A supporting beam near the left rear of the house was drilled to run a drain line through it
What we found
At the left rear of the house, a supporting beam — a horizontal structural member that carries the weight of the building above it — had been drilled through to allow a plumbing drain line to pass through it. The drilling was observed in that section of the beam.
Why it happens here
A structural beam is designed to carry load across a span; its strength comes from the full depth and cross-section of the wood. When a hole is drilled through that cross-section, less material is left to do that job. Building standards, including those in the IRC (the International Residential Code, a widely adopted set of construction rules), set strict limits on where holes and notches — cuts or openings made in a beam — may be placed and how large they may be, precisely because penetrations outside those limits reduce how much load the beam can reliably carry.
What it means for you
The drilling was observed; the inspector recorded that it compromises the structural integrity of the beam in that area. Whether the penetration meets code limits, and whether any reinforcement is needed, are questions that require hands-on evaluation by licensed professionals.
What to do
Have the beam evaluated by a qualified structural engineer, who can assess whether the size and placement of the hole fall within acceptable limits and whether any reinforcement is warranted. A licensed plumbing contractor should also review the drain line installation at the same time.
How common is this
Inspectors routinely examine structural members for penetrations like this and report what they find. When a concern is noted, a structural engineer evaluation is a standard next step.
Your agent can help you coordinate the structural engineer and plumbing contractor visits before you move forward.
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