One solution is to apply "sister" joists on either side like in the photo below, but to pass inspection you'll need to show calculations from a structural engineer that verify it's OK. Description from askmehelpdesk.com. I searched for this on bing.com/images

What's Wring With This Picture: Bored Holes in Floor Joists?

Learn about how to sister deck joists over a beam for framing a large deck or adding onto an existing deck.

Learn about how to sister deck joists over a beam for framing a large deck or adding onto an existing deck.

SISTERING. It’s the best part of life. When I’m weak - then I’m strong. Find your sister joists. Be a sister joist. Take two minutes to watch this video my outrageous friends at SALT Project made about Sistering being the best part of life. You'll be happy you did. https://vimeo.com/143054338

Great video about "sistering" The Best Part of Life by Glennon Doyle Melton. One of my very favorite videos.

Good article describing the "load" an attic floor can hold and what you need in order to finish out the attic space for living.

Attic Flooring: Can You Build It?

How to Make Structural Repairs by Sistering Floor Joists

How to Make Structural Repairs by Sistering Floor Joists

How to Reinforce Floors with Sister Joists

How to Reinforce Floors with Sister Joists

Older homes often have some floor or ceiling joists that have been damaged during the life of the structure. Even some newer homes have floors that are under designed.

This article provides step-by-step instructions and pictures on how to make structural repairs by sistering floor joists alongside weak joists. If you have sagging, cracked or twisted joists, which can happen in older houses, this project will provide the extra support the floor needs.

How to Make Structural Repairs by Sistering Floor Joists

This article provides step-by-step instructions and pictures on how to make structural repairs by sistering floor joists alongside weak joists. If you have sagging, cracked or twisted joists, which can happen in older houses, this project will provide the

How to Reinforce Floors with Sister Joists | Hunker

How to Reinforce Floors with Sister Joists

How to Reinforce Floors with Sister Joists | Hunker

How to Repair a Joist With a Sister Board | Home Guides | SF Gate

How to Repair a Joist With a Sister Board

Today's newly constructed floor systems contain joists that are usually a minimum of 2 inches by Older homes, however, sometimes contain smaller-dimension floor joists.

Ventura's Carpentry framing historical 1800's renovation, sistering joists with TGI's (Ibeams) Washington D.C.

Ventura's Carpentry framing historical renovation, sistering joists with TGI's (Ibeams) Washington D.

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