Maximum Floor Slope

The building code requires that a garage floor be sloped towards the door but does not specify a minimum slope.

Maximum floor slope.

Shower floor slope to efficiently drain the recommended minimum slope for a shower floor is about 4 percent or a 1 2 inch drop per every 12 inches from the shower walls to the drain. Floor slopes shall be reasonably uniform and comply with 5 6 1 through 5 6 3. Your figure of 1 4 per foot doesn t sound bad. Here is the citation from the international residential code irc.

A 2 slope will probably ensure better drainage we could also find no slope tolerance for use when a floor slope is specified. I d slope it as much as you can stand. It stands to reason that the steeper the slope then the more likely you are to slip on that slope yet one of the biggest mistakes we see is a lack of understanding that a slope on a floor requires an increase in the slip resistance value srv also know as the pendulum test value ptv. Floor testing testing on slopes.

But they got one low spot right where i got out of my car. Another consideration regardless of the amount of slope is whether there is structural damage in the home or only cosmetic damage. Floors that slope 2 or 3 inches in 20 feet would be a very serious concern. It is usually 1 8 to 1 4 per foot.

Nearly all will say that if a floor slopes 1 and 1 2 inches in twenty feet or more that there should be further investigation. 5 6 1 the slope of the floor from the shallow end wall towards the deep area shall not exceed 1 foot in 7 feet 30 cm. Aci 117 90 st andard specifications for tolerances for concrete construction and materials gives a level alignment tolerance of 3 4 inch for top of slab elevation of slabs on grade. So during the winter melted snow and rain would puddle there and freeze.