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FREDERICK, Colo. — One of the region’s largest home builders is being accused of shoddy construction by the homeowner who says his house is sinking, partly because of Colorado’s historic 2013 floods.

Robert Landry blames Lennar Homes for mold and foundation issues.

“It`s been an absolute nightmare,” said Landry, a veterinarian who moved his family to Frederick in February of 2014.

His house was built in October 2013, one month after Colorado experienced a 1,000-year flood.

Landry says Lennar built the home based on 2006 soil samples and failed to recognize how much wetter and less stable the soil became as a result.

“The foundation should not have been built on this soil, nor was the soil prepared properly,” Landry claimed.

He took FOX31 inside the home where the wood floors have separated so much, quarters can slide between the beams.

Landry said it’s a result of too much moisture leaking into the house from the crawl space where he said humidity levels reach 76 percent instead of the standard 40 percent or less.

“It’s lifting (the wood floors) and our 2-year-old has already cut his foot on the wood,” Landry said.

FOX31 also noticed cracks forming between the kitchen counters and the walls and spots in the basement appear to be early signs of mold.

Landry and his wife decided to abandon the house in early May after spending $20,000 to have the home tested for mold and structural integrity.

“I just can’t have a nine-week-old baby and a 2-year-old little boy staying in a place that has known mold problems,” Kristie Landry said.

Lennar declined an on-camera interview but Vice President of Operations Frank Walker released a statement that read in part: “Dr. Landry and his attorney have raised a number of issues, some of which may be covered by the warranty that Lennar provides to all of its homeowners in Colorado and some of which may not be. Lennar is currently working with two structural engineers on a plan of repair and is attempting to work with Dr. Landry`s attorney regarding the scope and timing of any necessary repairs.”

Landry said Lennar has done nothing but drag its feet. He also blames building officials with the city of Frederick for granting Lennar a certificate of occupancy.

Jason Overholt is the chief building official for Frederick who admits, “We’ve been made aware of issues in that subdivision.”

But Overholt said the Frederick inspectors are not to blame because the city’s standard procedure is to rely on whatever plan a building engineer submits, as long as Lennar does a current soil analysis to complement the 2006 soil study.

“When they dig those foundations, we make sure that they provide us with documentation that the conditions during that dig were consistent with what the soil report indicated,” Overholt said.

“I think it’s an easy way to get their (the city of Frederick) hands clean and to sign off permits and get revenue from these builders,” Landry said.

The Landrys say they want Lennar to buy their home back so they can move on.

The Landrys intended to sue Lennar, but their attorney tells them they will instead have to seek arbitration based on an agreement all homeowners signed when they moved into the subdivision.  An agreement their attorney says stacks the deck in favor of Lennar when it comes to construction disputes.

Meantime, the Landrys continue to pay the mortgage for a house they can no longer live in.

“It’s really sad.  This was to be our forever house, ” Kristie Landry said.