Tag Archives: Concrete

HVAC Slab Ductwork Seal & Concrete

First, use expanding foam to fill the ductwork below the floor at each register. Just foam block the area near the floor hole with foam. Then mix up some pre-mix concrete and dump it into the hole in the floor into the ductwork. Fill the duct register hole with the concrete and let it dry. […]


Concrete Spotty Patches & Sealers

Curing happens unevenly in concrete, with parts of the concrete losing or curing faster than others. This leaves different color or darker patches in it. The good news is the bad news: the sealer wisely applied to your concrete also holds in the moisture for a longer period of time. I suspect that these spots […]


Foundation Concrete Cracked Brick Corner

The cause of the crack is expansion of the brick usually from sunlight or summer heat. The brick is usually a different color than the white concrete foundation and therefore expands and contracts at a different rate than the concrete. During the heat of the summer the brick “slides” or elongates more than the concrete […]


Ice Melt for Concrete Driveway

The poch marks are likely from rock salt deterioration on your concrete drive. It can be caused by using rock salt to melt ice on your drive or can be brought onto your drive by parking vehicles on your drive that drive on public roads. The road crews typically and economically treat our roads and […]


Saw-Cutting Foundation for a Door & Window

Whoa there! This is a big league structural issue when you start sawing structural concrete like a foundation. The good news is it can be done, the bad news is that it takes the help of a structural engineer and a building permit is required. You need the engineer to assess the structural loads, opening […]


Filling a Hole Under a Concrete Patio

Use the old soil, put it loosely in the hole and ram compact it with the end of a 2×4. This allows the soil to be compacted through the hole with an inexpensive tool. The end of the 2×4 can really pack the soil. If you have difficulty ramming the 2×4, use a sledge hammer […]


Concrete Slab with Fiber Mesh or Wire Mesh Reinforcement

I advise welded wire fabric (6x6x10x10 mesh – 6″x6″ pattern with #10 gauge wire both directions), low slump concrete which means poured pretty dry (not a lot of water mixed in), 3,000 psi concrete, air entrained (little air bubbles in the cured concrete allowing water freeze expansion to fill the air bubbles instead of expanding […]


Concrete Floor Cracks in Basement

Your concrete floor is probably fine. Hundreds of gallons of water leave your floor concrete over the first year and this causes shrinkage. This shrinkage commonly shows as a fine crack, which is typically an even width along the crack. Some builders design shrinkage joints or control joints in basement floors which show up as […]


Concrete Foundation Expands and Contracts

Concrete most definitely moves during expansion and contraction. Just look at our highways with expansion joints between the concrete slabs. These joints get compressed during the hot summer when direct sunlight causes heat and tremendous expansion, and then in the cold winter months the slabs shrink to smaller sizes and the joints widen. I have […]


Removing Paint from Concrete

Yes, the paint can be stripped from the concrete, but it is usually a messy, tedious task with no real guarantee that the concrete will return 100% to its original appearance. The removal process entails application of chemical strippers to the surface and then scraping it off. Other options for changing the appearance of your […]