Hurricane Harvey has been downgraded to a tropical storm since dumping two feet of rain or more on parts of Houston, but the catastrophic levels of rainfall will continue throughout the week.

According to The Weather Channel, Tropical Storm Harvey will move off the coast to the Gulf of Mexico before returning to Southeast Texas on Wednesday. Experts estimate that isolated rainfall totals could reach 50 inches.

Many door, window and glass companies in the area are closed until further notice. The Houston-based Lone Star Glass Co. wrote on its Facebook page that its priority is the safety of its employees and their families. The company listed a number to call in emergencies so that customers can be included at the top of their standby list.

“The situation all across Houston is very bad,” says Alicia Dedman, general manager of The Detering Company, a moulding and millwork business in Houston. “Streets and freeways are flooded. The water is receding but we are still getting rain. They are calling for evacuations in a number of neighborhoods but they can’t get out without a boat. We are not open today – it’s not safe to travel. We do not know yet when we will reopen.”

Jennifer Fontana, executive director of the Texas Glass Association, spoke with DWM about the situation.

“Members in the area are unable to communicate. It’s catastrophic down there right now,” says Fontana. “The low-lying areas and the bayou are flooded. It’s too early to assess the damage right now. We won’t know who the storm has impacted or how until the rain lets up and flooding recedes. We’ll have to wait a couple more days until it’s over.”

Dee Lindley, owner of Northwest Glass & Mirror in Houston, tells DWM that the company is still closed.

“We’re under a mandatory evacuation in our area. We’re not sure what to expect as of right now. We’ll have to get back to you once this is all said and done and we can figure out what damage has been done,” she says.

“The phones are ringing, that’s all I can say. I’m sure we’ll be busy,” says Manuel Chavarria, president of Alpha & Omega Sliding & Windows in Corpus Christi, Texas.

According to an early estimate cited by Bloomberg, damages from Harvey may cost as much as $30 billion.

The windows of many homes in the hardest-hit areas were able to withstand the storm thanks to changes to state’s building codes that mandate the use of impact-rated glass in coastal areas.

“My house was built in 2003 and has vinyl windows, fully tempered insulating glass. No breakage or leakage (no shutters) even though it was in the eye of the hurricane,” says Joe Minor, an industry veteran.

The Texas Department of Insurance (TDI) has designated catastrophe areas along the Gulf Coast.  There is a 130-mph wind zone, a 120-mph wind zone and a 110-mph wind zone. Windows for the 130-mph and 120-mph zones require impact testing; the 110-mph zone only needs pressure testing.

On Saturday, Home Depot activated its Disaster Response Command Center at its Store Support Center in Atlanta. The company says its merchandising, operations and supply chain teams are working to continuously move truckloads of product to stores on the Texas coast to help with the rebuilding efforts.

DWM will continue following this story throughout the week.

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