Inspection Training

How to Inspect the Number of Layers on the Roof

While the inspector is at the roof they will want to check for the number of layers that are present on the roof. It can sometimes be difficult to make this determination so pay close attention to the pictures provided in this training post and if you are ever not sure of how many layers a roof has you can send pictures to the group text so other inspector’s can help to identify how many layers are on the roof. Please review the entire procedure below.

ONE LAYER

MULTIPLE LAYERS


NACHI SOP

International Standards of Practice for Performing a General Home Inspection

 

3.1. Roof

 

I. The inspector shall inspect:

N/A

 

II. The inspector shall describe:

N/A

 

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

N/A

 

IV. The inspector is not required to:

N/A

 

Axium SOP Differences

Axium Requires: The inspector should determine the number of layers on the roof.

 

Tools Needed

The inspector might want to use a tape measure to show the thickness of multiple layers and will also be using a ladder to access the roof, as well as the ladder clamp to secure the ladder.

Procedure

  • The inspector should look at the edge of the roof while on the ladder to determine how many layers are on the roof. If the roof has one layer the inspector should take a picture at the edge showing the one layer. If there are multiple layers the inspector should use had or tape measure to show the thickness of multiple layers and pit it in the report as defect. Sometimes there is a double layer of shingles at the first row. Make sure to look at the shingles and determine if they are different or the same age and style shingle. You can also look at the rake edge to help verify. This is to inform the client when the time comes to replace the roof, it will be more expensive because all previous layers need to be removed before new roofing. Plus, there may be too much weight on the roof, especially with an older home that does not have roof trusses.

Common Defects

  • Having two or more layers of roofing materials.

Common Mistakes

  • Not accurately being able to determine the roof has more than one layer.

Report / Software

IN


  • The roof had one layer of roof covering material installed at the time of the inspection.

NI

  • The roof [word 1] at the time of the inspection, and the number of layers could not be identified.
    • Could not be lifted at edge
    • Gutters Covered
    • No Safe Access
    • Rain
    • Snow
    • Too High

NP

  • The roof [word 1] at the time of the inspection, and the number of layers could not be identified.
    • Could not be lifted at edge
    • Gutters Covered
    • No Safe Access
    • Rain
    • Snow
    • Too High

RR

  • The roof had at least two existing layers of composition asphalt shingles installed at the time of the inspection. This condition may exceed the design limits of the roof framing. When new roofing is required, all layers will need to be removed before new roofing material can be installed. This is more expensive than simply adding another layer and you may wish to take this into account in your consideration of this property. You should consult with a qualified roofing contractor to discuss options and costs for replacement as necessary.