Amply

Introduction to Manual J load calculations and why they are important

Overview of Manual J

Set the door construction assumptions so door heat losses and gains are accurate

Doors - verify and edit

Set the construction, stud size and material, cavity and board insulation, and exterior finish — and classify each wall as exterior, garage partition, or below grade — so wall heat…

Walls - verify and edit

Manual J is designed to be used only for residential buildings that have three or fewer above-grade stories

Can I use Manual J for commercial buildings?

How design conditions are set automatically and how they can be adjusted per local code requirements

Design conditions - automatic settings and making edits

Special considerations and options for handling fully below-grade or partially below-grade walls as well as "walk-out" basements

Below grade walls - verify and edit

Set the type, frame, assembly, glass, overhang, shading, and foreground reflectance so window heat gain and loss are calculated correctly.

Windows - verify and edit

How to set infiltration load calculations with the tightness or blower door method

Air infiltration - verify and edit

How to model losses and gains for ductwork in unconditioned space

Ducts - verify and edit

Set the construction, attic venting, roof material, and insulation so ceiling heat gain and loss are calculated correctly.

Ceilings - verify and edit

Set the construction type, tightness, wall insulation, floor insulation and finish so floor heat transfer is calculated correctly.

Floors - verify and edit

Learn more about occupant, appliance and plant loads found in the Building Profile

Internal loads - verify and edit

Use a flash light, lighter or laser to quickly verify glass type

How to determine if you have "low-e" or "clear" windows

Learn how we set starting assumptions using the year built and location of a home

Smart starting assumptions for insulation, windows and air leakage

You can view and set window and room orientation

Room and window orientation

Eric Fitz

Matt Lowes

Verify and edit key home construction details for accurate designs

Manual J (Load Calculations)

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