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  How to measure heat movement through a wall
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Basement heat loss (C) Daniel FriedmanBasement Heat Loss Guide
InspectAPedia®  -    

  • Basement heat loss sources: where does heat loss occur in basements
  • What materials to use to minimize basement heat loss
  • Where to install basement or foundation insulation
  • Argument for placing insulation outside the foundation wall
  • Solar Age Magazine Articles on Renewable Energy, Energy Savings, Construction Practices
Our site offers impartial, unbiased advice without conflicts of interest. We will block advertisements which we discover or readers inform us are associated with bad business practices, false-advertising, or junk science. Our contact info is at InspectAPedia.com/appointment.htm.

This article discusses basement heat loss sources, choice of basement insulation materials, best place to install foundation or basement insulation, how to protect exterior foundation insulation from damage. Also included are sources of foundation insulation covering materials. Sketch at page top and accompanying text are reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss.

Readers should see   INSULATION LOCATION for BASEMENT FLOORS and  INSULATION LOCATION for BASEMENT WALLS. Also see ENERGY SAVINGS in BUILDINGS as well as INSULATION LOCATION in BUILDINGS - WHERE TO INSULATE. For added discussion of basement heat loss and foundation insulation, see BASEMENT HEAT LOSS. Finally, readers considering adding insulation inside or outside a basement foundation wall should see POLYSTYRENE FOAM INSULATION as well as BUCKLED FOUNDATIONS due to INSULATION? Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution.

Contact us to suggest text changes and additions and, if you wish, to receive online listing and credit for that contribution.

© Copyright 2010 Daniel Friedman, All Rights Reserved. Information Accuracy & Bias Pledge is at below-left. Use links at the left of each page to navigate this document or to view other topics at this website. Green links show where you are in our document or website.

Article on Reducing Basement Heat Loss in Buildings

"Beat Basement Heat Loss: proven methods and materials make insulating foundation walls easy and effective" - provided in links to the original document (below) and in updated/expanded web article text just below.

This article, provided in complete, updated form below, explains strategies for reducing building heat loss through basement walls and foundations. The article gives details about best practices for insulating building foundation walls in cold climates, suggesting foundation insulating materials, where to place foundation insulation, and how to protect it from damage. Interesting heat loss research is cited showing that insulating the top half of a foundation wall to R-10 will produce about the same heating cost savings as insulating the full wall to R-5 when compared to an uninsulated wall. This detail is significant if you are considering the amount, trouble, and cost of excavating outside of a building to insulate its foundation. The text below paraphrases, quotes-from, updates, and comments an original article, (see links just above) from Solar Age Magazine and written by Steven Bliss.

Beat Basement Heat Loss

Polystyrene foam insulation (C) Daniel FriedmanProven methods and materials make insulating foundation walls easy and cost-effective.

Foundation walls are big heat losers. The R-value of an 8-inch concrete wall plus air films is 1.49, less than for double glazing. And the upper part of the foundation acts like a wick, drawing basement heat to the cold outdoors. In a well-insulated two story home, basement heat loss will account for 15 to 30 percent of the annual heat load. In a single-story structure, the percentage may be higher.

R-10 perimeter insulation from siding to footing (with one foot of exposed foundation) will cut basement heat loss in a heated basement by about 70 percent. Payback periods for perimeter insulation are relatively short, typically ranging from two to six years in a 5000 degree-day climate.

Guide to Choosing Materials for Building Foundation or Basement Insulation

Heated floor slab insulation detail (C) Daniel FriedmanYou should select an insulation material that withstands the below grade (below ground level) environment - the wetting and vapor drive, and the freeze/thaw cycles. If you plan to leave the material directly exposed to the soil (outside the foundation wall), extruded polystyrene such as Dow's Styrofoam™ or U.S. Gypsum's Foamular™ holds up best and retains most of its original R-value.

Other foundation insulating materials can be used, but they should be protected from direct contact with wet soil by plastic or other barriers. In Canada,some builders have reported success with burying fiberglass insulation in a pressure-treated plywood box - but beware - if water leaks into that container the insulation will be ineffective.

Where Should Foundation Insulation be placed: inside or outside the foundation wall? and How Much Foundation Insulation Should be Used?

Several arguments favor exterior versus interior insulation of masonry and concrete basement walls.

First, an exterior job is usually cheaper, since the insulation can be left uncovered (except for above-grade - see TERMITE SHIELDS vs TERMITICIDE). On the building interior, a good fire retarder, such as 5/8-inch drywall, is required over the foam insulating board to prevent a fire and smoke hazard. (See RIGID FOAM USE INDOORS).

