Concrete Spalling Behind Siding

James hardie recommends that a slip sheet joint flashing is installed behind each butt joint in the siding.

Concrete spalling behind siding.

By the diy experts of the family handyman magazine get rid of concrete spalling by resurfacing the concrete if your driveway surface has spalling concrete the most likely cause is an installation mistake. The problem is called concrete spalling and here s how to fix it without replacing the entire driveway. 5 contractors might make the mistake of adding too much water but frankly most don t make mixing errors. Concrete spalling commonly known as concrete cancer is an eye sore and has the potential to be an extreme hazard.

This is a 6 wide piece of weather resistive material to make sure that no water gets through. Editorial advisor mike guertin replies. You are right to be concerned about placing the new concrete step in direct contact with the fiber cement trim or most siding and trim materials for that matter. The siding on this gothic revival style home looks like wood clapboard but it s actually fiber cement painted a custom color.

What causes spalling and how to prevent it. Hardieplank lap exterior siding is engineered for climate and designed to hold up to the changing weather conditions in the environment where it is installed. Spalling tends to be most common in cold climates when de icing chemicals are applied or when seasonal freeze thaw cycles damage the concrete. Concrete absorbs and holds water and most siding and trim materials including fiber cement aren t rated for contact with concrete.

Causes of concrete spalling corrosion of embedded reinforcing steel because the corrosion products rust occupy more volume than the original steel and the resultant pressure spalls the concrete. 7 inch wide smooth lap siding primed about 1 50 per square foot picking the right siding for your house is a delicate balancing act between good looks durability maintenance and affordability. Fire exposure due to which free water in concrete change to stem and create internal expansive pressure in concrete consequently spall off concrete. Over the course of a winter or over the course of years as the internal pressure rises and falls it stresses the surface layer of the concrete which leads to spalling.

Spalling that occurs in a concrete driveway or sidewalk typically happens because the weather changed during the hardening process or something else occurred to prevent the concrete from finishing its curing. Spalling of concrete slab due to corrosion left untreated and exposed to the elements will cause extensive structural damage and may cause it to break away from the façade potentially injuring the public and damaging property.