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Elevated with flood vents and no damage Next door Slab on grade damage 4119 & 4123 Grennoch Ln, Houston TX

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Page 1: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Elevated with flood vents and no damage

Next door Slab on grade damage

4119 & 4123 Grennoch Ln, Houston TX

Page 2: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Slab SlabElevated with Flood Vents

Meyerland is a 6,000‐acre community in southwest Houston, Texas, outside of the 610 Loop and inside Beltway 8

Three houses right next to each other 

Page 3: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

As slab on grade homes are phased out of subsidized rates actuarial rates translate into a $12,000+ annual premium. 

Elevated with 2’ of freeboard: $618  

Page 4: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

1358 Reviews / Total Customer Premium Reductions = $2,695,493.0030% of our reviewed cases can pay lower premiums with reasonable mitigation.The Reasonable Mitigation Cases saved $829,339.00 this year.

FEMA Good Case:   This is a simple combination of the sections below:LOMA: Structure is eligible to apply for a LOMA with FEMA and be placed into the X Zone.Flood Vents:    These are structures where the addition of compliant Flood Vents and less than 1’ of fill/LAG change, will lower flood premiums.Not EC Rated: Policy in force does not use the existing Elevation Certificate for rating, which would reflect a lower premium.  As well as other misratings.Grandfather: Structures that are compliant, are eligible for Grandfathering to flood map enforced at time of construction.

Top Errors on Policies (Misratings) :•  Residency status incorrect (Primary/Non‐Primary)•  Pre‐FIRM structures not rated off EC, when it would be more beneficial to the owner.•  Floor Elevation difference is misrated (compared to BFE)•  Some cases are eligible for LOMA’s and still have high policies.  Agents don’t catch this info.

409 30%179 13%140 10%79 6%11 1%151 11%100 7%252 19%78 6%193 14%52 4%123 9%1358 100%

NOT EC Rated (Misrated)

FEMA Good CaseLOMA

Flood Vents & Less 1ft Fill

Quote Only (NO EC )

GrandfatheringLIFT 

Over 1 ft Fill RequiredLoading Factor

Remove Part of StructureCompliant

Private Ins saves $

Page 5: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

State of Flood Insurance

• 2017 Average Increase 6.3%, Pre‐Firm non‐primary 24%• Reauthorization extension Dec 8 (Proposed Changes)

• Potential repeal of HFIAA Surcharges• Increased Cost of Compliance $100,000 • NFIP redirect interest payments towards mapping• Clarification that private policies meet the mandatory purchase requirements• Potential limitation on written private policies• Increase coverage limits, $250,000 to $500,000 residential• Commercial, multi‐family $500,000 to $1,000,000 • CAP on WYO compensation to 25% 

Page 6: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Brand New construction 4927 Dumfries HoustonMeyerland

From architect David DiPuma: “Well as you are aware we encountered flooding in Meyerland and the house I installed the vents at got 42" of water. The flood vents worked great.”

Page 7: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood
Page 8: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood
Page 9: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood
Page 10: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Air Vent used in Meyerland home and clogged with debris 

City of Houston flood ordinance references FEMA Technical Bulletins from 1993 

Building code crossed out all IRC and IBC references to ASCE 24!

Page 11: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Hurricane Matthew flooding in Lumberton, NC

Page 12: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood
Page 13: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Recent   F.R.E. Success Story – St George Island, FL

• Pre-FIRM structure.• 274 square foot enclosure without

compliant flood venting.• Enclosure floor is 4 feet below the BFE.• Installing compliant flood venting will

raise the lowest rated floor for flood insurance to the living floor, 5 feet above the BFE.

Page 14: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

• Compliant flood venting installed into 2 different walls of the enclosure, and no higher than 12” from ground/floor level will result in a drastic reduction in the flood insurance for this structure.

Recent   F.R.E. Success Story – St George Island, FL

Page 15: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Mitigating the WagnersPeoria, IL

Illinois River

Page 16: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

BFE 460’

NFIP Rates At The Bottom Floor 450.93’ (‐9) Rating 

Actuarial Rates would show the premium to be $6,000+

Page 17: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

(5) Engineered Openings Needed

Flood Vents Installed | September 2014 

e.g. Smart Vent

Page 18: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

2 different walls Within 12” of adjacent grade

Page 19: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

New Premium 

Old Premium: $2,038

New Premium: $51175% Reduction

Retrofit Cost: $1,200

Page 20: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Happy Residents 

That’s a refund check

Page 21: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Not the End of the StoryJune 17th, 2015  

“Along with the yearly insurance savings our mortgage payment has drop as well so we really did save a lot of money by installing the Smart Vents. If you have not heard the Illinois River is flooding and we are prepared because of YOU. I am attaching a picture of the Smart Vents in action”.

Rob Wagner

Page 22: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Go Time…..

Page 23: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Look at the Debris….Flood Openings on this wall were activated from the inside out . Water flowed from the north to the south

Page 24: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

After the water receded Still Standing 

Page 25: Elevated with flood vents Next door Slab on grade and no ...Flash.org/ndrc17/TomLittle.pdfNext door Slab on grade damage 4119 & 4123 GrennochLn, Houston TX. Slab Elevated with Flood

Lessons Learned

• Slab on grade just a bad idea, raised floor foundation are cool• Freeboard works• Engineered Flood Vents perform as advertised• Owners will mitigate on their own dime