ASCE , “Design and Construction of Frost-Protected Shallow The methods in the builders guide are all contained in ASCE 32 and therefore meet the. Find the most up-to-date version of ASCE at Engineering provisions for homes. • / – ASCE standard referenced in IRC and IBC for residential and commercial building applications. Market Acceptance.
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Fernando Pages Ruiz continues his educational series on constructing frost-protected shallow foundations, focusing here on unheated structures. Although neither the International Residential Code IRC nor the International Code Council ICC provides a prescriptive path, design criteria do exist to design frost-protected shallow foundations FPSFs for unheated buildings, including garages and porches attached to heated structures.
The use of FPSFs for unheated buildings provides 32-10 greatest advantages in unheated and semi-heated structures attached to a heated structure, such as an attached garage or front porch, although the IRC specifically disallows this unless designed by a professional engineer in compliance with ASCE The added insulation and excavation required can diminish some of the cost advantages of this approach, but in some climate zones it still makes sense, and builders use it because it provides a more reliable and better insulated base under slabs.
Books & Standards | ASCE
Frost depth varies by ground cover and soil composition. Note how the dotted line, representing frost, varies across the landscape. You will see that humus retains geothermal heat very well, and the frost depth in the humus remains relatively shallow compared to that in the gravel, which allows cold to penetrate and does not retain geothermal heat.
In an unheated building or unheated portion of a heated buildingthe insulation must cover the entire foundation floor area and, depending on the climate zone, extend beyond the perimeter of the building up to 4′.
Additionally, the subsurface fill must allow moisture to drain away from the foundation, because the conditions required to create frost heave include cold, moisture, and frost-susceptible soil.
Books & Standards
Dry gravel, for example, will not heave in frost. So the combination of an insulating blanket with proper sub-grade preparation, which includes no frost-susceptible soils, often conspires to make this technology more expensive than a conventional foundation.
However, when building over very hard, rocky ground, such as that found in areas of 32-001 northeast, or when desiring to maximize insulation or minimize excavation and ground disturbance, this alternative becomes economically viable.
Detail of typical FPSF design for unheated building. Alternate view of unheated building section using FPSF. The insulation chosen for frost protection in unheated buildings must be adequate for subsurface placement, must meet R-value requirements, and, as it will lie under the footings, must also be able to support light structural loads. Guidance for the selection of insulation and fill is provided by ASCE Insulation under stairways and driveways and over utility lines provides a number of cost-effective aasce to prevent frost heave in secondary applications.
Other uses of this geothermal-capture technology include column base footings, utility trenches a potentially money-saving application for sewer and water servicedriveways, patios, and for building projections such as stairways. Employees at Bill Eich Construction Co.
In an unheated building or an unheated portion of a heated buildingthe insulation must cover the entire foundation floor area. Insulation in the photo above covers the entire garage slab surface area, including the area below footings.
Compacted fill not susceptible to frost will cover the insulation, and then technicians will carve trench footings to suport the structure, taking care not to damage the insulation underneath.
As energy savings and the conservation of resources increasingly drive decision-making for homebuilders, frost-protected shallow footings offer a good method for constructing slab-on-grade foundations.
As a builder ascr townhouses, commercial buildings, and the occasional slab-on-grade SOG house in frigid Nebraska, I always thought it silly to dig footings half as deep as a full basement when the point of SOG construction was to spend less on foundations.
A basement seemed the better value, to me, given that ascs token cost savings came with a slab I immediately perked up and listened closely; it sounded like a good cost-saving measure.
Contractor-turned-homebuilder Fernando Pages Ruiz gives hands-on instruction for constructing frost protected shallow foundations. In many areas, frost depth exceeds 42″, resulting in footings far deeper than structurally needed to hold up the building.
Building an Affordable House: A high-value, low-cost approach to building adce Affordable Remodel: How to get custom results on any budget Contact Fernando on facebook or by way of his website buildingaffordable. Slabs for Colder Climates, Part 1: The How and Why of Frost-Protected Shallow Foundations As energy savings and the conservation of resources increasingly drive decision-making for homebuilders, frost-protected shallow footings offer a good method for constructing slab-on-grade foundations.
Installing Frost Protected Shallow Foundations for Heated Buildings Contractor-turned-homebuilder Fernando Pages Ruiz gives hands-on instruction for constructing frost protected shallow foundations. More in this category: