"How to Install TPO Roofing" by RoofRepair101

Summary

The Versa mechanically attached roofing system involves using reinforced membrane sheets in varying thicknesses and widths, depending on wind zone, deck type, and building height. The process includes laying approved insulation with minimal gaps, securing perimeter sheets with specific fasteners, and overlapping field sheets for heat welding. Special attention is given to membrane securement around penetrations and pipe seals, ensuring a watertight and durable roof.

Takeaways

• 🏗️ The Versa mechanically attached roofing system uses reinforced membrane field sheets in thicknesses of 45, 60, 72, or 80 mil.
• 📏 The field sheets come in widths of 8, 10, or 12T depending on wind zone, deck type, and building height.
• 🛠️ Step one involves laying approved insulation with no gaps greater than 1/4 inch and using a minimum of five fasteners and plates per 4x8T board.
• 🔩 For step two, perimeter sheets are secured with a specific number of fasteners, and Versa's HPV X Fastener plates are used.
• 🔄 Overlap the first perimeter sheet by approximately 5 and 1/2 inches when positioning the next sheet.
• 💥 An automatic heat welding machine is used to weld the sheets together for a minimum 1 and 1/2 inch heat-welded splice.
• 📋 In step three, position the Versa weld membrane over the substrate and cut to fit around penetrations using pre-printed X markings.
• 🔗 All required fasteners, including the HPV X Fasteners and plates, are installed for membrane securement.
• 🔄 For field sheets, fastening is typically done at a maximum of 12 inches on center, with this project requiring 12-inch on-center fastening.
• 🔧 Step four involves completing all splices with an automatic heat welding machine and additional securement for certain details.
• 🚧 Specific details like pre-molded and split pipe seals, field fabricated pipe seals, and the Versa weld sealant pocket require a HP VX Fastener Plate.
• 🛑 Round penetrations less than 6 inches in diameter need only four fasteners and plates, while larger pipes require fastening 12 inches away and on center.
• 💦 After cooling, probe the splice area and make necessary repairs, then apply a bead of TPO cut edge sealant to the membrane edge.

Q & A

What is the Versa mechanically attached roofing system?

The Versa mechanically attached roofing system is a roofing system that uses reinforced membrane field sheets with varying thicknesses and widths, depending on factors like wind zone, deck type, and building height.

What are the different thicknesses of reinforced membrane field sheets available in the Versa system?

The reinforced membrane field sheets come in thicknesses of 45, 60, 72, or 80 mil.

What are the widths of the Versa mechanically attached roofing system's field sheets?

The field sheets are available in widths of 8, 10, or 12 feet.

What is the minimum thickness required for the Versa mechanically attached roofing system's insulation?

The insulation used in the Versa system must have a thickness of 1 and 1/2 inches or greater.

How many fasteners and plates are required per 4x8 foot board when using 4x4 foot boards?

A minimum of five fasteners and plates are required per 4x8 foot board when using 4x4 foot boards.

What is the required fastening pattern for the perimeter sheet in the Versa system?

The perimeter sheet should be fastened according to the required number of fasteners for the project, with 12-inch on-center fastening required for the Versa system.

How should the next perimeter sheet be positioned in the Versa system?

The next perimeter sheet should be positioned by overlapping the first perimeter sheet by approximately 5 and 1/2 inches.

What is the minimum heat welded splice required when welding two sheets together in the Versa system?

A minimum of 1 and 1/2 inch heat welded splice is required when welding two sheets together.

What is the maximum distance between fasteners for the field sheets in the Versa system?

The field sheets are typically fastened a maximum of 12 inches on center, with the project requiring 12-inch on-center fastening.

What are the four details that require additional membrane securement in the Versa system?

The four details that require additional membrane securement are the pre-molded and split pipe seal, the field fabricated pipe seal, and the Versa weld sealant pocket.

How should penetrations less than 6 inches in diameter be handled in the Versa system?

Penetrations less than 6 inches in diameter only require four fasteners and plates, with fastening 12 inches away from the penetration and 12 inches on center.

What is the final step in completing the detail after welding the Versa weld reinforced membrane over the plate?

The final step is to pass the plate in all directions, allow the splice area to cool, probe the splice for any necessary repairs, and apply a bead of TPO cut edge sealant to the edge of the membrane.