Reducing Radon Levels in Existing Homes

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Reducing Radon Levels in Existing Homes:

A Canadian Guide for Professional Contractors

TABLE OF CONTENTS

 

Chapter 1 – An Overview of Radon

1.1 What is Radon?

1.2 Why is it a Health Hazard?

1.3 Radon Guideline

 

Chapter 2 – Confirming the Radon Test was Carried Out Properly

2.1 Introduction

2.2 Health Canada Testing Guidance

Long-Term Measurements

Short-Term Measurements

 

Chapter 3 – An Overview of Radon Reduction Systems

3.1 How Does Radon Enter a Home?

3.2 Principles of Reducing Radon Entry

3.3 Selection of Mitigation Methods

3.4 Masonry Foundations

3.5 Hollow Concrete Block Foundations

3.6 Poured Concrete Foundations

3.7 Slab-on-Grade Foundations

3.8 Seasonal Effects

3.9 Summary of Mitigation Options

 

Chapter 4 – Mitigation by Sub-Slab Depressurisation

4.1 Introduction

4.2 Feasibility Test

Feasibility Test Example

4.3 System Design

General

Building Pressure Differences

Fan Flow Estimate

Estimate of System Pressure Drops

Summary

Fan Selection

Measurements in other seasons

Sub-slab system installation examples

 

Chapter 5 – Mitigation of Exposed Soil

5.1 Introduction

5.2 Sub-membrane Depressurisation

5.3 Sizing the System Fan for Sub-membrane Depressurization

 

Chapter 6 – Mitigation by Sump and Drainage System Depressurization

6.1 Introduction

6.2 Closing a Sump System

Floor Drains

Sizing the sump system fan

Sub-slab depressurisation and sumps

6.3 Using Perimeter Foundation Drains

Sizing the system fan

Exterior fan installation

 

Chapter 7 – Mitigation by Ventilation Methods

7.1 Introduction

7.2 Exhaust Solutions

7.3 Forced Air Heating

7.4 Supply Solutions

7.5 Heat Recovery Ventilators

7.6 Sizing the Ventilation Fan

7.7 Installation

 

Chapter 8 – Mitigation by Closing Entry Routes

8.1 Background

8.2 Difficulties

8.3 Closing Entry Routes as part of Sub-slab Depressurisation

 

Chapter 9 – Fan and Piping Installation

9.1 Introduction.

9.2 Exhaust discharge location

9.3 Fan Location

9.4 Electrical Installation

9.5 Fan Monitoring

9.6 Piping

9.7 Labeling

9.8 Managing Condensation

 

Chapter 10 – Combining Mitigation Systems

10.1 General

10.2 Block Wall Ventilation

 

Chapter 11 – Building Codes and Radon Mitigation

11.1 General

11.2 Examples

Plumbing Code

Fire Code

 

Chapter 12 – Combustion Appliance Back-drafting

12.1 Carbon Monoxide

12.2 Combustion Appliances

12.3 Testing

12.4 CO detector

 

Chapter 13 – Post Installation Testing

13.1 System Mechanical Checks

13.2 Short term Radon Test

13.3 Long- term Radon Test

Digital Radon Monitors

13.4 Future Radon Testing

 

Chapter 14 – General Safety Precautions

14.1 Health and Safety Plan

Asbestos

Crawlspace/Attic Hazards

Molds

Histoplasmosis

Blastomycosis

Hantavirus

14.2 Radiation Exposure

Additional Reference Material

Glossary