Mass Timber Moisture Management

SlopeShield Plus Self-Adhered is a highly vapor permeable membrane designed to protect mass timber before, during, and after construction


SlopeShield Plus Self-Adhered is designed to protect mass timber floors and decks and remains permanently installed.	WallShield IT provides temporary protection of vulnerable mass timber structural elements such as columns and beams.	PanelShield SA guards walls from damaging moisture intrusion especially through rough openings.

Minimize Moisture, Minimize Risk, Maximize Drying

Wet Mass Timber WebImage 01 Outer portions of mass timber layers may dry disproportionally faster compared to the inner layers which can remain at elevated levels causing cracks, checking, staining, and dimensional changes.Mass timber absorbs and retains significantly more moisture than traditional wood building materials such as 2x’s, plywood or OSB. Hence drying in a traditional manner (wind, heat, fans) will result in surface checks, mold, and watermarks. Builders can avoid this costly damage by using SlopeShield Plus SA—a fully self-adhered high drying capacity sheet membrane—to simultaneously protect and dry the mass timber structure.

Mass Timber Moisture Protection Strategies

SlopeShield Plus SA

SlopeShield Diagram WebImage 01

SlopeShield Plus SA protects mass timber from bulk water intrusion and concurrently dries mass timber through moisture vapor diffusion.

Taped Splines

Generic CLT Diagram WebImage 01

Alternative protection such as taped splines will leak and less durable lower perm sheet goods offer little to no drying capacity resulting in water damage and mold.

Higher Perms for Faster Drying - During (and after) Construction

Do You Want 1400 Gallons of Moisture Left in the Building Envelope?

VS Diffusion

SlopeShield Plus SA Mass Timber Deck Protection

Resists bulk water intrusion
High drying capacity: 30 perms
Permanent installation works in conjunction with acoustical mat and concrete topping slab
Apply in wet or freezing weather
Tough and durable to tools and machinery
Excellent traction, slip resistant
Six-month UV and climate exposure
Monolithically covers seams, splines
Integrates with VaproShield’s wall membranes for post/column and beam protection

WetDeck WebImage 01

SlopeShield Plus SA handles even ponding water, which can be easy swept away during the workday. It monolithically covers seams and splines further protecting the mass timber structure.

Mass Timber Dryable Wall and Roof Protection

	Protect the vulnerable roof and deck with SlopeShield Plus SA and VaproTape. The high drying capacity continuously dries out the inner wood core layers through vapor diffusion.
	Details matter, protect the end grain of the mass timber with a simple “drip edge” created by overhanging SlopeShield Plus SA.
	Rough openings are also “holes” for water to penetrate the structure. Safeguard the walls of the mass timber structure by installing PanelShield SA.
	Beams and columns need to be temporarily protected during construction. WallShield IT, mechanically attached, offers best in class moisture protection, and is easily removed during the next phase of construction.

Fast and easy to install, SlopeShield Plus SA will protect the mass timber structure floor or deck by resisting bulk water infiltration, while simultaneously drying out the inner layers of the mass timber.

PanelShield SA for walls withstands up to 12 months UV/climate exposure plus offers a superb drying capacity of 26 perms for continuous mass timber drying.

B CLT WebImage 01

Durable to foot traffic and heavy equipment, SlopeShield Plus SA can withstand 6 months UV and climate exposure. It evens handles ponding water which can be easily swept away.

End Grain Protection

Water absorption at the end grain (panel edges) is faster than on the horizontal plane of the panel, therefore it is critical to protect the end grain from water absorption.

CLT panel edges absorb water faster than the CLT plane, making end grain protection critical.

C CLT WebImage 01

Protecting the panel edge with SlopeShield Plus SA is simply an extension of the deck installation.

C CLT WebImage 01

SlopeShield Plus SA Handles ponding water, which is easily swept away directly over the drip edge.

Factory Installation: Easy and Practical


Often CLT panels are shipped simply with loose sheets between the panels, offering little to no moisture protection.	SlopeShield Plus SA is easily applied at the factory around the entire panel, offering protection during transport and while being erected.