Spray Foam Insulation - Floors Above Garages/Exposed Floors

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Walls     Floors     Ceilings     Basements     Rim Joists     Crawlspaces     Attics     The Farm

When a floor over is poorly air sealed, air can leak through a number of locations, such as the band joists, structural framing, and knee walls. Air leaks can lead to a host of issues, such as cold floors, freezing pipes, and chilled duct runs that prevent the HVAC system from working properly. A poorly sealed floor cavity has a significantly reduced R-value and isn't much better than a floor cavity with no insulation at all. 

Air sealing the floor cavity properly is key.  
At Red River Spray-On we completely seal the floor as well as any penetrations in the floor with 2 pound closed cell spray foam at about 4-5 inches of foam which gives us a complete air and vapour seal and a dramatic cut in heat loss.  

Cold Floors/Rooms Above Garages

The building codes in many areas dictate that these floors should be insulated to R-28.5 (RSI-5.02). But experience tells us that R-28.5 of batt insulation does not ensure a warm floor. In theory, the floor in a properly insulated room should be at room temperature. In practice things are quite different; it is common to find floors that are 10 F (5.5 C) cooler than the room. Why? Because it is virtually impossible to install a fiber batt so that it is in contact with, and stays in contact with, the floor above. It is also impossible to install it accurately around bracing and bridging between joists. Unfortunately, due to voids and air spaces that allow air movement, fibrous materials do not perform to their rated R-value. (R-values are determined under ideal, still laboratory conditions.) Because air gaps usually exist between the floor and insulation there is room for cold air to infiltrate from the exterior. The cold air essentially "short-circuits" the insulation material and renders it  less effective.  

Heated hotboxes   

Some designers and builders have tried to overcome the problem with heated hotbox using a dropped ceiling isolated with a fiber batt. Heated house air is then ducted in to the space created under the floor. While this helps the problem, experience proves it does not solve it. Cold air from the outside still inflitrates and overcomes the warms air from the ducts leaving the hotbox a coldbox. 

Air sealing and insulating with spray foam is the solution

Spray foam insulation expands to fill the tiniest and most awkward spaces and adheres to the floor above. Spray foam also eliminates voids and resulting air movement that have plagued generations of builders and homeowners. Thousands of floors over porches, garages, crawl spaces and cantilevers have been insulated and air sealed with spray foam. Cold floors are simply not an issue any more when insulated with Red River Spray-On's floor spray foam system.

How do we fix the problem 

The first thing we do is remove the drywall and fiberglass from the garage ceiling. Next we have our duct guy remove the ducts for heating the hotbox, with spray foam heating the hotbox is no longer necessary, which will save in energy costs as well. Next we make sure all the ducts to heat the room above and the water lines are on the warm side by covering them with spray foam yet still making them accessible should the need to move or repair them ever arise. After the spray foam is complete we get our drywall guy in to come in and put up all new drywall to finish the space.

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Open Exposed Floors 

Cottage floors have many penetrations and that aren't completely contained within the floor cavity. It's difficult to install an air barrier in a crawlspace without moving these protrusions into the conditioned space. The major side effects of poorly insulating and air sealing at the floor line are cold floors and drafts from infiltration. Other side effects include issues with moisture, radon, condensation, and rusting or corrosion of the mechanicals not including rodent and insect infestation.  

In the winter time, those of us with raised houses suffer from cold, moist wood floors and in the summertime we lose much of our conditioned air through our floors. Applying Spray Foam Insulation to the underside of the floor not only creates an air seal and insulates the floor. It also seals all the cracks and holes where rodents and insects enter our homes. The foam also will protect your wood floors from soil moisture rising from the ground to slowly rot your wood. Installing fiberglass batts under your floors can be a huge mistake because they tend to drop a few inches creating an air gap where moisture can penetrate and wreak havoc on your wood, not to mention creating a more pleasant environment for termites and rodents.

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Mailing Address

305 Poplar Ave
Winnipeg, MB
R2L 0J8

Hwy 212
Cooks Creek MB


Phone: 1.204.800.2070
Fax: 1.204.800.3141

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