See the framing.
Understand the R-value.
Explore foam thickness inside common wood framing. Compare open cell and closed cell using illustrative planning assumptions, then bring better questions to your project conversation.
Foam R-value is one part of the assembly.
The diagrams compare insulation in the cavity. They do not calculate the R-value of the wood, thermal bridging, a whole wall or a complete roof. Product ratings can vary with thickness and test conditions. Available cavity depth alone does not establish a suitable assembly or code compliance.
What to bring to your estimate
Note the measured framing depth, the surfaces to insulate, approximate dimensions, project location and intended schedule. Ask the project professional to verify the selected product, moisture control, protective coverings and applicable local requirements.
Open cell versus closed cell · Planning a quote · New construction
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