin lifting structure off of existing interior load bearing wall and secure the above structural load.

Once vertical structure and joist work is secured, remove existing beam/load bearing columns from basement and dispose. Install fresh vertical iron post and plates where applicable and pour specified concrete footings for post and load bearing walls. Fasten new vertical post to with approved hardware. Once full structural and plumbing inspections are completed, install a 4” concrete floor by hand and float level. Once post footings are cured, remove shoring and rest structure onto new post/footings installations. Remove and dump all debris.

Interior Underpinning and Foundation Reinforcement (Hamilton)

gjmacrae — Wed, 12 Jun 2024 16:25:08 +0000

Excavate underpin by hand and clean underside of footing with wire brush. Apply masonry adhesive to underside of footing. Once underpin is carved and prepared, build and install timber forms to accommodate a positive concrete adhesion to the underside of existing footings (non-grout, overflow method) allowing for a void less encapsulation of existing structure to fresh underpin. Fill forms with 25 MPa concrete until full and install needle vibrator. Once cured, remove timber forms. Repeat process for second underpin.

Establish location of footing and mark out on floor. Excavate to required depth. Establish soil strength, install rebar grid. Cast in place using 25 MPa concrete at minimum strength. Vibrate concrete to top of form and float to glass finish. After 48 hours, return to remove forms. Dispose of all debris.

All work(s) to be completed to engineering specifications.

Basement Foundation Replacement and Reinforcement (Hamilton)

gjmacrae — Wed, 12 Jun 2024 16:11:44 +0000

Remove all existing materials from basement for clear access to foundation walls. Remove side window frame for outward materials access. Remove existing basement staircase and store away from repair areas. Install telescopic shoring in areas of foundation wall replacement and vertically secure above joist work and sill plate. Once the above structure is secured, excavate damaged foundation walls to their footings from the exterior, by hand. Once damaged walls are exposed remove and dispose. Excavate new foundation wall footings to engineer specified dimensions and cast new concrete footings. Once footings are cured, rebuild new foundation wall with cinderblock, 15M rebar and bond bars. Once complete, waterproof exterior of fresh block work and fasten drainage board to fresh foundation walls. Backfill and tamp dirt and grade exterior excavation with 3/4″ gravel.

On interior of basement shore up existing timber support beams and secure above structure. Remove and dispose the existing brick columns and steel posts. Install x4 fresh concrete footings at dimensions 30″ x 30″ x 14″ and install custom fabricated vertical steel posts and fasten new steel posts to timber beam with approved hardware. Once footings are cured, remove shoring and rest structure back onto fresh steel posts. Install two small steel posts in staircase area and fasten HSS to engineer specifications. Remove and dispose existing concrete knee wall and begin initial underpinning sections around complete perimeter of interior foundation walls in increments and to engineering specifications. Excavate underpins by hand and clean underside of footings with wire brush. Apply masonry adhesive to underside of footings. Once underpins are prepared, build and install timber forms.

Forms shall accommodate positive concrete adhesion to underside of existing footings (overflow method) and allow for a void less encapsulation of existing structure to fresh underpins (non-grout installation method). Fill forms with 25 MPa concrete and install needle vibrator. Install specified vertical rebar segments into fresh underpins and let cure. Once primary underpins are completed, repeat process around entire interior perimeter and stagger into pre-determined sectionals. Once full interior perimeter detail is complete, inspected and certified, begin the construction of 6″ ledge timber formworks in front of the complete perimeter of interior foundation walls and tie ledge formworks into previously cured underpinning rebar lengths. Once complete perimeter of basement walls are formed and prepared, fill ledge forms with 32MPa concrete and vibrate with needle vibrator. Float top of forms level.

Once cured, remove all formworks. Trench around interior footprint of foundation walls and install a 4″ perforated weeping tile system around complete interior perimeter. Install a fresh sump basin at dimensions 2.5ft x 2.5ft x 3ft and line perimeter of basin with filter cloth. Surround basin with 3/4″ gravel and connect fresh weeping tile system into basin. Install a 1/3hp sump pump and connect into existing plumbing. Fasten drainage board to fresh foundation walls with concrete anchors around complete interior perimeter. Excavate existing cast iron/clay plumbing tree below existing floor and fully rebuild with PVC.

Backfill soil, grade level and install 3/4″ gravel throughout interior perimeter of trenches. Remove all excavated soil from underpinning installations to disposal bins VIA conveyor belt. Reinstall concrete floor in specified areas.

Ultra-Deep Underpinning and IBEAM Replacement in Leslieville (Toronto)

gjmacrae — Wed, 12 Jun 2024 15:48:39 +0000

Remove all debris from repair area. Remove front window and frame new opening with timber for clear outward access. In front yard, remove all shrubbery and materials in way of material access window. Once prepared, fasten timber plankage to existing joist work and install vertical iron shoring along complete length of existing timber beams.

Slowly begin lifting structure off existing timber beams and posts and secure load to iron shoring. Once vertical structure is secured, remove existing timber beams and columns from basement. Install fresh iron IBEAMS into place (W8x40). Install fresh vertical 4” iron post and plate where beams connect and install a 24“ x 24” x 12“ concrete footing at final floor depth. Fasten new vertical posts to fresh IBEAM installation with approved hardware and pocket fresh iron IBEAMS into opposing foundation walls. Once post footing and IBEAM pockets are cured, remove shoring and remove all debris from basement.

Begin initial underpinning sections around complete perimeter of interior foundation walls. Excavate underpins by hand and clean underside of footing with wire brush once exposed. Apply masonry adhesive to underside of footing and fasten rebar into forms. Once pins are prepared, build and install timber forms. Forms shall accomidate positive concrete adhesion to underside of existing foundation walls/footings and allow for a voidless encapsulation (or overflow) of existing structure to fresh underpins to achieve a complete watertight seal.

Fill forms with 25 mPa concrete and vibrate with needle vibrator. Once primary underpins are completed, repeat process around entire interior perimeter, staggered into pre-determined sectionals. Shore up existing furnace and install final underpins behind services. Once full interior perimeter underpinning detail is complete, inspected and certified, remove all debris and prepare for complete hand excavation of complete basement floor.

Begin hand excavation through conveyor belt to disposal bin on front lawn. Once full hand excavation of underpinned sectionals is complete, install a full 4” interior waterproofing system with weeping tile and filter cloth. Fasten Platon drainage board around complete interior perimeter from exterior grade to bottom of fresh underpins. Install sump box next to services area (customer to determine preferred sump box location). Connect fresh 4“ weeping tile system into proposed sump box and install a 1/3hp cast iron oil cooled sump pump with check valve into sump basin. Install 8” of ¾” clear gravel onto entire basement floor. Once levelled and complete, proposed plumbing modifications are to take place.

Once full structural and plumbing inspections are completed, install a 4” concrete floor by hand and float to a glass finish.