Slipping: Delaminating / Sliding

Interlocking Metal Panels are coming unclipped and sliding. This is caused by improper fastening. They are designed to be fastened in a specific area, increasing wind resistance and ensuring that both sides of the panel are attached to the roof. Without lifting up every panel and breaking the clips, it’s impossible to tell if the […]

Torn/Cracked/Broken Surface

As a roof expands and contracts the roof system moves. This is a daily occurrence and is associated with Thermal Shock. During movement the metal panels bind against each other. Sometimes a tree branch or flying debris may impact the roof causing damage. 3rd party damage is another issue. As people walk across the roof […]

Roof Recovered

We do not recommend recovering any roof system. Often roofers will advise consumers to simply install wood strips over the existing roof and install the new system on the wood batons as seen on this Sanibel Island roof. This causes trapped moisture and over time the original roof system will “bake”, causing rapid deterioration.

Offset Not Correct

Metal panels are not a waterproofing material. When installed correctly, they do “shed” water. However, if installed on a flat roof, they would allow massive seepage. The way metal panels work is by their overlapping design. As the previous layer is covered by the next it creates a stair step water shed design, disallowing seepage. […]

Improper Number of Fasteners

Metal is designed to be installed using special self-sealing screws. Each metal panel has a designated uplift and manufactures specify exactly how many fasteners per square foot are required. If metal panels are fastened outside the specifications the manufacturer’s warranty is voided and the roof assembly is out of code. This also leaves the roof […]

Improper Fastener Installation

It is important that all fasteners are installed perpendicular to the roof’s surface and driven in at a perfect 90 degree angle. On this Bonita Springs roof are areas where the fasteners were not driven straight in and the fastener heads are lifted slightly. Over time this can and will damage the roof system and […]

Improper Fastener Type

When two different types of metals come in contact a chemical reaction occurs: Electrolysis uses moisture as catalysis at a molecular level to pass ions from one metal to the other. The process causes a deterioration of both metals similar to the effects of rust. Using the wrong type of fasteners causes a real concern […]

Fasteners Uplifting

“High fasteners” are a serious problem. During roof installation it’s easy for installers to forget about proper pressure setting on their screw guns. In most cases too many drills were hooked up to a single electrical line that was not sufficient to drive each fastener fully. At time of installation only the severe “high screws” […]

Flat Tie-In Not Sealed Properly

The junction between your pitch roof and the flat roof is called the “tie-in”. This area is specifically important because there are two different roofing materials joining. A Marcos Island roof shows evidence that the tie-in area is not sealed properly. It is also very important that the two roof systems have the correct flashing […]

Backwater Laps

When installing a roof system it is important to always start at the lowest point and proceed upward toward the roof’s peak. This ensures that each layer of materials overlaps the previous. Even on flat roofs, this principle is important. As water travels, on a pitch or on a flat roof, if two seams are […]

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Van Martin Roofing
1475 West River Rd. Dayton, Ohio 45417


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