Inspection Training

How to Inspect the Roof Ventilation

When the inspector is on the roof it is important to make sure that the roof is properly ventilated. There are a number of different ways to ventilate a roof and if it appears that it is insufficient make sure to call it out as a defect in the inspection report. Please review the entire procedure below.

             

NACHI SOP

International Standards of Practice for Performing a General Home Inspection

 

3.1. Roof

 

I. The inspector shall inspect from the ground level or eaves:

D. The vents, flashing, skylights, chimney, and other roof penetrations.

 

II. The inspector shall describe:

N/A

 

III. The inspector shall report as in need of correction:

A. Observe indications of active roof leaks.

 

IV. The inspector is not required to:

A. Walk on any roof surface.
D. Remove snow, ice, debris or other conditions that prohibit the observation of the roof surfaces.

G. Walk on any roof areas that appear, in the inspector’s opinion, to be unsafe.
H. Walk on any roof areas if doing so might, in the inspector’s opinion, cause damage. J. Warranty or certify the roof.

 

Axium SOP Differences

Axium Requires: The inspector should check to make sure the ventilation is sufficient for the property. We are not required to calculate square footage for ventilation but if we just see one vent that would be a defect.

Tools Needed

No tools required to inspect the ventilation.

      

Procedure

  • The inspector should observe the ventilation from ground with binoculars, from ladder, or while walking the roof. If the ventilation is sufficient the inspector should take a representative picture of the vents on the roof.
  • Whether or not a roof needs ventilation really needs to go back to how a house is designed and insulated regardless of roof type. Roof ventilation reduces the overall humidity that accumulates there due to cold air outside and warm air inside. Given that most standard roofs are insulated with insulation on the ceiling of the top floor, this creates a cold air gap between the attic and roof so ventilation is required/recommended. Most flat roofs are insulated at the roof so there is no cold air gap thereby no ventilation is required. However, if it is insulated at the ceiling then ventilation is needed.

Common Defects

  • Not having enough ventilation on the roof.

 

Common Mistakes

  • Not being able to identify ridge venting.
  • Not identifying that the ventilation is insufficient.

 

Report / Software

IN


  • The property appeared to have proper ventilation and roof vents appeared to be installed correctly and in serviceable condition at the time of the inspection.

NI

  • The roof covering [word 1] and the roof ventilation could not be evaluated at time of inspection.
    • Fragile
    • Snow/Ice
    • Too High
    • Too Steep
    • Wet

NP

  • Defect: Roof venting appeared to be insufficient at the time of the inspection. The approximate rule of thumb is 1.5 sq. ft. of vent area for every 300 sq. feet of attic floor. The inspector recommends increasing attic ventilation by installing appropriate roof, gable or soffit vents. A qualified contractor should evaluate and repair as necessary.
  • Not Present: The configuration and design of the roof structure did not include ventilation.

RR

  • Roof venting appeared to be insufficient at the time of the inspection. The approximate rule of thumb is 1.5 sq. ft. of vent area for every 300 sq. feet of attic floor. The inspector recommends increasing attic ventilation by installing appropriate roof, gable or soffit vents. A qualified contractor should evaluate and repair as necessary.