Siplast

Contractor Corner

Preparing for Parapro

PMMA has cemented its position as a high-quality detail upgrade to traditional pitch pan and sealants, which had often left room for premature failures. Parapro 123 Flashing can self-terminate on a wide variety of substrates and is eligible for guarantee coverage up to 30 years.*

Preparation is key to adhesion on steel and other metal substrates. Abrade the surface to a bright finish and, to further enhance the bond, qualify and prepare the surface with Rust-Oleum™ High Performance V2100 System Enamel Spray Primer. Refer to the Parapro Roof Membrane Installer's Guide for complete application instructions.

*Contact Siplast for applicable requirements. Refer to Siplast guarantees, available at siplast.com, for complete coverage and restrictions.

Protect your finish ply with Paratread

More than a high-quality walktread for roof areas with high pedestrian traffic, Paratread modified bitumen sheets also provide a protective course in roof areas with mechanical abuse potential. Always install a layer of Paratread between the finish ply and mechanical supports, including, but not limited to, rubber and plastic products.

How to monitor Parasolo PVC welds during temperature changes

As ambient temperatures change, so should your robotic hot air welder temperatures and speeds during PVC roofing membrane installation.

Here’s how:

1.	Weld two 18” (457 mm) pieces together and then allow the membrane to cool for at least 10 minutes. Cut 1” (25 mm) wide strips across the welded material. Test the welds by applying pressure to cause the seam to peel apart.

2.	An acceptable weld will fail by exposing the scrim reinforcement. This is called a “film tearing bond” or “FTB”. The film tearing bond will be between 1” (25 mm) and 1.5” (38 mm) wide.

3.	A partial weld will fail by partially separating between the two layers of the membrane.

4.	An unacceptable weld will fail by separating between the two layers of the membrane. This is also known as a “cold weld” or “false weld.”

5.	During cooler temperatures, test welds should be performed in the morning, after any extended break such as lunch, or after significant change in weather (e.g., air temperature, wind speed, cloud cover, etc.).

6.	The same guidelines apply to hand-welding in colder temperature.

7.	This temperature monitoring is in addition to standard QC guidelines:

i.	A partial weld will fail by partially separating between the two layers of the membrane.

ii.	A partial weld will fail by partially separating between the two layers of the membrane.

iii.	An acceptable weld will fail by exposing the scrim reinforcement. This is called a “film tearing bond” or “FTB”. The film tearing bond will be between 1” (25 mm) and 1.5” (38 mm) wide.

For more information on test welds, check out page 28 of the Parasolo PVC Hybrid System Installer’s Guide.

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Paradiene: The heat is on

Rising temperatures can impact the behavior of solvent-based cold adhesives such as Paradiene/PA-311M & PA-311R. To optimize your results, we recommend reviewing the relevant technical bulletin.

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Siplast Guarantees and Overburden Installation

A final inspection of the completed waterproofing membrane and completion of all related punch list items are required prior to installation of the overburden for projects to be eligible for a Siplast Guarantee.

Review Technical Bulletin

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