Loading...
Serving San Rafael, CA and surrounding areas(628) 234-2248
San Rafael's older building stock and strict stormwater rules make concrete cutting a job where scanning first and containing slurry after are not optional steps. We bring the right method, the right documentation, and the right safety controls to every cut.
Concrete cutting in San Rafael uses diamond-segment blades and drill bits to make precise cuts through slabs, walls, and foundations — most residential core drilling and slab sawing jobs are completed in a single day, while larger structural modification cuts for seismic retrofits or ADU conversions may run two to three days including site setup and slurry management.
The distinction that matters most in San Rafael is what is inside the concrete before the blade touches it. Marin County's mixed building stock — mid-century commercial concrete, post-tension residential slabs from the 1970s and 1980s, and unreinforced masonry in downtown buildings — means the rebar layout, cable placement, and aggregate hardness can vary dramatically from one property to the next. Cutting blind into a post-tension slab severs cables that are under thousands of pounds of tension; the snap-back is violent and the repair is expensive. Ground-penetrating radar scanning takes 30 to 60 minutes and catches what cannot be seen.
San Rafael's seismic environment also shapes the work. The city sits near the San Andreas and Hayward fault systems, and much of the structural concrete cutting performed here is part of seismic retrofit scopes — opening walls for new shear panels, creating penetrations for hold-down hardware, or sawing slabs to reconfigure drain lines during a garage-to-living-space conversion. These cuts require temporary shoring before load-bearing sections are removed and careful sequencing reviewed by the project structural engineer. Projects in this category connect directly to downstream work like concrete floor installation once the structural work is complete.
New drain lines for a kitchen relocation, bathroom addition, or ADU require openings through the existing concrete slab. In many San Rafael homes built from the late 1960s onward, that slab may contain post-tension cables not shown on any surviving drawing. Core drilling or slab sawing without a prior GPR scan creates a real risk of severing one — a repair that costs far more than the scan.
Garage-to-living-space conversions and new door or window openings in reinforced-concrete walls require precise wall saw cuts. The opening must be sequenced correctly — temporary shoring installed before the cut, not after — and the cut depth must match what the structural engineer specified. Wall sawing in San Rafael's downtown buildings and older commercial structures calls for track setup and blade selection matched to the specific aggregate and PSI of the material.
Soft-story retrofit work and cripple wall bracing projects in San Rafael regularly require core drilling through existing concrete for new anchor hardware, coupler sleeves, and utility lines added as part of the retrofit. Coordinating the cut sequence with the structural engineer ensures no load path is disrupted before shoring is in place — a step that gets skipped when a general contractor uses a crew unfamiliar with retrofit sequencing.
Removing a damaged section of concrete driveway, garage floor, or patio without disturbing adjacent slabs requires slab sawing along a clean control line. Hydraulic breaking without a saw cut first creates unpredictable crack propagation that can extend the removal area significantly — and leaves a ragged joint edge that concrete replacement cannot bond to cleanly.
Before any blade is set up, we review the project scope against the building's age, construction type, and available documentation. On any structure built after 1960 in San Rafael — residential or commercial — we confirm whether a GPR scan is warranted. For post-tension slabs, it is not optional: we scan first, mark cable locations on the surface, and plan cut lines that avoid them. The scan record stays on file as part of the project documentation.
Slab sawing is performed with walk-behind and ride-on flat saws for horizontal surfaces: driveways, garage floors, patios, and interior slabs. Cut depth ranges from a shallow control joint at one-quarter of the slab thickness to full-depth removal cuts. We use wet cutting as the default method — water cooling the diamond blade, extending blade life, and suppressing silica dust at the source. On-site slurry containment using portable berms and wet vacuums keeps concrete paste out of curb drains and storm inlets, which is a specific regulatory requirement under the San Francisco Bay Regional Water Quality Control Board's stormwater permit program. Discharge into the storm system carries fines, and under Marin County's stormwater rules, property owners can be named in a violation even when a contractor made the discharge.
Wall sawing uses a track-mounted circular saw system for cuts through vertical and sloped concrete — new openings, window enlargements, mechanical penetrations, and structural modification work in both residential and commercial buildings. The track is fixed directly to the surface, which provides the precision and stability that hand-held cutting cannot match on deep reinforced walls. For structures in San Rafael's downtown core where adjacent occupants and historic masonry are close, we prioritize wall sawing and wire sawing over hydraulic breaking to minimize transmitted vibration.
