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A Home Inspection in Nassau NY: Multiple Roof Layers | 4 Things to Consider when adding a roof layer

Today I performed a home inspection in Nassau NY. As I was performing the home inspection, I made note of the roof containing multiple layers. Most roofing contractors in upstate NY and Nassau NY usually are not fans of a "nail over roof". A "nail over" roof is a home inspection term used to describe a roof installed OVER an older roof. Usually, it is an asphalt roof over another asphalt roof. When we are performing a home inspection on a structure that contains 2 layers of roofs, we really want to make sure we have a good look at the shingles, flashing and crawl the attic to check the underlayment/decking. Reason being, we really have to see if there are any adverse effects happening prematurely during the home inspection due to the additional layer of roof.

I found the picture above online. This is not the roof from our Nassau NY home inspection. Although the picture above reflects a multiple layer roof severely distorted, this is not always the case.

Our client was concerned if the roof was going to hold up which is a legit concern when discovering multiple layers of roof. My home inspector trainee and I thoroughly inspected the roof from the outside looking for signs of premature failure such as curling of the shingles, bulging and or bubbling of the shingles and or other abnormalities we could see during the home inspection. Overall, the roof nail over appeared to be about 10 years old, the shingles were secure, even and totally flat. We inspected the flashing around the chimney and skylights, and they appeared to be installed properly, flush and did not appear to be leaking during the home inspection. My home inspector trainee assisted me with inspecting the underlayment. There were no visible signs of staining, wood rot and or mold which would have indicated to us of small previous leaks from the original roof, long term roofing leaks which would have been evident of wood rot and or poor ventilation.