What is a Alaskan slab?
Pouring an Alaskan Slab
One type of concrete slab we install a lot is an Alaskan Slab. This type of slab has thickened edges that act like a footing to the edges of the slab foundation. Most of the time the Alaskan slabs we pour are 6″ thick in the middle and 12 to 18 inches thick around the perimeter.
In Alaska, every region has building codes and/or generally accepted design standards that specify the depth of the local frostline. In Fairbanks, the design depth for footings is a minimum of 42 inches below grade.
Do you need a footing for a concrete slab?
The slab is not suitable for the foundation of the building, for that you will either need strip footings around the outside of the building, or individual footings to support the posts that will hold up your building.
How thick should a floating slab be?
Around the edge of the slab, the concrete forms a beam that is perhaps 2 feet deep. The rest of the slab is 4 or 6 inches thick. A 4- or 6-inch layer of gravel lies beneath the slab. A 4-millimeter sheet of plastic lies between the concrete and the gravel to keep moisture out.
Are slab-on-grade floors cold?
Concrete is an excellent thermal conductor, which is another way of saying it’s a poor insulator. Heat flows from hot to cold, so in winter, concrete pulls heat out of the house, making the heating system work harder (and making a slab-on-grade floor uncomfortably cold).
Why are cabins built off the ground?
Crawl spaces also offer the advantage of lifting a house up off the ground to help avoid termite damage. Full-height basement walls are more expensive to build, but do result in a lower level that provides space for storage and utility equipment. It could also potentially be used as living space.
How long do slab foundations last?
A poured concrete slab foundation with a block base can last 100 years or more, more than a lifetime, if properly designed. Slab foundation termite testing will last 12 years as long as the chemical barriers remain intact.
Is it better to build on a slab or crawlspace?
Crawl space foundations are better suited to dry climates.
Being constructed from solid concrete, slab foundations are impervious to moisture. … Vapor barriers make slab foundations a better option in damp climates where the ground is often saturated. The exception is if the house lies in a flood plain.
How deep are foundations in Alaska?
1808.7 – Foundations on or adjacent to slopes. 23.15. 1809.5 – Frost protection.
|Foundation Type||Minimum Footing Depth (inches) 6|
|Warm Foundation||Cold Foundation 3,4|
|Interior continuous or isolated spread footing 2||8||60|
|Cast-in-place concrete pier||42||120 5|
|Exterior isolated foundation||N/A||120 5|