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Understanding Roof Construction Layers

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What happens here

The demonstrator presents a roof section mock-up, explaining its typical construction. He highlights a 2x6 rafter, noting that rafters usually run from the ridge down to the bearing wall and can be larger, while trusses might use smaller 2x4 lumber. He then disassembles a small section to reveal the layers: oriented strand board (OSB) sheathing, a layer of synthetic felt underlayment, and asphalt shingles. He also notes that roofs can sometimes have two or three layers of shingles.

Goal: Identify and explain the typical components of a roof structure

Tools and materials

  • 2x4 Truss Sample — To illustrate a common truss size
  • 2x6 Rafter Sample — To illustrate typical roof framing lumber
  • Asphalt Shingles — Representing the finished roofing material
  • Oriented Strand Board — Representing the roof sheathing layer
  • Roof Section Mock-up Custom Built — To demonstrate roof components and layers
  • Synthetic Felt Underlayment — Representing the water-resistant barrier

What they say

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your stack and into higher floors without being recognized. Here's an example of a roof with OSB. Rafters will typically run from the top of the ridge all the way down to the bottom of the bearing wall. Rafters are often 2 by 6s or bigger, but if it's a truss, it could be as small as a 2 by 4. A roof will typically have OSB, a layer of synthetic felt, and a layer of shingles. In some cases, you might even have two or three layers of shingles. It's not uncommon for synthetic felt to get clogged in the chainsaw. When you make your cuts up

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