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Raised Wood Floor Design & Construction Options Presented by: Bruce Cordova

Raised Wood Floor Design & Construction Options

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Page 1: Raised Wood Floor Design & Construction Options

Raised Wood FloorDesign & Construction

Options

Presented by: Bruce Cordova

Page 2: Raised Wood Floor Design & Construction Options

Innovative Design Alternative

Page 3: Raised Wood Floor Design & Construction Options

NAHB Consumer Preference Study

42% of consumers preferwood framed first floors

25% prefer concrete slabs

Photos show Habitat for Humanityhomes in Gulfport, MS.

Page 4: Raised Wood Floor Design & Construction Options

Raised Floor Benefits

Page 5: Raised Wood Floor Design & Construction Options

Champion Homes

“They choose the raised one…”– Billy Ward

Champion Builders, Port Allen, LAPresident, Baton Rouge HBA

Page 6: Raised Wood Floor Design & Construction Options

Tilson Homes

“Our focus study revealed that homebuyers inTexas believe a RWF is a custom upgrade…a slabhouse gives a production builder feel.”

– Robert Kennedy, Tilson Homes, Houston, TX

Page 7: Raised Wood Floor Design & Construction Options

Raised Wood Floor Benefits

Curb Appeal Comfortable Walking

Surface Classic Style Traditional Neighborhood

Streetscapes Decks & Porches Extend

Living Space Simplified Future Repairs

and Renovations Increased Resale Values “A home should have a top, middle,

and a base.” – Kevin Harris, Architect

Page 8: Raised Wood Floor Design & Construction Options

Numerous Advantages

Simpleinspections

Easy maintenance& improvementsLess

expensiveto repair

than slab

Page 9: Raised Wood Floor Design & Construction Options

Builders RWF Cost Assumptions

“I like raised wood floors, butthey’re $10,000 – $15,000 morethan slab-on-grade.”

– Mike FeiginDesign Tech Homes, Houston, TX

“We only offer raised wood floors because theyare more cost effective than slab-on-grade. It’sthe lowest cost method we can build.”

– Lowell Pinnock, United-Bilt Homes, Houston, TX

Page 10: Raised Wood Floor Design & Construction Options

B.C. Daniels Incorporated

Mobile, ALAPA and CAWSlaunched a cost study tobe conducted by NAHB –Research Center:3 Raised Wood Floors

3 Slab-On-Grade

3 Elevated Slabs

Page 11: Raised Wood Floor Design & Construction Options

The 99K House

Houston, TXwww.the99khouse.com

Page 12: Raised Wood Floor Design & Construction Options
Page 13: Raised Wood Floor Design & Construction Options

Jimmy & Rosalynn Carter Build

Page 14: Raised Wood Floor Design & Construction Options

Cows choose Raised Wood Floors

Page 15: Raised Wood Floor Design & Construction Options

Top 3 Federal Flood DisastersBefore Katrina/Rita

Storm Date Payout ClaimsTS Allison 6/2001 $1.1 billion 30,274

H. Ivan 9/2004 $1 billion 24,440May 8-9 flood 5/1995 $584 million 31,264

Page 16: Raised Wood Floor Design & Construction Options

Katrina/Rita/Ike

Page 17: Raised Wood Floor Design & Construction Options

Hurricane IkeKemah - 2008

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Flood Resistant Construction

In areas prone to flooding, use methods andpractices that minimize flood damage

Page 19: Raised Wood Floor Design & Construction Options

Flood Openings?

Page 20: Raised Wood Floor Design & Construction Options

Elevated, Filled Slab

Page 21: Raised Wood Floor Design & Construction Options

Raised Perimeter StemWall Slab on Compacted Fill

Page 22: Raised Wood Floor Design & Construction Options

Pier-and-Beam Foundations

Page 23: Raised Wood Floor Design & Construction Options

Champion HomesPort Allen, LA

Page 24: Raised Wood Floor Design & Construction Options

Continuous Foundation FootingIncorporating Decorative Lattice

Panels

Page 25: Raised Wood Floor Design & Construction Options

Costs ComparisonSlab $6.60-$7.50

Piers $190 each - $3Lumber with ¾” SIF

2x10 - $1.252x12 - $1.50

Page 26: Raised Wood Floor Design & Construction Options

CostsLabor $.65- $1.00

Fill$80-$100 load

1’-$.752’-$1.503’-$2.25

Page 27: Raised Wood Floor Design & Construction Options

Moisture & Insulation Study

Study in conjunction withLSU, APA, FPL, & SFPA.Insulation types in study:Fiberglass batt

Rigid faced foam board (taped)

Low-density spray foam

Medium-density spray foam

High-density spray foam

Page 28: Raised Wood Floor Design & Construction Options

Motivation

• “What’s the best way to insulate acrawlspace?”

• Many opinions but lack of research• Need for durable, energy-efficient

housing• Moisture control/durability are essential

Page 29: Raised Wood Floor Design & Construction Options

Experimental Houses

• 12 total– 8 in Musicians’ Village– 4 in Baton Rouge

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Insulation Systems

Figure from July/August 2008 Coastal Contractor

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Instrumentation

Page 32: Raised Wood Floor Design & Construction Options

Closed Crawl Space Example

Page 33: Raised Wood Floor Design & Construction Options

Extend Vapor Retarder Up Wall

Page 34: Raised Wood Floor Design & Construction Options

Concrete Slab RepairUnit Costs

Contractor Ext Pier Int Pier DeckRemoval

ConcreteBreakout

MudPumping to2 to 4 in lift

AMontgomery Co.

$225 -$250

$325 - $350 $250 - $350 $35 - $45 $1900

BHarris Co.

$400-600

$650 Varies ~$150per pier

$125

CHarris Co.

$595 $655 NC NC $500 - $800

“Repair of slab-on-grade foundations canbe very expensive.” John Clark, PE

Page 35: Raised Wood Floor Design & Construction Options

Raised Wood Floor Repair Costs

Contractor Est. Cost to Shim Piers for RWF

A $2.35/ft2 with min. of $1200 to $1900

B $125 per pier

C

$3.00/ft2 with min. of $2000.Typical range in Houston reported to be $2.50 to

$3.50/ ft2

“With a raised wood floor, repairs are muchlower since individual piers or beams may beadjusted by direct access.” John Clark, PE

Page 36: Raised Wood Floor Design & Construction Options

Research Expansive Clay Soils (Houston)- Engineered Foundations- Monitor Movement

Raised Wood Floors on ExpansiveSoils Research

Ronny CarrollHomes

Houston, TX

Page 37: Raised Wood Floor Design & Construction Options

www.RaisedFloorLiving.com

Page 38: Raised Wood Floor Design & Construction Options

Thanks for Attending