Exterior Waterproofing and Crawlspace Encapsulation

“Waterproof”

Webster Dictionary:

Impervious to water, covered or treated with a material to prevent permeation by water.

The Theory

Components of waterproofing:

• Waterproofing membrane

• Footing drain line

• Daylight drain line

• Gravel backfill

• Proper grading

“Common Practice”

• Waterproofing Membrane

• Footing Drain Line

• Gravel

• Grading

“Common Practice”

• Prevents water from

reaching footing drain line

Soil and Gravel Backfill Ratio

Skewed

• Tennessee’s common soil

classification, lean and fat

clay

“Common Practice”

• Soil is allowed to penetrate

corrugated pipe

• Can cause lateral pressure,

possibly resulting in

bowing basement walls

Practical Application

• Backfill Foundation 80%

with #67 stone

• Excavate

• Seal exterior face and top

of footing

• Protection board

• Clean

• Patch

• Footing drain line

• Backfill remainder with soil

and grade

Practical Application

Practical Application

Practical Application

Practical Application

Practical Application

Practical Application

Practical Application

Practical Application

Crawlspace Encapsulation

Reasons to consider:

• Tennessee’s humidity can create moisture problems

• 50% of air in homes comes up from the crawlspace

• Mold and fungus growth

• Musty odors

• Usable storage area

Crawlspace Encapsulation

Crawlspace Encapsulation

Crawlspace Encapsulation

Crawlspace Encapsulation

Questions