Second, if a decent job is done tying the insulation into the building siding, the major air leak at the building sills will be controlled or eliminated.

Third, the thermal mass of the foundation walls remains available to the building interior, for both heating and cooling benefits.

Fourth, exterior building insulation protects the foundation from additional stresses caused by insulating, and also from frost pressure (as the insulation may be compressed by freezing, expanding soils). Deprived of your home's heat, the soil around the foundation will be more prone to frost heaves, particularly damaging to concrete block and stone foundation walls that cannot resist lateral forces. Cracks in the foundation wall may result. (See BUCKLED FOUNDATIONS due to INSULATION?)

Foundation waterproofing (C) Daniel FriedmanFoam insulation on the foundation wall exterior can absorb some of this movement. Backfilling with materials not prone to frost heaves, such as clean granular fill or stone also helps both against frost damage to the foundation wall and also to improve drainage down to the footing drain. Freeze/thaw cycles can also lead to spalling of the exterior surface of a concrete wall insulated on the building interior.

In new construction in cold climates it makes sense to insulate from siding to footing (photo at left, work incomplete, shows improved drainage and foundation waterproofing membrane against the foundation wall, but with an omission of foundation insulation - too bad). You will get the most out of the insulation material by using a greater thickness on the upper half of the foundation wall than on the lower.

In a building foundation insulation retrofit, stick to the upper half or third of the foundation wall - whatever your budget or your arms (for digging) will tolerate. Insulating half-way down the an 8-foot foundation wall to R-10 will achieve almost the same results as insulating the entire foundation wall to R-5 (See Percent Reduction in Heat Loss - chart below) with the same amount of material and a lot less digging. In climates where cooling loads compete with heating, it is best to leave the lower portion of the foundation wall uninsulated to maintain earth coupling.

Basement heat loss chart (C) Steve Bliss Solar Age Daniel FriedmanPercent Reduction in Building Heat Loss with Different Foundation Insulation Schemes

Computer modeling done by Paul H. Shipp, senior engineer at Owens-Corning Technical Center (in the 1980's) showed that insulating the upper half of a foundation wall to R-10 will produce close to the same savings as insulating the full wall to R-5 compared with an uninsulated foundation wall. The simulation was done for a 1193 square foot single-story house in Columbus, OH (5660 annual heating degree days).

Guidelines for Installing Foundation Insulation

Before you excavate and have to work over a trench, you should prepare the joint where the bottom of the exterior wall siding meets the building insulation. Unless the siding will project a good 1/2-inch beyond the finished insulation, you will need to install a metal flashing or (less durable) a wooden drip cap over the top edge of the insulation board.

Aluminum drip edge (sold for door and window head casings) or J-channel will work here if you can find the right size. Otherwise, a sheet-metal contractor or a siding installer with a metal brake can form a simple metal flashing for you. If the bottom edge of the siding forms a fairly straight line, a simple wooden drip cap could be used - made by rabbeting and beveling a length of pressure treated wood or redwood - but beware: we have inspected homes where this method was used and the wood rotted, leaking behind the insulation and into the building as wind-driven rain ran down the building walls.

In any case, the drip edge must be sloped to shed water so so that it does not back up to rot the bottom of the siding or flow behind the insulation. In installations where a metal termite shield is desired, that metal may form dual duty as both a drip edge and termite shield. In Squeeze a healthy bead of caulk behind the flashing to cut infiltration at the sill area. (See the illustration at the top of this page).

If the foundation walls are relatively flat, the insulating foam board panels can be secured with a mastic compatible with the type of foam used. The solvents in some mastic adhesives may dissolve the foam board, so go with the foam board manufacturer's recommendations. We prefer mechanical fastening of all exterior work, even if an adhesive is used for backup. In new concrete construction, use masonry nails with a large (1 1/2-inch) washer (or cast a pressure-treated nailer into the foundation wall).

Special anchors for this application, called Fast'ners®, available from Insul/Crete, work well in any concrete or masonry wall. The Fast'ner is a cross between a galvanized nail and an expansion bolt, and hammers into 1/4-inch holes drilled through the insulation into the foundation. Modern TapCon® fasteners rated for outdoor below-grade use, also with suitable washers, may speed this procedure as well. Use a hammer drill or you'll waste a lot of time and masonry drill bits. Starting a few inches below the siding, nail or screw the insulation 16 inches on center both ways down to the grade line (the top of soil backfill).

Make sure you overlap all building corners - at recesses for doors and windows, and at building corners. Research has shown that heat loss is greatest at building corners where the large mass of adjacent earth acts as a heat sink. You might backfill part way before coating the above-grade portion of the insulating board. When you finish the foundation insulation job, add backfill sloping aggressively (to allow for settlement) away from the building so that water will run away from the structure.

