Carlisle Coatings & Waterproofing

Owner:

Toyota Motor Company

Architect:

Corgan

Scope Of Work

Toyota Headquarters Proves Excavation is Final Authority

for Waterproofi

ng Solutions

Bentonite clay is the go-to waterproofi ng solution for most below-grade slab applications in

drought-prone Texas, where much of the land is above the water table. That was the original

recommendation of design professionals who consulted on the new, state-of-the-art $350 million

North American headquarters for Toyota Motor Company.

As expected, the 100-acre site located in Plano, Texas, was initially above the water table. But once

below-grade excavation began on the 298,000 square foot site that would eventually comprise

a basement and occupied space, contractors had second thoughts. The excavation hit limestone

bedrock sitting below the water table. That, along with unusual spring deluges, caused the owner,

consultant and general contractor to reco

nsider the bentonite recommendation.

“In Texas, we don’t always waterproof under slab, because we’re typically above the water table,”

said Chuck Jahant, Vice President South Central Region at Alpha Insulation & Waterproofi ng. “We

were not in the water table on this job, but once they dug the hole, the owner and consultant saw

that there was enough water along the limestone rock that they wanted to waterproof not only the

hole, but also under the fl oor slab.”

Alpha was asked to recommend a solution – a pre-applied sheet waterproofi ng membrane. “There

was a lot of square feet to waterproof, and these large areas would be left exposed before pours,”

Jahant said. “If the bentonite got wet or went under water we would have to deal with the issues of

it pre-activating before the pour. To us, that was a lot of unnecessary risk and potential additional money

spent if we had to make repairs. It would just become a bad situation for all involved.”

Jobsite visits by the owner, consultant, and general contractor convinced the team that a sheet-applied,

below-grade membrane, combined with hot rubber on the decks, would be the best waterproofi ng solution.

To simplify the process, stakeholders wanted one manufacturer system with a 20-year warranty. Because

of past experience using the Carlisle Coatings & Waterproofi ng (CCW) MiraPLY system and CCW-500R

at Dallas Love Field, Alpha recommended using CCW products. After considering other options, decision

makers eventually chose the CCW system.

“This was a fast track project and it was very important to the owner, general contractor and consultant

that the manufacturer be involved and available for

project technical support,” Jahant said. “While all

manufacturers have local representatives, CCW had a plant close-by in Wylie. That was important to

the owner.”

About the same time as product negotiations were going on, CCW launched MiraPLY-H with SeamLOCK

™

Technology.

MiraPLY-H with SeamLOCK

™

Technology is a self-adhering, dual membrane waterproofi ng system that

fuses the time-tested waterproofi ng qualities of TPO an

d the self-sealing properties of butyl alloy adhesive.

It is a fully-bonded 70-mil system that features a 45-mil thick, reinforced TPO sheet laminated to a 25-mil

butyl adhesive coating. Its unique laminated construction creates a one-step compression seal gasket that

combats shifting and soil separation from foundation walls and substrates.

Jahant said the Toyota job was one of the fi rst to use the new

system and his crew can attest to the fact that it is tough and

durable. The membrane went down easily over class 57 gravel

without puncturing.

Seam adhesion was better also.

“Our guys thought adhesion was greatly enhanced and the

membrane went down much faster,” Jahant said. “It defi nitely

has an aggressive bond at the laps. There was an area where the

concrete workers had a problem with the pour and had to remove

a section of the fl oor slab. Typically you don’t see under the slab

once it’s installed. But we had to cut out an area

to fi x it. We could see the product was well-bonded to

underside of the slab. That was impressive.”

(See top right photo)

HDPE-based sheet applied membranes were once the better mousetrap, Jahant said. That’s not

necessarily the case since CCW introduced MiraPLY-H with SeamLOCK

™

Technology.

“Our guys like the more fl exible membrane,” Jahant said. “It’s easier to maneuver and work with because

it’s not as stiff.”

Jahant said one of the most remarkable things about the project was CCW’s on-site presence.

“CCW had people keeping an eye on things, making sure our installation went smoothly,” he said. “That

was important to the owner and to us. We were always impressed with the reactive and timely tech service

team. Not all manufacturers can provide the level of service that CCW does.”

08.31.16 © 2016 Carlisle.

Carlisle and SeamLOCK are trademarks of Carlisle.

SCIENCE. SERVICE. SOLUTIONS.

Carlisle Coatings & Waterproofi

ng

Canada:

2100 Remembrance

Road

|

Lachine, QC HBS 1x3

|

800.544.5535

USA:

900 Hensley Lane

| Wylie, TX 75098

|800.527.7092

|

www.carlisleccw.com

PROJECT PROFILE

Toyota Headquarters – Plano, Texas

HDPE-based sheet applied

membranes were once the

better mousetrap, Jahant

said. That’s not necessarily

the case since CCW

introduced MiraPLY-H with

SeamLOCK

™

Technology.