• Get started
  • Sign In
  • EDUCATION HUB
      • Online courses
        • For homeowners
        • For professionals
        • Special offers
      • INFORMATION
        • Satisfaction policy
        • Frequently asked questions
  • BUILDING GUIDE
      • ASK THE EXPERTS
        • Planning and Design Questions
        • Foundation and Basement Questions
        • Wall and Roof Questions
        • Mechanical Systems Questions
        • Interior Finishing Questions
        • Exterior Finishing Questions
      • LATEST SUSTAINABILITY NEWS
        • Policy and Building Code News
        • Products and Materials News
        • Design News
        • Climate Change News
        • Renewable Energy News
        • Urban Planning News
        • Energy Efficiency News
        • Transportation News
        • Health and Well-being News
        • Architecture News
        • LEED Certification News
      • Planning and Design
        • Lifestyle, location and commuting
        • Grants and incentives
        • Mortgage financing and taxation
        • Building codes
        • Green building certifications
        • Concept and design
        • Off-grid and Net-Zero Housing
        • Materials and resources
        • Architecture and plan design
        • How to Find Qualified Green Building Professionals
        • Healthy indoor air quality
        • Waste management
        • Real estate
      • Foundations and Basements
        • Excavation
        • Radon in Homes - Mitigation
        • New foundations and slab-on-grade
        • Foundation and basement improvements
        • Waterproofing and drainage
      • Walls and Roofs
        • Wall assemblies - new construction
        • Wall assemblies - renovation
        • Air and vapour barriers
        • Insulation and soundproofing
        • Windows and doors
        • Roof assemblies - new construction
        • Roof assemblies - renovation
        • Roof coverings
        • Exterior cladding
        • Pest control
      • Mechanical systems
        • Heating and cooling
        • Ventilation
        • Plumbing and water heaters
        • Electricity
        • Renewable energy
      • Interiors
        • Walls and ceilings - interior surfaces
        • Flooring and stairs
        • Paints, finishes and natural coatings
        • Doors and trim
        • Kitchens
        • Bathrooms
        • Basement finishing
        • Interior design and furnishing
        • Cleaning and maintenance
        • Recycling and composting
      • Exteriors
        • Decks, porches and gazebos
        • Permeable laneways and patios
        • Landscaping
        • Rainwater Collection & Watering
        • Rainwater harvesting
        • Food production
        • Natural swimming pools and ponds
        • Greenhouses and Sunrooms / Solariums
  • FIND INSPIRATION
      • Project photos
        • Find ideas for sustainable & beautiful home renovations & building green homes
      • Green home projects
        • See sustainable homes that Ecohome has showcased over the last few years
      • Prefab kit eco homes
        • Find Net Zero prefab LEED & Passive House ready kit homes for sale
      • Green homes for sale
        • Sustainable homes for sale, green certified to LEED, Passive House or Zero Net Energy (ZNE)
      • Net Zero Energy Homes - Case Study
        • Showcasing a pilot project of 35 Net Zero Energy Ready homes built in 2021 in a cold climate
  • FIND PROFESSIONALS
  • FIND PRODUCTS
Back to Guides
Categories
  • Planning and Design
  • Foundations and Basements
  • Walls and Roofs
  • Mechanical systems
  • Interiors
  • Exteriors
"Raft slab"

Raft slab / Discussions

  • 1 - 18 of 45 Posts

Can I connect a new slab addition to an existing (engineered) slab on grade?

...slabs (connected or touching) with 1 building on both slabs? There should be no reason that you couldn't attach a new slab on grade foundation to an existing sl...

Posted by Corey Porteous April 9, 2025 Slab on Grade 1 response

What are the best below grade drainage layers for a slab on grade foundation?

...raft slab can be built on any soil that an edge-loaded footing foundation can be built on, but not the other way around. A Raft slab spreads the weight evenly o...

Posted by stephan prystanski April 7, 2025 Slab on Grade 1 response

What's the ideal concrete thickness for concrete slab floors?

...Slab Foundation: This concrete floor is not intended as a structural slab foundation. Should I directly design it as a traditional slab foundation? In this case...

Posted by Abdulkadir Al-Jazari March 28, 2025 Basements

What is the proper way to build a Slab on Grade Foundation?

...Slab on Grade foundation. Reinforced concrete perimeter footings approximately 12" x 40" deep, and a 4" thick concrete slab on top of 2" rigid insulation. This ...

Posted by John Schureman March 25, 2025 Slab on Grade 3 responses

Can I use thermal evacuated tubing with a Legalett radiant air system in a raft slab?

...raft slab as well. Legalett is an independent company, we just feature it here as we do other systems that we like, and so far we have not found any other compa...

Posted by kathryn saunders Jan. 20, 2023 Renewable energy 1 response

How much perimeter skirt insulation should go around a concrete slab?

...slab w/ 2" hard foam insulation under slab (+ crushed stone & eps vapor barrier), and 2" hard foam insulation vertically around sides/edges of slab and subf...

Posted by Insinuendo Insinuendo Aug. 5, 2022 Slab on Grade 3 responses

What are the best practices for a pier foundation on sloped bedrock?

...slab on grade instead, which is more efficient, more valuable, and likely competitively priced compared to a home built on piers if you consider the added insul...

Posted by s w July 12, 2022 New foundations and slab-on-grade 1 response

What is the minimum insulation value for insulation between the edge of the slab and foundation wall?

...slab foundations and homes, I would first check our BC Step Code made easy page for information on that. Building codes vary too much between states, provinces ...

Posted by Arsh Deep July 12, 2022 Slab on Grade 1 response

Can we backfill a basement and then do slab on grade?

...raft slabs, which distribute the weight over the entire surface rather than resting on a footing so soil compression is much less of an issue.  

Posted by susannahandjared mcisaac March 3, 2022 Slab on Grade 1 response

Is an engineered slab on grade as good as a foundation footing?

...slab on grade so that there is no shifting with frost. Is this not the case anymore. Is a slab on grade the best practice? An engineered slab on grade that has ...

Posted by Jeff Ryan Feb. 15, 2022 Foundations and Basements 1 response

What are the pros and cons of building a house on a slab on grade foundation?

...slab still be in tact? What happens if the slab cracks and part of the house tilts? Here you have lots of old houses on basements that are still standing. With ...

Posted by Debra Kroening Jan. 5, 2022 New foundations and slab-on-grade 6 responses

What is the best way to build a slab on grade foundation?

...slab would be the best fit to accomodate any shifting and be the most cost effective but I don't know how I should pour an insulated, above grade slab in respec...

Posted by Earl Williams Nov. 30, 2021 Slab on Grade 3 responses

What is the best way to install slab on grade insulation?

...Slab on grade technical guide We have other pages on slab construction as well that are worth looking at, you can find them if you enter slab on grade in the se...

Posted by paul fowler Aug. 26, 2021 Slab on Grade 3 responses

Can you leave a Legalett slab in winter in Canada without the heat on?

...slab, slabs are their specialty and they’ve been at it for decades. I’d have no concern whatsoever with frost heave, that’s their job.  Important to note - if y...

Posted by Gamog Cladhaire April 29, 2021 Slab on Grade 3 responses

What is the best method of building a slab on grade?

...slabs with different methods, our preferred method on how to build a slab on grade would be with an engineered prefab raft slab kit. The reason we like that sys...

Posted by Jay Law April 19, 2021 Slab on Grade 1 response

Can I use a Legalett slab in Florida if I don't want floor heat?

...slab, or do you have something like this without the heated floors that would work better? A Legalett raft slab has an optional air heated radiant floor, but it...

Posted by Harry Dickinson March 25, 2021 Slab on Grade 1 response

Can you do an update on Ecohome’s new demo house?

...slab, the heated air is diverted to an air/water heat exchanger for heating the hot water tank instead. Is the closed loop system maintained when diverting heat...

Posted by dean c Oct. 16, 2019 Concept and design 1 response

How much insulation should I install underneath my concrete slab in my basement?

...slab is cooler than your slab (which it would be by about 15 degrees Celsius in your case) you will be feeding heat into the ground.  Your basement should be de...

Posted by Scott Antonation Sept. 27, 2019 Slab on Grade 5 responses
  • 1
  • 2
  • 3
  • Next 

Company

  • About Ecohome
  • Become a member
  • Contact Us
  • Terms & Privacy

For professionals

  • Create a free business profile
  • Promote products & services
  • Become a contributor
  • Join discussions as a pro
All rights reserved © 2025 Ecohome NetworkFrançais

An error occurred. Sorry for the inconvenience.

Close