Scandanavian Flared Foundation Insulation Option: An interesting strategy for foundation insulation, borrowed from the Scandinavians, places the insulation vertically down a couple of feet, then out horizontally four to six feet. Because this interrupts the thermal bridge to the ground surface, it works well for both heating and cooling, and eliminates the problems associated with freezing and frost heaves. While this makes sense thermally, it requires a lot of extra digging in a foundation insulation retrofit job, and plenty of care in installation and backfilling (keep the foam boards sloping away from the building). If the insulation moves over time, creating gaps, much of the benefit will be lost.

Guide to Protecting Foundation Insulation

Polystyrene needs to be protected above grade from ultraviolet degradation (sunlight) and from physical damage (weed whackers, lawn mowers, pests). A variety of premixed cement finishes are available for this application. Most use an acrylic or acrylic latex bonding agent (either in the dry mix or added as a liquid); the stronger ones add chopped fiberglass to the cement mixture.

These foundation insulation finish coatings can be applied with a heavy brush or a trowel. Textures can be created, or colors added depending on your taste.

For all of these foundation insulation covering applications, it is advisable to rough up the finish of the insulation board with a wire brush prior to applying the finish. This doesn't take long and will keep the stucco coating from peeling off later. If the foam insulating board on the foundation wall has been exposed to the weather for a while, make sure that you scrape thorough the dust that will have formed on the surface. One type of Dow's Styrofoam foundation insulation has a thin protective film that must be removed before coating the foam insulation with stucco.

While not all of the suppliers recommend it, it's a good idea to beef up all the seams and nail holes with perforated nylon tape (the sticky type used for drywall and plaster). This will minimize movement and cracks in the foundation stucco coating at these joints. A metal or nylon corner bead makes a neat detail at highly-visible outside corners. A thick coat of fiberglass-reinforced mixture should resist an occasional lawn mower bump or minor hammer blow. Minor impact damage to the stucco coating can be easily repaired with left-over material.

For those who don't like to play in the mud, a neutral gray fiberglass sheet product called Insul-Guard™, from Trend Products, is a good alternative to cement coating. An "L" on the top of the sheet hooks over the top of the foam board foundation insulation; the bottom is carried just below grade. Vertical joints can be overlapped or joined with PVC moldings supplied by Trend. In new construction, nail right through the Insul-Guard and insulation board into the middle of the sill plate. Along with the proper adhesives behind foam board foundation insulation and covering, this will hold the assembly with no additional mechanical fastening up to about 20-inches of exposed foundation wall. Trend also makes a 2-inch wide drip cap that is handy in many insulation retrofit jobs.

See POLYSTYRENE FOAM INSULATION for a guide to using this material in below-grade applications. See TERMITE SHIELDS vs TERMITICIDE for a discussion of avoiding insect damage when foam insulating board is used below or at ground level. See WET BASEMENT PREVENTION for other exterior treatments of building foundation walls to combine foundation insulation with basement waterproofing membranes and drainage systems.

Here we include solar energy, solar heating, solar hot water, and related building energy efficiency improvement articles reprinted/adapted/excerpted with permission from Solar Age Magazine - editor Steven Bliss.

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Technical Reviewers & References

Use links just below or at the left of each page to navigate this document or to view other topics at this website. Green links show where you are in our document or website.

AIR CONDITIONING & HEAT PUMP SYSTEMS
BLOWER DOORS & AIR INFILTRATION
ENERGY SAVINGS in BUILDINGS
FIBERGLASS HAZARDS
INTERIORS of BUILDINGS
COMBUSTION GASES & PARTICLE HAZARDS
COMBUSTION PRODUCTS & IAQ
DEFINITION of Heating & Cooling Terms
HEAT LOSS in BUILDINGS
  How to measure heat movement through a wall
  How to measure building insulation
  How leaky is the building
  BASEMENT HEAT LOSS
  ENERGY AUDIT - How to Use a Free One
  ENERGY SAVINGS MAXIMIZE RETURNS ON
  ENERGY SAVINGS PRIORITIES
  PASCAL CALCULATIONS
  RADIANT BARRIERS
  RIGID FOAM USE INDOORS
RADIANT HEAT
RADIANT HEAT Floor Mistakes to Avoid
RADIANT SLAB FLOORING CHOICES
RADIANT SLAB TUBING & FLUID CHOICES
HEAT LOSS INDICATORS
HEAT LOSS PREVENTION PRIORITIES
HEAT LOSS R U & K VALUE CALCULATION
HEAT TAPES, Heat, Insulation prevent Freeze-Up
HEATING SYSTEMS
HEATING COST FUEL & BTU Cost Table
HEATING COST SAVINGS METHODS
HEATING LOSS DIAGNOSIS-BOILERS
HEATING LOSS DIAGNOSIS-FURNACES
HOUSEWRAP AIR & VAPOR BARRIERS
HUMIDITY LEVEL TARGET
INSULATION INSPECTION & IMPROVEMENT
Insulation R-Values & Properties
ASBESTOS: Photo Guide to Materials / Products
Mold Growth Resistance of Foam Insulation
Table of Properties of Insulating Materials
HUMIDITY LEVEL TARGET
HOUSEWRAP AIR & VAPOR BARRIERS
HOUSEWRAP - TYVEK INSTALLATION DETAILS
ICE DAM PREVENTION
MOISTURE, MOLD, ICE DAM LEAKS in ATTICS & ROOFS

