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Air Barrier Types
How Does Moisture Travel?
Water piggybacks on air - when air moves, so does moisture. Air movement accounts for 70-90 percent of moisture vapor transport, making it the primary driver of moisture movement.
Permeable Vapor Retarders Classification
| Vapor Retarder Classification | |
| Class 1 | Less than 0.1, considered a vapor barrier |
| Class 2 | A perm between 0.1 and 1, considered a vapor barrier |
| Class 3 | A perm between 1 and 10, considered a semi-permeable vapor retarder |
| "Permeable Vapor Retarder" | A perm rating greater than 10 to XX |
| Vapor Open | A perm rating greater than "XX" |
More Gaps = More Moisture Transported into Roof Assembly
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| Without a dedicated air barrier membrane staggered ISO will never form a continuous air barrier. This approach will let in 7.5 gallons of moisture through a 1” square hole per year due to joints and gaps throughout the system. | In a 10,000 sq.ft. roof those gaps would allow 1,172 gallons of condensation in the roofing envelope assembly, resulting in damp roofing components, unable to dry out. | |
Reduce moisture transfer up to 90 percent
Using SlopeShield Plus SA as your continuous air barrier reduces moisture to approximately 0.075 gallons per year.
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| SlopeShield Plus SA is a continuous air barrier solving the transfer of air and moisture by upwards of 90 percent. | With a 10,000 sq.ft. roof, the HVAC system quickly absorbs the minimal moisture, preventing it from remaining in the roofing envelope assembly. |
The SlopeShield Plus SA Difference
Controlling Moisture, Blocking Air, Improving Performance
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Benefits
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Learn More About SlopeShield Plus SA for Your Application
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Leadax Original Flashing Installation Instructions
Overview
- Leadax Original Flashing is installed and formed in a similar way to traditional lead flashing.
- Use your hands to pre-form Leadax Original flashing and the Leadax Dresser or Steel Pressure Roller to mold it into place.
- Temperature changes have little or no effect on the expansion or contraction of the product.
Roofing Materials
- Leadax Original flashing is suitable with all types of roofing materials (EPDM, bitumen, plastics and metals), only use Leadax High-Tack Sealant for fixation (not hot air)
- Leadax Original flashing can be used on all lead code 5 applications.
- For flat and low-slope roofs, seal edges and seams with Leadax High-Tack Sealant.
Preparation
- The ideal installation temperature is from 41°F (5 °C) and rising. Leadax Original flashing can be installed in temperatures as low as -4°F (-20°C), however forming Leadax Original flashing could be more difficult and require additional time.
- Ensure surface is dry and free of grease and dust before applying Leadax Original flashing.
Installation
- Installs up to 19.7ft (6m) without needing an overlap.
- Overlaps must be a minimum of 3.1” (80mm) and sealed with hot air or Leadax High-Tack Sealant.
- The recommended welding temperature is 800°F (425°C), depending on the ambient temperature. Use the Leadax steel pressure roller to press down the welding seam.
- In areas frequently exposed to wind, Leadax Original flashing can be secured using Leadax High-Tack Sealant.
- When molded or used as a facing material, it is recommended to secure with Leadax High-Tack Sealant.
- Use Leadax High-Tack Sealant to seal off any edges and seams.
- After application, remove the protective film from the face and reverse.
