Question 1

How thick should a garage floor slab be in New Brunswick?

Accepted Answer

A residential garage floor slab in New Brunswick should be a minimum of 4 inches thick, and 5 inches is strongly recommended if you park heavy vehicles, use the space as a workshop, or plan to apply an epoxy or polyaspartic coating. Thicker is better — the cost difference between 4 and 5 inches is modest, but the improvement in durability and resistance to cracking under NB's frost-heave conditions is meaningful.

The NB Building Code doesn't mandate a specific thickness for garage floor slabs t

Question 2

What is the best garage floor coating for NB winters?

Accepted Answer

For New Brunswick garages, a 100% solids polyaspartic coating is the best overall choice, combining durability, chemical resistance, and the ability to handle NB's temperature extremes better than any other coating type. That said, a well-applied 100% solids epoxy system is a close second and costs less — making it the most popular professional choice in NB for homeowners who want excellent performance without the premium price of polyaspartic.

NB winters create a specific set of challenges for

Question 3

Epoxy vs polyaspartic garage floor coating — which is better for NB?

Accepted Answer

For New Brunswick conditions, polyaspartic has technical advantages over epoxy — but a properly installed 100% solids epoxy system is an excellent choice for most NB homeowners and costs 20–40% less. The right answer depends on your garage, your budget, and how the space is used.

Here's an honest side-by-side breakdown for NB conditions:

UV stability: Polyaspartic wins clearly. Standard epoxy yellows when exposed to UV light, which matters if your garage gets sunlight through windows or an ope

Question 4

Can I pour a new concrete floor over my old basement floor in NB?

Accepted Answer

Yes, you can pour a new concrete floor over your old basement floor in New Brunswick — but only if you address any moisture issues first and have adequate headroom to lose 2–4 inches of ceiling height. Skipping the moisture assessment before pouring is the most common mistake, and it results in delamination, efflorescence, and a damp floor that defeats the purpose of the project.

The first question is: why are you replacing the basement floor? If the answer is cracking, unevenness, or age, an o

Question 5

How do I deal with moisture coming through my basement floor in New Brunswick?

Accepted Answer

Moisture coming through a basement floor in New Brunswick is almost always caused by hydrostatic pressure — water in the soil outside and beneath the foundation pushing up through the slab under pressure — and the solution requires addressing the water management system, not just the floor surface. Coating or sealing the floor without fixing the drainage is a temporary measure at best.

NB's climate creates several reasons why basement floor moisture is common. Spring thaw is the biggest one: wh

Question 6

What PSI concrete should be used for a garage floor in NB?

Accepted Answer

A garage floor in New Brunswick should be poured with a minimum 4,000 PSI (30 MPa) concrete mix, and many contractors specify 4,500 PSI (32 MPa) for added durability. Standard 3,500 PSI (25 MPa) concrete is appropriate for many interior applications, but a garage floor sees vehicle traffic, oil and chemical exposure, thermal shock from hot tires, and potentially freeze-thaw cycling near the door — all of which benefit from higher strength concrete.

In Canada, concrete strength is typically spec

Question 7

How long does epoxy garage floor coating last in New Brunswick?

Accepted Answer

A professionally installed 100% solids epoxy garage floor coating in New Brunswick typically lasts 10–20 years with proper maintenance, while DIY water-based epoxy kits from hardware stores typically last 2–5 years before peeling or wearing through. The difference comes down to film thickness, bond strength, and product quality — not just how it's applied.

NB garages are harder on floor coatings than garages in milder climates. The combination of factors that shorten coating lifespan in NB incl

Question 8

Should I put vapour barrier under a basement floor slab in NB?

Accepted Answer

Yes — a vapour barrier under a basement floor slab is strongly recommended in New Brunswick and should be considered standard practice, not an optional upgrade. NB's variable water table, spring thaw conditions, and prevalence of older homes with subgrade moisture issues make below-slab vapour control an important step in any basement floor project.

The purpose of a vapour barrier is to prevent ground moisture from wicking up through the concrete slab by capillary action. Concrete is porous — e

Question 9

How do I level an uneven basement floor in a New Brunswick home?

Accepted Answer

Levelling an uneven basement floor in a New Brunswick home depends on the cause and degree of the unevenness — self-levelling concrete underlayment handles minor irregularities up to about 1.5 inches, while significant settlement or structural heaving requires more involved repair before any floor work. Diagnosing the cause first saves you from investing in a fix that won't last.

Common causes of uneven basement floors in NB homes:

Slab settlement — portions of the floor have sunk due to soil

Question 10

Can I install radiant floor heating in a concrete basement floor in NB?

Accepted Answer

Yes, radiant floor heating works very well in a concrete basement floor in New Brunswick, and concrete is actually the ideal material for a radiant system because its thermal mass stores and releases heat efficiently. NB's cold winters make radiant floor heating particularly effective — a warm floor combats the chill that rises from below-grade spaces even in well-insulated basements.

There are two main types of radiant floor systems installed in NB basement floors:

Hydronic (water-based) radi

Question 11

What gravel base is needed under a garage floor slab in New Brunswick?

Accepted Answer

A garage floor slab in New Brunswick requires a minimum 6-inch compacted granular B gravel base, and 8–12 inches is better in areas with poor drainage, high clay content soil, or elevated water tables. The gravel base is not just a construction step — it's the difference between a garage floor that stays flat for 30 years and one that cracks and heaves within a decade.

NB's frost depth of 4–5 feet means the soil beneath your garage floor freezes and thaws every year. When water-saturated soil f

Question 12

How do I prepare a garage floor for epoxy coating in NB?

Accepted Answer

Properly preparing a garage floor for epoxy coating is 80% of the job — the coating itself goes on quickly, but inadequate surface preparation is the reason most epoxy coatings fail prematurely in NB garages. The concrete must be clean, open-pored, and dry for epoxy to bond reliably through NB's winters.

Step 1: Test for Moisture

Before anything else, test for moisture vapour emission. Tape a 2-foot square of plastic sheeting to the floor with all edges sealed, and leave it for 24–48 hours. C

Garage & Basement Floors