  • Solar Age Magazine was the official publication of the American Solar Energy Society. The contemporary solar energy magazine associated with the Society is Solar Today. "Established in 1954, the nonprofit American Solar Energy Society (ASES) is the nation's leading association of solar professionals & advocates. Our mission is to inspire an era of energy innovation and speed the transition to a sustainable energy economy. We advance education, research and policy. Leading for more than 50 years. ASES leads national efforts to increase the use of solar energy, energy efficiency and other sustainable technologies in the U.S. We publish the award-winning SOLAR TODAY magazine, organize and present the ASES National Solar Conference and lead the ASES National Solar Tour – the largest grassroots solar event in the world."
  • Steven Bliss served as editorial director and co-publisher of The Journal of Light Construction for 16 years and previously as building technology editor for Progressive Builder and Solar Age magazines. He worked in the building trades as a carpenter and design/build contractor for more than ten years and holds a masters degree from the Harvard Graduate School of Education. Excerpts from his recent book, Best Practices Guide to Residential Construction, Wiley (November 18, 2005) ISBN-10: 0471648361, ISBN-13: 978-0471648369, appear throughout this website, with permission and courtesy of Wiley & Sons. Best Practices Guide is available from the publisher, J. Wiley & Sons, and also at Amazon.com.
    Excerpts with updates and annotations expanding the original Best Practices Guide text can be found in the online review and book summary at BEST CONSTRUCTION PRACTICES GUIDE and also at DECK & PORCH CONSTRUCTION, at INDOOR AIR QUALITY IMPROVEMENT GUIDE, and in other articles found at InspectAPedia.com such as HOUSEWRAP AIR & VAPOR BARRIERS, SOUND CONTROL in BUILDINGS, and other topics.
  • Carson Dunlop, Associates, 120 Carlton Street Suite 407, Toronto ON M5A 4K2Toronto. (416) 964-9415 1-800-268-7070 info@carsondunlop.com. Thanks to Alan Carson and Bob Dunlop, for permission to use illustrations from their publication, The Illustrated Home which illustrates construction details and building components. Carson Dunlop provides home inspection education including the ASHI-adopted Home Inspection Training Program (home study course), publications such as the Home Reference Book, report writing materials including the Horizon report writer, and home inspection services. Alan Carson is a past president of ASHI, the American Society of Home Inspectors.
  • Passive Solar Design Handbook Volume I, the Passive Solar Handbook Introduction to Passive Solar Concepts, in a version used by the U.S. Air Force - online version available at this link and from the USAF also at wbdg.org/ccb/AF/AFH/pshbk_v1.pdf
  • Passive Solar Design Handbook Volume II, the Passive Solar Handbook Comprehensive Planning Guide, in a version used by the U.S. Air Force - online version available at this link and from the USAF also at wbdg.org/ccb/AF/AFH/pshbk_v2.pdf [This is a large PDF file that can take a while to load]
  • Passive Solar Handbook Volume III, the Passive Solar Handbook Programming Guide, in a version used by the U.S. Air Force - online version available at this link and from the USAF also at wbdg.org/ccb/AF/AFH/pshbk_v3.pdf
  • The Passive Solar Design and Construction Handbook, Steven Winter Associates (Author), Michael J. Crosbie (Editor), Wiley & Sons, ISBN 978-047118382 or 0471183083 is available at Amazon.com and via the The Passive Solar Design and Construction Handbook, Steven Winter Associates (Author), Michael J. Crosbie (Editor), Wiley & Sons, ISBN 978-047118382 or 0471183083 is available at Amazon.com and via the InspectAPedia Bookstore
  • "Passive Solar Home Design", U.S. Department of Energy, describes using a home's windows, walls, and floors to collect and store solar energy for winter heating and also rejecting solar heat in warm weather.

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