slab-homes / Green Building & Sustainable Home Renovation Information & Advice

Slab on grade or a foundation and basement?
Foundation choices

Slab-on-grade vs foundation and crawlspace or basement

Is an insulated slab on grade the best foundation choice? Or is a basement better? Traditionally, home construction often starts with a concrete basement foundation - But is that the best choice?  The first factors to consider when designing the foundation system for a home are lot size and soil conditions. When space ...

Step by step guide for slab-on-grade home construction
Slab on Grade

Slab-on-grade construction: the ecoHOME A to Z Slab building guide

Slab on Grade foundation, detail design; the basics There are many different soil conditions and corresponding slab designs. This page is about how to build a thickened edge concrete slab on grade FPSF footing on soil with a high water table to prevent frost heave, by first installing drainage below the slab.  Related ...

Insulating a Slab on grade for a Passive Solar LEED Home with Rockwool © Ecohome
Insulation and soundproofing

Insulating below slab-on-grade floors

Insulating below slab-on-grade foundations Why insulate under a slab on grade foundation? For comfort, and to save money, that's why! In many areas Building Code has fallen behind common sense on what specification of insulation to use under a slab, It is common to install as little as R5 insulation below slab floors, ...

How to Fasten Cement Board Facing to slab on grade insulation
Slab on Grade

Finishing the exterior of an insulated slab-on-grade floor

WATCH MORE sustainable building VIDEOS Once a decision has been made to choose between a crawlspace or a slab foundation , you need to know how to finish the edge off durably. Typically the exterior edge of a slab on grade is made of EPS foam and can be parged. Having used rigid Rockwool panels meant we needed an addi...

Concrete floors and timber frame as thermal mass
Efficient home design

The pros and cons of thermal mass in buildings

Materials in a home that act as thermal mass are things like concrete, masonry, ceramic tiles, even a large volume of wood like timber frames. All materials inside the insulated building envelope will store and release heat, the more dense they are the more pronounced the effects are.  Intentionally adding greater amou...

Slab-on-grade for Ecohome's upcoming video building guide
Slab on Grade

how to build a slab-on-grade on standard soil

There are many ways to build a slab-on-grade (or frost-protected shallow foundation), the following is a step-by-step walk though of a thickened-edge slab floor we built. XPS or EPS rigid foam is typically used under concrete slab floors, in this case we used mineral fiber insulation. Note: our mineral wool was provide...

Rendering of the Ecohome demonstration house
Efficient home design

Ecohome Demo House: High performance, affordable cost

The guiding principles during the design of Ecohome’s Edelweiss House demonstration home - passive heating and cooling, healthy living space, affordable to build and operate, resilient and flexible design.  The underlying goal of the Edelweiss House was to design and build a modestly-sized but functional home that wou...

Slab-on-grade construction technical guide
Slab on Grade

Slab-on-grade technical guide

Slab-On-Grade Construction - Technical Guide   Deciding to build your home with a slab-on-grade foundation instead of a conventional basement or raised crawlspace foundation can greatly reduce your environmental impact during construction, and has the potential to offer significant financial savings as well. By replaci...

Radiant floor heat in a bathroom
Delivery: radiant, forced-air and decentralized

DIY radiant floor installation

There is some debate in performance building circles, particularly in the Passive House community as to whether or not you can add enough insulation below a concrete floor to eliminate the need for heating it. We have been on the fence about this and leaned to both sides at different times, but it seems we have now fa...

Resilient home construction - Kenogami House of the Year
Efficient home design

"The Most Resilient House in North America"

A resilient home for Sustainability Northern Quebec isn’t a place where one might expect to look for a model of resilience. It’s bone-chilling cold in the winter with 10,450 heating degree days per year (Fahrenheit degree-days, base 65°F); there isn’t all that much sunlight in the winter, and Quebec—let alone northern ...

Understanding sound transmission in homes
Insulation and soundproofing

Understanding sound transmission in buildings

Before embarking on any structural changes, it is most important to understand that the sound isolation between two homes is not determined only by the common wall or floor. All the other parts of the construction - side walls, ceilings, floors under walls - can transmit sound. Flanking sound transmission (see below), ...