GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Soffit roof venting

Detroitcarp96 | Posted in General Questions on

Hi,
I was wondering if there is a formula (Code or otherwise) to determine the width of a continuous soffit needed to vent  a rigid GAF Cobra ridge vent. The number should allow enough air so that it is pushing up toward the ridge. Also, how would I address insects that may get into vents with larger openings without decreasing the air flow.

Thanks a bunch!

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.

Replies

  1. Expert Member
    MALCOLM TAYLOR | | #1

    Matt,

    Each vent product should include a specification that shows the clear vented area it provides. So for instance, a perforated aluminium soffit would show how many sq inches of ventilated area it gives per sq foot.

    You avoid insects gaining entry by using a material with small enough holes that they can't get through. That is accounted for in the clear vented area of the material.

    The amount you are aiming for is governed by code. Here is a link to common requirements:
    https://up.codes/s/roof-ventilation

    1. Detroitcarp96 | | #2

      Thanks Malcom, I will check those when I get started on that project.
      Matt

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |