InvisiWeld™ System

InvisiWeld™ System

Non-Penetrating and VOC-free

invisiweld-installThe UltraPly™ TPO InvisiWeld™ system is a non-penetrating mechanically fastening solution that greatly reduces installation time while increasing wind uplift resistance of the Firestone UltraPly™ TPO membrane. This VOC-free system features TPO-coated InvisiWeld™ Plates that are attached to the UltraPly TPO membrane using an induction welding tool.

Extend The Roofing Season

The roofing season can be extended since the InvisiWeld™ System functions well in many climates, including extremely cold environments where adhesives and asphalt are difficult to use. The TPO InvisiWeld™ System eliminates seam plates and fasteners, reducing installation time and cutting labor costs. End result: an efficient and effective roofing system with no membrane penetrations.

Features and Benefits


InvisiWeld™ plates are welded on the underside of the TPO membrane.

Improved aesthetics over traditional mechanically attached TPO.

InvisiWeld™ systems can be easily installed in cold conditions.


The InvisiWeld™ system typically requires 25% to 50% fewer fasteners compared to conventional mechanically attached TPO systems.

The InvisiWeld™ system provides a more balanced wind load distribution across the roof.

Significantly reduces noise from roof flutter.

Quick And Easy Installation Method:Invisiweld---Toronto

1. Fasten Firestone UltraPly™ TPO InvisiWeld™ Plates to Firestone approved insulation boards in a grid pattern with Firestone All Purpose or Heavy-Duty fasteners.

2. Place UltraPly™ TPO membrane over the grid of InvisiWeld™ plates.

3. Use induction welding tool to secure each plate to the underside of the TPO membrane – takes just 6 seconds!



File Name Size Download
UT-IW-01A UltraPly TPO InvisiWeld Plate 92 kB
UT-IW-01B UltraPly TPO InvisiWeld S Plate 78 kB
UT-IW-02 UltraPly TPO InvisiWeld Assembly 88 kB
UT-IW-03 UltraPly TPO InvisiWeld Metal Roof Retrofit Assembly 97 kB
UT-IW-04 UltraPly TPO InvisiWeld Metal Roof Retrofit Purlin Fastening Rates 174 kB
UT-IW-05 UltraPly TPO InvisiWeld Metal Roof Retrofit Ridge Detail 90 kB
UT-IW-06 UltraPly TPO InvisiWeld Metal Roof Retrofit Eave Detail 99 kB
UT-IW-07 UltraPly TPO InvisiWeld System Insulation Attachment 290 kB
UT-IW-08 UltraPly TPO InvisiWeld Membrane Repair Over InvisiWeld Plate 140 kB
UT-IW-09 UltraPly TPO InvisiWeld Base Tie In Continuous Flashing Using InvisiWeld Plate 110 kB
UT-IW-10 UltraPly TPO InvisiWeld Base Tie In 2-Piece Flashing Using InvisiWeld Plate 1 MB
File Name Size Download
01 Firestone UltraPly TPO Infographic 3 MB
02 Firestone UltraPly TPO Brochure 2 MB
Earth Rangers Case Study 333 kB
UltraPly TPO InvisiWeld System Sell Sheet – Item 1273 609 kB
File Name Size Download
AG UltraPly TPO InvisiWeld and InvisiWeld-S System Application Guide 373 kB
QS-TPO-227 UltraPly InvisiWeld Various 5-20YR 104 kB
File Name Size Download
AP Sealant – TIS 1305 104 kB
All-Purpose Fasteners – TIS 1001 336 kB
Aluminum Drain Bar – TIS 1206 299 kB
Firestone UltraPly™ TPO InvisiWeld™ Plate – TIS 1111 261 kB
Heavy Duty Fastener – TIS 1002 152 kB
Insulation Fastening Plate – TIS 1106 124 kB
Polymer Fastener – TIS 1006 269 kB
Polymer Fastener Insulation Plate – TIS 1107 125 kB
Pourable Sealer A-10 (Part A & Part B) – TIS 1303 211 kB
Pre-Assembled #12 Fastener and Plate – TIS 1003 155 kB
Pre-Assembled Heavy-Duty Fastener and Insulation Plate – TIS 1004 57 kB
Purlin Fastener Black E-Coated – TIS 1011 227 kB
QuickRoller™ – TIS 1419 533 kB
QuickSeam™ Yellow Safety Strip – TIS 1446 272 kB
Single-Ply QuickPrime™ Primer – TIS 1436 435 kB
TPO 9.5″ QuickSeam™ Flashing – TIS 1434 55 kB
TPO QuickSeam™ Flashing – TIS 1417 99 kB
Termination Bar – TIS 1205 179 kB
UltraPly™ QuickSeam™ Reinforced Perimeter Fastening (RPF) Strip – TIS 1423 430 kB
UltraPly™ QuickSeam™ T-Joint Patches- TIS 1425 68 kB
UltraPly™ TPO 8″ Reinforced Cover Strip – TIS 216 404 kB
UltraPly™ TPO 18″ Curb Flashing – TIS 208 228 kB
UltraPly™ TPO Custom Curb Flashing – TIS 218 510 kB
UltraPly™ TPO Custom Pipe Boots – TIS 217 360 kB
UltraPly™ TPO Cut Edge Sealant – TIS 1306 140 kB
UltraPly™ TPO General Purpose Sealant – TIS 1307 110 kB
UltraPly™ TPO Inside/Outside Corner – TIS 205 267 kB
UltraPly™ TPO Large Pipe Flashing – TIS 204 253 kB
UltraPly™ TPO Penetration Pocket Kit – TIS 206 277 kB
UltraPly™ TPO Reinforced Split Pipe Boot – TIS 219 294 kB
UltraPly™ TPO T-Joint Cover – TIS 203 314 kB
UltraPly™ TPO Universal Pipe Boot – TIS 215 273 kB
UltraPly™ TPO Universal QuickSeam™ Pipe Flashing – TIS 1424 122 kB
UltraPly™ TPO Unsupported Flashing – TIS 202 335 kB
Water Block Seal (S-20) – TIS 1304 228 kB
File Name Size Download
FL 21045-R2 Firestone UltraPly TPO XR Over Modified Bitumen Base Sheet Roof Systems 2 MB
Firestone Building Products – UltraPly™ TPO Code Approval Guide 2 MB
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