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Know the Code - Master the rules of home building


Know the Code

Learn how to build sturdy, safe, code-compliant homes with these insights from building inspector, consultant, and former residential contractor Glenn Mathewson. If a topic is covered in the International Residential Code (IRC), you’re bound to find a clear explanation of it here.

  • Chasing Wind-Load Requirements

    New research has resulted in a better understanding of how wind pressure acts on roofs.

  • Safety Regulations for Irregular Stairs

    Building codes address the hazards of using ship's ladders, alternating tread devices, and more unusual stairs.

  • What the Code Says about Interior Trim and Cabinetry

    Though there are not many codes for trim carpenters to follow, some things require planning and attention in order to pass inspection.

  • The Science of Simple Spans

    How the various code provisions for joist span, blocking, notching, and bearing lengths work together to prevent floors from deflecting.

  • Building Codes for Insulation and HVAC in Attics

    Creating a durable and efficient conditioned attic space for mechanicals requires more than just air-sealing and adding insulation.

  • Rules for Storing Your Own Electricity

    With an increase in the popularity of electric vehicles and solar panels, new building code requirements for safely housing systems to store excess energy have cropped up.

  • Energy Codes as Clear as Glass

    The building codes for windows address both thermal and air transmission—here's what you need to know to select windows using the prescriptive path.

  • Problem-Solving Through Stair Landings

    International Residential Code requirements for intermediate and odd-shaped stair landings.

  • Protecting Foundations from Frost

    Code expert Glenn Mathewson describes code-accepted alternatives to digging below the frost line, with a focus on frost-protected shallow foundations.

  • Glass in Wet Spaces

    Code expert Glenn Mathewson explains the requirements for glazing to protect occupants from injury in slippery locations.

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