![]() * The heat loss through an uninsulated floor away from the building perimeter remains constant.The heat loss through the insulated floor was about 70% of that through the uninsulated floor.was obtained by a floor construction in which a two-inch thickness of rigid waterproof insulation extended six inches down parallel to the exposed edge of the floor and back from the exposed edge. The best overall slab on grade performance ".The rate of heat loss from a building varies by the temperature differences between the heated and un-heated space - the colder climate and frozen ground gave more rapid heat transfer, colder in-building floor temperatures, and thus provided an opportunity to test and measure different floor slab and foundation perimeter insulation schemes.This research on floor slab heat loss rates confirmed that Photo: the radiant heat system that we had to abandon because of improper radiant heat tubing placement (too deep) and improper insulation below the slab (incomplete) includes the Thermolec B10-U electric boiler capable of providing 34,120 BTUH, circulator pumps, expansion tank, and radiant heat controls shown here as well as the entire tubing system. The 1948 heat loss research was important in part because it recognized that the rate of heat transfer from the heated building to the outside (earth and surrounding air) would be greater in proportion to the temperature difference between the heated space and the surrounding soils. for more than three successive days), they recognized the need to test slab-on-grade floors in still colder conditions - in a climate where the ground is frozen during much of the heating season. referred to that work, but because the original testing was in warmer conditions (outside temperature had not been below 35☏. Previously, the US National Bureau of Standards had already indicated that the heat loss of a concrete slab (floor) on grade (on the ground) is proportional to the perimeter of the building.īareither et als. The nonsensical view that one can heat up the soil below an building slab on grade and that the soil would magically stay warm forever was put to the test experts when the author was five years old and the contractor was not even a gleam in his daddy's eye.ĭuring February and March 1948, using a specially built, instrumented structure, Harlan Bareither and other experts and students at the University of Illinois Department of Mechanical Engineering conducted careful tests of various slab on grade floor and insulation designs to map heat loss, temperature, and moisture permeation characteristics of nine types of concrete slab subfloor constructions laid on the ground. Original Research Identified Heat Loss Rates Through a Concrete Slab on Grade with Various Insulation Schemes WHY A BAD RADIANT HEAT SLAB SYSTEM DOESN'T WORK.SUCCESSFUL RADIANT HEAT SLAB DESIGN SOURCES.GAPS in RADIANT HEATED WOOD FLOORS - separate article, gaps caused by running the radiant heat at too-high a temperature.DIAGNOSE RADIANT HEAT FLOOR NOT WORKING.CRITICAL DESIGN DETAILS for RADIANT HEAT FLOORS.CODE SPECIFICATIONS for RADIANT HEAT SLABS.Building floor slab insulation design advice. How to place radiant heat tubing at the proper depth in a concrete slab. How our contractor ruined the installation our radiant slab heating system, causing its abandonment. How to avoid some really bad mistakes when installing radiant heat in a concrete floor slab. He was dead wrong - a SNAFU that led to complete abandonment of the heating system he installed. Our contractor (Nightmare-works Construction), didn't want to insulate below the radiant-heat floor slab at all, insisting that "Once you get that dirt heated up below your floor your the earth will stay warm and your home will cost almost nothing to heat." How to Really Foul Up a Radiant Heat Concrete Floor Installation - Mistakes to Avoid, Diagnosing & Fixing Radiant Heat Slabs We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. The result: the owners ultimately had to abandon the entire radiant heated floor system. Prepared the forms and under-slab insulation placed radiant heat floor tubing too deep in the slab and he omitted proper under-slab insulation. The workers in the photograph at page top, where our concrete slab was being poured, were not guilty of a thing. This article explains how to avoid some fatal mistakes when installing radiant heat in a concrete floor slabīy describing an incompetent radiant heat floor installation along with an explanation of why things went wrong and how to avoid these errors. Radiant heating system design or installation mistakes that must be avoided. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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