When concrete needs to flex instead of crack, or a leak has to stop without excavation, Sika is the chemistry we reach for. We install the full Sika line, waterproofing membranes, polyurethane injection, repair mortars and floor topcoats, following the manufacturer sequence and spec so the warranty stays intact and the job actually holds.
Where Sika Concrete Stops Leaks and Restores Damage
Concrete moves. Temperature swings, freeze-thaw cycles, and ground settlement all cause the slab and walls to shift. A rigid waterproofing coating cracks when the concrete moves, and water finds the gap. Sika waterproofing systems (Sikalastic, Sikagard) use elastomeric chemistry that flexes with the movement, so the seal stays intact.
When a crack is already leaking, Sika crack injection with SikaFix HH polyurethane fills the crack from the inside, stopping the water without digging up the exterior. The polyurethane expands slightly to fill voids and stabilises the substrate at the same time.
We evaluate whether the issue is preventive waterproofing, an active leak, structural damage, or a finished-floor application, then select the matching Sika product line and chemistry.
Prepare the surface
The concrete is cleaned, routed, and dried to the moisture content the Sika spec requires. Cracks are opened and cleaned if injection is the solution.
Apply primer, body, topcoat
We follow the published Sika sequence, applying each layer at the correct temperature, thickness and cure time. The chemistry is matched to the environment and load.
Document and warranty
The install is photographed, data sheets are provided, and the manufacturer warranty is registered. Any future work can reference the original spec.
Sika below grade
Why Sika Repair Holds Through Freeze-Thaw
Oshawa winters are hard on concrete. Freeze-thaw cycles push water into cracks, and rigid coatings fail because they can't flex with the movement. Sika waterproofing on foundation walls and under-slab applications is elastomeric, so it moves with the concrete instead of cracking off.
Inside the building, Sika crack injection stops active leaks through walls and slabs without excavation. Sika MonoTop repair mortars rebuild structural concrete to the original profile and strength. Together, they are why a Sika install doesn't become a repeat project the next spring thaw.
Which Sika line for which job, injection, waterproofing and warranty in Oshawa.
Often, yes. Sika crack injection with SikaFix HH polyurethane seals active cracks from inside the wall and stops the leak, without needing to excavate the outside of the foundation in most cases.
Sika waterproofing is a system applied to a whole wall or slab to keep water out. Crack injection is a targeted repair that seals a specific crack already letting water through.
Yes, the right one can. Sika MonoTop repair mortars rebuild spalled and structural concrete to original profile and strength, with the chemistry chosen to suit whether the repair is cosmetic or load-bearing.
Because elastomeric chemistry actually flexes with concrete movement. A rigid coating cracks where the substrate moves, and the leak comes back. Sika systems were developed to flex and seal, which is why they hold up below grade.
Yes. We install Sika products as a system, primer, body and topcoat in the published sequence and chemistry. That is what keeps the manufacturer warranty intact and what makes the install actually perform.
Sika crack injection stopped a leak we had chased with caulking for years. They sealed it from inside and the basement has been dry through two springs.
M. E.
Homeowner
★★★★★
Full Sika waterproofing on a new foundation. Elastomeric so it can flex with the concrete and not crack off the way the old rigid coating did.
A. D.
Builder
★★★★★
SikaTop repair on a worn loading-dock area. Profile is exact, took our forklift traffic, and they handed over the data sheets for our records.
J. E.
Commercial property manager
★★★★★
They install Sika as a full system, not just a coat of the product they have on the truck. That difference shows up in how long the install holds.
L. G.
General contractor
From the blog
Concrete Guides & Articles
Practical reading on planning, finishes and caring for concrete in Oshawa.
A leaking foundation, an active crack, structural damage or a concrete floor that needs finishing, tell us what is happening and we will spec the right Sika product line and send a written, itemised quote.
