ASHRAE Journal - April 2020 - 81

COLUMN BUILDING SCIENCES

system, roof membranes and foundation waterproofing membranes.

Mass/Storage Assemblies
A rainwater control strategy that typically stores and
redistributes penetrating rainwater in water-resistant
FIGURE 14 Drained Window and Door Openings. The bottoms of the openings at

their exterior are unsealed to permit drainage to the exterior.

Interior Air Seal

Adhesive-Backed Sill
Flashing

Backdam
House Wrap
Sheathing

building materials until it can be released to either the
exterior or interior in the vapor form in a controlled
manner that does not damage interior or exterior finishes. Mass/storage assemblies are often used with
water-resistant materials such as masonry, concrete,
multi-wythe brick and stone.

Water Control Layer
A sheet, spray or trowel-applied membrane or material layer that controls the passage of liquid water. Water
control layers are interconnected with flashings, window and door openings, windows and doors, and other
penetrations of the building enclosure.
OK, I feel better. A massive barrier in my perspective
has been addressed by sheltering my feelings.

Bibliography

A Strip of Wood Nailed at the Back of the Rough Opening Sill Forms a Dam to
Prevent Water from Draining Into the Interior

Adhesive-Backed Sill
Flashing

Straube, J.F. 2012. High Performance Building
Enclosures, Building Science Press. Westford,
MA, ISBN: 978-0-9837953-9-1, Second
Edition.

https://bit.ly/2T2iToK
Rate This Column

Interior Air Seal

Beveled Wood Siding
House Wrap
Sheathing
A Piece of Wood Bevel Siding Nailed Over the Sill to Create Positive Drainage
Toward the Exterior is Even Better. Note That the Rough Opening Needs to Be
Enlarged to Account for This and Tapered Shims in the Opposite Direction of the
Slope May Be Required

Exterior Door

Interior Air Seal

Use Plastic
Shims Under
Door
3/4 in.
Formed "Seat" in
Concrete Slab Acts as
Pan Flashing

Slab-On-Grade

Forming a Depression in a Cast-In-Place Floor Slab Creates a Built-In Drainage Pan
For Mulled Entry Doors and Sliders, Which Are Prone to Leakage at Joints

APRI L 2020

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ASHRAE Journal - April 2020

Table of Contents for the Digital Edition of ASHRAE Journal - April 2020

Contents
ASHRAE Journal - April 2020 - Intro
ASHRAE Journal - April 2020 - Cover1
ASHRAE Journal - April 2020 - Cover2
ASHRAE Journal - April 2020 - 1
ASHRAE Journal - April 2020 - Contents
ASHRAE Journal - April 2020 - 3
ASHRAE Journal - April 2020 - 4
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ASHRAE Journal - April 2020 - Cover3
ASHRAE Journal - April 2020 - Cover4
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