Core drilling produces clean, circular bore holes from under one inch to over 24 inches in diameter, at any angle including horizontal and pitched for drain lines. This is the standard method for plumbing stacks, conduit sleeves, irrigation pass-throughs, and post-tension cable access points. Core drill schedules for ADU projects in San Rafael often combine 10 to 20 bore holes of varying diameter across the same slab or wall — something that benefits from a sequenced cut plan rather than booking holes individually. That slab work feeds directly into concrete driveway building or concrete floor installation once openings are made and utility rough-in is complete.
Walk-behind and ride-on flat saws for horizontal cuts in floors, driveways, and patios — including full-depth removal and control joint creation in new pours.
Track-mounted circular saw for precise vertical and overhead cuts through reinforced-concrete walls, ceilings, and sloped surfaces in structural modification work.
Diamond-tipped cylindrical drill bits producing clean circular bores from under one inch to over 24 inches — used for plumbing, conduit, and utility penetrations at any angle.
Diamond-embedded wire loop for large or heavily reinforced sections inaccessible to circular blades — preferred in seismically sensitive or occupied settings for its low vibration output.
Three local conditions shape how concrete cutting is done here in ways a contractor from outside Marin County would not automatically anticipate. First, San Rafael's sustained ADU and soft-story retrofit activity — driven by California's ADU-permissive legislation and the city's active seismic retrofit program — means a high percentage of cutting jobs occur in partially occupied residential structures where vibration, dust, and water management directly affect the people living there. Dry cutting without HEPA vacuum shrouding is not appropriate in occupied spaces; wet cutting without slurry capture is not appropriate on any San Rafael site that drains to the street.
Second, the building stock. San Rafael's downtown and surrounding neighborhoods contain mid-century concrete commercial buildings and 1960s-to-1980s residential slabs where cable and conduit placement records are frequently missing. The American Concrete Institute standards that govern saw-cut joint design and slab construction (ACI 302.1R and ACI 360R) were not applied consistently in construction from that era, meaning aggregate type, concrete PSI, and reinforcement depth vary more than on newer work.
Third, the regulatory environment. The OSHA crystalline silica standard (29 CFR 1926.1153) requires documented exposure controls on cutting jobs, and Cal/OSHA enforces those requirements at a state level. We serve property owners and general contractors in San Rafael and neighboring Mill Valley and Larkspur who want documented proof of compliance — not just a crew that shows up with a saw.
Call or submit the form and we respond within one business day. We ask about the structure type, the concrete age, the scope of cuts needed, and whether permit requirements apply — so the site visit is productive from the start.
We evaluate the site, confirm access for equipment, and determine whether GPR scanning is warranted. For any post-1960 structure or any slab where cable drawings are unavailable, we recommend scanning before quoting final cut placement. This assessment visit produces the cut plan and itemized estimate.
For structural modifications requiring a San Rafael Building Division permit, we prepare the documentation package and submit through the city's OpenGov portal. Most residential cutting jobs not involving structural modification proceed directly to scheduling. Day-of setup includes slurry containment, dust control, and blade selection matched to the material.
Slurry is vacuumed, contained, and disposed of as construction debris — not discharged to the street. We provide cut-as-built sketches and GPR scan records on request. For permitted work, we coordinate the required city inspection before the scope is considered closed.
We assess structure type, confirm whether GPR scanning applies, and provide an itemized estimate before any work is scheduled. Response within one business day.
(628) 234-2248On any San Rafael structure built after 1960, we confirm whether post-tension cables or embedded conduit are present before blade setup. Severing a post-tension cable requires cutting a wide repair trench, installing new cable, and restressing — a repair that routinely costs more than the original project. The scan prevents it.
California's CSLB C-8 Concrete Contractor classification covers concrete cutting work, and Cal/OSHA requires a written exposure control plan for crystalline silica on most cutting jobs. We carry both and can produce the silica plan on request — a requirement that HOAs, general contractors, and San Rafael Building Division inspectors may ask for.
The San Francisco Bay Regional Water Quality Control Board prohibits concrete slurry discharge into storm drains throughout the Bay watershed. Every wet-cutting job we run in San Rafael includes on-site portable containment berms and vacuum recovery — keeping your property in compliance and your contractor relationship clean.
San Rafael's ADU boom and ongoing soft-story retrofit program have produced a steady stream of multi-method cutting jobs — combining core drilling, slab sawing, and wall sawing on the same project in occupied homes. Working in those conditions without disrupting occupants requires crew discipline and equipment that is matched to the site, not borrowed from a larger demolition scope.
Each of these points addresses a real failure mode specific to San Rafael's building stock and regulatory environment. Taken together, they describe work that gets done correctly the first time — with no post-tension incidents, no stormwater notices, and no stop-work orders from the Building Division.
ADU rough-ins, garage conversions, seismic retrofits, and selective slab removal all move faster when the cut is scheduled before other trades are waiting on the opening.