Sunroom Failure

By Robert Robillard on Design

Do It Yourself Nightmare – DIY Nightmare

We recently were hired to address a sun room that had most likely been leaking from the day it was installed.

The sun room failure was due to a faulty design.

Poor Design

The prior homeowner had routed rabbits in large beams and recessed sliding door glass panels into the beams.  He then applied silicone to the panels and covered them with a 1×4 board.

The leaking manifested itself in the outer wall and was not discovered until the floor at the wall was rotting.

The sunroom failure was so bad that mushrooms were growing in the floor bays in the insulation.


The Repair

We removed to rotted flooring, the outer wall and all of the roof beams. the floor was rebuilt with new floor joists and plywood, the walls new 2×4 walls with all new electrical and insulation and the roof was framed with 2×10 rafters and new insulation.

New Design:

The new design was to eliminate any roof glass as the roof pitch was too shallow and two larger roofs drained onto it.   We decided to plywood and shingle the roof tying it into the existing other roofs.

To regain some of the sunlight lost we lined the entire outer wall with new windows and two flanking doors.


The new walls were plastered, the ceiling received a tongue and groove breaded board ceiling and recessed lights.  The floor had new 2-1/4 oak flooring.  windows were trimmed with Victorian 1×4 poplar casing.


Anderson windows were installed with new exterior pvc trim and primed clapboards.

When we were finished a gutter with leaf covering was added to keep water off the building.

Sunroom Failure

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About the author

Robert Robillard

Carpenter / Remodeler / Editor

Rob Robillard is “The Concord Carpenter” Rob is a builder, general contractor, carpenter, woodworker, and editor of Concord Carpenter and ToolBoxBuzz As a General Contractor and carpenter, Rob owns and operates Concord Carpenter LLC. A full-service remodeling and construction company. Rob is a recognized leader in home building best practices and a source for how-to information for building professionals. On this website, Rob covers all aspects of home construction, building science, home improvement, woodworking, remodeling, and some of the best product and tool reviews. Rob is in charge of our Tool and Product Review series - Concord Carpenter Videos where we post all of our tool reviews and video tutorials. Rob approaches remodeling and building construction with a pragmatic and problem-solving approach. He enjoys using his knowledge and experience to help and educate building professionals as well as DIYers on best practices in the construction and remodeling industry. He's a strong advocate for "raising the bar" in the construction trades and promoting the trades to youth. #BeAMentor #Green2Great Craftsmanship, quality, and pride guide his journey on this channel The Concord Carpenter's motto: "Well done is better than well said!" : Read more about Rob

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